linux-kernel - Re: [PATCH] firmware: arm_scmi: driver: Replace zero-length array with flexible-array member

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: <20200220171840.GB44840@bogus>
Date:   Thu, 20 Feb 2020 17:18:40 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] firmware: arm_scmi: driver: Replace zero-length array
 with flexible-array member

On Tue, Feb 11, 2020 at 05:10:45PM -0600, Gustavo A. R. Silva wrote:
> The current codebase makes use of the zero-length array language
> extension to the C90 standard, but the preferred mechanism to declare
> variable-length types such as these ones is a flexible array member[1][2],
> introduced in C99:
> 
> struct foo {
>         int stuff;
>         struct boo array[];
> };
> 
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertenly introduced[3] to the codebase from now on.
> 
> This issue was found with the help of Coccinelle.
> 
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied these 3 patches [0][1][2] for v5.7

--
Regards,
Sudeep

[0]: https://lore.kernel.org/r/20200211231604.GA17274@embeddedor
[1]: https://lore.kernel.org/r/20200211231252.GA14830@embeddedor
[2]: https://lore.kernel.org/r/20200211231045.GA13956@embeddedor