From: Borislav Petkov <bp@suse.de>
To: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: tglx@linutronix.de, mingo@kernel.org, luto@kernel.org,
x86@kernel.org, len.brown@intel.com, dave.hansen@intel.com,
hjl.tools@gmail.com, Dave.Martin@arm.com, jannh@google.com,
mpe@ellerman.id.au, carlos@redhat.com, tony.luck@intel.com,
ravi.v.shankar@intel.com, libc-alpha@sourceware.org,
linux-arch@vger.kernel.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 1/6] uapi: Define the aux vector AT_MINSIGSTKSZ
Date: Mon, 1 Mar 2021 20:09:09 +0100 [thread overview]
Message-ID: <20210301190909.GF32622@zn.tnic> (raw)
In-Reply-To: <20210227165911.32757-2-chang.seok.bae@intel.com>
On Sat, Feb 27, 2021 at 08:59:06AM -0800, Chang S. Bae wrote:
> Define the AT_MINSIGSTKSZ in generic Linux. It is already used as generic
> ABI in glibc's generic elf.h, and this define will prevent future namespace
> conflicts. In particular, x86 is also using this generic definition.
>
> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
> Reviewed-by: Len Brown <len.brown@intel.com>
> Cc: Carlos O'Donell <carlos@redhat.com>
> Cc: Dave Martin <Dave.Martin@arm.com>
> Cc: libc-alpha@sourceware.org
> Cc: linux-arch@vger.kernel.org
> Cc: linux-api@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> ---
> Change from v5:
> * Reverted the arm64 change. (Dave Martin)
> * Massaged the changelog.
>
> Change from v4:
> * Added as a new patch (Carlos O'Donell)
> ---
> include/uapi/linux/auxvec.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/include/uapi/linux/auxvec.h b/include/uapi/linux/auxvec.h
> index abe5f2b6581b..15be98c75174 100644
> --- a/include/uapi/linux/auxvec.h
> +++ b/include/uapi/linux/auxvec.h
> @@ -33,5 +33,8 @@
>
> #define AT_EXECFN 31 /* filename of program */
>
> +#ifndef AT_MINSIGSTKSZ
> +#define AT_MINSIGSTKSZ 51 /* stack needed for signal delivery */
I know glibc's comment says a similar thing but the correct thing to say
here should be "minimal stack size for signal delivery" or so. Even the
variable name alludes to that too.
--
Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg
next prev parent reply other threads:[~2021-03-01 19:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-27 16:59 [PATCH v6 0/6] x86: Improve Minimum Alternate Stack Size Chang S. Bae
2021-02-27 16:59 ` [PATCH v6 1/6] uapi: Define the aux vector AT_MINSIGSTKSZ Chang S. Bae
2021-03-01 19:09 ` Borislav Petkov [this message]
2021-03-10 16:31 ` Bae, Chang Seok
2021-02-27 16:59 ` [PATCH v6 2/6] x86/signal: Introduce helpers to get the maximum signal frame size Chang S. Bae
2021-02-27 16:59 ` [PATCH v6 3/6] x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ Chang S. Bae
2021-03-05 10:43 ` Borislav Petkov
2021-03-10 16:34 ` Bae, Chang Seok
2021-03-10 17:43 ` Borislav Petkov
2021-03-10 18:01 ` Bae, Chang Seok
2021-02-27 16:59 ` [PATCH v6 4/6] selftest/sigaltstack: Use the AT_MINSIGSTKSZ aux vector if available Chang S. Bae
2021-02-27 16:59 ` [PATCH v6 5/6] x86/signal: Detect and prevent an alternate signal stack overflow Chang S. Bae
2021-02-27 16:59 ` [PATCH v6 6/6] selftest/x86/signal: Include test cases for validating sigaltstack Chang S. Bae
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