Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: iommu/iova: Fix alloc iova overflows issue In __alloc_and_insert_iova_range, there is an issue that retry_pfn overflows. The value of iovad->anchor.pfn_hi is ~0UL, then when iovad->cached_node is iovad->anchor, curr_iova->pfn_hi + 1 will overflow. As a result, if the retry logic is executed, low_pfn is updated to 0, and then new_pfn < low_pfn returns false to make the allocation successful. This issue occurs in the following two situations: 1. The first iova size exceeds the domain size. When initializing iova domain, iovad->cached_node is assigned as iovad->anchor. For example, the iova domain size is 10M, start_pfn is 0x1_F000_0000, and the iova size allocated for the first time is 11M. The following is the log information, new->pfn_lo is smaller than iovad->cached_node. Example log as follows: [ 223.798112][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range start_pfn:0x1f0000,retry_pfn:0x0,size:0xb00,limit_pfn:0x1f0a00 [ 223.799590][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range success start_pfn:0x1f0000,new->pfn_lo:0x1efe00,new->pfn_hi:0x1f08ff 2. The node with the largest iova->pfn_lo value in the iova domain is deleted, iovad->cached_node will be updated to iovad->anchor, and then the alloc iova size exceeds the maximum iova size that can be allocated in the domain. After judging that retry_pfn is less than limit_pfn, call retry_pfn+1 to fix the overflow issue.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4e89dce725213d3d0b0475211b500eda4ef4bf2f before c929a230c84441e400c32e7b7b4ab763711fb63e; affected 4e89dce725213d3d0b0475211b500eda4ef4bf2f before 61cbf790e7329ed78877560be7136f0b911bba7f; affected 4e89dce725213d3d0b0475211b500eda4ef4bf2f before dcdb3ba7e2a8caae7bfefd603bc22fd0ce9a389c |
| Linux / Linux | affected 5.11; unaffected 0 before 5.11; unaffected 5.15.89 through 5.15.*; unaffected 6.1.7 through 6.1.*; unaffected 6.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c929a230c84441e400c32e7b7b4ab763711fb63e
- https://git.kernel.org/stable/c/61cbf790e7329ed78877560be7136f0b911bba7f
- https://git.kernel.org/stable/c/dcdb3ba7e2a8caae7bfefd603bc22fd0ce9a389c
ADP enrichment
No English description supplied.
No references supplied.