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authorBrian Gerst <brgerst@gmail.com>2015-07-19 21:09:05 -0400
committerIngo Molnar <mingo@kernel.org>2015-07-21 09:12:23 +0200
commitdf1ae9a5dc66d9fd57109240042372b1065d984a (patch)
treec14e5d065f2fae8c8b6df252761dfe7e7313b332 /arch/x86/kernel/vm86_32.c
parent0233606ce5cf12c1a0e27cb197066ea5bc2bb488 (diff)
downloadop-kernel-dev-df1ae9a5dc66d9fd57109240042372b1065d984a.zip
op-kernel-dev-df1ae9a5dc66d9fd57109240042372b1065d984a.tar.gz
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/x86/kernel/vm86_32.c')
-rw-r--r--arch/x86/kernel/vm86_32.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 761a2f9..9a2dc80 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;
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