The usage of -ptrace in utrace-ptrace is racy [...]
Sure. Replace it. I'm not sure what purpose -ptrace (or ctx-flags)
serves for attach/detach. You need somewhere to store the
PTRACE_SETOPTIONS state and so forth, sure. But you can probably just
handle the attachedness at the utrace level.
On 07/16, Roland McGrath wrote:
Looks like a horrible hack, imho. Utrace should know nothing about
ptrace.
Agreed!
Can't we do something like
[...]
+ // SPECIAL!!! must not block/etc
+ void (*notify_stopped)(...);
Part of the point about utrace is to make it
If -report_xxx() returns UTRACE_STOP the tracee will do utrace_stop
eventually. But how can the tracer know the tracee is already
TASK_TRACED/-stopped?
We don't really have a way. It is something we need to address better.
This is the most essential thing that made the old
