From ce5f7a99df87918b5be4618a9386213a8e9a7146 Mon Sep 17 00:00:00 2001 From: Bobby Powers Date: Sat, 25 Feb 2012 23:25:38 -0500 Subject: [PATCH] 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 Link: http://lkml.kernel.org/r/1330230338-25077-1-git-send-email-bobbypowers@gmail.com Signed-off-by: H. Peter Anvin --- arch/x86/kernel/process_64.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index a0701da2bd1..32e04120b2c 100644 --- a/arch/x86/kernel/process_64.c +++ b/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);