Commit a27032ee authored by Jiri Kosina's avatar Jiri Kosina Committed by David S. Miller

sparc64: do not clobber personality flags in sys_sparc64_personality()

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: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1a9b4993
...@@ -502,12 +502,12 @@ SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) ...@@ -502,12 +502,12 @@ SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
{ {
int ret; int ret;
if (current->personality == PER_LINUX32 && if (personality(current->personality) == PER_LINUX32 &&
personality == PER_LINUX) personality(personality) == PER_LINUX)
personality = PER_LINUX32; personality |= PER_LINUX32;
ret = sys_personality(personality); ret = sys_personality(personality);
if (ret == PER_LINUX32) if (personality(ret) == PER_LINUX32)
ret = PER_LINUX; ret &= ~PER_LINUX32;
return ret; return ret;
} }
......
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