linux-kernel - Re: [PATCH 1/2] spi: spidev: fix a race condition when accessing spidev->spi

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]

Date:   Thu, 5 Jan 2023 15:30:47 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 1/2] spi: spidev: fix a race condition when accessing spidev->spi

On Thu, Jan 5, 2023 at 2:52 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Thu, Jan 05, 2023 at 01:40:59PM +0100, Bartosz Golaszewski wrote:
>
> > can replace the spinlock with a sleeping lock. Using an RW semaphore
> > allows the syscalls to run concurrently unless protected otherwise. We
>
> I'm not sure this is important or useful, there's not a lot that can
> practically happen concurrently when we get to actually interacting with
> the device and it's making the code a bit less clear.

You suggest to just use a mutex instead?

Bart