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Hermes SMTP Server) with ESMTPA ID 5da78dbe3e0c562970426cfb16ce357c; Fri, 30 Aug 2024 00:34:17 +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 v2 02/13] LSM: Use lsmblob in security_audit_rule_match Date: Thu, 29 Aug 2024 17:34:00 -0700 Message-ID: <20240830003411.16818-3-casey@schaufler-ca.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240830003411.16818-1-casey@schaufler-ca.com> References: <20240830003411.16818-1-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 lsmblob structure pointer. Pass the entry from the lsmblob structure for the approprite slot to the LSM hook. Change the users of security_audit_rule_match to use the lsmblob instead of a u32. The scaffolding function lsmblob_init() fills the blob 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 blob structure later in the series. At the point the use of lsmblob_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_policy.c | 11 +++++++---- security/security.c | 7 ++++--- security/selinux/include/audit.h | 5 +++-- security/selinux/ss/services.c | 11 ++++++++--- security/smack/smack_lsm.c | 11 ++++++++--- 11 files changed, 64 insertions(+), 30 deletions(-) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 855db460e08b..1d3bdf71109e 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 lsmblob *blob, u32 field, u32 op, + 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 0057a22137e8..c0ed2119a622 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 lsmblob *blob, 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 lsmblob *blob, u32 fiel= d, + u32 op, void *lsmrule) { return 0; } diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index d6ef4f4f9cba..c4c7cda3b846 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 lsmblob blob =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( + &blob.scaffold.secid); + result =3D security_audit_rule_match( + &blob, f->type, f->op, + f->lsm_rule); } break; case AUDIT_EXE: diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 6f0d6fb6523f..23adb15cae43 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 lsmblob blob =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 */ + blob.scaffold.secid =3D sid; + result =3D security_audit_rule_match(&blob, + 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 */ + blob.scaffold.secid =3D name->osid; result =3D security_audit_rule_match( - name->osid, + &blob, f->type, f->op, f->lsm_rule); } else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { + /* scaffolding */ + blob.scaffold.secid =3D n->osid; if (security_audit_rule_match( - n->osid, + &blob, 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 */ + blob.scaffold.secid =3D ctx->ipc.osid; + if (security_audit_rule_match(&blob, f->type, f->op, f->lsm_rule)) ++result; diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index 6b5181c668b5..758b75a9c1c5 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 lsmblob *blob, u32 field, u32 op, void *vru= le) { 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 (!blob->apparmor.label && blob->scaffold.secid) + label =3D aa_secid_to_label(blob->scaffold.secid); + else + label =3D blob->apparmor.label; =20 if (!label) return -ENOENT; diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/= audit.h index 0c8cc86b417b..c5a516e61318 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 lsmblob *blob, u32 field, u32 op, void *vru= le); =20 #endif /* __AA_AUDIT_H */ diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/i= ma_policy.c index 09da8e639239..40119816b848 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 lsmblob blob =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, &blob.scaffold.secid); + rc =3D ima_filter_rule_match(&blob, 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 */ + blob.scaffold.secid =3D secid; + rc =3D ima_filter_rule_match(&blob, 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..64a6d6bbd1f4 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 + * @lsmblob: 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 lsmblob *blob, u32 field, u32 op, + void *lsmrule) { - return call_int_hook(audit_rule_match, secid, field, op, lsmrule); + return call_int_hook(audit_rule_match, blob, field, op, lsmrule); } #endif /* CONFIG_AUDIT */ =20 diff --git a/security/selinux/include/audit.h b/security/selinux/include/au= dit.h index 29c7d4c86f6d..104165e4c931 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 + * @blob: 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 +49,8 @@ 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(u32 sid, u32 field, u32 op, void *rule); +int selinux_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, + void *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..43eb1d46942c 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -3633,7 +3633,8 @@ 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 lsmblob *blob, u32 field, u32 op, + void *vrule) { struct selinux_state *state =3D &selinux_state; struct selinux_policy *policy; @@ -3659,10 +3660,14 @@ 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 (!blob->selinux.secid && blob->scaffold.secid) + blob->selinux.secid =3D blob->scaffold.secid; + + ctxt =3D sidtab_search(policy->sidtab, blob->selinux.secid); if (unlikely(!ctxt)) { WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", - sid); + blob->selinux.secid); match =3D -ENOENT; goto out; } diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 4164699cd4f6..52d5ef986db8 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 + * @blob: 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 lsmblob *blob, 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 (!blob->smack.skp && blob->scaffold.secid) + skp =3D smack_from_secid(blob->scaffold.secid); + else + skp =3D blob->smack.skp; =20 /* * No need to do string comparisons. If a match occurs, --=20 2.46.0