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

bpf: Fix softlockup in arena_map_free on 64k page kernel

On an aarch64 kernel with CONFIG_PAGE_SIZE_64KB=y,
arena_htab tests cause a segmentation fault and soft lockup.
The same failure is not observed with 4k pages on aarch64.

It turns out arena_map_free() is calling
apply_to_existing_page_range() with the address returned by
bpf_arena_get_kern_vm_start().  If this address is not page-aligned
the code ends up calling apply_to_pte_range() with that unaligned
address causing soft lockup.

Fix it by round up GUARD_SZ to PAGE_SIZE << 1 so that the
division by 2 in bpf_arena_get_kern_vm_start() returns
a page-aligned value.

https://git.kernel.org/stable/c/517e8a7835e8cfb398a0aeb0133de50e31cae32b

https://git.kernel.org/stable/c/787d556a3de447e70964a4bdeba9196f62a62b1e

https://git.kernel.org/stable/c/c1f3f3892d4526f18aaeffdb6068ce861e793ee3