Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY A user reported that commit 105c42566a55 ("ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585") made the JMicron JMB585 unusable on his board. The failure is seen as soon as the ahci driver is probed, and booting with iommu=off does not solve the problem. Looking at the AHCI specification, PxCLBU and PxFBU are both read only '0' for HBAs that do not support 64-bit addressing. For HBAs that do support 64-bit addressing, the registers are read write, with a reset value that is Implementation Specific. When using the AHCI_HFLAG_32BIT_ONLY flag, the HBA does support 64-bit addressing, and a 32-bit DMA mask is set by simply clearing HOST_CAP_64. Thus, in this case, we need to explicitly clear the registers to 0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 8f510f68208a1f673d7c7234a687be4671490e9c; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before a5a8b4737f68bbac8aa0685af0c8921e6003c22b; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before b28a17d4a9bb0aa38b48681c3927b012ba40eabe; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before b691a3e244278362e552439d6d3ee5a5d3703488; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d; affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 82e47533221d4746947b74d2e79a478c36c6433a |
| Linux / Linux | affected 2.6.22; unaffected 0 before 2.6.22; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.54 through 6.18.*; unaffected 7.2.8 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71
- https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c
- https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb
- https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b
- https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe
- https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488
- https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d
- https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a