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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-02-20 12:22:52 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-02-21 19:29:26 +0000
commit53399053eb505cf541b2405bd9d9bca5ecfb96fb (patch)
tree05b7fff7b081592087df18449dd6dd72537e522d
parentdc810efb0ca5702c9d96782b99282d4b4383e877 (diff)
downloadlinux-linaro-53399053eb505cf541b2405bd9d9bca5ecfb96fb.tar.gz
ARM: Ensure predictable endian state on signal handler entry
Ensure a predictable endian state when entering signal handlers. This avoids programs which use SETEND to momentarily switch their endian state from having their signal handlers entered with an unpredictable endian state. Cc: <stable@kernel.org> Acked-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/signal.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 907d5a620bc..abaf8445ce2 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -474,7 +474,9 @@ setup_return(struct pt_regs *regs, struct k_sigaction *ka,
unsigned long handler = (unsigned long)ka->sa.sa_handler;
unsigned long retcode;
int thumb = 0;
- unsigned long cpsr = regs->ARM_cpsr & ~PSR_f;
+ unsigned long cpsr = regs->ARM_cpsr & ~(PSR_f | PSR_E_BIT);
+
+ cpsr |= PSR_ENDSTATE;
/*
* Maybe we need to deliver a 32-bit signal to a 26-bit task.