Messages in this thread | | | From | Linus Torvalds <> | Date | Mon, 21 Jun 2021 12:22:06 -0700 | Subject | Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads |
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On Mon, Jun 21, 2021 at 11:59 AM Al Viro <viro@zeniv.linux.org.uk> wrote: > > There's a large mess around do_exit() - we have a bunch of > callers all over arch/*; if nothing else, I very much doubt that really > want to let tracer play with a thread in the middle of die_if_kernel() > or similar.
Right you are.
I'm really beginning to hate ptrace_{event,notify}() and those PTRACE_EVENT_xyz things.
I don't even know what uses them, honestly. How very annoying.
I guess it's easy enough (famous last words) to move the ptrace_event() call out of do_exit() and into the actual exit/exit_group system calls, and the signal handling path. The paths that actually have proper pt_regs.
Looks like sys_exit() and do_group_exit() would be the two places to do it (do_group_exit() would handle the signal case and sys_group_exit()).
Linus
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