Messages in this thread Patch in this message | | | Date | Tue, 21 Jul 2015 02:39:17 -0700 | From | tip-bot for Brian Gerst <> | Subject | [tip:x86/asm] x86/entry/vm86: Preserve 'orig_ax' |
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Commit-ID: df1ae9a5dc66d9fd57109240042372b1065d984a Gitweb: http://git.kernel.org/tip/df1ae9a5dc66d9fd57109240042372b1065d984a Author: Brian Gerst <brgerst@gmail.com> AuthorDate: Sun, 19 Jul 2015 21:09:05 -0400 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Tue, 21 Jul 2015 09:12:23 +0200
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> --- arch/x86/kernel/vm86_32.c | 2 ++ 1 file changed, 2 insertions(+)
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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