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Hermes SMTP Server) with ESMTPA ID 0f4d83cf88f6912abe79246c392d6ed4; Tue, 10 Sep 2024 18:41:31 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net, apparmor@lists.ubuntu.com, bpf@vger.kernel.org Subject: [PATCH v3 01/13] LSM: Add the lsm_prop data structure. Date: Tue, 10 Sep 2024 11:41:13 -0700 Message-ID: <20240910184125.224651-2-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When more than one security module is exporting data to audit and networking sub-systems a single 32 bit integer is no longer sufficient to represent the data. Add a structure to be used instead. The lsm_prop structure definition is intended to keep the LSM specific information private to the individual security modules. The module specific information is included in a new set of header files under include/lsm. Each security module is allowed to define the information included for its use in the lsm_prop. SELinux includes a u32 secid. Smack includes a pointer into its global label list. The conditional compilation based on feature inclusion is contained in the include/lsm files. Suggested-by: Paul Moore Signed-off-by: Casey Schaufler Cc: apparmor@lists.ubuntu.com Cc: bpf@vger.kernel.org Cc: selinux@vger.kernel.org Cc: linux-security-module@vger.kernel.org --- include/linux/lsm/apparmor.h | 17 +++++++++++++++++ include/linux/lsm/bpf.h | 16 ++++++++++++++++ include/linux/lsm/selinux.h | 16 ++++++++++++++++ include/linux/lsm/smack.h | 17 +++++++++++++++++ include/linux/security.h | 20 ++++++++++++++++++++ 5 files changed, 86 insertions(+) create mode 100644 include/linux/lsm/apparmor.h create mode 100644 include/linux/lsm/bpf.h create mode 100644 include/linux/lsm/selinux.h create mode 100644 include/linux/lsm/smack.h diff --git a/include/linux/lsm/apparmor.h b/include/linux/lsm/apparmor.h new file mode 100644 index 000000000000..612cbfacb072 --- /dev/null +++ b/include/linux/lsm/apparmor.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Linux Security Module interface to other subsystems. + * AppArmor presents single pointer to an aa_label structure. + */ +#ifndef __LINUX_LSM_APPARMOR_H +#define __LINUX_LSM_APPARMOR_H + +struct aa_label; + +struct lsm_prop_apparmor { +#ifdef CONFIG_SECURITY_APPARMOR + struct aa_label *label; +#endif +}; + +#endif /* ! __LINUX_LSM_APPARMOR_H */ diff --git a/include/linux/lsm/bpf.h b/include/linux/lsm/bpf.h new file mode 100644 index 000000000000..8106e206fcef --- /dev/null +++ b/include/linux/lsm/bpf.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Linux Security Module interface to other subsystems. + * BPF may present a single u32 value. + */ +#ifndef __LINUX_LSM_BPF_H +#define __LINUX_LSM_BPF_H +#include + +struct lsm_prop_bpf { +#ifdef CONFIG_BPF_LSM + u32 secid; +#endif +}; + +#endif /* ! __LINUX_LSM_BPF_H */ diff --git a/include/linux/lsm/selinux.h b/include/linux/lsm/selinux.h new file mode 100644 index 000000000000..9455a6b5b910 --- /dev/null +++ b/include/linux/lsm/selinux.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Linux Security Module interface to other subsystems. + * SELinux presents a single u32 value which is known as a secid. + */ +#ifndef __LINUX_LSM_SELINUX_H +#define __LINUX_LSM_SELINUX_H +#include + +struct lsm_prop_selinux { +#ifdef CONFIG_SECURITY_SELINUX + u32 secid; +#endif +}; + +#endif /* ! __LINUX_LSM_SELINUX_H */ diff --git a/include/linux/lsm/smack.h b/include/linux/lsm/smack.h new file mode 100644 index 000000000000..ff730dd7a734 --- /dev/null +++ b/include/linux/lsm/smack.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Linux Security Module interface to other subsystems. + * Smack presents a pointer into the global Smack label list. + */ +#ifndef __LINUX_LSM_SMACK_H +#define __LINUX_LSM_SMACK_H + +struct smack_known; + +struct lsm_prop_smack { +#ifdef CONFIG_SECURITY_SMACK + struct smack_known *skp; +#endif +}; + +#endif /* ! __LINUX_LSM_SMACK_H */ diff --git a/include/linux/security.h b/include/linux/security.h index 1390f1efb4f0..1027c802cc8c 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -34,6 +34,10 @@ #include #include #include +#include +#include +#include +#include =20 struct linux_binprm; struct cred; @@ -140,6 +144,22 @@ enum lockdown_reason { LOCKDOWN_CONFIDENTIALITY_MAX, }; =20 +/* scaffolding */ +struct lsm_prop_scaffold { + u32 secid; 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Hermes SMTP Server) with ESMTPA ID 0f4d83cf88f6912abe79246c392d6ed4; Tue, 10 Sep 2024 18:41:32 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 02/13] LSM: Use lsm_prop in security_audit_rule_match Date: Tue, 10 Sep 2024 11:41:14 -0700 Message-ID: <20240910184125.224651-3-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Change the secid parameter of security_audit_rule_match to a lsm_prop structure pointer. Pass the entry from the lsm_prop structure for the approprite slot to the LSM hook. Change the users of security_audit_rule_match to use the lsm_prop instead of a u32. The scaffolding function lsmprop_init() fills the structure with the value of the old secid, ensuring that it is available to the appropriate module hook. The sources of the secid, security_task_getsecid() and security_inode_getsecid(), will be converted to use the lsm_prop structure later in the series. At that point the use of lsmprop_init() is dropped. Signed-off-by: Casey Schaufler --- include/linux/lsm_hook_defs.h | 3 ++- include/linux/security.h | 7 ++++--- kernel/auditfilter.c | 11 +++++++---- kernel/auditsc.c | 18 ++++++++++++++---- security/apparmor/audit.c | 8 ++++++-- security/apparmor/include/audit.h | 2 +- security/integrity/ima/ima.h | 2 +- security/integrity/ima/ima_policy.c | 11 +++++++---- security/security.c | 7 ++++--- security/selinux/include/audit.h | 4 ++-- security/selinux/ss/services.c | 10 +++++++--- security/smack/smack_lsm.c | 11 ++++++++--- 12 files changed, 63 insertions(+), 31 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 855db460e08b..0cc3c34f5bdf 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -416,7 +416,8 @@ LSM_HOOK(void, LSM_RET_VOID, key_post_create_or_update,= struct key *keyring, LSM_HOOK(int, 0, audit_rule_init, u32 field, u32 op, char *rulestr, void **lsmrule, gfp_t gfp) LSM_HOOK(int, 0, audit_rule_known, struct audit_krule *krule) -LSM_HOOK(int, 0, audit_rule_match, u32 secid, u32 field, u32 op, void *lsm= rule) +LSM_HOOK(int, 0, audit_rule_match, struct lsm_prop *prop, u32 field, u32 o= p, + void *lsmrule) LSM_HOOK(void, LSM_RET_VOID, audit_rule_free, void *lsmrule) #endif /* CONFIG_AUDIT */ =20 diff --git a/include/linux/security.h b/include/linux/security.h index 1027c802cc8c..736fb1f87bf4 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -2071,7 +2071,8 @@ static inline void security_key_post_create_or_update= (struct key *keyring, int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmr= ule, gfp_t gfp); int security_audit_rule_known(struct audit_krule *krule); -int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule); +int security_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, + void *lsmrule); void security_audit_rule_free(void *lsmrule); =20 #else @@ -2087,8 +2088,8 @@ static inline int security_audit_rule_known(struct au= dit_krule *krule) return 0; } =20 -static inline int security_audit_rule_match(u32 secid, u32 field, u32 op, - void *lsmrule) +static inline int security_audit_rule_match(struct lsm_prop *prop, u32 fie= ld, + u32 op, void *lsmrule) { return 0; } diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index d6ef4f4f9cba..5b47571ae4ee 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1339,8 +1339,8 @@ int audit_filter(int msgtype, unsigned int listtype) =20 for (i =3D 0; i < e->rule.field_count; i++) { struct audit_field *f =3D &e->rule.fields[i]; + struct lsm_prop prop =3D { }; pid_t pid; - u32 sid; =20 switch (f->type) { case AUDIT_PID: @@ -1370,9 +1370,12 @@ int audit_filter(int msgtype, unsigned int listtype) case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: if (f->lsm_rule) { - security_current_getsecid_subj(&sid); - result =3D security_audit_rule_match(sid, - f->type, f->op, f->lsm_rule); + /* scaffolding */ + security_current_getsecid_subj( + &prop.scaffold.secid); + result =3D security_audit_rule_match( + &prop, f->type, f->op, + f->lsm_rule); } break; case AUDIT_EXE: diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 6f0d6fb6523f..effb1a7e0405 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -471,6 +471,7 @@ static int audit_filter_rules(struct task_struct *tsk, const struct cred *cred; int i, need_sid =3D 1; u32 sid; + struct lsm_prop prop =3D { }; unsigned int sessionid; =20 if (ctx && rule->prio <=3D ctx->prio) @@ -681,7 +682,10 @@ static int audit_filter_rules(struct task_struct *tsk, security_current_getsecid_subj(&sid); need_sid =3D 0; } - result =3D security_audit_rule_match(sid, f->type, + /* scaffolding */ + prop.scaffold.secid =3D sid; + result =3D security_audit_rule_match(&prop, + f->type, f->op, f->lsm_rule); } @@ -696,15 +700,19 @@ static int audit_filter_rules(struct task_struct *tsk, if (f->lsm_rule) { /* Find files that match */ if (name) { + /* scaffolding */ + prop.scaffold.secid =3D name->osid; result =3D security_audit_rule_match( - name->osid, + &prop, f->type, f->op, f->lsm_rule); } else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { + /* scaffolding */ + prop.scaffold.secid =3D n->osid; if (security_audit_rule_match( - n->osid, + &prop, f->type, f->op, f->lsm_rule)) { @@ -716,7 +724,9 @@ static int audit_filter_rules(struct task_struct *tsk, /* Find ipc objects that match */ if (!ctx || ctx->type !=3D AUDIT_IPC) break; - if (security_audit_rule_match(ctx->ipc.osid, + /* scaffolding */ + prop.scaffold.secid =3D ctx->ipc.osid; + if (security_audit_rule_match(&prop, f->type, f->op, f->lsm_rule)) ++result; diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index 6b5181c668b5..87df6fa2a48d 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -264,13 +264,17 @@ int aa_audit_rule_known(struct audit_krule *rule) return 0; } =20 -int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule) +int aa_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, void *vr= ule) { struct aa_audit_rule *rule =3D vrule; struct aa_label *label; int found =3D 0; =20 - label =3D aa_secid_to_label(sid); + /* scaffolding */ + if (!prop->apparmor.label && prop->scaffold.secid) + label =3D aa_secid_to_label(prop->scaffold.secid); + else + label =3D prop->apparmor.label; =20 if (!label) return -ENOENT; diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/= audit.h index 0c8cc86b417b..e27229349abb 100644 --- a/security/apparmor/include/audit.h +++ b/security/apparmor/include/audit.h @@ -202,6 +202,6 @@ static inline int complain_error(int error) void aa_audit_rule_free(void *vrule); int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule, gfp= _t gfp); int aa_audit_rule_known(struct audit_krule *rule); -int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule); +int aa_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, void *vr= ule); =20 #endif /* __AA_AUDIT_H */ diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index c51e24d24d1e..f17213520c36 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -555,7 +555,7 @@ static inline void ima_filter_rule_free(void *lsmrule) { } =20 -static inline int ima_filter_rule_match(u32 secid, u32 field, u32 op, +static inline int ima_filter_rule_match(struct lsm_prop *prop, u32 field, = u32 op, void *lsmrule) { return -EINVAL; diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/i= ma_policy.c index 09da8e639239..22a62e675ebc 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -635,7 +635,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, return false; for (i =3D 0; i < MAX_LSM_RULES; i++) { int rc =3D 0; - u32 osid; + struct lsm_prop prop =3D { }; =20 if (!lsm_rule->lsm[i].rule) { if (!lsm_rule->lsm[i].args_p) @@ -649,15 +649,18 @@ static bool ima_match_rules(struct ima_rule_entry *ru= le, case LSM_OBJ_USER: case LSM_OBJ_ROLE: case LSM_OBJ_TYPE: - security_inode_getsecid(inode, &osid); - rc =3D ima_filter_rule_match(osid, lsm_rule->lsm[i].type, + /* scaffolding */ + security_inode_getsecid(inode, &prop.scaffold.secid); + rc =3D ima_filter_rule_match(&prop, lsm_rule->lsm[i].type, Audit_equal, lsm_rule->lsm[i].rule); break; case LSM_SUBJ_USER: case LSM_SUBJ_ROLE: case LSM_SUBJ_TYPE: - rc =3D ima_filter_rule_match(secid, lsm_rule->lsm[i].type, + /* scaffolding */ + prop.scaffold.secid =3D secid; + rc =3D ima_filter_rule_match(&prop, lsm_rule->lsm[i].type, Audit_equal, lsm_rule->lsm[i].rule); break; diff --git a/security/security.c b/security/security.c index 8cee5b6c6e6d..e06817ef4304 100644 --- a/security/security.c +++ b/security/security.c @@ -5399,7 +5399,7 @@ void security_audit_rule_free(void *lsmrule) =20 /** * security_audit_rule_match() - Check if a label matches an audit rule - * @secid: security label + * @prop: security label * @field: LSM audit field * @op: matching