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CVE-2022-48714
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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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- Linux
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