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x86/fpu: Copy the full state_header in copy_kernel_to_xstate()

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This is in preparation to verify the full xstate header as supplied by user-space.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-5-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Eric Biggers 2017-09-24 12:59:07 +02:00 committed by Ingo Molnar
parent b11e2e18a7
commit 80d8ae86b3
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/fpu/xstate.c
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@ -1148,11 +1148,13 @@ int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
int i;
u64 xfeatures;
u64 allowed_features;
struct xstate_header hdr;
offset = offsetof(struct xregs_state, header);
size = sizeof(xfeatures);
size = sizeof(hdr);
memcpy(&xfeatures, kbuf + offset, size);
memcpy(&hdr, kbuf + offset, size);
xfeatures = hdr.xfeatures;
/*
* Reject if the user sets any disabled or supervisor features: