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Subject[PATCH 2/7] x86/vm86: Preserve orig_ax
Date
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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