Subject: [PATCH 1/2] powerpc: use kernel endianness in MSR in 32-bit signal handler

From: Will Springer <[email-masked]>
Date: Sun, 03 Jan 2021 01:34:35 +0000

From: Joseph J Allen <[email-masked]>

This mirrors the behavior in handle_rt_signal32, to obey kernel endianness
rather than assume a 32-bit process is big-endian. Without this change,
any 32-bit little-endian process will SIGILL immediately upon handling a
signal.

Signed-off-by: Joseph J Allen <[email-masked]>
Signed-off-by: Will Springer <[email-masked]>
---
 arch/powerpc/kernel/signal_32.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 934cbdf6dd10..75ee918a120a 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -929,8 +929,9 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
 	regs->gpr[3] = ksig->sig;
 	regs->gpr[4] = (unsigned long) sc;
 	regs->nip = (unsigned long)ksig->ka.sa.sa_handler;
-	/* enter the signal handler in big-endian mode */
+	/* enter the signal handler in native-endian mode */
 	regs->msr &= ~MSR_LE;
+	regs->msr |= (MSR_KERNEL & MSR_LE);
 	return 0;
 
 failed:
-- 
2.29.2