netdev - Re: [iproute2 1/2] ss: fix crash when skipping disabled header field

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] [day] [month] [year] [list]

Message-ID: <20180109080326.000f603e@xeon-e3>
Date:   Tue, 9 Jan 2018 08:03:26 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Antonio Quartulli <a@...table.cc>
Cc:     netdev@...r.kernel.org, Stefano Brivio <sbrivio@...hat.com>
Subject: Re: [iproute2 1/2] ss: fix crash when skipping disabled header
 field

On Sun,  7 Jan 2018 02:31:49 +0800
Antonio Quartulli <a@...table.cc> wrote:

> When the first header field is disabled (i.e. when passing the -t
> option), field_flush() is invoked with the `buffer` global variable
> still zero'd.
> However, in field_flush() we try to access buffer.cur->len
> during variables initialization, thus leading to a SIGSEGV.
> 
> It's interesting to note that this bug appears only when the code
> is compiled with -O0, because the compiler is smart
> enough to immediately jump to the return statement if optimizations
> are enabled and skip the faulty instruction.
> 
> Cc: Stefano Brivio <sbrivio@...hat.com>
> Cc: Stephen Hemminger <stephen@...workplumber.org>
> Signed-off-by: Antonio Quartulli <a@...table.cc>

Both applied, thanks.