diff options
| author | Jiri Kosina <jkosina@suse.cz> | 2012-08-01 21:10:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-28 10:14:16 -0700 |
| commit | d37bcccee1b807af77b5c6767cb0df295f9dfbdb (patch) | |
| tree | 5b27427064113c553cea8c9dc885b6b07f823705 | |
| parent | f603fa368be8342b2bee401ac6c815e6e34b3373 (diff) | |
sparc64: do not clobber personality flags in sys_sparc64_personality()
[ Upstream commit a27032eee8cb6e16516f13c8a9752e9d5d4cc430 ]
There are multiple errors in how sys_sparc64_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: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/sparc/kernel/sys_sparc_64.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index 3ee51f189a5..57b7cab1e26 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -519,12 +519,12 @@ SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) { int ret; - if (current->personality == PER_LINUX32 && - personality == PER_LINUX) - personality = PER_LINUX32; + if (personality(current->personality) == PER_LINUX32 && + personality(personality) == PER_LINUX) + personality |= PER_LINUX32; ret = sys_personality(personality); - if (ret == PER_LINUX32) - ret = PER_LINUX; + if (personality(ret) == PER_LINUX32) + ret &= ~PER_LINUX32; return ret; } |