Re: +c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm-num_exe_file_vmas-removal.patch added to -mm tree

[Oleg Nesterov]

On 04/20, Konstantin Khlebnikov wrote:
>
>>> My question is: unless I missed something "it can't be changed again"
>>> is not actually true. A task does PR_SET_MM_EXE_FILE, then it forks
>>> the new child. The child can do PR_SET_MM_EXE_FILE again. Is this
>>> by design?
>>
>> Hmm, not sure, Konstantin?
>
> Why not? It has new pid, why it cannot change exe_file?

OK, if you do not see a problem - I agree with this patch.

I don't really understand what PR_SET_MM_EXE_FILE buys us if
parent/child can have different /proc/pid/exe links without
exec, but

> Actually I don't care too.

same here ;)

and at least this addresses the "establishes a bound on how
frequently the symlink can change" from Matt.

Oleg.

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