MIPS: compat: Don't clobber personality bits in 32-bit sys_personality().
If PER_LINUX32 has been set on a 32-bit kernel, only twiddle with the
low-order personality bits, let the upper bits pass through.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Cc: Camm Maguire <camm@maguirefamily.org>
Patchwork: https://patchwork.linux-mips.org/patch/1751/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 6343b4a..876a75c 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -251,14 +251,15 @@
SYSCALL_DEFINE1(32_personality, unsigned long, personality)
{
+ unsigned int p = personality & 0xffffffff;
int ret;
- personality &= 0xffffffff;
+
if (personality(current->personality) == PER_LINUX32 &&
- personality == PER_LINUX)
- personality = PER_LINUX32;
- ret = sys_personality(personality);
- if (ret == PER_LINUX32)
- ret = PER_LINUX;
+ personality(p) == PER_LINUX)
+ p = (p & ~PER_MASK) | PER_LINUX32;
+ ret = sys_personality(p);
+ if (ret != -1 && personality(ret) == PER_LINUX32)
+ ret = (ret & ~PER_MASK) | PER_LINUX;
return ret;
}