CVE-2024-50203

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

bpf, arm64: Fix address emission with tag-based KASAN enabled

When BPF_TRAMP_F_CALL_ORIG is enabled, the address of a bpf_tramp_image

struct on the stack is passed during the size calculation pass and

an address on the heap is passed during code generation. This may

cause a heap buffer overflow if the heap address is tagged because

emit_a64_mov_i64() will emit longer code than it did during the size

calculation pass. The same problem could occur without tag-based

KASAN if one of the 16-bit words of the stack address happened to

be all-ones during the size calculation pass. Fix the problem by

assuming the worst case (4 instructions) when calculating the size

of the bpf_tramp_image address emission.