linux-kernel - Re: [PATCH AUTOSEL 4.19 26/26] Make filldir[64]() verify the directory entry filename is valid

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Date:   Wed, 9 Oct 2019 10:56:56 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jann Horn <jannh@...gle.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 4.19 26/26] Make filldir[64]() verify the
 directory entry filename is valid

On Wed, Oct 9, 2019 at 10:24 AM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Linus Torvalds <torvalds@...ux-foundation.org>
>
> [ Upstream commit 8a23eb804ca4f2be909e372cf5a9e7b30ae476cd ]

I didn't mark this for stable because I expect things to still change
- particularly the WARN_ON_ONCE() should be removed before final 5.4,
I just wanted to see if anybody could trigger it with testing etc.

(At least syzbot did trigger it).

If you do want to take it, take it without the WARN_ON_ONCE() calls
and note that in the commit message..

           Linus