Re: [PATCH v8 2/6] x86/signal: Introduce helpers to get the maximum signal frame size
From: Borislav Petkov <bp@alien8.de>
Date: 2021-05-03 13:06:17
Also in:
linux-arch, lkml
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.
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