tree 0f267a0f5bdbc07797895369f5e04024ba2fb987
parent c63cb468f373f479ff52b4a1b75f8ecdeaaf4f16
author Jiri Kosina <jkosina@suse.cz> 1343891483 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1344436376 -0700

s390: do not clobber personality flags in sys_32_personality()

There are multiple errors in how sys_32_personality() handles personality
flags stored in top three bytes.

- directly comparing current->personality against PER_LINUX32 doesn't work
  in cases when any of the personality flags stored in the top three bytes
  are used.
- directly forcefully setting personality to PER_LINUX32 or PER_LINUX
  discards any flags stored in the top three bytes

Fix the first one by properly using personality() macro to compare only
PER_MASK bytes.
Fix the second one by setting only the bits that should be set, instead of
overwriting the whole value.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>