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From: Christian Brauner <christian.brauner@ubuntu.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	Andreas Schwab <schwab@linux-m68k.org>,
	Jann Horn <jannh@google.com>, Kees Cook <keescook@chromium.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	Eric Biggers <ebiggers3@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	linux-security-module <linux-security-module@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	kernel list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/4] exec: Change uselib(2) IS_SREG() failure to EACCES
Date: Tue, 19 May 2020 16:47:27 +0200	[thread overview]
Message-ID: <20200519144727.lgj2wc7srrix7gyd@wittgenstein> (raw)
In-Reply-To: <CAMuHMdVGT1QN8WUqNcU8ihPLncUGfrjV49wb-8nHUgHhOzLeNw@mail.gmail.com>

On Tue, May 19, 2020 at 04:32:38PM +0200, Geert Uytterhoeven wrote:
> Hi Christian,
> 
> On Tue, May 19, 2020 at 3:15 PM Christian Brauner
> <christian.brauner@ubuntu.com> wrote:
> > On Tue, May 19, 2020 at 06:56:36AM -0500, Eric W. Biederman wrote:
> > > Andreas Schwab <schwab@linux-m68k.org> writes:
> > > > On Mai 18 2020, Eric W. Biederman wrote:
> > > >> If it was only libc4 and libc5 that used the uselib system call then it
> > > >> can probably be removed after enough time.
> > > >
> > > > Only libc4 used it, libc5 was already ELF.
> > >
> > > binfmt_elf.c supports uselib.  In a very a.out ish way.  Do you know if
> > > that support was ever used?
> > >
> > > If we are truly talking a.out only we should be able to make uselib
> > > conditional on a.out support in the kernel which is strongly mostly
> > > disabled at this point.
> >
> > The only ones that even allow setting AOUT:
> >
> > arch/alpha/Kconfig:     select HAVE_AOUT
> > arch/m68k/Kconfig:      select HAVE_AOUT if MMU
> >
> > and x86 deprecated it March 2019:
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eac616557050737a8d6ef6fe0322d0980ff0ffde
> 
> Quoting myself (for the second time this month):
>    "I think it's safe to assume no one still runs a.out binaries on m68k."
>     http://lore.kernel.org/r/CAMuHMdW+m0Q+j3rsQdMXnrEPm+XB5Y2AQrxW5sD1mZAKgmEqoA@mail.gmail.com

Well, it's just a great thing to hear. :)

Fyi, I once tried to give a demo with a Slackware version in a container
which pre-dated ELF on a x86 kernel with AOUT. It didn't go well...

Christian

  reply	other threads:[~2020-05-19 14:47 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-18  5:54 [PATCH 0/4] Relocate execve() sanity checks Kees Cook
2020-05-18  5:54 ` [PATCH 1/4] exec: Change uselib(2) IS_SREG() failure to EACCES Kees Cook
2020-05-18 13:02   ` Christian Brauner
2020-05-18 14:43     ` Jann Horn
2020-05-18 14:46       ` Christian Brauner
2020-05-18 23:57         ` Eric W. Biederman
2020-05-19  8:11           ` Christian Brauner
2020-05-19  8:37           ` Andreas Schwab
2020-05-19 11:56             ` Eric W. Biederman
2020-05-19 12:12               ` Andreas Schwab
2020-05-19 12:28                 ` Eric W. Biederman
2020-05-19 13:29                   ` Christian Brauner
2020-05-19 14:49                     ` Eric W. Biederman
2020-05-19 13:13               ` Christian Brauner
2020-05-19 14:32                 ` Geert Uytterhoeven
2020-05-19 14:47                   ` Christian Brauner [this message]
2020-05-18  5:54 ` [PATCH 2/4] exec: Relocate S_ISREG() check Kees Cook
     [not found]   ` <20200525091420.GI12456@shao2-debian>
2020-06-04 22:45     ` [exec] 166d03c9ec: ltp.execveat02.fail Kees Cook
2020-06-05  2:57     ` Kees Cook
2020-05-18  5:54 ` [PATCH 3/4] exec: Relocate path_noexec() check Kees Cook
2020-05-18  5:54 ` [PATCH 4/4] fs: Include FMODE_EXEC when converting flags to f_mode Kees Cook
2020-05-19 15:06 ` [PATCH 0/4] Relocate execve() sanity checks Eric W. Biederman
2020-05-19 16:26   ` Kees Cook
2020-05-19 17:41     ` Eric W. Biederman
2020-05-19 17:56       ` Kees Cook
2020-05-19 18:42         ` Eric W. Biederman
2020-05-19 21:17           ` Kees Cook
2020-05-19 22:58             ` John Johansen

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