linux-kernel - Re: out-of-bounds in pid_nr_ns() due to "proc: modernize proc to support multiple private instances"

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Date:   Thu, 23 Apr 2020 16:11:58 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Qian Cai <cai@....pw>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        linux-fsdevel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Alexey Gladkov <gladkov.alexey@...il.com>
Subject: Re: out-of-bounds in pid_nr_ns() due to "proc: modernize proc to support multiple private instances"

Qian Cai <cai@....pw> writes:

> Eric, Stephen, can you pull out this series while Alexey is getting to
> the bottom of this slab-out-of-bounds?

Done several hours ago on my end.

fs/locks.c and fs/security/tomoyo/realpath.c were rolling proc_pid_ns by
hand and we need to correct that before Alexey's patches are safe.  That
is inprogress now.

Eric