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From: Borislav Petkov <bp@alien8.de>
To: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	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 <arnd@arndb.de>,
	Andy Lutomirski <luto@kernel.org>,
	Balbir Singh <bsingharora@gmail.com>,
	Cyrill Gorcunov <gorcunov@gmail.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Eugene Syromiatnikov <esyr@redhat.com>,
	Florian Weimer <fweimer@redhat.com>,
	"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Kees Cook <keescook@chromium.org>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Nadav Amit <nadav.amit@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
	Peter Zijlstra <peterz@infradead.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
	Dave Martin <Dave.Martin@arm.com>,
	Weijiang Yang <weijiang.yang@intel.com>,
	Pengfei Xu <pengfei.xu@intel.com>,
	Haitao Huang <haitao.huang@intel.com>,
	Mark Brown <broonie@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property()
Date: Wed, 19 May 2021 20:10:11 +0200	[thread overview]
Message-ID: <YKVUgzJ0MVNBgjDd@zn.tnic> (raw)
In-Reply-To: <20210427204315.24153-27-yu-cheng.yu@intel.com>

On Tue, Apr 27, 2021 at 01:43:11PM -0700, Yu-cheng Yu wrote:
> @@ -1951,6 +1951,8 @@ config X86_SHADOW_STACK
>  	depends on AS_WRUSS
>  	depends on ARCH_HAS_SHADOW_STACK
>  	select ARCH_USES_HIGH_VMA_FLAGS
> +	select ARCH_USE_GNU_PROPERTY
> +	select ARCH_BINFMT_ELF_STATE
		^^^^^^^^

What's that for? Isn't ARCH_USE_GNU_PROPERTY enough?

> +int arch_setup_elf_property(struct arch_elf_state *state)
> +{
> +	int r = 0;
> +
> +	if (!IS_ENABLED(CONFIG_X86_SHADOW_STACK))
> +		return r;
> +
> +	memset(&current->thread.cet, 0, sizeof(struct cet_status));
> +
> +	if (static_cpu_has(X86_FEATURE_SHSTK)) {

	cpu_feature_enabled

> +		if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
> +			r = shstk_setup();
> +	}
> +
> +	return r;
> +}
> +#endif

...

> diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
> index 30f68b42eeb5..24ba55ba8278 100644
> --- a/include/uapi/linux/elf.h
> +++ b/include/uapi/linux/elf.h
> @@ -455,4 +455,13 @@ typedef struct elf64_note {
>  /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
>  #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI	(1U << 0)
>  
> +/* .note.gnu.property types for x86: */
> +#define GNU_PROPERTY_X86_FEATURE_1_AND		0xc0000002

