CVE-2022-49548 — bpf: Fix potential array overflow in bpf_trampoline_get_progs()

Affected: Linux

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

bpf: Fix potential array overflow in bpf_trampoline_get_progs()

The cnt value in the 'cnt >= BPF_MAX_TRAMP_PROGS' check does not include BPF_TRAMP_MODIFY_RETURN bpf programs, so the number of the attached BPF_TRAMP_MODIFY_RETURN bpf programs in a trampoline can exceed BPF_MAX_TRAMP_PROGS.

When this happens, the assignment '*progs++ = aux->prog' in bpf_trampoline_get_progs() will cause progs array overflow as the progs field in the bpf_tramp_progs struct can only hold at most BPF_MAX_TRAMP_PROGS bpf programs.

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CVE-2022-49548 — bpf: Fix potential array overflow in bpf_trampoline_get_progs()