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x32: Make sure TS_COMPAT is cleared for x32 tasks

If a process has a non-x32 ia32 personality and changes to x32, the
process would keep its TS_COMPAT flag. x32 uses the presence of the
x32 flag on a syscall to determine compat status, so make sure
TS_COMPAT is cleared.

Signed-off-by: Bobby Powers <bobbypowers@gmail.com>
Link: http://lkml.kernel.org/r/1330230338-25077-1-git-send-email-bobbypowers@gmail.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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1 parent 3f21723 commit ce5f7a99df87918b5be4618a9386213a8e9a7146 @bpowers bpowers committed with H. Peter Anvin Feb 26, 2012
Showing with 3 additions and 0 deletions.
  1. +3 −0 arch/x86/kernel/process_64.c
@@ -540,6 +540,9 @@ void set_personality_ia32(bool x32)
clear_thread_flag(TIF_IA32);
set_thread_flag(TIF_X32);
current->personality &= ~READ_IMPLIES_EXEC;
+ /* is_compat_task() uses the presence of the x32
+ syscall bit flag to determine compat status */
+ current_thread_info()->status &= ~TS_COMPAT;
} else {
set_thread_flag(TIF_IA32);
clear_thread_flag(TIF_X32);

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