In the Linux kernel, the following vulnerability has been resolved:
swiotlb: initialise restricted pool list_head when SWIOTLB_DYNAMIC=y
Using restricted DMA pools (CONFIG_DMA_RESTRICTED_POOL=y) in conjunction
with dynamic SWIOTLB (CONFIG_SWIOTLB_DYNAMIC=y) leads to the following
crash when initialising the restricted pools at boot-time:
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
| Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
| pc : rmem_swiotlb_device_init+0xfc/0x1ec
| lr : rmem_swiotlb_device_init+0xf0/0x1ec
| Call trace:
| rmem_swiotlb_device_init+0xfc/0x1ec
| of_reserved_mem_device_init_by_idx+0x18c/0x238
| of_dma_configure_id+0x31c/0x33c
| platform_dma_configure+0x34/0x80
faddr2line reveals that the crash is in the list validation code:
include/linux/list.h:83
include/linux/rculist.h:79
include/linux/rculist.h:106
kernel/dma/swiotlb.c:306
kernel/dma/swiotlb.c:1695
because add_mem_pool() is trying to list_add_rcu() to a NULL
'mem->pools'.
Fix the crash by initialising the 'mem->pools' list_head in
rmem_swiotlb_device_init() before calling add_mem_pool().
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Affected Vendors & Products
References
History
Wed, 06 Nov 2024 20:15:00 +0000
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-05-30T15:29:19.111Z
Updated: 2024-11-05T09:28:11.776Z
Reserved: 2024-05-30T15:25:07.069Z
Link: CVE-2024-36925
Vulnrichment
Updated: 2024-08-02T03:43:49.842Z
NVD
Status : Modified
Published: 2024-05-30T16:15:15.800
Modified: 2024-11-21T09:22:49.863
Link: CVE-2024-36925
Redhat