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Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang Cc: Yu-cheng Yu , Catalin Marinas , Mark Brown Subject: [PATCH v27 27/31] ELF: Introduce arch_setup_elf_property() Date: Fri, 21 May 2021 15:12:07 -0700 Message-Id: <20210521221211.29077-28-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210521221211.29077-1-yu-cheng.yu@intel.com> References: <20210521221211.29077-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Authentication-Results: imf07.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none); spf=none (imf07.hostedemail.com: domain of yu-cheng.yu@intel.com has no SPF policy when checking 134.134.136.65) smtp.mailfrom=yu-cheng.yu@intel.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 9F9C5A0001C9 X-Stat-Signature: i3bnpkdh3poksy73r771edea45gkehag X-HE-Tag: 1621635217-218796 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: An ELF file's .note.gnu.property indicates arch features supported by the file. These features are extracted by arch_parse_elf_property() and stor= ed in 'arch_elf_state'. Introduce x86 feature definitions and arch_setup_elf_property(), which enables such features. The first use-case of this function is Shadow Stack. ARM64 is the other arch that has ARCH_USE_GNU_PROPERTY and arch_parse_elf= _ property(). Add arch_setup_elf_property() for it. Signed-off-by: Yu-cheng Yu Cc: Catalin Marinas Cc: Dave Martin Cc: Kees Cook Cc: Mark Brown --- v27: - Make X86_64 select ARCH_USE_GNU_PROPERTY and ARCH_BINFMT_ELF_STATE and remove #ifdef's. - Add link to x86-64-psABI document. arch/arm64/include/asm/elf.h | 5 +++++ arch/x86/Kconfig | 2 ++ arch/x86/include/asm/elf.h | 11 +++++++++++ arch/x86/kernel/process_64.c | 29 +++++++++++++++++++++++++++++ fs/binfmt_elf.c | 4 ++++ include/linux/elf.h | 6 ++++++ include/uapi/linux/elf.h | 14 ++++++++++++++ 7 files changed, 71 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; } =20 +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 36309425d612..af1a096ed023 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -29,6 +29,7 @@ config X86_64 select ARCH_HAS_SHADOW_STACK select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 select ARCH_USE_CMPXCHG_LOCKREF + select ARCH_USE_GNU_PROPERTY select HAVE_ARCH_SOFT_DIRTY select MODULES_USE_ELF_RELA select NEED_DMA_MAP_STATE @@ -60,6 +61,7 @@ config X86 select ACPI_LEGACY_TABLES_LOOKUP if ACPI select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ARCH_32BIT_OFF_T if X86_32 + select ARCH_BINFMT_ELF_STATE select ARCH_CLOCKSOURCE_INIT select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGR= ATION select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM) diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 7d7500806af8..2fe94efe1c0c 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -390,6 +390,17 @@ extern int compat_arch_setup_additional_pages(struct= linux_binprm *bprm, =20 extern bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs); =20 +struct arch_elf_state { + unsigned int gnu_property; +}; + +#define INIT_ARCH_ELF_STATE { \ + .gnu_property =3D 0, \ +} + +#define arch_elf_pt_proc(ehdr, phdr, elf, interp, state) (0) +#define arch_check_elf(ehdr, interp, interp_ehdr, state) (0) + /* Do not change the values. See get_align_mask() */ enum align_flags { ALIGN_VA_32 =3D BIT(0), diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index d08307df69ad..1742c16945ef 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -835,3 +835,32 @@ unsigned long KSTK_ESP(struct task_struct *task) { return task_pt_regs(task)->sp; } + +int arch_parse_elf_property(u32 type, const void *data, size_t datasz, + bool compat, struct arch_elf_state *state) +{ + if (type !=3D GNU_PROPERTY_X86_FEATURE_1_AND) + return 0; + + if (datasz !=3D sizeof(unsigned int)) + return -ENOEXEC; + + state->gnu_property =3D *(unsigned int *)data; + return 0; +} + +int arch_setup_elf_property(struct arch_elf_state *state) +{ + int r =3D 0; + +#ifdef CONFIG_X86_SHADOW_STACK + memset(¤t->thread.shstk, 0, sizeof(struct thread_shstk)); + + if (cpu_feature_enabled(X86_FEATURE_SHSTK)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_SHSTK) + r =3D shstk_setup(); + } +#endif + + return r; +} diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 187b3f2b9202..73ab9b5d3a4c 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1248,6 +1248,10 @@ static int load_elf_binary(struct linux_binprm *bp= rm) =20 set_binfmt(&elf_format); =20 + retval =3D arch_setup_elf_property(&arch_state); + if (retval < 0) + goto out; + #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES retval =3D ARCH_SETUP_ADDITIONAL_PAGES(bprm, elf_ex, !!interpreter); if (retval < 0) diff --git a/include/linux/elf.h b/include/linux/elf.h index c9a46c4e183b..be04d15e937f 100644 --- a/include/linux/elf.h +++ b/include/linux/elf.h @@ -92,9 +92,15 @@ static inline int arch_parse_elf_property(u32 type, co= nst 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 da= tasz, bool compat, struct arch_elf_state *arch); +extern int arch_setup_elf_property(struct arch_elf_state *arch); #endif =20 #ifdef CONFIG_ARCH_HAVE_ELF_PROT diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index 61bf4774b8f2..f50b3ce7bb75 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -456,4 +456,18 @@ typedef struct elf64_note { /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */ #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1U << 0) =20 +/* + * See the x86 64 psABI at: + * https://gitlab.com/x86-psABIs/x86-64-ABI/-/wikis/x86-64-psABI + * .note.gnu.property types for x86: + */ +/* 0xc0000000 and 0xc0000001 are reserved */ +#define GNU_PROPERTY_X86_FEATURE_1_AND 0xc0000002 + +/* Bits for GNU_PROPERTY_X86_FEATURE_1_AND */ +#define GNU_PROPERTY_X86_FEATURE_1_IBT 0x00000001 +#define GNU_PROPERTY_X86_FEATURE_1_SHSTK 0x00000002 +#define GNU_PROPERTY_X86_FEATURE_1_VALID (GNU_PROPERTY_X86_FEATURE_1_IBT= | \ + GNU_PROPERTY_X86_FEATURE_1_SHSTK) + #endif /* _UAPI_LINUX_ELF_H */ --=20 2.21.0