* [PATCH 1/2] powerpc: use kernel endianness in MSR in 32-bit signal handler
@ 2021-01-03 1:34 Will Springer
0 siblings, 0 replies; only message in thread
From: Will Springer @ 2021-01-03 1:34 UTC (permalink / raw)
To: linuxppc-dev; +Cc: eerykitty, daniel
From: Joseph J Allen <eerykitty@gmail•com>
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>
---
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
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