operator * @lsmrule: audit rule @@ -5410,9 +5410,10 @@ void security_audit_rule_free(void *lsmrule) * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on * failure. */ -int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) +int security_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, + void *lsmrule) { - return call_int_hook(audit_rule_match, secid, field, op, lsmrule); + return call_int_hook(audit_rule_match, prop, field, op, lsmrule); } #endif /* CONFIG_AUDIT */ =20 diff --git a/security/selinux/include/audit.h b/security/selinux/include/au= dit.h index 29c7d4c86f6d..7313c92d479b 100644 --- a/security/selinux/include/audit.h +++ b/security/selinux/include/audit.h @@ -41,7 +41,7 @@ void selinux_audit_rule_free(void *rule); =20 /** * selinux_audit_rule_match - determine if a context ID matches a rule. - * @sid: the context ID to check + * @prop: includes the context ID to check * @field: the field this rule refers to * @op: the operator the rule uses * @rule: pointer to the audit rule to check against @@ -49,7 +49,7 @@ void selinux_audit_rule_free(void *rule); * Returns 1 if the context id matches the rule, 0 if it does not, and * -errno on failure. */ -int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *rule); +int selinux_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, voi= d *rule); =20 /** * selinux_audit_rule_known - check to see if rule contains selinux fields. diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index e33e55384b75..74b1aafda399 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -3633,7 +3633,7 @@ int selinux_audit_rule_known(struct audit_krule *rule) return 0; } =20 -int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule) +int selinux_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, voi= d *vrule) { struct selinux_state *state =3D &selinux_state; struct selinux_policy *policy; @@ -3659,10 +3659,14 @@ int selinux_audit_rule_match(u32 sid, u32 field, u3= 2 op, void *vrule) goto out; } =20 - ctxt =3D sidtab_search(policy->sidtab, sid); + /* scaffolding */ + if (!prop->selinux.secid && prop->scaffold.secid) + prop->selinux.secid =3D prop->scaffold.secid; + + ctxt =3D sidtab_search(policy->sidtab, prop->selinux.secid); if (unlikely(!ctxt)) { WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", - sid); + prop->selinux.secid); match =3D -ENOENT; goto out; } diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 4164699cd4f6..7868268032a3 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -4776,7 +4776,7 @@ static int smack_audit_rule_known(struct audit_krule = *krule) =20 /** * smack_audit_rule_match - Audit given object ? - * @secid: security id for identifying the object to test + * @prop: security id for identifying the object to test * @field: audit rule flags given from user-space * @op: required testing operator * @vrule: smack internal rule presentation @@ -4784,7 +4784,8 @@ static int smack_audit_rule_known(struct audit_krule = *krule) * The core Audit hook. It's used to take the decision of * whether to audit or not to audit a given object. */ -static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrul= e) +static int smack_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, + void *vrule) { struct smack_known *skp; char *rule =3D vrule; @@ -4797,7 +4798,11 @@ static int smack_audit_rule_match(u32 secid, u32 fie= ld, u32 op, void *vrule) if (field !=3D AUDIT_SUBJ_USER && field !=3D AUDIT_OBJ_USER) return 0; =20 - skp =3D smack_from_secid(secid); + /* scaffolding */ + if (!prop->smack.skp && prop->scaffold.secid) + skp =3D smack_from_secid(prop->scaffold.secid); + else + skp =3D prop->smack.skp; =20 /* * No need to do string comparisons. 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Hermes SMTP Server) with ESMTPA ID 0f4d83cf88f6912abe79246c392d6ed4; Tue, 10 Sep 2024 18:41:34 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 03/13] LSM: Add lsmprop_to_secctx hook Date: Tue, 10 Sep 2024 11:41:15 -0700 Message-ID: <20240910184125.224651-4-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a new hook security_lsmprop_to_secctx() and its LSM specific implementations. The LSM specific code will use the lsm_prop element allocated for that module. This allows for the possibility that more than one module may be called upon to translate a secid to a string, as can occur in the audit code. Signed-off-by: Casey Schaufler --- include/linux/lsm_hook_defs.h | 2 ++ include/linux/security.h | 10 +++++++++- security/apparmor/include/secid.h | 2 ++ security/apparmor/lsm.c | 1 + security/apparmor/secid.c | 25 +++++++++++++++++++++++-- security/security.c | 21 +++++++++++++++++++++ security/selinux/hooks.c | 16 ++++++++++++++-- security/selinux/include/audit.h | 3 ++- security/smack/smack_lsm.c | 31 ++++++++++++++++++++++++++----- 9 files changed, 100 insertions(+), 11 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 0cc3c34f5bdf..f53323e52fe1 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -291,6 +291,8 @@ LSM_HOOK(int, -EINVAL, setprocattr, const char *name, v= oid *value, size_t size) LSM_HOOK(int, 0, ismaclabel, const char *name) LSM_HOOK(int, -EOPNOTSUPP, secid_to_secctx, u32 secid, char **secdata, u32 *seclen) +LSM_HOOK(int, -EOPNOTSUPP, lsmprop_to_secctx, struct lsm_prop *prop, + char **secdata, u32 *seclen) LSM_HOOK(int, 0, secctx_to_secid, const char *secdata, u32 seclen, u32 *se= cid) LSM_HOOK(void, LSM_RET_VOID, release_secctx, char *secdata, u32 seclen) LSM_HOOK(void, LSM_RET_VOID, inode_invalidate_secctx, struct inode *inode) diff --git a/include/linux/security.h b/include/linux/security.h index 736fb1f87bf4..1c3768c9cf30 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -520,6 +520,7 @@ int security_setprocattr(int lsmid, const char *name, v= oid *value, size_t size); int security_netlink_send(struct sock *sk, struct sk_buff *skb); int security_ismaclabel(const char *name); int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen); +int security_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, u32 = *seclen); int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid); void security_release_secctx(char *secdata, u32 seclen); void security_inode_invalidate_secctx(struct inode *inode); @@ -1461,7 +1462,14 @@ static inline int security_ismaclabel(const char *na= me) return 0; } =20 -static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 = *seclen) +static inline int security_secid_to_secctx(u32 secid, char **secdata, + u32 *seclen) +{ + return -EOPNOTSUPP; +} + +static inline int security_lsmprop_to_secctx(struct lsm_prop *prop, + char **secdata, u32 *seclen) { return -EOPNOTSUPP; } diff --git a/security/apparmor/include/secid.h b/security/apparmor/include/= secid.h index a912a5d5d04f..cc6d1c9f4a47 100644 --- a/security/apparmor/include/secid.h +++ b/security/apparmor/include/secid.h @@ -26,6 +26,8 @@ extern int apparmor_display_secid_mode; =20 struct aa_label *aa_secid_to_label(u32 secid); int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen); +int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, + u32 *seclen); int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid); void apparmor_release_secctx(char *secdata, u32 seclen); =20 diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 808060f9effb..ad2499bff591 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -1532,6 +1532,7 @@ static struct security_hook_list apparmor_hooks[] __r= o_after_init =3D { #endif =20 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), + LSM_HOOK_INIT(lsmprop_to_secctx, apparmor_lsmprop_to_secctx), LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), =20 diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c index 83d3d1e6d9dc..34610888559f 100644 --- a/security/apparmor/secid.c +++ b/security/apparmor/secid.c @@ -61,10 +61,10 @@ struct aa_label *aa_secid_to_label(u32 secid) return xa_load(&aa_secids, secid); } =20 -int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +static int apparmor_label_to_secctx(struct aa_label *label, char **secdata, + u32 *seclen) { /* TODO: cache secctx and ref count so we don't have to recreate */ - struct aa_label *label =3D aa_secid_to_label(secid); int flags =3D FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT; int len; =20 @@ -90,6 +90,27 @@ int apparmor_secid_to_secctx(u32 secid, char **secdata, = u32 *seclen) return 0; } =20 +int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +{ + struct aa_label *label =3D aa_secid_to_label(secid); + + return apparmor_label_to_secctx(label, secdata, seclen); +} + +int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, + u32 *seclen) +{ + struct aa_label *label; + + /* scaffolding */ + if (!prop->apparmor.label && prop->scaffold.secid) + label =3D aa_secid_to_label(prop->scaffold.secid); + else + label =3D prop->apparmor.label; + + return apparmor_label_to_secctx(label, secdata, seclen); +} + int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) { struct aa_label *label; diff --git a/security/security.c b/security/security.c index e06817ef4304..859b37e51796 100644 --- a/security/security.c +++ b/security/security.c @@ -4192,6 +4192,27 @@ int security_secid_to_secctx(u32 secid, char **secda= ta, u32 *seclen) } EXPORT_SYMBOL(security_secid_to_secctx); =20 +/** + * security_lsmprop_to_secctx() - Convert a lsm_prop to a secctx + * @prop: lsm specific information + * @secdata: secctx + * @seclen: secctx length + * + * Convert a @prop entry to security context. If @secdata is NULL the + * length of the result will be returned in @seclen, but no @secdata + * will be returned. This does mean that the length could change between + * calls to check the length and the next call which actually allocates + * and returns the @secdata. + * + * Return: Return 0 on success, error on failure. + */ +int security_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, + u32 *seclen) +{ + return call_int_hook(lsmprop_to_secctx, prop, secdata, seclen); +} +EXPORT_SYMBOL(security_lsmprop_to_secctx); + /** * security_secctx_to_secid() - Convert a secctx to a secid * @secdata: secctx diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 55c78c318ccd..a2da81d0d5f5 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6610,8 +6610,19 @@ static int selinux_ismaclabel(const char *name) =20 static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) { - return security_sid_to_context(secid, - secdata, seclen); + return security_sid_to_context(secid, secdata, seclen); +} + +static int selinux_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, + u32 *seclen) +{ + u32 secid =3D prop->selinux.secid; + + /* scaffolding */ + if (!secid) + secid =3D prop->scaffold.secid; + + return selinux_secid_to_secctx(secid, secdata, seclen); } =20 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *s= ecid) @@ -7388,6 +7399,7 @@ static struct security_hook_list selinux_hooks[] __ro= _after_init =3D { LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security), LSM_HOOK_INIT(sem_alloc_security, selinux_sem_alloc_security), LSM_HOOK_INIT(secid_to_secctx, selinux_secid_to_secctx), + LSM_HOOK_INIT(lsmprop_to_secctx, selinux_lsmprop_to_secctx), LSM_HOOK_INIT(inode_getsecctx, selinux_inode_getsecctx), LSM_HOOK_INIT(sk_alloc_security, selinux_sk_alloc_security), LSM_HOOK_INIT(tun_dev_alloc_security, selinux_tun_dev_alloc_security), diff --git a/security/selinux/include/audit.h b/security/selinux/include/au= dit.h index 7313c92d479b..a60a3e2635fd 100644 --- a/security/selinux/include/audit.h +++ b/security/selinux/include/audit.h @@ -49,7 +49,8 @@ void selinux_audit_rule_free(void *rule); * Returns 1 if the context id matches the rule, 0 if it does not, and * -errno on failure. */ -int selinux_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, voi= d *rule); +int selinux_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, + void *rule); =20 /** * selinux_audit_rule_known - check to see if rule contains selinux fields. diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 7868268032a3..1f478bb08779 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -4787,7 +4787,7 @@ static int smack_audit_rule_known(struct audit_krule = *krule) static int smack_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, void *vrule) { - struct smack_known *skp; + struct smack_known *skp =3D prop->smack.skp; char *rule =3D vrule; =20 if (unlikely(!rule)) { @@ -4799,10 +4799,8 @@ static int smack_audit_rule_match(struct lsm_prop *p= rop, u32 field, u32 op, return 0; =20 /* scaffolding */ - if (!prop->smack.skp && prop->scaffold.secid) + if (!skp && prop->scaffold.secid) skp =3D smack_from_secid(prop->scaffold.secid); - else - skp =3D prop->smack.skp; =20 /* * No need to do string comparisons. If a match occurs, @@ -4833,7 +4831,6 @@ static int smack_ismaclabel(const char *name) return (strcmp(name, XATTR_SMACK_SUFFIX) =3D=3D 0); } =20 - /** * smack_secid_to_secctx - return the smack label for a secid * @secid: incoming integer @@ -4852,6 +4849,29 @@ static int smack_secid_to_secctx(u32 secid, char **s= ecdata, u32 *seclen) return 0; } =20 +/** + * smack_lsmprop_to_secctx - return the smack label + * @prop: includes incoming Smack data + * @secdata: destination + * @seclen: how long it is + * + * Exists for audit code. + */ +static int smack_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, + u32 *seclen) +{ + struct smack_known *skp =3D prop->smack.skp; + + /* scaffolding */ + if (!skp && prop->scaffold.secid) + skp =3D smack_from_secid(prop->scaffold.secid); + + if (secdata) + *secdata =3D skp->smk_known; + *seclen =3D strlen(skp->smk_known); + return 0; +} + /** * smack_secctx_to_secid - return the secid for a smack label * @secdata: smack label @@ -5208,6 +5228,7 @@ static struct security_hook_list smack_hooks[] __ro_a= fter_init =3D { =20 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), + LSM_HOOK_INIT(lsmprop_to_secctx, smack_lsmprop_to_secctx), LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), --=20 2.46.0 From nobody Sat Nov 30 07:44:08 2024 Received: from sonic305-27.consmr.mail.ne1.yahoo.com (sonic305-27.consmr.mail.ne1.yahoo.com [66.163.185.153]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 441D21A4F16 for ; 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Hermes SMTP Server) with ESMTPA ID bfec55394db9c3ecf7e1196118de0a4c; Tue, 10 Sep 2024 18:43:08 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 04/13] Audit: maintain an lsm_prop in audit_context Date: Tue, 10 Sep 2024 11:41:16 -0700 Message-ID: <20240910184125.224651-5-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace the secid value stored in struct audit_context with a struct lsm_prop. Change the code that uses this value to accommodate the change. security_audit_rule_match() expects a lsm_prop, so existing scaffolding can be removed. A call to security_secid_to_secctx() is changed to security_lsmprop_to_secctx(). The call to security_ipc_getsecid() is scaffolded. A new function lsmprop_is_set() is introduced to identify whether an lsm_prop contains a non-zero value. Signed-off-by: Casey Schaufler --- include/linux/security.h | 24 ++++++++++++++++++++++++ kernel/audit.h | 3 ++- kernel/auditsc.c | 19 ++++++++----------- 3 files changed, 34 insertions(+), 12 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index 1c3768c9cf30..d739a4cf43d3 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -279,6 +279,19 @@ static inline const char *kernel_load_data_id_str(enum= kernel_load_data_id id) =20 #ifdef CONFIG_SECURITY =20 +/** + * lsmprop_is_set - report if there is a value in the lsm_prop + * @prop: Pointer to the exported LSM data + * + * Returns true if there is a value set, false otherwise + */ +static inline bool lsm_prop_is_set(struct lsm_prop *prop) +{ + const struct lsm_prop empty =3D {}; + + return !!memcmp(prop, &empty, sizeof(*prop)); +} + int call_blocking_lsm_notifier(enum lsm_event event, void *data); int register_blocking_lsm_notifier(struct notifier_block *nb); int unregister_blocking_lsm_notifier(struct notifier_block *nb); @@ -532,6 +545,17 @@ int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, u32= *uctx_len, void *val, size_t val_len, u64 id, u64 flags); #else /* CONFIG_SECURITY */ =20 +/** + * lsmprop_is_set - report if there is a value in the lsm_prop + * @prop: Pointer to the exported LSM data + * + * Returns true if there is a value set, false otherwise + */ +static inline bool lsm_prop_is_set(struct lsm_prop *prop) +{ + return false; +} + static inline int call_blocking_lsm_notifier(enum lsm_event event, void *d= ata) { return 0; diff --git a/kernel/audit.h b/kernel/audit.h index a60d2840559e..d14924a887c9 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -11,6 +11,7 @@ =20 #include #include +#include #include #include #include @@ -160,7 +161,7 @@ struct audit_context { kuid_t uid; kgid_t gid; umode_t mode; - u32 osid; + struct lsm_prop oprop; int has_perm; uid_t perm_uid; gid_t perm_gid; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index effb1a7e0405..014d23370384 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -724,9 +724,7 @@ static int audit_filter_rules(struct task_struct *tsk, /* Find ipc objects that match */ if (!ctx || ctx->type !=3D AUDIT_IPC) break; - /* scaffolding */ - prop.scaffold.secid =3D ctx->ipc.osid; - if (security_audit_rule_match(&prop, + if (security_audit_rule_match(&ctx->ipc.oprop, f->type, f->op, f->lsm_rule)) ++result; @@ -1394,19 +1392,17 @@ static void show_special(struct audit_context *cont= ext, int *call_panic) audit_log_format(ab, " a%d=3D%lx", i, context->socketcall.args[i]); break; } - case AUDIT_IPC: { - u32 osid =3D context->ipc.osid; - + case AUDIT_IPC: audit_log_format(ab, "ouid=3D%u ogid=3D%u mode=3D%#ho", from_kuid(&init_user_ns, context->ipc.uid), from_kgid(&init_user_ns, context->ipc.gid), context->ipc.mode); - if (osid) { + if (lsm_prop_is_set(&context->ipc.oprop)) { char *ctx =3D NULL; u32 len; =20 - if (security_secid_to_secctx(osid, &ctx, &len)) { - audit_log_format(ab, " osid=3D%u", osid); + if (security_lsmprop_to_secctx(&context->ipc.oprop, + &ctx, &len)) { *call_panic =3D 1; } else { audit_log_format(ab, " obj=3D%s", ctx); @@ -1426,7 +1422,7 @@ static void show_special(struct audit_context *contex= t, int *call_panic) context->ipc.perm_gid, context->ipc.perm_mode); } - break; } + break; case AUDIT_MQ_OPEN: audit_log_format(ab, "oflag=3D0x%x mode=3D%#ho mq_flags=3D0x%lx mq_maxmsg=3D%ld " @@ -2642,7 +2638,8 @@ void __audit_ipc_obj(struct kern_ipc_perm *ipcp) context->ipc.gid =3D ipcp->gid; context->ipc.mode =3D ipcp->mode; context->ipc.has_perm =3D 0; - security_ipc_getsecid(ipcp, &context->ipc.osid); + /* scaffolding */ + security_ipc_getsecid(ipcp, &context->ipc.oprop.scaffold.secid); context->type =3D AUDIT_IPC; } =20 --=20 2.46.0 From nobody Sat Nov 30 07:44:08 2024 Received: from sonic311-30.consmr.mail.ne1.yahoo.com (sonic311-30.consmr.mail.ne1.yahoo.com [66.163.188.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 96AFF1A4F25 for ; Tue, 10 Sep 2024 18:53:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=66.163.188.211 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725994405; 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Hermes SMTP Server) with ESMTPA ID bfec55394db9c3ecf7e1196118de0a4c; Tue, 10 Sep 2024 18:43:10 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net, audit@vger.kernel.org Subject: [PATCH v3 05/13] LSM: Use lsm_prop in security_ipc_getsecid Date: Tue, 10 Sep 2024 11:41:17 -0700 Message-ID: <20240910184125.224651-6-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There may be more than one LSM that provides IPC data for auditing. Change security_ipc_getsecid() to fill in a lsm_prop structure instead of the u32 secid. Change the name to security_ipc_getlsmprop() to reflect the change. Signed-off-by: Casey Schaufler Cc: audit@vger.kernel.org Cc: linux-security-module@vger.kernel.org Cc: selinux@vger.kernel.org --- include/linux/lsm_hook_defs.h | 4 ++-- include/linux/security.h | 22 +++++++++++++++++----- kernel/auditsc.c | 5 ++--- security/security.c | 14 +++++++------- security/selinux/hooks.c | 9 ++++++--- security/smack/smack_lsm.c | 16 +++++++++------- 6 files changed, 43 insertions(+), 27 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index f53323e52fe1..315bbe1f63fc 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -253,8 +253,8 @@ LSM_HOOK(void, LSM_RET_VOID, task_to_inode, struct task= _struct *p, struct inode *inode) LSM_HOOK(int, 0, userns_create, const struct cred *cred) LSM_HOOK(int, 0, ipc_permission, struct kern_ipc_perm *ipcp, short flag) -LSM_HOOK(void, LSM_RET_VOID, ipc_getsecid, struct kern_ipc_perm *ipcp, - u32 *secid) +LSM_HOOK(void, LSM_RET_VOID, ipc_getlsmprop, struct kern_ipc_perm *ipcp, + struct lsm_prop *prop) LSM_HOOK(int, 0, msg_msg_alloc_security, struct msg_msg *msg) LSM_HOOK(void, LSM_RET_VOID, msg_msg_free_security, struct msg_msg *msg) LSM_HOOK(int, 0, msg_queue_alloc_security, struct kern_ipc_perm *perm) diff --git a/include/linux/security.h b/include/linux/security.h index d739a4cf43d3..c8f020cf2a84 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -277,6 +277,17 @@ static inline const char *kernel_load_data_id_str(enum= kernel_load_data_id id) return kernel_load_data_str[id]; } =20 +/** + * lsmprop_init - initialize a lsm_prop structure + * @prop: Pointer to the data to initialize + * + * Set all secid for all modules to the specified value. + */ +static inline void lsmprop_init(struct lsm_prop *prop) +{ + memset(prop, 0, sizeof(*prop)); +} + #ifdef CONFIG_SECURITY =20 /** @@ -285,7 +296,7 @@ static inline const char *kernel_load_data_id_str(enum = kernel_load_data_id id) * * Returns true if there is a value set, false otherwise */ -static inline bool lsm_prop_is_set(struct lsm_prop *prop) +static inline bool lsmprop_is_set(struct lsm_prop *prop) { const struct lsm_prop empty =3D {}; =20 @@ -500,7 +511,7 @@ int security_task_prctl(int option, unsigned long arg2,= unsigned long arg3, void security_task_to_inode(struct task_struct *p, struct inode *inode); int security_create_user_ns(const struct cred *cred); int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag); -void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid); +void security_ipc_getlsmprop(struct kern_ipc_perm *ipcp, struct lsm_prop *= prop); int security_msg_msg_alloc(struct msg_msg *msg); void security_msg_msg_free(struct msg_msg *msg); int security_msg_queue_alloc(struct kern_ipc_perm *msq); @@ -551,7 +562,7 @@ int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, u32 = *uctx_len, * * Returns true if there is a value set, false otherwise */ -static inline bool lsm_prop_is_set(struct lsm_prop *prop) +static inline bool lsmprop_is_set(struct lsm_prop *prop) { return false; } @@ -1350,9 +1361,10 @@ static inline int security_ipc_permission(struct ker= n_ipc_perm *ipcp, return 0; } =20 -static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *= secid) +static inline void security_ipc_getlsmprop(struct kern_ipc_perm *ipcp, + struct lsm_prop *prop) { - *secid =3D 0; + lsmprop_init(prop); } =20 static inline int security_msg_msg_alloc(struct msg_msg *msg) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 014d23370384..3e051014484c 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1397,7 +1397,7 @@ static void show_special(struct audit_context *contex= t, int *call_panic) from_kuid(&init_user_ns, context->ipc.uid), from_kgid(&init_user_ns, context->ipc.gid), context->ipc.mode); - if (lsm_prop_is_set(&context->ipc.oprop)) { + if (lsmprop_is_set(&context->ipc.oprop)) { char *ctx =3D NULL; u32 len; =20 @@ -2638,8 +2638,7 @@ void __audit_ipc_obj(struct kern_ipc_perm *ipcp) context->ipc.gid =3D ipcp->gid; context->ipc.mode =3D ipcp->mode; context->ipc.has_perm =3D 0; - /* scaffolding */ - security_ipc_getsecid(ipcp, &context->ipc.oprop.scaffold.secid); + security_ipc_getlsmprop(ipcp, &context->ipc.oprop); context->type =3D AUDIT_IPC; } =20 diff --git a/security/security.c b/security/security.c index 859b37e51796..410bf69af427 100644 --- a/security/security.c +++ b/security/security.c @@ -3611,17 +3611,17 @@ int security_ipc_permission(struct kern_ipc_perm *i= pcp, short flag) } =20 /** - * security_ipc_getsecid() - Get the sysv ipc object's secid + * security_ipc_getlsmprop() - Get the sysv ipc object LSM data * @ipcp: ipc permission structure - * @secid: secid pointer + * @prop: pointer to lsm information * - * Get the secid associated with the ipc object. In case of failure, @sec= id - * will be set to zero. + * Get the lsm information associated with the ipc object. */ -void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) + +void security_ipc_getlsmprop(struct kern_ipc_perm *ipcp, struct lsm_prop *= prop) { - *secid =3D 0; - call_void_hook(ipc_getsecid, ipcp, secid); + lsmprop_init(prop); + call_void_hook(ipc_getlsmprop, ipcp, prop); } =20 /** diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index a2da81d0d5f5..10c7fc61a786 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6328,10 +6328,13 @@ static int selinux_ipc_permission(struct kern_ipc_p= erm *ipcp, short flag) return ipc_has_perm(ipcp, av); } =20 -static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) +static void selinux_ipc_getlsmprop(struct kern_ipc_perm *ipcp, + struct lsm_prop *prop) { struct ipc_security_struct *isec =3D selinux_ipc(ipcp); - *secid =3D isec->sid; + prop->selinux.secid =3D isec->sid; + /* scaffolding */ + prop->scaffold.secid =3D isec->sid; } =20 static void selinux_d_instantiate(struct dentry *dentry, struct inode *ino= de) @@ -7252,7 +7255,7 @@ static struct security_hook_list selinux_hooks[] __ro= _after_init =3D { LSM_HOOK_INIT(userns_create, selinux_userns_create), =20 LSM_HOOK_INIT(ipc_permission, selinux_ipc_permission), - LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid), + LSM_HOOK_INIT(ipc_getlsmprop, selinux_ipc_getlsmprop), =20 LSM_HOOK_INIT(msg_queue_associate, selinux_msg_queue_associate), LSM_HOOK_INIT(msg_queue_msgctl, selinux_msg_queue_msgctl), diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 1f478bb08779..7926f40bc7db 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3442,16 +3442,18 @@ static int smack_ipc_permission(struct kern_ipc_per= m *ipp, short flag) } =20 /** - * smack_ipc_getsecid - Extract smack security id + * smack_ipc_getlsmprop - Extract smack security data * @ipp: the object permissions - * @secid: where result will be saved + * @prop: where result will be saved */ -static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) +static void smack_ipc_getlsmprop(struct kern_ipc_perm *ipp, struct lsm_pro= p *prop) { - struct smack_known **blob =3D smack_ipc(ipp); 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Hermes SMTP Server) with ESMTPA ID bfec55394db9c3ecf7e1196118de0a4c; Tue, 10 Sep 2024 18:43:12 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 06/13] Audit: Update shutdown LSM data Date: Tue, 10 Sep 2024 11:41:18 -0700 Message-ID: <20240910184125.224651-7-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The audit process LSM information is changed from a secid audit_sig_sid to an lsm_prop in audit_sig_lsm. Update the users of this data appropriately. Calls to security_secid_to_secctx() are changed to use security_lsmprop_to_secctx() instead. security_current_getsecid_subj() is scaffolded. It will be updated in a subsequent patch. Signed-off-by: Casey Schaufler --- kernel/audit.