Messages in this thread | | | Date | Mon, 30 Mar 2020 10:34:46 +0200 | From | Oleg Nesterov <> | Subject | Re: Curiosity around 'exec_id' and some problems associated with it |
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On 03/29, Kees Cook wrote: > > On Tue, Mar 24, 2020 at 10:50:49PM +0100, Adam Zabrocki wrote: > > > > In short, if you hold the file descriptor open over an execve() (e.g. share it > > with child) the old VM is preserved (refcounted) and might be never released. > > Essentially, mother process' VM will be still in memory (and pointer to it is > > valid) even if the mother process passed an execve().
This was true after e268337dfe26dfc7efd422a804dbb27977a3cccc, but please see 6d08f2c7139790c ("proc: make sure mem_open() doesn't pin the target's memory"), iir it was merged soon after the 1st commit.
Oleg.
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