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Wed, 24 Apr 2024 01:20:26 -0700 (PDT) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Ross Lagerwall , Anthony PERARD Subject: [PATCH v4 1/4] xen-livepatch: fix parameter name parsing Date: Wed, 24 Apr 2024 10:19:54 +0200 Message-ID: <20240424081957.34326-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240424081957.34326-1-roger.pau@citrix.com> References: <20240424081957.34326-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1713946861024100003 It's incorrect to restrict strncmp to the length of the command line input parameter, as then a user passing a rune like: % xen-livepatch up foo.livepatch Would match against the "upload" command, because the string comparison has been truncated to the length of the input argument. Use strcmp instead whi= ch doesn't truncate. Otherwise in order to keep using strncmp we would need to also check strings are of the same length before doing the comparison. Fixes: 05bb8afedede ('xen-xsplice: Tool to manipulate xsplice payloads') Signed-off-by: Roger Pau Monn=C3=A9 Acked-by: Anthony PERARD Reviewed-by: Ross Lagerwall --- Changes since v3: - Use strcmp. Changes since v2: - New in this version. --- tools/misc/xen-livepatch.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/misc/xen-livepatch.c b/tools/misc/xen-livepatch.c index 5bf9d9a32b65..2c4f69e596fa 100644 --- a/tools/misc/xen-livepatch.c +++ b/tools/misc/xen-livepatch.c @@ -572,13 +572,13 @@ int main(int argc, char *argv[]) return 0; } for ( i =3D 0; i < ARRAY_SIZE(main_options); i++ ) - if (!strncmp(main_options[i].name, argv[1], strlen(argv[1]))) + if (!strcmp(main_options[i].name, argv[1])) break; =20 if ( i =3D=3D ARRAY_SIZE(main_options) ) { for ( j =3D 0; j < ARRAY_SIZE(action_options); j++ ) - if (!strncmp(action_options[j].name, argv[1], strlen(argv[1]))) + if (!strcmp(action_options[j].name, argv[1])) break; =20 if ( j =3D=3D ARRAY_SIZE(action_options) ) --=20 2.44.0 From nobody Sun May 19 07:16:26 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 24 Apr 2024 01:20:28 -0700 (PDT) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Anthony PERARD , Juergen Gross , Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini , Ross Lagerwall Subject: [PATCH v4 2/4] livepatch: introduce --force option Date: Wed, 24 Apr 2024 10:19:55 +0200 Message-ID: <20240424081957.34326-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240424081957.34326-1-roger.pau@citrix.com> References: <20240424081957.34326-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1713946867088100002 Introduce a xen-livepatch tool --force option, that's propagated into the hyerpvisor for livepatch operations. The intention is for the option to be used to bypass some checks that would otherwise prevent the patch from being loaded. Re purpose the pad field in xen_sysctl_livepatch_op to be a flags field that applies to all livepatch operations. The flag is currently only set by the hypercall wrappers for the XEN_SYSCTL_LIVEPATCH_UPLOAD operation, as that's= so far the only one where it will be used initially. Other uses can be added = as required. Note that helpers would set the .pad field to 0, that's been removed since = the structure is already zero initialized at definition. No functional usages of the new flag introduced in this patch. Signed-off-by: Roger Pau Monn=C3=A9 Acked-by: Jan Beulich Acked-by: Anthony PERARD --- Changes since v3: - Use strcmp instead of strncmp. Changes since v2: - New in this version. --- tools/include/xenctrl.h | 3 ++- tools/libs/ctrl/xc_misc.c | 7 +++---- tools/misc/xen-livepatch.c | 21 +++++++++++++++++++-- xen/common/livepatch.c | 3 ++- xen/include/public/sysctl.h | 4 +++- 5 files changed, 29 insertions(+), 9 deletions(-) diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h index 2ef8b4e05422..499685594427 100644 --- a/tools/include/xenctrl.h +++ b/tools/include/xenctrl.h @@ -2555,7 +2555,8 @@ int xc_psr_get_hw_info(xc_interface *xch, uint32_t so= cket, #endif =20 int xc_livepatch_upload(xc_interface *xch, - char *name, unsigned char *payload, uint32_t size); + char *name, unsigned char *payload, uint32_t size, + bool force); =20 int xc_livepatch_get(xc_interface *xch, char *name, diff --git a/tools/libs/ctrl/xc_misc.c b/tools/libs/ctrl/xc_misc.c index 5ecdfa2c7934..50282fd60dcc 100644 --- a/tools/libs/ctrl/xc_misc.c +++ b/tools/libs/ctrl/xc_misc.c @@ -576,7 +576,8 @@ int xc_getcpuinfo(xc_interface *xch, int max_cpus, int xc_livepatch_upload(xc_interface *xch, char *name, unsigned char *payload, - uint32_t size) + uint32_t size, + bool force) { int rc; struct xen_sysctl sysctl =3D {}; @@ -612,7 +613,7 @@ int xc_livepatch_upload(xc_interface *xch, =20 sysctl.cmd =3D XEN_SYSCTL_livepatch_op; sysctl.u.livepatch.cmd =3D XEN_SYSCTL_LIVEPATCH_UPLOAD; - sysctl.u.livepatch.pad =3D 0; + sysctl.u.livepatch.flags =3D force ? LIVEPATCH_FLAG_FORCE : 0; sysctl.u.livepatch.u.upload.size =3D size; set_xen_guest_handle(sysctl.u.livepatch.u.upload.payload, local); =20 @@ -656,7 +657,6 @@ int xc_livepatch_get(xc_interface *xch, =20 sysctl.cmd =3D XEN_SYSCTL_livepatch_op; sysctl.u.livepatch.cmd =3D XEN_SYSCTL_LIVEPATCH_GET; - sysctl.u.livepatch.pad =3D 0; =20 sysctl.u.livepatch.u.get.status.state =3D 0; sysctl.u.livepatch.u.get.status.rc =3D 0; @@ -985,7 +985,6 @@ static int _xc_livepatch_action(xc_interface *xch, =20 sysctl.cmd =3D XEN_SYSCTL_livepatch_op; sysctl.u.livepatch.cmd =3D XEN_SYSCTL_LIVEPATCH_ACTION; - sysctl.u.livepatch.pad =3D 0; sysctl.u.livepatch.u.action.cmd =3D action; sysctl.u.livepatch.u.action.timeout =3D timeout; sysctl.u.livepatch.u.action.flags =3D flags; diff --git a/tools/misc/xen-livepatch.c b/tools/misc/xen-livepatch.c index 2c4f69e596fa..c16fb6862d6c 100644 --- a/tools/misc/xen-livepatch.c +++ b/tools/misc/xen-livepatch.c @@ -19,11 +19,15 @@ =20 static xc_interface *xch; =20 +/* Global option to disable checks. */ +static bool force; + void show_help(void) { fprintf(stderr, "xen-livepatch: live patching tool\n" - "Usage: xen-livepatch [args] [command-flags]\n" + "Usage: xen-livepatch [--force] [args] [command-flag= s]\n" + " Use --force option to bypass some checks.\n" " An unique name of payload. Up to %d characters.\n" "Commands:\n" " help display this help\n" @@ -240,7 +244,7 @@ static int upload_func(int argc, char *argv[]) return saved_errno; } printf("Uploading %s... ", filename); - rc =3D xc_livepatch_upload(xch, name, fbuf, len); + rc =3D xc_livepatch_upload(xch, name, fbuf, len, force); if ( rc ) { rc =3D errno; @@ -571,6 +575,19 @@ int main(int argc, char *argv[]) show_help(); return 0; } + + if ( strcmp("--force", argv[1]) ) + { + if ( argc <=3D 2 ) + { + show_help(); + return EXIT_FAILURE; + } + force =3D true; + argv++; + argc--; + } + for ( i =3D 0; i < ARRAY_SIZE(main_options); i++ ) if (!strcmp(main_options[i].name, argv[1])) break; diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c index 351a3e0b9a60..502e264bc6fe 100644 --- a/xen/common/livepatch.c +++ b/xen/common/livepatch.c @@ -2125,7 +2125,8 @@ int livepatch_op(struct xen_sysctl_livepatch_op *live= patch) { int rc; =20 - if ( livepatch->pad ) + if ( (livepatch->flags & ~LIVEPATCH_FLAGS_MASK) && + !(livepatch->flags & LIVEPATCH_FLAG_FORCE) ) return -EINVAL; =20 switch ( livepatch->cmd ) diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h index 9b19679caeb1..febaa4b16ab7 100644 --- a/xen/include/public/sysctl.h +++ b/xen/include/public/sysctl.h @@ -1139,7 +1139,9 @@ struct xen_sysctl_livepatch_action { =20 struct xen_sysctl_livepatch_op { uint32_t cmd; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1713946863269100002 Livepatch payloads containing symbols that belong to init sections can only lead to page faults later on, as by the time the livepatch is loaded init sections have already been freed. Refuse to resolve such symbols and return an error