Why not 0xc0000001? ARM64 is 0xc0000000...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2021-05-19 18:10 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-27 20:42 [PATCH v26 00/30] Control-flow Enforcement: Shadow Stack Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 01/30] Documentation/x86: Add CET description Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 02/30] x86/cet/shstk: Add Kconfig option for Shadow Stack Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 03/30] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 04/30] x86/cpufeatures: Introduce CPU setup and option parsing for CET Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 05/30] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 06/30] x86/cet: Add control-protection fault handler Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 07/30] x86/mm: Remove _PAGE_DIRTY from kernel RO pages Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 08/30] x86/mm: Move pmd_write(), pud_write() up in the file Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 09/30] x86/mm: Introduce _PAGE_COW Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 10/30] drm/i915/gvt: Change _PAGE_DIRTY to _PAGE_DIRTY_BITS Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 11/30] x86/mm: Update pte_modify for _PAGE_COW Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 12/30] x86/mm: Update ptep_set_wrprotect() and pmdp_set_wrprotect() for transition from _PAGE_DIRTY to _PAGE_COW Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 13/30] mm: Introduce VM_SHADOW_STACK for shadow stack memory Yu-cheng Yu
2021-04-27 20:42 ` [PATCH v26 14/30] x86/mm: Shadow Stack page fault error checking Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 15/30] x86/mm: Update maybe_mkwrite() for shadow stack Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 16/30] mm: Fixup places that call pte_mkwrite() directly Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 17/30] mm: Add guard pages around a shadow stack Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 18/30] mm/mmap: Add shadow stack pages to memory accounting Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 19/30] mm: Update can_follow_write_pte() for shadow stack Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 20/30] mm/mprotect: Exclude shadow stack from preserve_write Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 21/30] mm: Re-introduce vm_flags to do_mmap() Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support Yu-cheng Yu
2021-04-28 17:52   ` Borislav Petkov
2021-04-28 18:39     ` Yu, Yu-cheng
2021-04-29  9:12       ` Borislav Petkov
2021-04-29 16:17         ` Yu, Yu-cheng
2021-04-29 16:45           ` Borislav Petkov
2021-04-27 20:43 ` [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack Yu-cheng Yu
2021-05-10 14:15   ` Borislav Petkov
2021-05-10 22:57     ` Yu, Yu-cheng
2021-05-11 17:09       ` Borislav Petkov
2021-05-12  8:12         ` David Laight
2021-05-11 18:35     ` Yu, Yu-cheng
2021-05-12 15:56       ` Borislav Petkov
2021-04-27 20:43 ` [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines Yu-cheng Yu
2021-05-17  7:45   ` Borislav Petkov
2021-05-17 20:55     ` Yu, Yu-cheng
2021-05-18  0:14       ` Eugene Syromiatnikov
2021-05-18 17:58         ` Borislav Petkov
2021-05-18 19:45           ` Yu, Yu-cheng
2021-05-18 18:05         ` Yu, Yu-cheng
2021-05-18  5:56       ` Borislav Petkov
2021-05-21 16:17     ` Yu, Yu-cheng
2021-05-21 18:40       ` Borislav Petkov
2021-04-27 20:43 ` [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack Yu-cheng Yu
2021-04-28 23:03   ` extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) Andy Lutomirski
2021-04-28 23:20     ` Yu, Yu-cheng
2021-04-29  7:28     ` Cyrill Gorcunov
2021-04-29 14:44       ` Andy Lutomirski
2021-04-29 15:35         ` Cyrill Gorcunov
2021-04-30  6:45     ` Florian Weimer
2021-04-30 17:00     ` Yu, Yu-cheng
2021-04-30 17:47       ` Andy Lutomirski
2021-04-30 18:32         ` Yu, Yu-cheng
2021-05-04 20:49           ` Yu, Yu-cheng
2021-05-06 22:05             ` Yu, Yu-cheng
2021-05-06 23:31               ` Andy Lutomirski
2021-05-02 23:23         ` Andy Lutomirski
2021-05-03  6:03           ` H. Peter Anvin
2021-05-03 15:13           ` Yu, Yu-cheng
2021-05-03 15:29             ` Andy Lutomirski
2021-05-03 20:25               ` Yu, Yu-cheng
2021-04-27 20:43 ` [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() Yu-cheng Yu
2021-05-19 18:10   ` Borislav Petkov [this message]
2021-05-19 22:14     ` Yu, Yu-cheng
2021-05-20  9:26       ` Borislav Petkov
2021-05-20 17:18         ` Yu, Yu-cheng
2021-05-20 17:35           ` Borislav Petkov
2021-05-20 17:51             ` Yu, Yu-cheng
2021-05-20 17:38       ` Matthew Wilcox
2021-05-20 17:52         ` Yu, Yu-cheng
2021-05-20 21:06           ` Yu, Yu-cheng
2021-04-27 20:43 ` [PATCH v26 27/30] x86/cet/shstk: Add arch_prctl functions for shadow stack Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 28/30] mm: Move arch_calc_vm_prot_bits() to arch/x86/include/asm/mman.h Yu-cheng Yu
2021-04-27 20:43 ` [PATCH v26 29/30] mm: Update arch_validate_flags() to test vma anonymous Yu-cheng Yu
2021-05-11 11:35   ` Kirill A. Shutemov
2021-04-27 20:43 ` [PATCH v26 30/30] mm: Introduce PROT_SHADOW_STACK for shadow stack Yu-cheng Yu
2021-05-11 11:48   ` Kirill A. Shutemov
2021-05-11 14:44     ` Yu, Yu-cheng
2021-04-29 17:13 ` [PATCH v26 00/30] Control-flow Enforcement: Shadow Stack Borislav Petkov
2021-04-29 17:32   ` Yu, Yu-cheng
2021-04-29 17:49     ` Borislav Petkov

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