linux-kernel - Re: [REGRESSION] 5.8-rc3: seccomp crash with Chromium, QtWebEngine and related browsers: seccomp-bpf failure in syscall 0072

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Message-ID: <20200629150807.GB3183@techsingularity.net>
Date:   Mon, 29 Jun 2020 16:08:07 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     Martin Steigerwald <martin@...htvoll.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>
Subject: Re: [REGRESSION] 5.8-rc3: seccomp crash with Chromium, QtWebEngine
 and related browsers: seccomp-bpf failure in syscall 0072

On Mon, Jun 29, 2020 at 07:41:56AM -0700, Kees Cook wrote:
> On Mon, Jun 29, 2020 at 11:08:10AM +0200, Martin Steigerwald wrote:
> > Dear Andy, Kees, Will, dear kernel community,
> > 
> > With 5.8-rc3 there is a seccomp related crash which prevents Chromium and
> > QtWebEngine from starting:
> > 
> > Bug 208369 - seccomp crash with Chromium, QtWebEngine and related browsers: seccomp-bpf failure in syscall 0072
> > 
> > https://bugzilla.kernel.org/show_bug.cgi?id=208369
> > 
> > Reverting to 5.8-rc2 fixes the issue.
> 
> Hi,
> 
> It looks like this is from e9c15badbb7b ("fs: Do not check if there is a
> fsnotify watcher on pseudo inodes")
> 
> Currently being discussed here:
> https://lore.kernel.org/lkml/7b4aa1e985007c6d582fffe5e8435f8153e28e0f.camel@redhat.com/#r
> 

It's a definite problem. I've sent a revert but it hasn't hit lkml yet
for whatever reason.

-- 
Mel Gorman
SUSE Labs