From: Jarkko Sakkinen <jarkko@kernel.org>
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>,
Borislav Petkov <bp@alien8.de>,
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>
Subject: Re: [PATCH v24 9/9] x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave
Date: Sun, 4 Apr 2021 18:54:37 +0300 [thread overview]
Message-ID: <YGnhPc8USFh/AnqJ@kernel.org> (raw)
In-Reply-To: <20210401221403.32253-10-yu-cheng.yu@intel.com>
On Thu, Apr 01, 2021 at 03:14:03PM -0700, Yu-cheng Yu wrote:
> ENDBR is a special new instruction for the Indirect Branch Tracking (IBT)
> component of CET. IBT prevents attacks by ensuring that (most) indirect
> branches and function calls may only land at ENDBR instructions. Branches
> that don't follow the rules will result in control flow (#CF) exceptions.
>
> ENDBR is a noop when IBT is unsupported or disabled. Most ENDBR
> instructions are inserted automatically by the compiler, but branch
> targets written in assembly must have ENDBR added manually.
>
> Add ENDBR to __vdso_sgx_enter_enclave() branch targets.
>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
> Cc: Andy Lutomirski <luto@kernel.org>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Jarkko Sakkinen <jarkko@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
> ---
> arch/x86/entry/vdso/vsgx.S | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/x86/entry/vdso/vsgx.S b/arch/x86/entry/vdso/vsgx.S
> index 86a0e94f68df..c63eafa54abd 100644
> --- a/arch/x86/entry/vdso/vsgx.S
> +++ b/arch/x86/entry/vdso/vsgx.S
> @@ -4,6 +4,7 @@
> #include <asm/export.h>
> #include <asm/errno.h>
> #include <asm/enclu.h>
> +#include <asm/vdso.h>
>
> #include "extable.h"
>
> @@ -27,6 +28,7 @@
> SYM_FUNC_START(__vdso_sgx_enter_enclave)
> /* Prolog */
> .cfi_startproc
> + ENDBR
> push %rbp
> .cfi_adjust_cfa_offset 8
> .cfi_rel_offset %rbp, 0
> @@ -62,6 +64,7 @@ SYM_FUNC_START(__vdso_sgx_enter_enclave)
> .Lasync_exit_pointer:
> .Lenclu_eenter_eresume:
> enclu
> + ENDBR
>
> /* EEXIT jumps here unless the enclave is doing something fancy. */
> mov SGX_ENCLAVE_OFFSET_OF_RUN(%rbp), %rbx
> @@ -91,6 +94,7 @@ SYM_FUNC_START(__vdso_sgx_enter_enclave)
> jmp .Lout
>
> .Lhandle_exception:
> + ENDBR
> mov SGX_ENCLAVE_OFFSET_OF_RUN(%rbp), %rbx
>
> /* Set the exception info. */
> --
> 2.21.0
>
>
/Jarkko
next prev parent reply other threads:[~2021-04-04 15:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 22:13 [PATCH v24 0/9] Control-flow Enforcement: Indirect Branch Tracking Yu-cheng Yu
2021-04-01 22:13 ` [PATCH v24 1/9] x86/cet/ibt: Add Kconfig option for " Yu-cheng Yu
2021-04-01 22:13 ` [PATCH v24 2/9] x86/cet/ibt: Add user-mode Indirect Branch Tracking support Yu-cheng Yu
2021-04-01 22:13 ` [PATCH v24 3/9] x86/cet/ibt: Handle signals for Indirect Branch Tracking Yu-cheng Yu
2021-04-01 22:13 ` [PATCH v24 4/9] x86/cet/ibt: Update ELF header parsing " Yu-cheng Yu
2021-04-01 22:13 ` [PATCH v24 5/9] x86/cet/ibt: Update arch_prctl functions " Yu-cheng Yu
2021-04-01 22:14 ` [PATCH v24 6/9] x86/vdso: Insert endbr32/endbr64 to vDSO Yu-cheng Yu
2021-04-01 22:14 ` [PATCH v24 7/9] x86/vdso: Introduce ENDBR macro Yu-cheng Yu
2021-04-01 22:14 ` [PATCH v24 8/9] x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point Yu-cheng Yu
2021-04-01 22:14 ` [PATCH v24 9/9] x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave Yu-cheng Yu
2021-04-04 15:54 ` Jarkko Sakkinen [this message]
2021-05-24 18:51 ` Sean Christopherson
2021-05-24 19:01 ` Yu, Yu-cheng
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