Commit 525fd5a9 authored by Dmitry V. Levin's avatar Dmitry V. Levin Committed by David S. Miller

sparc64: fix incorrect sign extension in sys_sparc64_personality

The value returned by sys_personality has type "long int".
It is saved to a variable of type "int", which is not a problem
yet because the type of task_struct->pesonality is "unsigned int".
The problem is the sign extension from "int" to "long int"
that happens on return from sys_sparc64_personality.

For example, a userspace call personality((unsigned) -EINVAL) will
result to any subsequent personality call, including absolutely
harmless read-only personality(0xffffffff) call, failing with
errno set to EINVAL.
Signed-off-by: default avatarDmitry V. Levin <ldv@altlinux.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7fdec82a
......@@ -413,7 +413,7 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second
SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
{
int ret;
long ret;
if (personality(current->personality) == PER_LINUX32 &&
personality(personality) == PER_LINUX)
......
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