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From: ebiederm@xmission.com (Eric W. Biederman)
To: Linux Containers <containers@lists.linux-foundation.org>
Subject: Per user rlimits
Date: Fri, 28 Aug 2020 14:25:55 -0500	[thread overview]
Message-ID: <87imd2incs.fsf@x220.int.ebiederm.org> (raw)


Just to scope how much work it would be to fix rlimits
so they are not a problem for user namespaces I took a quick
survey.

The rlimits can be found in
include/uapi/asm-generic/resource.h

There are a total of 16 rlimits.
There are only 4 rlimits that are enforced at anything other
than process granularity.

RLIMIT_NPROC
RLIMIT_MEMLOCK 
RLIMIT_SIGPENDING
RLIMIT_MSGQUEUE

So it should not be difficult to fix those rlimits.

I think the implementation of RLIMIT_MEMLOCK is highly suspect, and
might be worth reexamining, as RLMIT_MEMLOCK it interpreted differently
in different contexts.  For the limit there is mm->locked_vm,
user->lock_vm, and user->locked_shm.

Eric



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             reply	other threads:[~2020-08-28 19:29 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-28 19:25 Eric W. Biederman [this message]
2020-08-28 20:33 ` Sargun Dhillon
2020-08-31  8:09   ` Aleksa Sarai
2020-08-31  8:12     ` Aleksa Sarai
2020-08-31 13:35       ` Eric W. Biederman

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