dm-crypt, dm-verity: disable tasklets
Tasklets have an inherent problem with memory corruption. The function
tasklet_action_common calls tasklet_trylock, then it calls the tasklet
callback and then it calls tasklet_unlock. If the tasklet callback frees
the structure that contains the tasklet or if it calls some code that may
free it, tasklet_unlock will write into free memory.
The commits 8e14f610159d and d9a02e016aaf try to fix it for dm-crypt, but
it is not a sufficient fix and the data corruption can still happen [1].
There is no fix for dm-verity and dm-verity will write into free memory
with every tasklet-processed bio.
There will be atomic workqueues implemented in the kernel 6.9 [2]. They
will have better interface and they will not suffer from the memory
corruption problem.
But we need something that stops the memory corruption now and that can be
backported to the stable kernels. So, I'm proposing this commit that
disables tasklets in both dm-crypt and dm-verity. This commit doesn't
remove the tasklet support, because the tasklet code will be reused when
atomic workqueues will be implemented.
[1] https://lore.kernel.org/all/d390d7ee-f142-44d3-822a-87949e14608b@suse.de/T/
[2] https://lore.kernel.org/lkml/20240130091300.2968534-1-tj@kernel.org/
Metrics
Affected Vendors & Products
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Mon, 17 Mar 2025 16:30:00 +0000
Type | Values Removed | Values Added |
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First Time appeared |
Linux
Linux linux Kernel |
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Weaknesses | CWE-787 | |
CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* |
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Vendors & Products |
Linux
Linux linux Kernel |
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Metrics |
cvssV3_1
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cvssV3_1
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Tue, 22 Oct 2024 15:15:00 +0000
Type | Values Removed | Values Added |
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Metrics |
ssvc
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Tue, 22 Oct 2024 14:30:00 +0000
Type | Values Removed | Values Added |
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References |
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Wed, 11 Sep 2024 18:30:00 +0000
Type | Values Removed | Values Added |
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Metrics |
ssvc
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Wed, 11 Sep 2024 13:30:00 +0000
Type | Values Removed | Values Added |
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Metrics |
ssvc
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Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2025-05-04T08:54:44.383Z
Reserved: 2024-02-19T14:20:24.161Z
Link: CVE-2024-26718

Updated: 2024-08-02T00:14:12.969Z

Status : Analyzed
Published: 2024-04-03T15:15:53.897
Modified: 2025-03-17T16:01:17.667
Link: CVE-2024-26718


No data.