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/kernel/audit.c b/kernel/audit.c index e7a62ebbf4d1..70f76fed254b 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -123,7 +123,7 @@ static u32 audit_backlog_wait_time =3D AUDIT_BACKLOG_WA= IT_TIME; /* The identity of the user shutting down the audit system. */ static kuid_t audit_sig_uid =3D INVALID_UID; static pid_t audit_sig_pid =3D -1; -static u32 audit_sig_sid; +static struct lsm_prop audit_sig_lsm; =20 /* Records can be lost in several ways: 0) [suppressed in audit_alloc] @@ -1473,20 +1473,21 @@ static int audit_receive_msg(struct sk_buff *skb, s= truct nlmsghdr *nlh, } case AUDIT_SIGNAL_INFO: len =3D 0; - if (audit_sig_sid) { - err =3D security_secid_to_secctx(audit_sig_sid, &ctx, &len); + if (lsmprop_is_set(&audit_sig_lsm)) { + err =3D security_lsmprop_to_secctx(&audit_sig_lsm, &ctx, + &len); if (err) return err; } sig_data =3D kmalloc(struct_size(sig_data, ctx, len), GFP_KERNEL); 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Hermes SMTP Server) with ESMTPA ID bfec55394db9c3ecf7e1196118de0a4c; Tue, 10 Sep 2024 18:43:13 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net, linux-integrity@vger.kernel.org, audit@vger.kernel.org Subject: [PATCH v3 07/13] LSM: Use lsm_prop in security_current_getsecid Date: Tue, 10 Sep 2024 11:41:19 -0700 Message-ID: <20240910184125.224651-8-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Change the security_current_getsecid_subj() and security_task_getsecid_obj() interfaces to fill in a lsm_prop structure instead of a u32 secid. Audit interfaces will need to collect all possible security data for possible reporting. Signed-off-by: Casey Schaufler Cc: linux-integrity@vger.kernel.org Cc: audit@vger.kernel.org Cc: selinux@vger.kernel.org --- include/linux/lsm_hook_defs.h | 6 +-- include/linux/security.h | 13 +++--- kernel/audit.c | 11 +++-- kernel/auditfilter.c | 3 +- kernel/auditsc.c | 22 ++++++---- net/netlabel/netlabel_unlabeled.c | 5 ++- net/netlabel/netlabel_user.h | 6 ++- security/apparmor/lsm.c | 20 ++++++--- security/integrity/ima/ima.h | 6 +-- security/integrity/ima/ima_api.c | 6 +-- security/integrity/ima/ima_appraise.c | 6 +-- security/integrity/ima/ima_main.c | 59 ++++++++++++++------------- security/integrity/ima/ima_policy.c | 14 +++---- security/security.c | 28 ++++++------- security/selinux/hooks.c | 17 +++++--- security/smack/smack_lsm.c | 25 +++++++----- 16 files changed, 139 insertions(+), 108 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 315bbe1f63fc..e53d29c3ca1c 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -232,9 +232,9 @@ LSM_HOOK(int, 0, task_fix_setgroups, struct cred *new, = const struct cred * old) LSM_HOOK(int, 0, task_setpgid, struct task_struct *p, pid_t pgid) LSM_HOOK(int, 0, task_getpgid, struct task_struct *p) LSM_HOOK(int, 0, task_getsid, struct task_struct *p) -LSM_HOOK(void, LSM_RET_VOID, current_getsecid_subj, u32 *secid) -LSM_HOOK(void, LSM_RET_VOID, task_getsecid_obj, - struct task_struct *p, u32 *secid) +LSM_HOOK(void, LSM_RET_VOID, current_getlsmprop_subj, struct lsm_prop *pro= p) +LSM_HOOK(void, LSM_RET_VOID, task_getlsmprop_obj, + struct task_struct *p, struct lsm_prop *prop) LSM_HOOK(int, 0, task_setnice, struct task_struct *p, int nice) LSM_HOOK(int, 0, task_setioprio, struct task_struct *p, int ioprio) LSM_HOOK(int, 0, task_getioprio, struct task_struct *p) diff --git a/include/linux/security.h b/include/linux/security.h index c8f020cf2a84..07c0e635f124 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -492,8 +492,8 @@ int security_task_fix_setgroups(struct cred *new, const= struct cred *old); int security_task_setpgid(struct task_struct *p, pid_t pgid); int security_task_getpgid(struct task_struct *p); int security_task_getsid(struct task_struct *p); -void security_current_getsecid_subj(u32 *secid); -void security_task_getsecid_obj(struct task_struct *p, u32 *secid); +void security_current_getlsmprop_subj(struct lsm_prop *prop); +void security_task_getlsmprop_obj(struct task_struct *p, struct lsm_prop *= prop); int security_task_setnice(struct task_struct *p, int nice); int security_task_setioprio(struct task_struct *p, int ioprio); int security_task_getioprio(struct task_struct *p); @@ -1278,14 +1278,15 @@ static inline int security_task_getsid(struct task_= struct *p) return 0; } =20 -static inline void security_current_getsecid_subj(u32 *secid) +static inline void security_current_getlsmprop_subj(struct lsm_prop *prop) { - *secid =3D 0; + lsmprop_init(prop); } =20 -static inline void security_task_getsecid_obj(struct task_struct *p, u32 *= secid) +static inline void security_task_getlsmprop_obj(struct task_struct *p, + struct lsm_prop *prop) { - *secid =3D 0; + lsmprop_init(prop); } =20 static inline int security_task_setnice(struct task_struct *p, int nice) diff --git a/kernel/audit.c b/kernel/audit.c index 70f76fed254b..399f66557dfa 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -2179,16 +2179,16 @@ void audit_log_key(struct audit_buffer *ab, char *k= ey) =20 int audit_log_task_context(struct audit_buffer *ab) { + struct lsm_prop prop; char *ctx =3D NULL; unsigned len; int error; - u32 sid; =20 - security_current_getsecid_subj(&sid); - if (!sid) + security_current_getlsmprop_subj(&prop); + if (!lsmprop_is_set(&prop)) return 0; =20 - error =3D security_secid_to_secctx(sid, &ctx, &len); + error =3D security_lsmprop_to_secctx(&prop, &ctx, &len); if (error) { if (error !=3D -EINVAL) goto error_path; @@ -2405,8 +2405,7 @@ int audit_signal_info(int sig, struct task_struct *t) audit_sig_uid =3D auid; else audit_sig_uid =3D uid; - /* scaffolding */ - security_current_getsecid_subj(&audit_sig_lsm.scaffold.secid); + security_current_getlsmprop_subj(&audit_sig_lsm); } =20 return audit_signal_info_syscall(t); diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index 5b47571ae4ee..7589845cb9ee 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1371,8 +1371,7 @@ int audit_filter(int msgtype, unsigned int listtype) case AUDIT_SUBJ_CLR: if (f->lsm_rule) { /* scaffolding */ - security_current_getsecid_subj( - &prop.scaffold.secid); + security_current_getlsmprop_subj(&prop); result =3D security_audit_rule_match( &prop, f->type, f->op, f->lsm_rule); diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 3e051014484c..b976b88c19c3 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -470,7 +470,6 @@ static int audit_filter_rules(struct task_struct *tsk, { const struct cred *cred; int i, need_sid =3D 1; - u32 sid; struct lsm_prop prop =3D { }; unsigned int sessionid; =20 @@ -675,15 +674,14 @@ static int audit_filter_rules(struct task_struct *tsk, * fork()/copy_process() in which case * the new @tsk creds are still a dup * of @current's creds so we can still - * use security_current_getsecid_subj() + * use + * security_current_getlsmprop_subj() * here even though it always refs * @current's creds */ - security_current_getsecid_subj(&sid); + security_current_getlsmprop_subj(&prop); need_sid =3D 0; } - /* scaffolding */ - prop.scaffold.secid =3D sid; result =3D security_audit_rule_match(&prop, f->type, f->op, @@ -2730,12 +2728,15 @@ int __audit_sockaddr(int len, void *a) void __audit_ptrace(struct task_struct *t) { struct audit_context *context =3D audit_context(); + struct lsm_prop prop; =20 context->target_pid =3D task_tgid_nr(t); context->target_auid =3D audit_get_loginuid(t); context->target_uid =3D task_uid(t); context->target_sessionid =3D audit_get_sessionid(t); - security_task_getsecid_obj(t, &context->target_sid); + security_task_getlsmprop_obj(t, &prop); + /* scaffolding */ + context->target_sid =3D prop.scaffold.secid; memcpy(context->target_comm, t->comm, TASK_COMM_LEN); } =20 @@ -2751,6 +2752,7 @@ int audit_signal_info_syscall(struct task_struct *t) struct audit_aux_data_pids *axp; struct audit_context *ctx =3D audit_context(); kuid_t t_uid =3D task_uid(t); + struct lsm_prop prop; =20 if (!audit_signals || audit_dummy_context()) return 0; @@ -2762,7 +2764,9 @@ int audit_signal_info_syscall(struct task_struct *t) ctx->target_auid =3D audit_get_loginuid(t); ctx->target_uid =3D t_uid; ctx->target_sessionid =3D audit_get_sessionid(t); - security_task_getsecid_obj(t, &ctx->target_sid); + security_task_getlsmprop_obj(t, &prop); + /* scaffolding */ + ctx->target_sid =3D prop.scaffold.secid; memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); return 0; } @@ -2783,7 +2787,9 @@ int audit_signal_info_syscall(struct task_struct *t) axp->target_auid[axp->pid_count] =3D audit_get_loginuid(t); axp->target_uid[axp->pid_count] =3D t_uid; axp->target_sessionid[axp->pid_count] =3D audit_get_sessionid(t); - security_task_getsecid_obj(t, &axp->target_sid[axp->pid_count]); + security_task_getlsmprop_obj(t, &prop); + /* scaffolding */ + axp->target_sid[axp->pid_count] =3D prop.scaffold.secid; memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); axp->pid_count++; =20 diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unla= beled.c index 9996883bf2b7..5925f48a3ade 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -1534,11 +1534,14 @@ int __init netlbl_unlabel_defconf(void) int ret_val; struct netlbl_dom_map *entry; struct netlbl_audit audit_info; + struct lsm_prop prop; =20 /* Only the kernel is allowed to call this function and the only time * it is called is at bootup before the audit subsystem is reporting * messages so don't worry to much about these values. */ - security_current_getsecid_subj(&audit_info.secid); + security_current_getlsmprop_subj(&prop); + /* scaffolding */ + audit_info.secid =3D prop.scaffold.secid; audit_info.loginuid =3D GLOBAL_ROOT_UID; audit_info.sessionid =3D 0; =20 diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h index d6c5b31eb4eb..39f4f6df5f51 100644 --- a/net/netlabel/netlabel_user.h +++ b/net/netlabel/netlabel_user.h @@ -32,7 +32,11 @@ */ static inline void netlbl_netlink_auditinfo(struct netlbl_audit *audit_inf= o) { - security_current_getsecid_subj(&audit_info->secid); + struct lsm_prop prop; + + security_current_getlsmprop_subj(&prop); + /* scaffolding */ + audit_info->secid =3D prop.scaffold.secid; audit_info->loginuid =3D audit_get_loginuid(current); audit_info->sessionid =3D audit_get_sessionid(current); } diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index ad2499bff591..824a85d2ee85 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -982,17 +982,24 @@ static void apparmor_bprm_committed_creds(const struc= t linux_binprm *bprm) return; } =20 -static void apparmor_current_getsecid_subj(u32 *secid) +static void apparmor_current_getlsmprop_subj(struct lsm_prop *prop) { struct aa_label *label =3D __begin_current_label_crit_section(); - *secid =3D label->secid; + + prop->apparmor.label =3D label; + /* scaffolding */ + prop->scaffold.secid =3D label->secid; __end_current_label_crit_section(label); } =20 -static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid) +static void apparmor_task_getlsmprop_obj(struct task_struct *p, + struct lsm_prop *prop) { struct aa_label *label =3D aa_get_task_label(p); - *secid =3D label->secid; + + prop->apparmor.label =3D label; + /* scaffolding */ + prop->scaffold.secid =3D label->secid; aa_put_label(label); } =20 @@ -1518,8 +1525,9 @@ static struct security_hook_list apparmor_hooks[] __r= o_after_init =3D { =20 LSM_HOOK_INIT(task_free, apparmor_task_free), LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), - LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj), - LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj), + LSM_HOOK_INIT(current_getlsmprop_subj, + apparmor_current_getlsmprop_subj), + LSM_HOOK_INIT(task_getlsmprop_obj, apparmor_task_getlsmprop_obj), LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), LSM_HOOK_INIT(task_kill, apparmor_task_kill), LSM_HOOK_INIT(userns_create, apparmor_userns_create), diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index