From: Jens Axboe <axboe@kernel.dk>
To: Loic Poulain <loic.poulain@linaro.org>
Cc: linux-block@vger.kernel.org
Subject: Re: [PATCH] block: Deny writable memory mapping if block is read-only
Date: Fri, 19 May 2023 20:17:20 -0600 [thread overview]
Message-ID: <168454904056.390379.11320556325676488044.b4-ty@kernel.dk> (raw)
In-Reply-To: <20230510074223.991297-1-loic.poulain@linaro.org>
On Wed, 10 May 2023 09:42:23 +0200, Loic Poulain wrote:
> User should not be able to write block device if it is read-only at
> block level (e.g force_ro attribute). This is ensured in the regular
> fops write operation (blkdev_write_iter) but not when writing via
> user mapping (mmap), allowing user to actually write a read-only
> block device via a PROT_WRITE mapping.
>
> Example: This can lead to integrity issue of eMMC boot partition
> (e.g mmcblk0boot0) which is read-only by default.
>
> [...]
Applied, thanks!
[1/1] block: Deny writable memory mapping if block is read-only
commit: 69baa3a623fd2e58624f24f2f23d46f87b817c93
Best regards,
--
Jens Axboe
prev parent reply other threads:[~2023-05-20 2:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-10 7:42 [PATCH] block: Deny writable memory mapping if block is read-only Loic Poulain
2023-05-10 13:27 ` Christoph Hellwig
2023-05-10 14:17 ` Loic Poulain
2023-05-15 9:26 ` Christoph Hellwig
2023-05-15 9:30 ` Christoph Hellwig
2023-05-20 2:17 ` Jens Axboe [this message]
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