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[SPARC64]: Fix atomicity of TIF update in flush_thread() 

Fix atomicity of TIF update in flush_thread() for sparc64

Fixes correctly the race by using *_ti_thread_flag.

Race :

parent process executing :
sys_ptrace()
 (lock_kernel())
 (ptrace_get_task_struct(pid))
 arch_ptrace()
   ptrace_detach()
     ptrace_disable(child);
       clear_singlestep(child);
         clear_tsk_thread_flag(child, TIF_SINGLESTEP);
         (which clears the TIF_SINGLESTEP flag atomically from a different
          process)
 (put_task_struct(child))
 (unlock_kernel())

And at the same time, in the child process :
sys_execve()
 do_execve()
   search_binary_handler()
     load_elf_binary()
       flush_old_exec()
         flush_thread()
           doing a non-atomic thread flag update

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mathieu Desnoyers 2007-03-10 00:19:49 -08:00 committed by David S. Miller
parent 63abdcdc02
commit c0a79b229a
1 changed files with 7 additions and 2 deletions
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9
arch/sparc64/kernel/process.c
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@ -413,8 +413,13 @@ void flush_thread(void)
struct thread_info *t = current_thread_info();
struct mm_struct *mm;
if (t->flags & _TIF_ABI_PENDING)
t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
clear_ti_thread_flag(t, TIF_ABI_PENDING);
if (test_ti_thread_flag(t, TIF_32BIT))
clear_ti_thread_flag(t, TIF_32BIT);
else
set_ti_thread_flag(t, TIF_32BIT);
}
mm = t->task->mm;
if (mm)