f17213520c36..791f71036893 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -369,7 +369,7 @@ static inline void ima_process_queued_keys(void) {} =20 /* LIM API function definitions */ int ima_get_action(struct mnt_idmap *idmap, struct inode *inode, - const struct cred *cred, u32 secid, int mask, + const struct cred *cred, struct lsm_prop *prop, int mask, enum ima_hooks func, int *pcr, struct ima_template_desc **template_desc, const char *func_data, unsigned int *allowed_algos); @@ -400,8 +400,8 @@ const char *ima_d_path(const struct path *path, char **= pathbuf, char *filename); =20 /* IMA policy related functions */ int ima_match_policy(struct mnt_idmap *idmap, struct inode *inode, - const struct cred *cred, u32 secid, enum ima_hooks func, - int mask, int flags, int *pcr, + const struct cred *cred, struct lsm_prop *prop, + enum ima_hooks func, int mask, int flags, int *pcr, struct ima_template_desc **template_desc, const char *func_data, unsigned int *allowed_algos); void ima_init_policy(void); diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_= api.c index 984e861f6e33..c35ea613c9f8 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -165,7 +165,7 @@ void ima_add_violation(struct file *file, const unsigne= d char *filename, * @idmap: idmap of the mount the inode was found from * @inode: pointer to the inode associated with the object being validated * @cred: pointer to credentials structure to validate - * @secid: secid of the task being validated + * @prop: properties of the task being validated * @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXEC, * MAY_APPEND) * @func: caller identifier @@ -187,7 +187,7 @@ void ima_add_violation(struct file *file, const unsigne= d char *filename, * */ int ima_get_action(struct mnt_idmap *idmap, struct inode *inode, - const struct cred *cred, u32 secid, int mask, + const struct cred *cred, struct lsm_prop *prop, int mask, enum ima_hooks func, int *pcr, struct ima_template_desc **template_desc, const char *func_data, unsigned int *allowed_algos) @@ -196,7 +196,7 @@ int ima_get_action(struct mnt_idmap *idmap, struct inod= e *inode, =20 flags &=3D ima_policy_flag; =20 - return ima_match_policy(idmap, inode, cred, secid, func, mask, + return ima_match_policy(idmap, inode, cred, prop, func, mask, flags, pcr, template_desc, func_data, allowed_algos); } diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima= /ima_appraise.c index 656c709b974f..884a3533f7af 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -73,13 +73,13 @@ bool is_ima_appraise_enabled(void) int ima_must_appraise(struct mnt_idmap *idmap, struct inode *inode, int mask, enum ima_hooks func) { - u32 secid; + struct lsm_prop prop; =20 if (!ima_appraise) return 0; =20 - security_current_getsecid_subj(&secid); - return ima_match_policy(idmap, inode, current_cred(), secid, + security_current_getlsmprop_subj(&prop); + return ima_match_policy(idmap, inode, current_cred(), &prop, func, mask, IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL, NULL); } diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima= _main.c index f04f43af651c..254ab465a4a6 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -206,8 +206,8 @@ static void ima_file_free(struct file *file) } =20 static int process_measurement(struct file *file, const struct cred *cred, - u32 secid, char *buf, loff_t size, int mask, - enum ima_hooks func) + struct lsm_prop *prop, char *buf, loff_t size, + int mask, enum ima_hooks func) { struct inode *real_inode, *inode =3D file_inode(file); struct ima_iint_cache *iint =3D NULL; @@ -232,7 +232,7 @@ static int process_measurement(struct file *file, const= struct cred *cred, * bitmask based on the appraise/audit/measurement policy. * Included is the appraise submask. */ - action =3D ima_get_action(file_mnt_idmap(file), inode, cred, secid, + action =3D ima_get_action(file_mnt_idmap(file), inode, cred, prop, mask, func, &pcr, &template_desc, NULL, &allowed_algos); violation_check =3D ((func =3D=3D FILE_CHECK || func =3D=3D MMAP_CHECK || @@ -443,23 +443,23 @@ static int process_measurement(struct file *file, con= st struct cred *cred, static int ima_file_mmap(struct file *file, unsigned long reqprot, unsigned long prot, unsigned long flags) { - u32 secid; + struct lsm_prop prop; int ret; =20 if (!file) return 0; =20 - security_current_getsecid_subj(&secid); + security_current_getlsmprop_subj(&prop); =20 if (reqprot & PROT_EXEC) { - ret =3D process_measurement(file, current_cred(), secid, NULL, + ret =3D process_measurement(file, current_cred(), &prop, NULL, 0, MAY_EXEC, MMAP_CHECK_REQPROT); if (ret) return ret; } =20 if (prot & PROT_EXEC) - return process_measurement(file, current_cred(), secid, NULL, + return process_measurement(file, current_cred(), &prop, NULL, 0, MAY_EXEC, MMAP_CHECK); =20 return 0; @@ -488,9 +488,9 @@ static int ima_file_mprotect(struct vm_area_struct *vma= , unsigned long reqprot, char *pathbuf =3D NULL; const char *pathname =3D NULL; struct inode *inode; + struct lsm_prop prop; int result =3D 0; int action; - u32 secid; int pcr; =20 /* Is mprotect making an mmap'ed file executable? */ @@ -498,13 +498,13 @@ static int ima_file_mprotect(struct vm_area_struct *v= ma, unsigned long reqprot, !(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC)) return 0; =20 - security_current_getsecid_subj(&secid); + security_current_getlsmprop_subj(&prop); inode =3D file_inode(vma->vm_file); action =3D ima_get_action(file_mnt_idmap(vma->vm_file), inode, - current_cred(), secid, MAY_EXEC, MMAP_CHECK, + current_cred(), &prop, MAY_EXEC, MMAP_CHECK, &pcr, &template, NULL, NULL); action |=3D ima_get_action(file_mnt_idmap(vma->vm_file), inode, - current_cred(), secid, MAY_EXEC, + current_cred(), &prop, MAY_EXEC, MMAP_CHECK_REQPROT, &pcr, &template, NULL, NULL); =20 @@ -542,15 +542,18 @@ static int ima_bprm_check(struct linux_binprm *bprm) { int ret; u32 secid; + struct lsm_prop prop =3D { }; =20 - security_current_getsecid_subj(&secid); - ret =3D process_measurement(bprm->file, current_cred(), secid, NULL, 0, - MAY_EXEC, BPRM_CHECK); + security_current_getlsmprop_subj(&prop); + ret =3D process_measurement(bprm->file, current_cred(), + &prop, NULL, 0, MAY_EXEC, BPRM_CHECK); if (ret) return ret; =20 security_cred_getsecid(bprm->cred, &secid); - return process_measurement(bprm->file, bprm->cred, secid, NULL, 0, + /* scaffolding */ + prop.scaffold.secid =3D secid; + return process_measurement(bprm->file, bprm->cred, &prop, NULL, 0, MAY_EXEC, CREDS_CHECK); } =20 @@ -566,10 +569,10 @@ static int ima_bprm_check(struct linux_binprm *bprm) */ static int ima_file_check(struct file *file, int mask) { - u32 secid; + struct lsm_prop prop; =20 - security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, NULL, 0, + security_current_getlsmprop_subj(&prop); + return process_measurement(file, current_cred(), &prop, NULL, 0, mask & (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND), FILE_CHECK); } @@ -768,7 +771,7 @@ static int ima_read_file(struct file *file, enum kernel= _read_file_id read_id, bool contents) { enum ima_hooks func; - u32 secid; + struct lsm_prop prop; =20 /* * Do devices using pre-allocated memory run the risk of the @@ -788,9 +791,9 @@ static int ima_read_file(struct file *file, enum kernel= _read_file_id read_id, =20 /* Read entire file for all partial reads. */ func =3D read_idmap[read_id] ?: FILE_CHECK; - security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, NULL, - 0, MAY_READ, func); + security_current_getlsmprop_subj(&prop); + return process_measurement(file, current_cred(), &prop, NULL, 0, + MAY_READ, func); } =20 const int read_idmap[READING_MAX_ID] =3D { @@ -818,7 +821,7 @@ static int ima_post_read_file(struct file *file, char *= buf, loff_t size, enum kernel_read_file_id read_id) { enum ima_hooks func; - u32 secid; + struct lsm_prop prop; =20 /* permit signed certs */ if (!file && read_id =3D=3D READING_X509_CERTIFICATE) @@ -831,8 +834,8 @@ static int ima_post_read_file(struct file *file, char *= buf, loff_t size, } =20 func =3D read_idmap[read_id] ?: FILE_CHECK; - security_current_getsecid_subj(&secid); - return process_measurement(file, current_cred(), secid, buf, size, + security_current_getlsmprop_subj(&prop); + return process_measurement(file, current_cred(), &prop, buf, size, MAY_READ, func); } =20 @@ -967,7 +970,7 @@ int process_buffer_measurement(struct mnt_idmap *idmap, int digest_hash_len =3D hash_digest_size[ima_hash_algo]; int violation =3D 0; int action =3D 0; - u32 secid; + struct lsm_prop prop; =20 if (digest && digest_len < digest_hash_len) return -EINVAL; @@ -990,9 +993,9 @@ int process_buffer_measurement(struct mnt_idmap *idmap, * buffer measurements. */ if (func) { - security_current_getsecid_subj(&secid); + security_current_getlsmprop_subj(&prop); action =3D ima_get_action(idmap, inode, current_cred(), - secid, 0, func, &pcr, &template, + &prop, 0, func, &pcr, &template, func_data, NULL); if (!(action & IMA_MEASURE) && !digest) return -ENOENT; diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/i= ma_policy.c index 22a62e675ebc..a96dc3ff6aa0 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -557,7 +557,7 @@ static bool ima_match_rule_data(struct ima_rule_entry *= rule, * @idmap: idmap of the mount the inode was found from * @inode: a pointer to an inode * @cred: a pointer to a credentials structure for user validation - * @secid: the secid of the task to be validated + * @prop: LSM properties of the task to be validated * @func: LIM hook identifier * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) * @func_data: func specific data, may be NULL @@ -567,7 +567,7 @@ static bool ima_match_rule_data(struct ima_rule_entry *= rule, static bool ima_match_rules(struct ima_rule_entry *rule, struct mnt_idmap *idmap, struct inode *inode, const struct cred *cred, - u32 secid, enum ima_hooks func, int mask, + struct lsm_prop *prop, enum ima_hooks func, int mask, const char *func_data) { int i; @@ -658,8 +658,6 @@ static bool ima_match_rules(struct ima_rule_entry *rule, case LSM_SUBJ_USER: case LSM_SUBJ_ROLE: case LSM_SUBJ_TYPE: - /* scaffolding */ - prop.scaffold.secid =3D secid; rc =3D ima_filter_rule_match(&prop, lsm_rule->lsm[i].type, Audit_equal, lsm_rule->lsm[i].rule); @@ -723,7 +721,7 @@ static int get_subaction(struct ima_rule_entry *rule, e= num ima_hooks func) * @inode: pointer to an inode for which the policy decision is being made * @cred: pointer to a credentials structure for which the policy decision= is * being made - * @secid: LSM secid of the task to be validated + * @prop: LSM properties of the task to be validated * @func: IMA hook identifier * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) * @flags: IMA actions to consider (e.g. IMA_MEASURE | IMA_APPRAISE) @@ -740,8 +738,8 @@ static int get_subaction(struct ima_rule_entry *rule, e= num ima_hooks func) * than writes so ima_match_policy() is classical RCU candidate. */ int ima_match_policy(struct mnt_idmap *idmap, struct inode *inode, - const struct cred *cred, u32 secid, enum ima_hooks func, - int mask, int flags, int *pcr, + const struct cred *cred, struct lsm_prop *prop, + enum ima_hooks func, int mask, int flags, int *pcr, struct ima_template_desc **template_desc, const char *func_data, unsigned int *allowed_algos) { @@ -759,7 +757,7 @@ int ima_match_policy(struct mnt_idmap *idmap, struct in= ode *inode, if (!