From: Andy Lutomirski <luto@kernel.org>
To: Yu-cheng Yu <yu-cheng.yu@intel.com>,
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>,
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>,
Dave Martin <Dave.Martin@arm.com>,
Weijiang Yang <weijiang.yang@intel.com>,
Pengfei Xu <pengfei.xu@intel.com>,
Haitao Huang <haitao.huang@intel.com>,
Rick P Edgecombe <rick.p.edgecombe@intel.com>
Subject: Re: [PATCH v28 04/10] x86/cet/ibt: Disable IBT for ia32
Date: Mon, 9 Aug 2021 16:04:18 -0700 [thread overview]
Message-ID: <3318ca57-7ac3-8296-f9ae-0ae83d5f95dd@kernel.org> (raw)
In-Reply-To: <20210722205723.9476-5-yu-cheng.yu@intel.com>
On 7/22/21 1:57 PM, Yu-cheng Yu wrote:
> In a signal, a task's IBT status needs to be saved to the signal frame, and
> later restored in sigreturn. For the purpose, previous versions of the
> series add a new struct to the signal frame. However, a new signal frame
> format (or re-using a reserved space) introduces complex compatibility
> issues.
>
> In the discussion (see link below), Andy Lutomirski proposed using a
> ucontext flag. The approach is clean and eliminates most compatibility
> issues.
>
> However, a legacy IA32 signal frame does not have ucontext and cannot
> support a uc flag. Thus,
>
> - Disable IBT for ia32.
> - In ia32 sigreturn, verify ibt is disabled.
Acked-by: Andy Lutomirski <luto@kernel.org>
next prev parent reply other threads:[~2021-08-09 23:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-22 20:57 [PATCH v28 00/10] Control-flow Enforcement: Indirect Branch Tracking Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 01/10] x86/cet/ibt: Add Kconfig option for " Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 02/10] x86/cet/ibt: Add user-mode Indirect Branch Tracking support Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 03/10] x86/cet/ibt: Handle signals for Indirect Branch Tracking Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 04/10] x86/cet/ibt: Disable IBT for ia32 Yu-cheng Yu
2021-08-09 23:04 ` Andy Lutomirski [this message]
2021-08-10 16:07 ` Yu, Yu-cheng
2021-07-22 20:57 ` [PATCH v28 05/10] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 06/10] x86/cet/ibt: Update arch_prctl functions " Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 07/10] x86/vdso: Insert endbr32/endbr64 to vDSO Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 08/10] x86/vdso: Introduce ENDBR macro Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 09/10] x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point Yu-cheng Yu
2021-07-22 20:57 ` [PATCH v28 10/10] x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave Yu-cheng Yu
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