CVE-2024-40970: Avoid hw_desc array overrun in dw-axi-dmac
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: Avoid hw_desc array overrun in dw-axi-dmac I have a use case where nr_buffers = 3 and in which each descriptor is composed by 3 segments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put() handles the hw_desc considering the descs_allocated, this scenario would result in a kernel panic (hw_desc array will be overrun). To fix this, the proposal is to add a new member to the axi_dma_desc structure, where we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in axi_desc_put() to handle the hw_desc array correctly. Additionally I propose to remove the axi_chan_start_first_queued() call after completing the transfer, since it was identified that unbalance can occur (started descriptors can be interrupted and transfer ignored due to DMA channel not being enabled).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <5.15.162 | |
| Linux Linux kernel | >=5.16<6.1.96 | |
| Linux Linux kernel | >=6.2<6.6.36 | |
| Linux Linux kernel | >=6.7<6.9.7 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697
- https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5
- https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbe
- https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541e
- https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66
- https://git.kernel.org/linus/333e11bf47fa8d477db90e2900b1ed3c9ae9b697
- https://security-tracker.debian.org/tracker/CVE-2024-40970
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40970
- https://nvd.nist.gov/vuln/detail/CVE-2024-40970
- https://launchpad.net/bugs/cve/CVE-2024-40970
- https://ubuntu.com/security/CVE-2024-40970
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