linux-kernel - RE: [RFC] tools/nolibc: replace duplicated -ENOSYS return with single -ENOSYS return

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2d52dbd55e6240d5a91ebdce67fe0b7b@AcuMS.aculab.com>
Date:   Wed, 30 Aug 2023 16:21:02 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Ammar Faizi' <ammarfaizi2@...weeb.org>,
        Zhangjin Wu <falcon@...ylab.org>, Willy Tarreau <w@....eu>
CC:     Arnd Bergmann <arnd@...db.de>,
        Thomas Weißschuh <thomas@...ch.de>,
        Yuan Tan <tanyuan@...ylab.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kselftest Mailing List 
        <linux-kselftest@...r.kernel.org>
Subject: RE: [RFC] tools/nolibc: replace duplicated -ENOSYS return with single
 -ENOSYS return

From: Ammar Faizi
> Sent: 30 August 2023 15:41
> 
> On 8/28/23 4:51 AM, David Laight wrote:
> > I just found a(nother) clang bug:
> > 	int f(void) { return "a"[2]; }
> > compiles to just a 'return'.
> 
> I don't think that's a bug. It's undefined behavior due to an
> out-of-bound read. What do you expect it to return?

I was actually expecting a warning/error if it didn't just read
the byte after the end of the string.

Just silently doing nothing didn't seem right for a modern compiler.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)