Description
In the Linux kernel, the following vulnerability has been resolved: HID: amd_sfh: Validate PCI BAR size before mapping The amd_sfh driver maps PCI BAR 2 using pcim_iomap_regions() and subsequently accesses MMIO registers at offsets up to 0x10958 (e.g., AMD_P2C_MSG3 at 0x1068C). However, the driver never validates that the BAR size is large enough to cover these accesses. If the driver is bound to a device with a smaller BAR 2, this leads to an out-of-bounds memory access and a page fault during the probe function. For example, a page fault can occur when reading from privdata->mmio + AMD_P2C_MSG3 in mp2_select_ops(): BUG: unable to handle page fault for address: ffffc9000390368c PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 105b64067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN NOPTI RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline] RIP: 0010:mp2_select_ops drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:282 [inline] RIP: 0010:amd_mp2_pci_probe+0x337/0x5f0 drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:487 Call Trace: <TASK> local_pci_probe drivers/pci/pci-driver.c:332 [inline] pci_call_probe drivers/pci/pci-driver.c:394 [inline] __pci_device_probe drivers/pci/pci-driver.c:455 [inline] pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489 Fix this by verifying that the length of BAR 2 is at least 128KB before attempting to map it. Since the maximum accessed offset is 0x10958, and PCI BAR sizes are powers of 2, any legitimate hardware will have a BAR size of at least 128KB.
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
4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < 92bf2883da0306ab9d1eb794acd1058fc5088ebcaffected4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < 7b3747d77767f066ccf4a9e8e3a8381643ab5368affected4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < 5ff24aa7af0bca0780fe4e6effce902065f2c0a7affected4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < dc687489131559ee52f447592f6d039a5a013061affected4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < 5f9e2ecb725adced013fbf5f94b9f185fad2e7d9affected4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < ee25833f037fa22d23ffdbfeebabe3579e8a0346affected4f567b9f8141a86c7d878fadf136e5d1408e3e61 to < 65bcc5f89704efe5b9d69d4ea2c1002d90c31382affected
Linux Linux
Default version status: affected
5.11affected0 to < 5.11unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc ↗
- https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368 ↗
- https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7 ↗
- https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061 ↗
- https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9 ↗
- https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346 ↗
- https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382 ↗