Messages in this thread Patch in this message | | | From | Brian Gerst <> | Subject | [PATCH 2/7] x86/vm86: Preserve orig_ax | Date | Sun, 19 Jul 2015 21:09:05 -0400 |
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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> --- 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; -- 2.4.3
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