diff options
| author | Dmitry V. Levin <ldv@altlinux.org> | 2015-12-27 02:13:27 +0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-02-13 13:34:09 +0300 |
| commit | 0f2ed5d5f58037e83b57a6dab9738a207eb75d96 (patch) | |
| tree | 8d2701a8ea1cf9e32b37cf822de0d150ce565b1f | |
| parent | 12f88515e0e99a220afdfaeeeedf2fe206fbdc24 (diff) | |
| download | linux-0f2ed5d5f58037e83b57a6dab9738a207eb75d96.tar.xz | |
sparc64: fix incorrect sign extension in sys_sparc64_personality
commit 525fd5a94e1be0776fa652df5c687697db508c91 upstream.
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: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | arch/sparc/kernel/sys_sparc_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index 0ff682d284e0..a062fe9a4e49 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -517,7 +517,7 @@ out: SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) { - int ret; + long ret; if (personality(current->personality) == PER_LINUX32 && personality(personality) == PER_LINUX) |