* David Miller ([EMAIL PROTECTED]) wrote: > From: Mathieu Desnoyers <[EMAIL PROTECTED]> > Date: Thu, 8 Mar 2007 21:15:53 -0500 > > > Fix atomicity of TIF update in flush_thread() for x86_64 > > > > 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 > > > > It applies on 2.6.20. > > > > Signed-off-by: Rebecca Schultz <[EMAIL PROTECTED]> > > Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]> > > Please fix all platforms, not just your favorite one, kthx. > :-)
Please be comprehensive of the speed at which fingers can type on my keyboard. Your quickness at replying to email is impressive though ;) I am working on it, it won't take long. Regards, Mathieu -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