(entry->action & actmask)) continue; =20 - if (!ima_match_rules(entry, idmap, inode, cred, secid, + if (!ima_match_rules(entry, idmap, inode, cred, prop, func, mask, func_data)) continue; =20 diff --git a/security/security.c b/security/security.c index 410bf69af427..1e603e055c9f 100644 --- a/security/security.c +++ b/security/security.c @@ -3373,33 +3373,33 @@ int security_task_getsid(struct task_struct *p) } =20 /** - * security_current_getsecid_subj() - Get the current task's subjective se= cid - * @secid: secid value + * security_current_getlsmprop_subj() - Current task's subjective LSM data + * @prop: lsm specific information * * Retrieve the subjective security identifier of the current task and ret= urn - * it in @secid. In case of failure, @secid will be set to zero. + * it in @prop. */ -void security_current_getsecid_subj(u32 *secid) +void security_current_getlsmprop_subj(struct lsm_prop *prop) { - *secid =3D 0; - call_void_hook(current_getsecid_subj, secid); + lsmprop_init(prop); + call_void_hook(current_getlsmprop_subj, prop); } -EXPORT_SYMBOL(security_current_getsecid_subj); +EXPORT_SYMBOL(security_current_getlsmprop_subj); =20 /** - * security_task_getsecid_obj() - Get a task's objective secid + * security_task_getlsmprop_obj() - Get a task's objective LSM data * @p: target task - * @secid: secid value + * @prop: lsm specific information * * Retrieve the objective security identifier of the task_struct in @p and - * return it in @secid. In case of failure, @secid will be set to zero. + * return it in @prop. */ -void security_task_getsecid_obj(struct task_struct *p, u32 *secid) +void security_task_getlsmprop_obj(struct task_struct *p, struct lsm_prop *= prop) { - *secid =3D 0; - call_void_hook(task_getsecid_obj, p, secid); + lsmprop_init(prop); + call_void_hook(task_getlsmprop_obj, p, prop); } -EXPORT_SYMBOL(security_task_getsecid_obj); +EXPORT_SYMBOL(security_task_getlsmprop_obj); =20 /** * security_task_setnice() - Check if setting a task's nice value is allow= ed diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 10c7fc61a786..ebab856c8748 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4161,14 +4161,19 @@ static int selinux_task_getsid(struct task_struct *= p) PROCESS__GETSESSION, NULL); } =20 -static void selinux_current_getsecid_subj(u32 *secid) +static void selinux_current_getlsmprop_subj(struct lsm_prop *prop) { - *secid =3D current_sid(); + prop->selinux.secid =3D current_sid(); + /* scaffolding */ + prop->scaffold.secid =3D prop->selinux.secid; } =20 -static void selinux_task_getsecid_obj(struct task_struct *p, u32 *secid) +static void selinux_task_getlsmprop_obj(struct task_struct *p, + struct lsm_prop *prop) { - *secid =3D task_sid_obj(p); + prop->selinux.secid =3D task_sid_obj(p); + /* scaffolding */ + prop->scaffold.secid =3D prop->selinux.secid; } =20 static int selinux_task_setnice(struct task_struct *p, int nice) @@ -7240,8 +7245,8 @@ static struct security_hook_list selinux_hooks[] __ro= _after_init =3D { LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid), LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid), LSM_HOOK_INIT(task_getsid, selinux_task_getsid), - LSM_HOOK_INIT(current_getsecid_subj, selinux_current_getsecid_subj), - LSM_HOOK_INIT(task_getsecid_obj, selinux_task_getsecid_obj), + LSM_HOOK_INIT(current_getlsmprop_subj, selinux_current_getlsmprop_subj), + LSM_HOOK_INIT(task_getlsmprop_obj, selinux_task_getlsmprop_obj), LSM_HOOK_INIT(task_setnice, selinux_task_setnice), LSM_HOOK_INIT(task_setioprio, selinux_task_setioprio), LSM_HOOK_INIT(task_getioprio, selinux_task_getioprio), diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 7926f40bc7db..03d0ac37b210 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2239,30 +2239,35 @@ static int smack_task_getsid(struct task_struct *p) } =20 /** - * smack_current_getsecid_subj - get the subjective secid of the current t= ask - * @secid: where to put the result + * smack_current_getlsmprop_subj - get the subjective secid of the current= task + * @prop: where to put the result * * Sets the secid to contain a u32 version of the task's subjective smack = label. */ -static void smack_current_getsecid_subj(u32 *secid) +static void smack_current_getlsmprop_subj(struct lsm_prop *prop) { struct smack_known *skp =3D smk_of_current(); =20 - *secid =3D skp->smk_secid; + prop->smack.skp =3D skp; + /* scaffolding */ + prop->scaffold.secid =3D skp->smk_secid; } =20 /** - * smack_task_getsecid_obj - get the objective secid of the task + * smack_task_getlsmprop_obj - get the objective data of the task * @p: the task - * @secid: where to put the result + * @prop: where to put the result * * Sets the secid to contain a u32 version of the task's objective smack l= abel. */ -static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid) +static void smack_task_getlsmprop_obj(struct task_struct *p, + struct lsm_prop *prop) { struct smack_known *skp =3D smk_of_task_struct_obj(p); =20 - *secid =3D skp->smk_secid; + prop->smack.skp =3D skp; + /* scaffolding */ + prop->scaffold.secid =3D skp->smk_secid; } =20 /** @@ -5147,8 +5152,8 @@ static struct security_hook_list smack_hooks[] __ro_a= fter_init =3D { LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), LSM_HOOK_INIT(task_getsid, smack_task_getsid), - LSM_HOOK_INIT(current_getsecid_subj, smack_current_getsecid_subj), - LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj), + LSM_HOOK_INIT(current_getlsmprop_subj, smack_current_getlsmprop_subj), + LSM_HOOK_INIT(task_getlsmprop_obj, smack_task_getlsmprop_obj), LSM_HOOK_INIT(task_setnice, smack_task_setnice), LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), --=20 2.46.0 From nobody Sat Nov 30 07:44:08 2024 Received: from sonic311-30.consmr.mail.ne1.yahoo.com (sonic311-30.consmr.mail.ne1.yahoo.com [66.163.188.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A1C3195FF0 for ; 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Hermes SMTP Server) with ESMTPA ID 52d00b93a233ef9d46e84b01a7384b7d; Tue, 10 Sep 2024 18:44:47 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net, linux-integrity@vger.kernel.org Subject: [PATCH v3 08/13] LSM: Use lsm_prop in security_inode_getsecid Date: Tue, 10 Sep 2024 11:41:20 -0700 Message-ID: <20240910184125.224651-9-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Change the security_inode_getsecid() interface to fill in a lsm_prop structure instead of a u32 secid. This allows for its callers to gather data from all registered LSMs. Data is provided for IMA and audit. Change the name to security_inode_getlsmprop(). Signed-off-by: Casey Schaufler Cc: linux-integrity@vger.kernel.org Cc: selinux@vger.kernel.org --- include/linux/lsm_hook_defs.h | 3 ++- include/linux/security.h | 7 ++++--- kernel/auditsc.c | 6 +++++- security/integrity/ima/ima_policy.c | 3 +-- security/security.c | 11 +++++------ security/selinux/hooks.c | 15 +++++++++------ security/smack/smack_lsm.c | 12 +++++++----- 7 files changed, 33 insertions(+), 24 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index e53d29c3ca1c..75131153f89e 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -175,7 +175,8 @@ LSM_HOOK(int, -EOPNOTSUPP, inode_setsecurity, struct in= ode *inode, const char *name, const void *value, size_t size, int flags) LSM_HOOK(int, 0, inode_listsecurity, struct inode *inode, char *buffer, size_t buffer_size) -LSM_HOOK(void, LSM_RET_VOID, inode_getsecid, struct inode *inode, u32 *sec= id) +LSM_HOOK(void, LSM_RET_VOID, inode_getlsmprop, struct inode *inode, + struct lsm_prop *prop) LSM_HOOK(int, 0, inode_copy_up, struct dentry *src, struct cred **new) LSM_HOOK(int, -EOPNOTSUPP, inode_copy_up_xattr, struct dentry *src, const char *name) diff --git a/include/linux/security.h b/include/linux/security.h index 07c0e635f124..6c50dfd70e81 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -440,7 +440,7 @@ int security_inode_getsecurity(struct mnt_idmap *idmap, void **buffer, bool alloc); int security_inode_setsecurity(struct inode *inode, const char *name, cons= t void *value, size_t size, int flags); int security_inode_listsecurity(struct inode *inode, char *buffer, size_t = buffer_size); -void security_inode_getsecid(struct inode *inode, u32 *secid); +void security_inode_getlsmprop(struct inode *inode, struct lsm_prop *prop); int security_inode_copy_up(struct dentry *src, struct cred **new); int security_inode_copy_up_xattr(struct dentry *src, const char *name); int security_kernfs_init_security(struct kernfs_node *kn_dir, @@ -1056,9 +1056,10 @@ static inline int security_inode_listsecurity(struct= inode *inode, char *buffer, return 0; } =20 -static inline void security_inode_getsecid(struct inode *inode, u32 *secid) +static inline void security_inode_getlsmprop(struct inode *inode, + struct lsm_prop *prop) { - *secid =3D 0; + lsmprop_init(prop); } =20 static inline int security_inode_copy_up(struct dentry *src, struct cred *= *new) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index b976b88c19c3..8302c8f44cd4 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -2276,13 +2276,17 @@ static void audit_copy_inode(struct audit_names *na= me, const struct dentry *dentry, struct inode *inode, unsigned int flags) { + struct lsm_prop prop; + name->ino =3D inode->i_ino; name->dev =3D inode->i_sb->s_dev; name->mode =3D inode->i_mode; name->uid =3D inode->i_uid; name->gid =3D inode->i_gid; name->rdev =3D inode->i_rdev; - security_inode_getsecid(inode, &name->osid); + security_inode_getlsmprop(inode, &prop); + /* scaffolding */ + name->osid =3D prop.scaffold.secid; if (flags & AUDIT_INODE_NOEVAL) { name->fcap_ver =3D -1; return; diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/i= ma_policy.c index a96dc3ff6aa0..dbfd554b4624 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -649,8 +649,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, case LSM_OBJ_USER: case LSM_OBJ_ROLE: case LSM_OBJ_TYPE: - /* scaffolding */ - security_inode_getsecid(inode, &prop.scaffold.secid); + security_inode_getlsmprop(inode, &prop); rc =3D ima_filter_rule_match(&prop, lsm_rule->lsm[i].type, Audit_equal, lsm_rule->lsm[i].rule); diff --git a/security/security.c b/security/security.c index 1e603e055c9f..2365626a3365 100644 --- a/security/security.c +++ b/security/security.c @@ -2622,16 +2622,15 @@ int security_inode_listsecurity(struct inode *inode, EXPORT_SYMBOL(security_inode_listsecurity); =20 /** - * security_inode_getsecid() - Get an inode's secid + * security_inode_getlsmprop() - Get an inode's LSM data * @inode: inode - * @secid: secid to return + * @prop: lsm specific information to return * - * Get the secid associated with the node. In case of failure, @secid wil= l be - * set to zero. + * Get the lsm specific information associated with the node. */ -void security_inode_getsecid(struct inode *inode, u32 *secid) +void security_inode_getlsmprop(struct inode *inode, struct lsm_prop *prop) { - call_void_hook(inode_getsecid, inode, secid); + call_void_hook(inode_getlsmprop, inode, prop); } =20 /** diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index ebab856c8748..1db4ecfea764 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3505,15 +3505,18 @@ static int selinux_inode_listsecurity(struct inode = *inode, char *buffer, size_t return len; } =20 -static void selinux_inode_getsecid(struct inode *inode, u32 *secid) +static void selinux_inode_getlsmprop(struct inode *inode, struct lsm_prop = *prop) { struct inode_security_struct *isec =3D inode_security_novalidate(inode); - *secid =3D isec->sid; + + prop->selinux.secid =3D isec->sid; + /* scaffolding */ + prop->scaffold.secid =3D isec->sid; } =20 static int selinux_inode_copy_up(struct dentry *src, struct cred **new) { - u32 sid; + struct lsm_prop prop; struct task_security_struct *tsec; struct cred *new_creds =3D *new; =20 @@ -3525,8 +3528,8 @@ static int selinux_inode_copy_up(struct dentry *src, = struct cred **new) =20 tsec =3D selinux_cred(new_creds); /* Get label from overlay inode and set it in create_sid */ - selinux_inode_getsecid(d_inode(src), &sid); - tsec->create_sid =3D sid; + selinux_inode_getlsmprop(d_inode(src), &prop); + tsec->create_sid =3D prop.selinux.secid; *new =3D new_creds; return 0; } @@ -7211,7 +7214,7 @@ static struct security_hook_list selinux_hooks[] __ro= _after_init =3D { LSM_HOOK_INIT(inode_getsecurity, selinux_inode_getsecurity), LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity), LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity), - LSM_HOOK_INIT(inode_getsecid, selinux_inode_getsecid), + LSM_HOOK_INIT(inode_getlsmprop, selinux_inode_getlsmprop), LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up), LSM_HOOK_INIT(inode_copy_up_xattr, selinux_inode_copy_up_xattr), LSM_HOOK_INIT(path_notify, selinux_path_notify), diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 03d0ac37b210..8c362fe2871c 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1649,15 +1649,17 @@ static int smack_inode_listsecurity(struct inode *i= node, char *buffer, } =20 /** - * smack_inode_getsecid - Extract inode's security id + * smack_inode_getlsmprop - Extract inode's security id * @inode: inode to extract the info from - * @secid: where result will be saved + * @prop: where result will be saved */ -static void smack_inode_getsecid(struct inode *inode, u32 *secid) +static void smack_inode_getlsmprop(struct inode *inode, struct lsm_prop *p= rop) { struct smack_known *skp =3D smk_of_inode(inode); 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Hermes SMTP Server) with ESMTPA ID 52d00b93a233ef9d46e84b01a7384b7d; Tue, 10 Sep 2024 18:44:49 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 09/13] Audit: use an lsm_prop in audit_names Date: Tue, 10 Sep 2024 11:41:21 -0700 Message-ID: <20240910184125.224651-10-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace the osid field in the audit_names structure with a lsm_prop structure. This accommodates the use of an lsm_prop in security_audit_rule_match() and security_inode_getsecid(). Signed-off-by: Casey Schaufler --- kernel/audit.h | 2 +- kernel/auditsc.c | 20 +++++--------------- 2 files changed, 6 insertions(+), 16 deletions(-) diff --git a/kernel/audit.h b/kernel/audit.h index d14924a887c9..8e6f886a83a4 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -82,7 +82,7 @@ struct audit_names { kuid_t uid; kgid_t gid; dev_t rdev; - u32 osid; + struct lsm_prop oprop; struct audit_cap_data fcap; unsigned int fcap_ver; unsigned char type; /* record type */ diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 8302c8f44cd4..0ff78ad7c97b 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -698,19 +698,15 @@ static int audit_filter_rules(struct task_struct *tsk, if (f->lsm_rule) { /* Find files that match */ if (name) { - /* scaffolding */ - prop.scaffold.secid =3D name->osid; result =3D security_audit_rule_match( - &prop, + &name->oprop, f->type, f->op, f->lsm_rule); } else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { - /* scaffolding */ - prop.scaffold.secid =3D n->osid; if (security_audit_rule_match( - &prop, + &n->oprop, f->type, f->op, f->lsm_rule)) { @@ -1562,13 +1558,11 @@ static void audit_log_name(struct audit_context *co= ntext, struct audit_names *n, from_kgid(&init_user_ns, n->gid), MAJOR(n->rdev), MINOR(n->rdev)); - if (n->osid !