instead. Note such resolutions are only relevant for symbols that point to undefined sections (SHN_UNDEF), as that implies the symbol is not in the current payl= oad and hence must either be a Xen or a different livepatch payload symbol. Do not allow to resolve symbols that point to __init_begin, as that address= is also unmapped. On the other hand, __init_end is not unmapped, and hence al= low resolutions against it. Since __init_begin can alias other symbols (like _erodata for example) allow the force flag to override the check and resolve the symbol anyway. Signed-off-by: Roger Pau Monn=C3=A9 --- Changes since v3: - Print warning message even when using the force option. Changes since v2: - Allow bypassing added check with the force flag. Changes since v1: - Fix off-by-one in range checking. --- xen/common/livepatch.c | 13 ++++++++----- xen/common/livepatch_elf.c | 22 +++++++++++++++++++++- xen/include/xen/livepatch_elf.h | 2 +- 3 files changed, 30 insertions(+), 7 deletions(-) diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c index 502e264bc6fe..1afde0281402 100644 --- a/xen/common/livepatch.c +++ b/xen/common/livepatch.c @@ -1080,7 +1080,8 @@ static void free_payload(struct payload *data) xfree(data); } =20 -static int load_payload_data(struct payload *payload, void *raw, size_t le= n) +static int load_payload_data(struct payload *payload, void *raw, size_t le= n, + bool force) { struct livepatch_elf elf =3D { .name =3D payload->name, .len =3D len }; int rc =3D 0; @@ -1093,7 +1094,7 @@ static int load_payload_data(struct payload *payload,= void *raw, size_t len) if ( rc ) goto out; =20 - rc =3D livepatch_elf_resolve_symbols(&elf); + rc =3D livepatch_elf_resolve_symbols(&elf, force); if ( rc ) goto out; =20 @@ -1133,7 +1134,8 @@ static int load_payload_data(struct payload *payload,= void *raw, size_t len) return rc; } =20 -static int livepatch_upload(struct xen_sysctl_livepatch_upload *upload) +static int livepatch_upload(struct xen_sysctl_livepatch_upload *upload, + bool force) { struct payload *data, *found; char n[XEN_LIVEPATCH_NAME_SIZE]; @@ -1162,7 +1164,7 @@ static int livepatch_upload(struct xen_sysctl_livepat= ch_upload *upload) { memcpy(data->name, n, strlen(n)); =20 - rc =3D load_payload_data(data, raw_data, upload->size); + rc =3D load_payload_data(data, raw_data, upload->size, force); if ( rc ) goto out; =20 @@ -2132,7 +2134,8 @@ int livepatch_op(struct xen_sysctl_livepatch_op *live= patch) switch ( livepatch->cmd ) { case XEN_SYSCTL_LIVEPATCH_UPLOAD: - rc =3D livepatch_upload(&livepatch->u.upload); + rc =3D livepatch_upload(&livepatch->u.upload, + livepatch->flags & LIVEPATCH_FLAG_FORCE); break; =20 case XEN_SYSCTL_LIVEPATCH_GET: diff --git a/xen/common/livepatch_elf.c b/xen/common/livepatch_elf.c index 45d73912a3cd..1d0ed8f99bcc 100644 --- a/xen/common/livepatch_elf.c +++ b/xen/common/livepatch_elf.c @@ -4,6 +4,7 @@ =20 #include #include +#include #include #include #include @@ -276,7 +277,7 @@ static int elf_get_sym(struct livepatch_elf *elf, const= void *data) return 0; } =20 -int livepatch_elf_resolve_symbols(struct livepatch_elf *elf) +int livepatch_elf_resolve_symbols(struct livepatch_elf *elf, bool force) { unsigned int i; int rc =3D 0; @@ -310,6 +311,25 @@ int livepatch_elf_resolve_symbols(struct livepatch_elf= *elf) break; } } + + /* + * Ensure not an init symbol. Only applicable to Xen symbols,= as + * livepatch payloads don't have init sections or equivalent. + */ + else if ( st_value >=3D (uintptr_t)&__init_begin && + st_value < (uintptr_t)&__init_end ) + { + printk("%s" LIVEPATCH "%s: symbol %s is in init section%s\= n", + force ? XENLOG_WARNING : XENLOG_ERR, + elf->name, elf->sym[i].name, + force ? "" : ", not resolving"); + if ( !force ) + { + rc =3D -ENXIO; + break; + } + } + dprintk(XENLOG_DEBUG, LIVEPATCH "%s: Undefined symbol resolved= : %s =3D> %#"PRIxElfAddr"\n", elf->name, elf->sym[i].name, st_value); break; diff --git a/xen/include/xen/livepatch_elf.h b/xen/include/xen/livepatch_el= f.h index 7116deaddc28..84e9c5eb7be5 100644 --- a/xen/include/xen/livepatch_elf.h +++ b/xen/include/xen/livepatch_elf.h @@ -44,7 +44,7 @@ livepatch_elf_sec_by_name(const struct livepatch_elf *elf, int livepatch_elf_load(struct livepatch_elf *elf, const void *data); void livepatch_elf_free(struct livepatch_elf *elf); =20 -int livepatch_elf_resolve_symbols(struct livepatch_elf *elf); +int livepatch_elf_resolve_symbols(struct livepatch_elf *elf, bool force); int livepatch_elf_perform_relocs(struct livepatch_elf *elf); =20 static inline bool livepatch_elf_ignore_section(const Elf_Shdr *sec) --=20 2.44.0 From nobody Sun May 19 07:16:26 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 24 Apr 2024 01:20:33 -0700 (PDT) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper , Ross Lagerwall Subject: [PATCH v4 4/4] x86/livepatch: perform sanity checks on the payload exception table contents Date: Wed, 24 Apr 2024 10:19:57 +0200 Message-ID: <20240424081957.34326-5-roger.pau@citrix.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240424081957.34326-1-roger.pau@citrix.com> References: <20240424081957.34326-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1713946863251100001 Ensure the entries of a payload exception table only apply to text regions = in the payload itself. Since the payload exception table needs to be loaded a= nd active even before a patch is applied (because hooks might already rely on = it), make sure the exception table (if any) only contains fixups for the payload text section. Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- Changes since v3: - Rename to extable_in_bounds(). - Use _p() instead of casting to void *. Changes since v2: - New in this version. --- xen/arch/x86/extable.c | 18 ++++++++++++++++++ xen/arch/x86/include/asm/uaccess.h | 3 +++ xen/common/livepatch.c | 9 +++++++++ 3 files changed, 30 insertions(+) diff --git a/xen/arch/x86/extable.c b/xen/arch/x86/extable.c index 8415cd1fa249..2be090b92df8 100644 --- a/xen/arch/x86/extable.c +++ b/xen/arch/x86/extable.c @@ -228,3 +228,21 @@ unsigned long asmlinkage search_pre_exception_table(st= ruct cpu_user_regs *regs) } return fixup; } + +#ifdef CONFIG_LIVEPATCH +bool extable_in_bounds(const struct exception_table_entry *ex_start, + const struct exception_table_entry *ex_end, + const void *start, const void *end) +{ + for ( ; ex_start < ex_end; ex_start++ ) + { + const void *addr =3D _p(ex_addr(ex_start)); + const void *cont =3D _p(ex_cont(ex_start)); + + if ( addr < start || addr >=3D end || cont < start || cont >=3D en= d ) + return false; + } + + return true; +} +#endif diff --git a/xen/arch/x86/include/asm/uaccess.h b/xen/arch/x86/include/asm/= uaccess.h index 48b684c19d44..4995edfdd8db 100644 --- a/xen/arch/x86/include/asm/uaccess.h +++ b/xen/arch/x86/include/asm/uaccess.h @@ -426,5 +426,8 @@ extern unsigned long search_exception_table(const struc= t cpu_user_regs *regs, extern void sort_exception_tables(void); extern void sort_exception_table(struct exception_table_entry *start, const struct exception_table_entry *stop); +extern bool extable_in_bounds(const struct exception_table_entry *ex_start, + const struct exception_table_entry *ex_end, + const void *start, const void *end); =20 #endif /* __X86_UACCESS_H__ */ diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c index 1afde0281402..4702c06902a9 100644 --- a/xen/common/livepatch.c +++ b/xen/common/livepatch.c @@ -912,6 +912,15 @@ static int prepare_payload(struct payload *payload, s =3D sec->load_addr; e =3D sec->load_addr + sec->sec->sh_size; =20 + if ( !extable_in_bounds(s, e, payload->text_addr, + payload->text_addr + payload->text_size) ) + { + printk(XENLOG_ERR LIVEPATCH + "%s: Invalid exception table with out of bounds entries= \n", + elf->name); + return -EINVAL; + } + sort_exception_table(s ,e); =20 region->ex =3D s; --=20 2.44.0