powerpc: use kernel endianness in MSR in 32-bit signal handler

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 <eerykitty@gmail.com>
Signed-off-by: Will Springer <skirmisher@protonmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2058876.irdbgypaU6@sheen

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 934cbdf6dd10e4f966e7c690375ac4ece1cf2a24..75ee918a120a5e67f499e53e0c1f7df5aabeba13 100644 (file)
--- 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: