linux-kernel - Re: [PATCH 1/4] exec: Change uselib(2) IS

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Message-ID: <20200518144627.sv5nesysvtgxwkp7@wittgenstein>
Date:   Mon, 18 May 2020 16:46:27 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Eric Biggers <ebiggers3@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] exec: Change uselib(2) IS_SREG() failure to EACCES

On Mon, May 18, 2020 at 04:43:20PM +0200, Jann Horn wrote:
> On Mon, May 18, 2020 at 3:03 PM Christian Brauner
> <christian.brauner@...ntu.com> wrote:
> > Also - gulp (puts on flame proof suit) - may I suggest we check if there
> > are any distros out there that still set CONFIG_USELIB=y
> 
> Debian seems to have it enabled on x86...
> 
> https://salsa.debian.org/kernel-team/linux/-/blob/master/debian/config/kernelarch-x86/config#L1896
> 
> A random Ubuntu 19.10 VM I have here has it enabled, too.

I wonder if there's any program - apart from _ancient_ glibc out there
that actually use it...
I looked at uselib in codsearch but the results were quite unspecific
but I didn't look too close.

Christian