lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 24 Aug 2020 17:25:38 -0700 From: Yu-cheng Yu <yu-cheng.yu@...el.com> To: x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, linux-mm@...ck.org, linux-arch@...r.kernel.org, linux-api@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>, Balbir Singh <bsingharora@...il.com>, Borislav Petkov <bp@...en8.de>, Cyrill Gorcunov <gorcunov@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Eugene Syromiatnikov <esyr@...hat.com>, Florian Weimer <fweimer@...hat.com>, "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Mike Kravetz <mike.kravetz@...cle.com>, Nadav Amit <nadav.amit@...il.com>, Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, "Ravi V. Shankar" <ravi.v.shankar@...el.com>, Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>, Dave Martin <Dave.Martin@....com>, Weijiang Yang <weijiang.yang@...el.com> Cc: Yu-cheng Yu <yu-cheng.yu@...el.com>, Mark Brown <broonie@...nel.org>, Catalin Marinas <catalin.marinas@....com> Subject: [PATCH v11 23/25] ELF: Introduce arch_setup_elf_property() An ELF file's .note.gnu.property indicates arch features supported by the file. These features are extracted by arch_parse_elf_property() and stored in 'arch_elf_state'. Introduce arch_setup_elf_property() for enabling such features. The first use-case of this function is shadow stack. ARM64 is the other arch that has ARCH_USER_GNU_PROPERTY and arch_parse_elf_ property(). Add arch_setup_elf_property() for it. Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com> Cc: Mark Brown <broonie@...nel.org> Cc: Catalin Marinas <catalin.marinas@....com> Cc: Dave Martin <Dave.Martin@....com> --- v11: - Combine three patches of arch_setup_elf_property() into one. - Add empty arch_setup_elf_property() for arm64. v9: - Change cpu_feature_enabled() to static_cpu_has(). arch/arm64/include/asm/elf.h | 5 +++++ arch/x86/Kconfig | 2 ++ arch/x86/include/asm/elf.h | 13 +++++++++++++ arch/x86/kernel/process_64.c | 32 ++++++++++++++++++++++++++++++++ fs/binfmt_elf.c | 4 ++++ include/linux/elf.h | 6 ++++++ 6 files changed, 62 insertions(+) diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 8d1c8dcb87fd..d37bc7915935 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -281,6 +281,11 @@ static inline int arch_parse_elf_property(u32 type, const void *data, return 0; } +static inline int arch_setup_elf_property(struct arch_elf_state *arch) +{ + return 0; +} + static inline int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *f, bool is_interp, struct arch_elf_state *state) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e93be385cd04..6b6dad011763 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1950,6 +1950,8 @@ config X86_INTEL_SHADOW_STACK_USER select X86_INTEL_CET select ARCH_MAYBE_MKWRITE select ARCH_HAS_SHADOW_STACK + select ARCH_USE_GNU_PROPERTY + select ARCH_BINFMT_ELF_STATE help Shadow Stacks provides protection against program stack corruption. It's a hardware feature. This only matters diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index b9a5d488f1a5..0e1be2a13359 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -385,6 +385,19 @@ extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp); #define compat_arch_setup_additional_pages compat_arch_setup_additional_pages +#ifdef CONFIG_ARCH_BINFMT_ELF_STATE +struct arch_elf_state { + unsigned int gnu_property; +}; + +#define INIT_ARCH_ELF_STATE { \ + .gnu_property = 0, \ +} + +#define arch_elf_pt_proc(ehdr, phdr, elf, interp, state) (0) +#define arch_check_elf(ehdr, interp, interp_ehdr, state) (0) +#endif + /* Do not change the values. See get_align_mask() */ enum align_flags { ALIGN_VA_32 = BIT(0), diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 9afefe325acb..fd4644865a3b 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -837,3 +837,35 @@ unsigned long KSTK_ESP(struct task_struct *task) { return task_pt_regs(task)->sp; } + +#ifdef CONFIG_ARCH_USE_GNU_PROPERTY +int arch_parse_elf_property(u32 type, const void *data, size_t datasz, + bool compat, struct arch_elf_state *state) +{ + if (type != GNU_PROPERTY_X86_FEATURE_1_AND) + return 0; + + if (datasz != sizeof(unsigned int)) + return -ENOEXEC; + + state->gnu_property = *(unsigned int *)data; + return 0; +} + +int arch_setup_elf_property(struct arch_elf_state *state) +{ + int r = 0; + + if (!IS_ENABLED(CONFIG_X86_INTEL_CET)) + return r; + + memset(¤t->thread.cet, 0, sizeof(struct cet_status)); + + if (static_cpu_has(X86_FEATURE_SHSTK)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_SHSTK) + r = cet_setup_shstk(); + } + + return r; +} +#endif diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 13d053982dd7..2b4cfc256895 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1217,6 +1217,10 @@ static int load_elf_binary(struct linux_binprm *bprm) set_binfmt(&elf_format); + retval = arch_setup_elf_property(&arch_state); + if (retval < 0) + goto out; + #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES retval = arch_setup_additional_pages(bprm, !!interpreter); if (retval < 0) diff --git a/include/linux/elf.h b/include/linux/elf.h index 5d5b0321da0b..4827695ca415 100644 --- a/include/linux/elf.h +++ b/include/linux/elf.h @@ -82,9 +82,15 @@ static inline int arch_parse_elf_property(u32 type, const void *data, { return 0; } + +static inline int arch_setup_elf_property(struct arch_elf_state *arch) +{ + return 0; +} #else extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz, bool compat, struct arch_elf_state *arch); +extern int arch_setup_elf_property(struct arch_elf_state *arch); #endif #ifdef CONFIG_ARCH_HAVE_ELF_PROT -- 2.21.0
Powered by blists - more mailing lists