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From: Linus Torvalds <torvalds@linux-foundation.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexey Gladkov <legion@kernel.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	 Linux Containers <containers@lists.linux.dev>
Subject: Re: [GIT PULL] ucounts: Count rlimits in each user namespace
Date: Tue, 29 Jun 2021 09:34:17 -0700	[thread overview]
Message-ID: <CAHk-=wgs5+3MLjG_hsQcKdamOcTsJLsk47tV12FfD_0f2h47Rg@mail.gmail.com> (raw)
In-Reply-To: <87czs4u0rm.fsf@disp2133>

On Tue, Jun 29, 2021 at 8:52 AM Eric W. Biederman <ebiederm@xmission.com> wrote:
>
> 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.

I saw that, but _without_ that test you'd be left with just that

    sigpending <= task_rlimit(t, RLIMIT_SIGPENDING)

and if task_rlimit() is LONG_MAX, then that means "no limits", so it is all ok.

IOW, afaik even _if_ sigpending ends up being LONG_MAX, the
conditional does the right thing without that "sigpending < LONG_MAX"
test.

                Linus

  reply	other threads:[~2021-06-29 16:34 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 22:35 Eric W. Biederman
2021-06-29  3:47 ` Linus Torvalds
2021-06-29 15:04   ` Eric W. Biederman
2021-06-29 15:51   ` Eric W. Biederman
2021-06-29 16:34     ` Linus Torvalds [this message]
2021-06-29 16:42       ` Eric W. Biederman
2021-06-29 17:09         ` Eric W. Biederman
2021-07-01 16:41           ` Alexey Gladkov
2021-07-01 20:05             ` Eric W. Biederman
2021-06-29 17:17   ` Alexey Gladkov
2021-06-29 18:07     ` Linus Torvalds
2021-06-29 20:20       ` Alexey Gladkov
2021-06-29 20:33         ` Linus Torvalds
2021-06-29 21:22           ` Alexey Gladkov
2021-07-02 17:54           ` [PATCH] ucounts: Fix UCOUNT_RLIMIT_SIGPENDING counter leak Alexey Gladkov
2021-07-02 22:13             ` Linus Torvalds
2021-07-07 16:50               ` Alexey Gladkov
2021-07-07 17:23                 ` Linus Torvalds
2021-07-08 10:33                   ` [PATCH v2] " Alexey Gladkov
2021-07-08 18:44                     ` Linus Torvalds
2021-07-08 11:00                   ` [PATCH] ucounts: " Alexey Gladkov
2021-06-29  3:50 ` [GIT PULL] ucounts: Count rlimits in each user namespace pr-tracker-bot

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