From: Borislav Petkov <bp@alien8.de>
To: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: bp@suse.de, 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
Subject: Re: [PATCH v8 2/6] x86/signal: Introduce helpers to get the maximum signal frame size
Date: Mon, 3 May 2021 15:06:07 +0200 [thread overview]
Message-ID: <YI/1P1fBix5HWBki@zn.tnic> (raw)
In-Reply-To: <20210422044856.27250-3-chang.seok.bae@intel.com>
On Wed, Apr 21, 2021 at 09:48:52PM -0700, Chang S. Bae wrote:
> +void __init init_sigframe_size(void)
> +{
> + max_frame_size = MAX_FRAME_SIGINFO_UCTXT_SIZE + MAX_FRAME_PADDING;
> +
> + max_frame_size += fpu__get_fpstate_size() + MAX_XSAVE_PADDING;
> +
> + /* Userspace expects an aligned size. */
> + max_frame_size = round_up(max_frame_size, FRAME_ALIGNMENT);
I guess we want
pr_info("max sigframe size: %lu\n", max_frame_size);
here so that we can keep an eye on how much this becomes, in practice.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-05-03 13:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 4:48 [PATCH v8 0/6] Improve Minimum Alternate Stack Size Chang S. Bae
2021-04-22 4:48 ` [PATCH v8 1/6] uapi: Define the aux vector AT_MINSIGSTKSZ Chang S. Bae
2021-04-22 4:48 ` [PATCH v8 2/6] x86/signal: Introduce helpers to get the maximum signal frame size Chang S. Bae
2021-05-03 13:06 ` Borislav Petkov [this message]
2021-04-22 4:48 ` [PATCH v8 3/6] x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ Chang S. Bae
2021-04-22 4:48 ` [PATCH v8 4/6] selftest/sigaltstack: Use the AT_MINSIGSTKSZ aux vector if available Chang S. Bae
2021-04-22 4:48 ` [PATCH v8 5/6] x86/signal: Detect and prevent an alternate signal stack overflow Chang S. Bae
2021-04-22 8:46 ` David Laight
2021-04-22 16:31 ` Bae, Chang Seok
2021-04-22 22:04 ` David Laight
2021-05-18 20:53 ` Bae, Chang Seok
2021-05-11 18:36 ` Borislav Petkov
2021-05-12 18:48 ` Bae, Chang Seok
2021-05-12 20:55 ` Thomas Gleixner
2021-05-14 7:26 ` Borislav Petkov
2021-04-22 4:48 ` [PATCH v8 6/6] selftest/x86/signal: Include test cases for validating sigaltstack Chang S. Bae
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