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From:   Bernd Edlinger <bernd.edlinger@hotmail.de>
To:     "Eric W. Biederman" <ebiederm@xmission.com>
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Subject: Re: [PATCH v2 5/5] exec: Add a exec_update_mutex to replace
 cred_guard_mutex
Thread-Topic: [PATCH v2 5/5] exec: Add a exec_update_mutex to replace
 cred_guard_mutex
Thread-Index: AQHV9ZJHYfsGvDLnM0SksOJ5MpqOZahARvEA
Date:   Mon, 9 Mar 2020 13:45:52 +0000
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On 3/8/20 10:38 PM, Eric W. Biederman wrote:
> 
> The cred_guard_mutex is problematic.  The cred_guard_mutex is held
> over the userspace accesses as the arguments from userspace are read.
> The cred_guard_mutex is held of PTRACE_EVENT_EXIT as the the other

... is held while waiting for the trace parent to handle PTRACE_EVENT_EXIT
or something?

I wonder if we also should mention that
it is held while waiting for the trace parent to
receive the exit code with "wait"?

> threads are killed.  The cred_guard_mutex is held over
> "put_user(0, tsk->clear_child_tid)" in exit_mm().
> 
> Any of those can result in deadlock, as the cred_guard_mutex is held
> over a possible indefinite userspace waits for userspace.
> 
> Add exec_update_mutex that is only held over exec updating process

Add ?

> with the new contents of exec, so that code that needs not to be
> confused by exec changing the mm and the cred in ways that can not
> happen during ordinary execution of a process.
> 
> The plan is to switch the users of cred_guard_mutex to
> exec_udpate_mutex one by one.  This lets us move forward while still

s/udpate/update/


Bernd.