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CVE-2022-48714

Disclosure Date: June 20, 2024
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Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Use VM_MAP instead of VM_ALLOC for ringbuf

After commit 2fd3fb0be1d1 (“kasan, vmalloc: unpoison VM_ALLOC pages
after mapping”), non-VM_ALLOC mappings will be marked as accessible
in __get_vm_area_node() when KASAN is enabled. But now the flag for
ringbuf area is VM_ALLOC, so KASAN will complain out-of-bound access
after vmap() returns. Because the ringbuf area is created by mapping
allocated pages, so use VM_MAP instead.

After the change, info in /proc/vmallocinfo also changes from
[start]–[end] 24576 ringbuf_map_alloc+0x171/0x290 vmalloc user
to
[start]–[end] 24576 ringbuf_map_alloc+0x171/0x290 vmap user

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CVSS V3 Severity and Metrics
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General Information

Vendors

  • Linux

Products

  • Linux
Technical Analysis