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Groups > linux.kernel > #1739713

[tip:x86/fpu] x86/fpu: Copy the full header in copy_user_to_xstate()

From tip-bot for Eric Biggers <tipbot@zytor.com>
Newsgroups linux.kernel
Subject [tip:x86/fpu] x86/fpu: Copy the full header in copy_user_to_xstate()
Date 2017-09-26 10:50 +0200
Message-ID <utTJ1-2nL-37@gated-at.bofh.it> (permalink)
References <utcXo-7Yz-11@gated-at.bofh.it>
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Commit-ID:  af2c4322d986a08a6e793b74b83a62b325019c20
Gitweb:     http://git.kernel.org/tip/af2c4322d986a08a6e793b74b83a62b325019c20
Author:     Eric Biggers <ebiggers@google.com>
AuthorDate: Sun, 24 Sep 2017 12:59:10 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 26 Sep 2017 09:43:47 +0200

x86/fpu: Copy the full header in copy_user_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/20170924105913.9157-8-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/fpu/xstate.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 325db78..0cd7b73 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1199,13 +1199,16 @@ int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf)
 	int i;
 	u64 xfeatures;
 	u64 allowed_features;
+	struct xstate_header hdr;
 
 	offset = offsetof(struct xregs_state, header);
-	size = sizeof(xfeatures);
+	size = sizeof(hdr);
 
-	if (__copy_from_user(&xfeatures, ubuf + offset, size))
+	if (__copy_from_user(&hdr, ubuf + offset, size))
 		return -EFAULT;
 
+	xfeatures = hdr.xfeatures;
+
 	/*
 	 * Reject if the user sets any disabled or supervisor features:
 	 */

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[PATCH 00/10] x86/fpu: Split up "x86/fpu: Tighten validation of user-supplied xstate_header" Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:00 +0200
  [PATCH 02/10] x86/fpu: Use validate_xstate_header() to validate the xstate_header in xstateregs_set() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:00 +0200
    [tip:x86/fpu] x86/fpu: Use validate_xstate_header() to validate the  xstate_header in xstateregs_set() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 09/10] x86/fpu: Use validate_xstate_header() to validate the xstate_header in copy_user_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:00 +0200
    [tip:x86/fpu] x86/fpu: Use validate_xstate_header() to validate the  xstate_header in copy_user_to_xstate() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 10/10] x86/fpu: Use using_compacted_format() instead of open coded X86_FEATURE_XSAVES Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    [tip:x86/fpu] x86/fpu: Use using_compacted_format() instead of open  coded X86_FEATURE_XSAVES tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate the xstate_header in sanitize_restored_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Eric Biggers <ebiggers3@gmail.com> - 2017-09-24 21:00 +0200
      Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 21:10 +0200
        Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Eric Biggers <ebiggers3@gmail.com> - 2017-09-24 22:10 +0200
          Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-25 08:10 +0200
          Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-25 08:20 +0200
            Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Eric Biggers <ebiggers3@gmail.com> - 2017-09-25 09:30 +0200
              Re: [PATCH 03/10] x86/fpu: Use validate_xstate_header() to validate  the xstate_header in sanitize_restored_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-25 09:40 +0200
    [tip:x86/fpu] x86/fpu: Use validate_xstate_header() to validate the  xstate_header in __fpu__restore_sig() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 07/10] x86/fpu: Copy the full header in copy_user_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    [tip:x86/fpu] x86/fpu: Copy the full header in  copy_user_to_xstate() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 01/10] x86/fpu: Introduce validate_xstate_header() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    [tip:x86/fpu] x86/fpu: Introduce validate_xstate_header() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 08/10] x86/fpu: Eliminate the 'xfeatures' local variable in copy_user_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    [tip:x86/fpu] x86/fpu: Eliminate the 'xfeatures' local variable in  copy_user_to_xstate() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 04/10] x86/fpu: Copy the full state_header in copy_kernel_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    [tip:x86/fpu] x86/fpu: Copy the full state_header in  copy_kernel_to_xstate() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  [PATCH 06/10] x86/fpu: Use validate_xstate_header() to validate the xstate_header in copy_kernel_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-24 13:10 +0200
    [tip:x86/fpu] x86/fpu: Use validate_xstate_header() to validate the  xstate_header in copy_kernel_to_xstate() tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
  Re: [PATCH 00/10] x86/fpu: Split up "x86/fpu: Tighten validation of  user-supplied xstate_header" Linus Torvalds <torvalds@linux-foundation.org> - 2017-09-24 20:10 +0200
    Re: [PATCH 00/10] x86/fpu: Split up "x86/fpu: Tighten validation of  user-supplied xstate_header" Ingo Molnar <mingo@kernel.org> - 2017-09-24 21:10 +0200
      Re: [RFC GIT PULL] x86 FPU fixes and cleanups Linus Torvalds <torvalds@linux-foundation.org> - 2017-09-26 20:20 +0200

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