Description
In the Linux kernel, the following vulnerability has been resolved: ata: ahci: fail probe if BAR too small for claimed ports When an AHCI controller is disabled in BIOS, its HOST_CAP register may contain a bogus value, e.g. 0xFFFFFFFF. Since CAP.NP (Number of Ports) is a zeroes based 5-bit register field, a value of 0x1f means 32 ports. If CAP.NP claims more ports than can physically fit within the mapped BAR region, accessing port registers beyond the BAR boundary causes a kernel panic. Add validation in ahci_init_one() to check that the BAR size is sufficient for the number of ports claimed in CAP.NP. The check calculates the required MMIO size as: required_size = 0x100 (global registers) + max_ports * 0x80 If required_size exceeds the actual BAR size, the probe fails with -ENODEV, preventing the panic and providing a clear error message. [cassel: commit log]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 533a08ea11217100cec7a0ed903cb9b9c892d6f1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c717b20100ef8cd06b5237af70ea2cb692e058ceaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ff0ab535f8febbd32afa5832f8d2d9b06a8d5060affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6d29b91164424256a759ddabc8f2de1ae09bd3f1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < df262c828b616450eb351349e91c63447551bd01affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f2e291043c37a896d7f9797e25a356dceb030177affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c4086c6e1af757e1ff26fa2d2926b3ec0195de79affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/533a08ea11217100cec7a0ed903cb9b9c892d6f1 ↗
- https://git.kernel.org/stable/c/c717b20100ef8cd06b5237af70ea2cb692e058ce ↗
- https://git.kernel.org/stable/c/ff0ab535f8febbd32afa5832f8d2d9b06a8d5060 ↗
- https://git.kernel.org/stable/c/6d29b91164424256a759ddabc8f2de1ae09bd3f1 ↗
- https://git.kernel.org/stable/c/df262c828b616450eb351349e91c63447551bd01 ↗
- https://git.kernel.org/stable/c/f2e291043c37a896d7f9797e25a356dceb030177 ↗
- https://git.kernel.org/stable/c/c4086c6e1af757e1ff26fa2d2926b3ec0195de79 ↗