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

Eric W. Biederman
2021-06-29T15:52:09Z

Linus Torvalds <torvalds@linux-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