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authorEric Biggers <ebiggers@google.com>2017-09-24 12:59:07 +0200
committerIngo Molnar <mingo@kernel.org>2017-09-26 09:43:46 +0200
commit80d8ae86b36791a545ca28ddc95133ea59bba6e0 (patch)
tree2b1b3224513045f7245a2640deb74a8d45abca02 /arch
parentb11e2e18a7fc8eaa3d592c260d50c7129e094ded (diff)
downloadlinux-80d8ae86b36791a545ca28ddc95133ea59bba6e0.tar.bz2
x86/fpu: Copy the full state_header in copy_kernel_to_xstate()
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/fpu/xstate.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 2427aeea33b5..02591b96bb25 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -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: