This is a note to let you know that I've just added the patch titled
arm64: fix possible invalid FPSIMD initialization state
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-fix-possible-invalid-fpsimd-initialization-state.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 6db83cea1c975b9a102e17def7d2795814e1ae2b Mon Sep 17 00:00:00 2001
From: Jiang Liu <[email protected]>
Date: Fri, 27 Sep 2013 09:04:41 +0100
Subject: arm64: fix possible invalid FPSIMD initialization state
From: Jiang Liu <[email protected]>
commit 6db83cea1c975b9a102e17def7d2795814e1ae2b upstream.
If context switching happens during executing fpsimd_flush_thread(),
stale value in FPSIMD registers will be saved into current thread's
fpsimd_state by fpsimd_thread_switch(). That may cause invalid
initialization state for the new process, so disable preemption
when executing fpsimd_flush_thread().
Signed-off-by: Jiang Liu <[email protected]>
Cc: Jiang Liu <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Cc: Mark Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm64/kernel/fpsimd.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -79,8 +79,10 @@ void fpsimd_thread_switch(struct task_st
void fpsimd_flush_thread(void)
{
+ preempt_disable();
memset(¤t->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
fpsimd_load_state(¤t->thread.fpsimd_state);
+ preempt_enable();
}
/*
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/arm64-fix-possible-invalid-fpsimd-initialization-state.patch
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