netdev - Re: [PATCH net-next 3/3] net: sysctl: allow dump_cpumask to handle higher numbers of CPUs

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: <20241018140541.GN1697@kernel.org>
Date: Fri, 18 Oct 2024 15:05:41 +0100
From: Simon Horman <horms@...nel.org>
To: Antoine Tenart <atenart@...nel.org>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
	edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] net: sysctl: allow dump_cpumask to handle
 higher numbers of CPUs

On Thu, Oct 17, 2024 at 05:24:19PM +0200, Antoine Tenart wrote:
> This fixes the output of rps_default_mask and flow_limit_cpu_bitmap when
> the CPU count is > 448, as it was truncated.
> 
> The underlying values are actually stored correctly when writing to
> these sysctl but displaying them uses a fixed length temporary buffer in
> dump_cpumask. This buffer can be too small if the CPU count is > 448.
> 
> Fix this by dynamically allocating the buffer in dump_cpumask, using a
> guesstimate of what we need.
> 
> Signed-off-by: Antoine Tenart <atenart@...nel.org>

Reviewed-by: Simon Horman <horms@...nel.org>