This is a note to let you know that I've just added the patch titled
MIPS: fix EVA & non-SMP non-FPU FP context signal handling
to the 3.17-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:
mips-fix-eva-non-smp-non-fpu-fp-context-signal-handling.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 14fa12df1d6bc1d3389a0fa842e0ebd8e8a9af26 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@xxxxxxxxxx>
Date: Tue, 28 Oct 2014 11:25:51 +0000
Subject: MIPS: fix EVA & non-SMP non-FPU FP context signal handling
From: Paul Burton <paul.burton@xxxxxxxxxx>
commit 14fa12df1d6bc1d3389a0fa842e0ebd8e8a9af26 upstream.
The save_fp_context & restore_fp_context pointers were being assigned
to the wrong variables if either:
- The kernel is configured for UP & runs on a system without an FPU,
since b2ead5282885 "MIPS: Move & rename
fpu_emulator_{save,restore}_context".
- The kernel is configured for EVA, since ca750649e08c "MIPS: kernel:
signal: Prevent save/restore FPU context in user memory".
This would lead to FP context being clobbered incorrectly when setting
up a sigcontext, then the garbage values being saved uselessly when
returning from the signal.
Fix by swapping the pointer assignments appropriately.
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/8230/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/signal.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -658,13 +658,13 @@ static int signal_setup(void)
save_fp_context = _save_fp_context;
restore_fp_context = _restore_fp_context;
} else {
- save_fp_context = copy_fp_from_sigcontext;
- restore_fp_context = copy_fp_to_sigcontext;
+ save_fp_context = copy_fp_to_sigcontext;
+ restore_fp_context = copy_fp_from_sigcontext;
}
#endif /* CONFIG_SMP */
#else
- save_fp_context = copy_fp_from_sigcontext;;
- restore_fp_context = copy_fp_to_sigcontext;
+ save_fp_context = copy_fp_to_sigcontext;
+ restore_fp_context = copy_fp_from_sigcontext;
#endif
return 0;
Patches currently in stable-queue which might be from paul.burton@xxxxxxxxxx are
queue-3.17/mips-fix-eva-non-smp-non-fpu-fp-context-signal-handling.patch
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