Description
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.
Product status
317460317a02a1af512697e6e964298dedd8a163 (git) before c1f3f3892d4526f18aaeffdb6068ce861e793ee3
317460317a02a1af512697e6e964298dedd8a163 (git) before 787d556a3de447e70964a4bdeba9196f62a62b1e
317460317a02a1af512697e6e964298dedd8a163 (git) before 517e8a7835e8cfb398a0aeb0133de50e31cae32b
6.9
Any version before 6.9
6.12.17 (semver)
6.13.5 (semver)
6.14 (original_commit_for_fix)
References
git.kernel.org/...c/c1f3f3892d4526f18aaeffdb6068ce861e793ee3
git.kernel.org/...c/787d556a3de447e70964a4bdeba9196f62a62b1e
git.kernel.org/...c/517e8a7835e8cfb398a0aeb0133de50e31cae32b