[PATCH] powerpc: Make set_endian() return EINVAL when not supporting little endian
From: Christophe Leroy <hidden>
Date: 2021-08-25 13:43:55
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
There is no point in modifying MSR_LE bit on CPUs not supporting little endian. Just like done for get_endian(), make set_endian() return EINVAL in that case. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/kernel/process.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 185beb290580..b2b9919795a2 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c@@ -1995,6 +1995,10 @@ int set_endian(struct task_struct *tsk, unsigned int val) { struct pt_regs *regs = tsk->thread.regs; + if (!cpu_has_feature(CPU_FTR_PPC_LE) && + !cpu_has_feature(CPU_FTR_REAL_LE)) + return -EINVAL; + if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) return -EINVAL;
--
2.25.0