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>

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 907d5a620bca2655a68a29fa004bc9445ae78543..abaf8445ce25d5c445149f1f04ca3af1a175a298 100644 (file)
--- 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.