linux-kernel - Re: [GIT PULL] ucounts: Count rlimits in each user namespace

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Date:   Tue, 29 Jun 2021 10:51:57 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Alexey Gladkov <legion@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux.dev>
Subject: Re: [GIT PULL] ucounts: Count rlimits in each user namespace

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> Why the "sigpending < LONG_MAX" test in that
>
>         if (override_rlimit || (sigpending < LONG_MAX && sigpending <=
> task_rlimit(t, RLIMIT_SIGPENDING))) {
> thing?

On second look that sigpending < LONG_MAX check is necessary.  When
inc_rlimit_ucounts detects a problem it returns LONG_MAX.

So the check for LONG_MAX is the condensed check to see if there is a
problem in any other levels of the ucount hierarchy.

Eric