Vulnerability CVE-2024-43854
Published: 2024-08-17

Description:
In the Linux kernel, the following vulnerability has been resolved:

block: initialize integrity buffer to zero before writing it to media

Metadata added by bio_integrity_prep is using plain kmalloc, which leads
to random kernel memory being written media. For PI metadata this is
limited to the app tag that isn't used by kernel generated metadata,
but for non-PI metadata the entire buffer leaks kernel memory.

Fix this by adding the __GFP_ZERO flag to allocations for writes.

 References:
https://git.kernel.org/stable/c/d418313bd8f55c079a7da12651951b489a638ac1
https://git.kernel.org/stable/c/23a19655fb56f241e592041156dfb1c6d04da644
https://git.kernel.org/stable/c/ebc0e91ba76dc6544fff9f5b66408b1982806a00
https://git.kernel.org/stable/c/899ee2c3829c5ac14bfc7d3c4a5846c0b709b78f
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