No functional changes, preparation for utrace-ptrace. tracehook_report_syscall_exit() and tracehook_signal_handler() assume that only ptrace can set TIF_SINGLESTEP. Currently this is true but we are going to change this, the stepping logic will be moved into utrace layer.
Change this code to check PT_PTRACED, ptrace-utrace doesn't set it. Signed-off-by: Roland McGrath <rol...@redhat.com> Signed-off-by: Oleg Nesterov <o...@redhat.com> --- include/linux/tracehook.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- V1/include/linux/tracehook.h~9_SIGNAL_HANDLER_CK_PTRACE 2009-11-24 20:29:07.000000000 +0100 +++ V1/include/linux/tracehook.h 2009-11-24 20:30:15.000000000 +0100 @@ -134,7 +134,7 @@ static inline __must_check int tracehook */ static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step) { - if (step) { + if (step && (task_ptrace(current) & PT_PTRACED)) { siginfo_t info; user_single_step_siginfo(current, regs, &info); force_sig_info(SIGTRAP, &info, current); @@ -386,7 +386,7 @@ static inline void tracehook_signal_hand const struct k_sigaction *ka, struct pt_regs *regs, int stepping) { - if (stepping) + if (stepping && (task_ptrace(current) & PT_PTRACED)) ptrace_notify(SIGTRAP); }