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| author | Brian Gerst <brgerst@gmail.com> | 2015-07-19 21:09:05 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-07-21 09:12:23 +0200 |
| commit | df1ae9a5dc66d9fd57109240042372b1065d984a (patch) | |
| tree | c14e5d065f2fae8c8b6df252761dfe7e7313b332 /arch | |
| parent | 0233606ce5cf12c1a0e27cb197066ea5bc2bb488 (diff) | |
| download | linux-stable-df1ae9a5dc66d9fd57109240042372b1065d984a.tar.gz linux-stable-df1ae9a5dc66d9fd57109240042372b1065d984a.tar.bz2 linux-stable-df1ae9a5dc66d9fd57109240042372b1065d984a.zip | |
x86/entry/vm86: Preserve 'orig_ax'
There is no legitimate reason for usermode to modify the 'orig_ax'
field on entry to vm86 mode, so copy it from the 32-bit regs.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1437354550-25858-3-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/vm86_32.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c index 761a2f9039a3..9a2dc80059ab 100644 --- a/arch/x86/kernel/vm86_32.c +++ b/arch/x86/kernel/vm86_32.c @@ -294,6 +294,8 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk info->regs.pt.flags |= info->regs32->flags & ~SAFE_MASK; info->regs.pt.flags |= X86_VM_MASK; + info->regs.pt.orig_ax = info->regs32->orig_ax; + switch (info->cpu_type) { case CPU_286: tsk->thread.v86mask = 0; |