[tip:x86/urgent] x86/vm86: Set thread.vm86 to NULL on fork/clone

From: tip-bot for Andy Lutomirski
Date: Sat Oct 31 2015 - 04:55:53 EST

Commit-ID: 2459ee8651dc5ab72790c2ffa99af288c7641b64
Gitweb: http://git.kernel.org/tip/2459ee8651dc5ab72790c2ffa99af288c7641b64
Author: Andy Lutomirski <luto@xxxxxxxxxx>
AuthorDate: Fri, 30 Oct 2015 22:42:46 -0700
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 31 Oct 2015 09:50:25 +0100

x86/vm86: Set thread.vm86 to NULL on fork/clone

thread.vm86 points to per-task information -- the pointer should not
be copied on clone.

Fixes: d4ce0f26c790 ("x86/vm86: Move fields from 'struct kernel_vm86_struct' to 'struct vm86'")
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Stas Sergeev <stsp@xxxxxxx>
Link: http://lkml.kernel.org/r/71c5d6985d70ec8197c8d72f003823c81b7dcf99.1446270067.git.luto@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
arch/x86/kernel/process.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index e28db18..9f7c21c 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -84,6 +84,9 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
memcpy(dst, src, arch_task_struct_size);
+#ifdef CONFIG_VM86
+ dst->thread.vm86 = NULL;

return fpu__copy(&dst->thread.fpu, &src->thread.fpu);
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