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Mathieu Desnoyers f144e7c727 [POWERPC] Fix atomicity of TIF update in flush_thread()

Fix atomicity of TIF update in flush_thread() for powerpc

Fixes it correctly with *_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

Applies on 2.6.20.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2007-03-16 16:37:28 +11:00

boot

Merge branch '86xx' into for_paulus

2007-02-18 08:34:33 -06:00

configs

[POWERPC] update cell_defconfig

2007-03-10 00:07:52 +01:00

kernel

[POWERPC] Fix atomicity of TIF update in flush_thread()

2007-03-16 16:37:28 +11:00

lib

[POWERPC] Use ARRAY_SIZE macro when appropriate