[PATCH] x32: make sure TS_COMPAT is cleared for x32 tasks

Bobby Powers
2012-02-26T04:25:43Z

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>
---
arch/x86/kernel/process_64.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index e9ec8f1..a465973 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -539,6 +539,9 @@ 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);
--
1.7.7.6