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

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Message-ID: <tip-2459ee8651dc5ab72790c2ffa99af288c7641b64@git.kernel.org>
Date:	Sat, 31 Oct 2015 01:55:07 -0700
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	bp@...en8.de, linux-kernel@...r.kernel.org, brgerst@...il.com,
	luto@...nel.org, mingo@...nel.org, stsp@...t.ru, hpa@...or.com,
	tglx@...utronix.de, torvalds@...ux-foundation.org
Subject: [tip:x86/urgent] x86/vm86: Set thread.vm86 to NULL on fork/clone

Commit-ID:  2459ee8651dc5ab72790c2ffa99af288c7641b64
Gitweb:     http://git.kernel.org/tip/2459ee8651dc5ab72790c2ffa99af288c7641b64
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Fri, 30 Oct 2015 22:42:46 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
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@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Stas Sergeev <stsp@...t.ru>
Link: http://lkml.kernel.org/r/71c5d6985d70ec8197c8d72f003823c81b7dcf99.1446270067.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 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;
+#endif
 
 	return fpu__copy(&dst->thread.fpu, &src->thread.fpu);
 }
--
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