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: <YeE588tXLrgWoUu4@hirez.programming.kicks-ass.net>
Date:   Fri, 14 Jan 2022 09:53:07 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sergei Trofimovich <slyich@...il.com>
Cc:     linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] objtool: check: give big enough buffer for pv_ops

On Fri, Jan 14, 2022 at 07:57:56AM +0000, Sergei Trofimovich wrote:
> On gcc-12 build fails flagging possible buffer overflow:
> 
>     check.c: In function 'validate_call':
>     check.c:2865:58: error: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 9 [-Werror=format-truncation=]
>      2865 |                 snprintf(pvname, sizeof(pvname), "pv_ops[%d]", idx);
>           |                                                          ^~
> 
> I think it's a valid warning:
> 
>     static char pvname[16];
>     int idx;
>     ...
>     idx = (rel->addend / sizeof(void *));
>     snprintf(pvname, sizeof(pvname), "pv_ops[%d]", idx);
> 
> we have only 7 chars for %d while it could take up to 9.

Right, very unlikely to have that many pv_ops, but it doesn't hurt to
fix this.

Thanks!

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