=3D 0) { + if (lsmprop_is_set(&n->oprop)) { char *ctx =3D NULL; u32 len; =20 - if (security_secid_to_secctx( - n->osid, &ctx, &len)) { - audit_log_format(ab, " osid=3D%u", n->osid); + if (security_lsmprop_to_secctx(&n->oprop, &ctx, &len)) { if (call_panic) *call_panic =3D 2; } else { @@ -2276,17 +2270,13 @@ static void audit_copy_inode(struct audit_names *na= me, const struct dentry *dentry, struct inode *inode, unsigned int flags) { - struct lsm_prop prop; - name->ino =3D inode->i_ino; name->dev =3D inode->i_sb->s_dev; name->mode =3D inode->i_mode; name->uid =3D inode->i_uid; name->gid =3D inode->i_gid; name->rdev =3D inode->i_rdev; - security_inode_getlsmprop(inode, &prop); - /* scaffolding */ - name->osid =3D prop.scaffold.secid; 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Hermes SMTP Server) with ESMTPA ID 52d00b93a233ef9d46e84b01a7384b7d; Tue, 10 Sep 2024 18:44:50 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net, linux-integrity@vger.kernel.org, audit@vger.kernel.org Subject: [PATCH v3 10/13] LSM: Create new security_cred_getlsmprop LSM hook Date: Tue, 10 Sep 2024 11:41:22 -0700 Message-ID: <20240910184125.224651-11-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Create a new LSM hook security_cred_getlsmprop() which, like security_cred_getsecid(), fetches LSM specific attributes from the cred structure. The associated data elements in the audit sub-system are changed from a secid to a lsm_prop to accommodate multiple possible LSM audit users. Signed-off-by: Casey Schaufler Cc: linux-integrity@vger.kernel.org Cc: audit@vger.kernel.org Cc: selinux@vger.kernel.org --- include/linux/lsm_hook_defs.h | 2 ++ include/linux/security.h | 5 +++++ security/integrity/ima/ima_main.c | 7 ++----- security/security.c | 15 +++++++++++++++ security/selinux/hooks.c | 8 ++++++++ security/smack/smack_lsm.c | 18 ++++++++++++++++++ 6 files changed, 50 insertions(+), 5 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 75131153f89e..75b3f5c7cb6d 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -215,6 +215,8 @@ LSM_HOOK(int, 0, cred_prepare, struct cred *new, const = struct cred *old, LSM_HOOK(void, LSM_RET_VOID, cred_transfer, struct cred *new, const struct cred *old) LSM_HOOK(void, LSM_RET_VOID, cred_getsecid, const struct cred *c, u32 *sec= id) +LSM_HOOK(void, LSM_RET_VOID, cred_getlsmprop, const struct cred *c, + struct lsm_prop *prop) LSM_HOOK(int, 0, kernel_act_as, struct cred *new, u32 secid) LSM_HOOK(int, 0, kernel_create_files_as, struct cred *new, struct inode *i= node) LSM_HOOK(int, 0, kernel_module_request, char *kmod_name) diff --git a/include/linux/security.h b/include/linux/security.h index 6c50dfd70e81..ed13cf5bbe1f 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -473,6 +473,7 @@ void security_cred_free(struct cred *cred); int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t= gfp); void security_transfer_creds(struct cred *new, const struct cred *old); void security_cred_getsecid(const struct cred *c, u32 *secid); +void security_cred_getlsmprop(const struct cred *c, struct lsm_prop *prop); int security_kernel_act_as(struct cred *new, u32 secid); int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_module_request(char *kmod_name); @@ -1202,6 +1203,10 @@ static inline void security_cred_getsecid(const stru= ct cred *c, u32 *secid) *secid =3D 0; } =20 +static inline void security_cred_getlsmprop(const struct cred *c, + struct lsm_prop *prop) +{ } + static inline int security_kernel_act_as(struct cred *cred, u32 secid) { return 0; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima= _main.c index 254ab465a4a6..09ed06598805 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -541,8 +541,7 @@ static int ima_file_mprotect(struct vm_area_struct *vma= , unsigned long reqprot, static int ima_bprm_check(struct linux_binprm *bprm) { int ret; - u32 secid; - struct lsm_prop prop =3D { }; + struct lsm_prop prop; =20 security_current_getlsmprop_subj(&prop); ret =3D process_measurement(bprm->file, current_cred(), @@ -550,9 +549,7 @@ static int ima_bprm_check(struct linux_binprm *bprm) if (ret) return ret; =20 - security_cred_getsecid(bprm->cred, &secid); - /* scaffolding */ - prop.scaffold.secid =3D secid; + security_cred_getlsmprop(bprm->cred, &prop); return process_measurement(bprm->file, bprm->cred, &prop, NULL, 0, MAY_EXEC, CREDS_CHECK); } diff --git a/security/security.c b/security/security.c index 2365626a3365..137ceea105a6 100644 --- a/security/security.c +++ b/security/security.c @@ -3153,6 +3153,21 @@ void security_cred_getsecid(const struct cred *c, u3= 2 *secid) } EXPORT_SYMBOL(security_cred_getsecid); =20 +/** + * security_cred_getlsmprop() - Get the LSM data from a set of credentials + * @c: credentials + * @prop: destination for the LSM data + * + * Retrieve the security data of the cred structure @c. In case of + * failure, @prop will be cleared. + */ +void security_cred_getlsmprop(const struct cred *c, struct lsm_prop *prop) +{ + lsmprop_init(prop); + call_void_hook(cred_getlsmprop, c, prop); +} +EXPORT_SYMBOL(security_cred_getlsmprop); + /** * security_kernel_act_as() - Set the kernel credentials to act as secid * @new: credentials diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 1db4ecfea764..a523f38faca0 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4029,6 +4029,13 @@ static void selinux_cred_getsecid(const struct cred = *c, u32 *secid) *secid =3D cred_sid(c); } =20 +static void selinux_cred_getlsmprop(const struct cred *c, struct lsm_prop = *prop) +{ + prop->selinux.secid =3D cred_sid(c); + /* scaffolding */ + prop->scaffold.secid =3D prop->selinux.secid; +} + /* * set the security data for a kernel service * - all the creation contexts are set to unlabelled @@ -7240,6 +7247,7 @@ static struct security_hook_list selinux_hooks[] __ro= _after_init =3D { LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare), LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer), LSM_HOOK_INIT(cred_getsecid, selinux_cred_getsecid), + LSM_HOOK_INIT(cred_getlsmprop, selinux_cred_getlsmprop), LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as), LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as), LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request), diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 8c362fe2871c..4d236a5ea5c6 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2150,6 +2150,23 @@ static void smack_cred_getsecid(const struct cred *c= red, u32 *secid) rcu_read_unlock(); } =20 +/** + * smack_cred_getlsmprop - get the Smack label for a creds structure + * @cred: the object creds + * @prop: where to put the data + * + * Sets the Smack part of the ref + */ +static void smack_cred_getlsmprop(const struct cred *cred, + struct lsm_prop *prop) +{ + rcu_read_lock(); + prop->smack.skp =3D smk_of_task(smack_cred(cred)); + /* scaffolding */ + prop->scaffold.secid =3D prop->smack.skp->smk_secid; + rcu_read_unlock(); +} + /** * smack_kernel_act_as - Set the subjective context in a set of credentials * @new: points to the set of credentials to be modified. @@ -5149,6 +5166,7 @@ static struct security_hook_list smack_hooks[] __ro_a= fter_init =3D { LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), + LSM_HOOK_INIT(cred_getlsmprop, smack_cred_getlsmprop), LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), --=20 2.46.0 From nobody Sat Nov 30 07:44:08 2024 Received: from sonic309-27.consmr.mail.ne1.yahoo.com (sonic309-27.consmr.mail.ne1.yahoo.com [66.163.184.153]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 794461A76B2 for ; 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Hermes SMTP Server) with ESMTPA ID 52d00b93a233ef9d46e84b01a7384b7d; Tue, 10 Sep 2024 18:44:52 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 11/13] Audit: Change context data from secid to lsm_prop Date: Tue, 10 Sep 2024 11:41:23 -0700 Message-ID: <20240910184125.224651-12-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Change the LSM data stored in the audit transactions from a secid to an LSM prop. This is done in struct audit_context and struct audit_aux_data_pids. Several cases of scaffolding can be removed. Signed-off-by: Casey Schaufler --- kernel/audit.h | 2 +- kernel/auditfilter.c | 1 - kernel/auditsc.c | 31 ++++++++++++------------------- 3 files changed, 13 insertions(+), 21 deletions(-) diff --git a/kernel/audit.h b/kernel/audit.h index 8e6f886a83a4..0211cb307d30 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -144,7 +144,7 @@ struct audit_context { kuid_t target_auid; kuid_t target_uid; unsigned int target_sessionid; - u32 target_sid; + struct lsm_prop target_ref; char target_comm[TASK_COMM_LEN]; =20 struct audit_tree_refs *trees, *first_trees; diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index 7589845cb9ee..1d8381191ffa 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1370,7 +1370,6 @@ int audit_filter(int msgtype, unsigned int listtype) case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: if (f->lsm_rule) { - /* scaffolding */ security_current_getlsmprop_subj(&prop); result =3D security_audit_rule_match( &prop, f->type, f->op, diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 0ff78ad7c97b..3d3a7cbc6c5e 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -100,7 +100,7 @@ struct audit_aux_data_pids { kuid_t target_auid[AUDIT_AUX_PIDS]; kuid_t target_uid[AUDIT_AUX_PIDS]; unsigned int target_sessionid[AUDIT_AUX_PIDS]; - u32 target_sid[AUDIT_AUX_PIDS]; + struct lsm_prop target_ref[AUDIT_AUX_PIDS]; char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; int pid_count; }; @@ -1019,7 +1019,7 @@ static void audit_reset_context(struct audit_context = *ctx) ctx->target_pid =3D 0; ctx->target_auid =3D ctx->target_uid =3D KUIDT_INIT(0); ctx->target_sessionid =3D 0; - ctx->target_sid =3D 0; + lsmprop_init(&ctx->target_ref); ctx->target_comm[0] =3D '\0'; unroll_tree_refs(ctx, NULL, 0); WARN_ON(!list_empty(&ctx->killed_trees)); @@ -1093,8 +1093,9 @@ static inline void audit_free_context(struct audit_co= ntext *context) } =20 static int audit_log_pid_context(struct audit_context *context, pid_t pid, - kuid_t auid, kuid_t uid, unsigned int sessionid, - u32 sid, char *comm) + kuid_t auid, kuid_t uid, + unsigned int sessionid, struct lsm_prop *prop, + char *comm) { struct audit_buffer *ab; char *ctx =3D NULL; @@ -1108,8 +1109,8 @@ static int audit_log_pid_context(struct audit_context= *context, pid_t pid, audit_log_format(ab, "opid=3D%d oauid=3D%d ouid=3D%d oses=3D%d", pid, from_kuid(&init_user_ns, auid), from_kuid(&init_user_ns, uid), sessionid); - if (sid) { - if (security_secid_to_secctx(sid, &ctx, &len)) { + if (lsmprop_is_set(prop)) { + if (security_lsmprop_to_secctx(prop, &ctx, &len)) { audit_log_format(ab, " obj=3D(none)"); rc =3D 1; } else { @@ -1778,7 +1779,7 @@ static void audit_log_exit(void) axs->target_auid[i], axs->target_uid[i], axs->target_sessionid[i], - axs->target_sid[i], + &axs->target_ref[i], axs->target_comm[i])) call_panic =3D 1; } @@ -1787,7 +1788,7 @@ static void audit_log_exit(void) audit_log_pid_context(context, context->target_pid, context->target_auid, context->target_uid, context->target_sessionid, - context->target_sid, context->target_comm)) + &context->target_ref, context->target_comm)) call_panic =3D 1; =20 if (context->pwd.dentry && context->pwd.mnt) { @@ -2722,15 +2723,12 @@ int __audit_sockaddr(int len, void *a) void __audit_ptrace(struct task_struct *t) { struct audit_context *context =3D audit_context(); - struct lsm_prop prop; =20 context->target_pid =3D task_tgid_nr(t); context->target_auid =3D audit_get_loginuid(t); context->target_uid =3D task_uid(t); context->target_sessionid =3D audit_get_sessionid(t); - security_task_getlsmprop_obj(t, &prop); - /* scaffolding */ - context->target_sid =3D prop.scaffold.secid; + security_task_getlsmprop_obj(t, &context->target_ref); memcpy(context->target_comm, t->comm, TASK_COMM_LEN); } =20 @@ -2746,7 +2744,6 @@ int audit_signal_info_syscall(struct task_struct *t) struct audit_aux_data_pids *axp; struct audit_context *ctx =3D audit_context(); kuid_t t_uid =3D task_uid(t); - struct lsm_prop prop; =20 if (!audit_signals || audit_dummy_context()) return 0; @@ -2758,9 +2755,7 @@ int audit_signal_info_syscall(struct task_struct *t) ctx->target_auid =3D audit_get_loginuid(t); ctx->target_uid =3D t_uid; ctx->target_sessionid =3D audit_get_sessionid(t); - security_task_getlsmprop_obj(t, &prop); - /* scaffolding */ - ctx->target_sid =3D prop.scaffold.secid; + security_task_getlsmprop_obj(t, &ctx->target_ref); memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); return 0; } @@ -2781,9 +2776,7 @@ int audit_signal_info_syscall(struct task_struct *t) axp->target_auid[axp->pid_count] =3D audit_get_loginuid(t); 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Hermes SMTP Server) with ESMTPA ID 2439121b4758407954183c0b5224f0f9; Tue, 10 Sep 2024 18:46:26 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 12/13] Use lsm_prop for audit data Date: Tue, 10 Sep 2024 11:41:24 -0700 Message-ID: <20240910184125.224651-13-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace the secid in the netlbl_audit structure with an lsm_prop. Remove scaffolding that was required when the value was a secid. Signed-off-by: Casey Schaufler --- include/net/netlabel.h | 2 +- net/netlabel/netlabel_unlabeled.c | 5 +---- net/netlabel/netlabel_user.c | 7 +++---- net/netlabel/netlabel_user.h | 6 +----- security/smack/smackfs.c | 4 +--- 5 files changed, 7 insertions(+), 17 deletions(-) diff --git a/include/net/netlabel.h b/include/net/netlabel.h index 654bc777d2a7..37f5a290f040 100644 --- a/include/net/netlabel.h +++ b/include/net/netlabel.h @@ -97,7 +97,7 @@ struct calipso_doi; =20 /* NetLabel audit information */ struct netlbl_audit { - u32 secid; + struct lsm_prop prop; kuid_t loginuid; unsigned int sessionid; }; diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unla= beled.c index 5925f48a3ade..1bc2d0890a9f 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -1534,14 +1534,11 @@ int __init netlbl_unlabel_defconf(void) int ret_val; struct netlbl_dom_map *entry; struct netlbl_audit audit_info; - struct lsm_prop prop; =20 /* Only the kernel is allowed to call this function and the only time * it is called is at bootup before the audit subsystem is reporting * messages so don't worry to much about these values. */ - security_current_getlsmprop_subj(&prop); - /* scaffolding */ - audit_info.secid =3D prop.scaffold.secid; + security_current_getlsmprop_subj(&audit_info.prop); audit_info.loginuid =3D GLOBAL_ROOT_UID; audit_info.sessionid =3D 0; =20 diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c index 3ed4fea2a2de..81635a13987b 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -98,10 +98,9 @@ struct audit_buffer *netlbl_audit_start_common(int type, from_kuid(&init_user_ns, audit_info->loginuid), audit_info->sessionid); =20 - if (audit_info->secid !=3D 0 && - security_secid_to_secctx(audit_info->secid, - &secctx, - &secctx_len) =3D=3D 0) { + if (lsmprop_is_set(&audit_info->prop) && + security_lsmprop_to_secctx(&audit_info->prop, &secctx, + &secctx_len) =3D=3D 0) { audit_log_format(audit_buf, " subj=3D%s", secctx); security_release_secctx(secctx, secctx_len); } diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h index 39f4f6df5f51..d4c434956212 100644 --- a/net/netlabel/netlabel_user.h +++ b/net/netlabel/netlabel_user.h @@ -32,11 +32,7 @@ */ static inline void netlbl_netlink_auditinfo(struct netlbl_audit *audit_inf= o) { - struct lsm_prop prop; - - security_current_getlsmprop_subj(&prop); - /* scaffolding */ - audit_info->secid =3D prop.scaffold.secid; + security_current_getlsmprop_subj(&audit_info->prop); audit_info->loginuid =3D audit_get_loginuid(current); audit_info->sessionid =3D audit_get_sessionid(current); } diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index e22aad7604e8..96e7cfc45e21 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -182,11 +182,9 @@ static inline void smack_catset_bit(unsigned int cat, = char *catsetp) */ static void smk_netlabel_audit_set(struct netlbl_audit *nap) { - struct smack_known *skp =3D smk_of_current(); - nap->loginuid =3D audit_get_loginuid(current); nap->sessionid =3D audit_get_sessionid(current); - nap->secid =3D skp->smk_secid; + nap->prop.smack.skp =3D smk_of_current(); } =20 /* --=20 2.46.0 From nobody Sat Nov 30 07:44:08 2024 Received: from sonic306-26.consmr.mail.ne1.yahoo.com (sonic306-26.consmr.mail.ne1.yahoo.com [66.163.189.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A0831A7048 for ; 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Hermes SMTP Server) with ESMTPA ID 2439121b4758407954183c0b5224f0f9; Tue, 10 Sep 2024 18:46:27 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, linux-security-module@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, mic@digikod.net Subject: [PATCH v3 13/13] LSM: Remove lsm_prop scaffolding Date: Tue, 10 Sep 2024 11:41:25 -0700 Message-ID: <20240910184125.224651-14-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910184125.224651-1-casey@schaufler-ca.com> References: <20240910184125.224651-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Remove the scaffold member from the lsm_prop. Remove the remaining places it is being set. Signed-off-by: Casey Schaufler --- include/linux/security.h | 6 ------ security/apparmor/audit.c | 6 +----- security/apparmor/lsm.c | 4 ---- security/apparmor/secid.c | 6 +----- security/selinux/hooks.c | 18 +----------------- security/selinux/ss/services.c | 4 ---- security/smack/smack_lsm.c | 33 ++++----------------------------- 7 files changed, 7 insertions(+), 70 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index ed13cf5bbe1f..86610ae0a9d2 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -144,11 +144,6 @@ enum lockdown_reason { LOCKDOWN_CONFIDENTIALITY_MAX, }; =20 -/* scaffolding */ -struct lsm_prop_scaffold { - u32 secid; -}; - /* * Data exported by the security modules */ @@ -157,7 +152,6 @@ struct lsm_prop { struct lsm_prop_smack smack; struct lsm_prop_apparmor apparmor; struct lsm_prop_bpf bpf; - struct lsm_prop_scaffold scaffold; }; =20 extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1]; diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index 87df6fa2a48d..73087d76f649 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -270,11 +270,7 @@ int aa_audit_rule_match(struct lsm_prop *prop, u32 fie= ld, u32 op, void *vrule) struct aa_label *label; int found =3D 0; =20 - /* scaffolding */ - if (!prop->apparmor.label && prop->scaffold.secid) - label =3D aa_secid_to_label(prop->scaffold.secid); - else - label =3D prop->apparmor.label; + label =3D prop->apparmor.label; =20 if (!label) return -ENOENT; diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 824a85d2ee85..e2e83519d5c3 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -987,8 +987,6 @@ static void apparmor_current_getlsmprop_subj(struct lsm= _prop *prop) struct aa_label *label =3D __begin_current_label_crit_section(); =20 prop->apparmor.label =3D label; - /* scaffolding */ - prop->scaffold.secid =3D label->secid; __end_current_label_crit_section(label); } =20 @@ -998,8 +996,6 @@ static void apparmor_task_getlsmprop_obj(struct task_st= ruct *p, struct aa_label *label =3D aa_get_task_label(p); =20 prop->apparmor.label =3D label; - /* scaffolding */ - prop->scaffold.secid =3D label->secid; aa_put_label(label); } =20 diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c index 34610888559f..6350d107013a 100644 --- a/security/apparmor/secid.c +++ b/security/apparmor/secid.c @@ -102,11 +102,7 @@ int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, = char **secdata, { struct aa_label *label; =20 - /* scaffolding */ - if (!prop->apparmor.label && prop->scaffold.secid) - label =3D aa_secid_to_label(prop->scaffold.secid); - else - label =3D prop->apparmor.label; + label =3D prop->apparmor.label; =20 return apparmor_label_to_secctx(label, secdata, seclen); } diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index a523f38faca0..3177d39faf79 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3510,8 +3510,6 @@ static void selinux_inode_getlsmprop(struct inode *in= ode, struct lsm_prop *prop) struct inode_security_struct *isec =3D inode_security_novalidate(inode); =20 prop->selinux.secid =3D isec->sid; - /* scaffolding */ - prop->scaffold.secid =3D isec->sid; } =20 static int selinux_inode_copy_up(struct dentry *src, struct cred **new) @@ -4032,8 +4030,6 @@ static void selinux_cred_getsecid(const struct cred *= c, u32 *secid) static void selinux_cred_getlsmprop(const struct cred *c, struct lsm_prop = *prop) { prop->selinux.secid =3D cred_sid(c); - /* scaffolding */ - prop->scaffold.secid =3D prop->selinux.secid; } =20 /* @@ -4174,16 +4170,12 @@ static int selinux_task_getsid(struct task_struct *= p) static void selinux_current_getlsmprop_subj(struct lsm_prop *prop) { prop->selinux.secid =3D current_sid(); - /* scaffolding */ - prop->scaffold.secid =3D prop->selinux.secid; } =20 static void selinux_task_getlsmprop_obj(struct task_struct *p, struct lsm_prop *prop) { prop->selinux.secid =3D task_sid_obj(p); - /* scaffolding */ - prop->scaffold.secid =3D prop->selinux.secid; } =20 static int selinux_task_setnice(struct task_struct *p, int nice) @@ -6348,8 +6340,6 @@ static void selinux_ipc_getlsmprop(struct kern_ipc_pe= rm *ipcp, { struct ipc_security_struct *isec =3D selinux_ipc(ipcp); prop->selinux.secid =3D isec->sid; - /* scaffolding */ - prop->scaffold.secid =3D isec->sid; } =20 static void selinux_d_instantiate(struct dentry *dentry, struct inode *ino= de) @@ -6634,13 +6624,7 @@ static int selinux_secid_to_secctx(u32 secid, char *= *secdata, u32 *seclen) static int selinux_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, u32 *seclen) { - u32 secid =3D prop->selinux.secid; - - /* scaffolding */ - if (!secid) - secid =3D prop->scaffold.secid; - - return selinux_secid_to_secctx(secid, secdata, seclen); + return selinux_secid_to_secctx(prop->selinux.secid, secdata, seclen); } =20 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *s= ecid) diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 74b1aafda399..14c583d171fc 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -3659,10 +3659,6 @@ int selinux_audit_rule_match(struct lsm_prop *prop, = u32 field, u32 op, void *vru goto out; } =20 - /* scaffolding */ - if (!prop->selinux.secid && prop->scaffold.secid) - prop->selinux.secid =3D prop->scaffold.secid; - ctxt =3D sidtab_search(policy->sidtab, prop->selinux.secid); if (unlikely(!ctxt)) { WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 4d236a5ea5c6..e5b47342c274 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1655,11 +1655,7 @@ static int smack_inode_listsecurity(struct inode *in= ode, char *buffer, */ static void smack_inode_getlsmprop(struct inode *inode, struct lsm_prop *p= rop) { - struct smack_known *skp =3D smk_of_inode(inode); - - prop->smack.skp =3D skp; - /* scaffolding */ - prop->scaffold.secid =3D skp->smk_secid; + prop->smack.skp =3D smk_of_inode(inode); } =20 /* @@ -2162,8 +2158,6 @@ static void smack_cred_getlsmprop(const struct cred *= cred, { rcu_read_lock(); prop->smack.skp =3D smk_of_task(smack_cred(cred)); - /* scaffolding */ - prop->scaffold.secid =3D prop->smack.skp->smk_secid; rcu_read_unlock(); } =20 @@ -2265,11 +2259,7 @@ static int smack_task_getsid(struct task_struct *p) */ static void smack_current_getlsmprop_subj(struct lsm_prop *prop) { - struct smack_known *skp =3D smk_of_current(); - - prop->smack.skp =3D skp; - /* scaffolding */ - prop->scaffold.secid =3D skp->smk_secid; + prop->smack.skp =3D smk_of_current(); } =20 /** @@ -2282,11 +2272,7 @@ static void smack_current_getlsmprop_subj(struct lsm= _prop *prop) static void smack_task_getlsmprop_obj(struct task_struct *p, struct lsm_prop *prop) { - struct smack_known *skp =3D smk_of_task_struct_obj(p); - - prop->smack.skp =3D skp; - /* scaffolding */ - prop->scaffold.secid =3D skp->smk_secid; + prop->smack.skp =3D smk_of_task_struct_obj(p); } =20 /** @@ -3473,11 +3459,8 @@ static int smack_ipc_permission(struct kern_ipc_perm= *ipp, short flag) static void smack_ipc_getlsmprop(struct kern_ipc_perm *ipp, struct lsm_pro= p *prop) { struct smack_known **iskpp =3D smack_ipc(ipp); - struct smack_known *iskp =3D *iskpp; =20 - prop->smack.skp =3D iskp; - /* scaffolding */ - prop->scaffold.secid =3D iskp->smk_secid; + prop->smack.skp =3D *iskpp; } =20 /** @@ -4824,10 +4807,6 @@ static int smack_audit_rule_match(struct lsm_prop *p= rop, u32 field, u32 op, if (field !=3D AUDIT_SUBJ_USER && field !=3D AUDIT_OBJ_USER) return 0; =20 - /* scaffolding */ - if (!skp && prop->scaffold.secid) - skp =3D smack_from_secid(prop->scaffold.secid); - /* * No need to do string comparisons. If a match occurs, * both pointers will point to the same smack_known @@ -4888,10 +4867,6 @@ static int smack_lsmprop_to_secctx(struct lsm_prop *= prop, char **secdata, { struct smack_known *skp =3D prop->smack.skp; =20 - /* scaffolding */ - if (!skp && prop->scaffold.secid) - skp =3D smack_from_secid(prop->scaffold.secid); - if (secdata) *secdata =3D skp->smk_known; *seclen =3D strlen(skp->smk_known); --=20 2.46.0