On Mon, Jan 3, 2022 at 10:33 PM Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
> The generic function ptrace_report_syscall does a little more
> than syscall_trace on m68k. The function ptrace_report_syscall
> stops early if PT_TRACED is not set, it sets ptrace_message,
> and returns the result of fatal_signal_pending.
>
> Setting ptrace_message to a passed in value of 0 is effectively not
> setting ptrace_message, making that additional work a noop.
>
> Returning the result of fatal_signal_pending and letting the caller
> ignore the result becomes a noop in this change.
>
> When a process is ptraced, the flag PT_PTRACED is always set in
> current->ptrace. Testing for PT_PTRACED in ptrace_report_syscall is
> just an optimization to fail early if the process is not ptraced.
> Later on in ptrace_notify, ptrace_stop will test current->ptrace under
> tasklist_lock and skip performing any work if the task is not ptraced.
>
> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
As this depends on the removal of a parameter from
ptrace_report_syscall() earlier in this series:
Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
