bpf: Fix array bounds error with may_goto

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix array bounds error with may_goto may_goto uses an additional 8 bytes on the stack, which causes the interpreters[] array to go out of bounds when calculating index by stack_size. 1. If a BPF program is rewritten, re-evaluate the stack size. For non-JIT cases, reject loading directly. 2. For non-JIT cases, calculating interpreters[idx] may still cause out-of-bounds array access, and just warn about it. 3. For jit_requested cases, the execution of bpf_func also needs to be warned. So move the definition of function __bpf_prog_ret0_warn out of the macro definition CONFIG_BPF_JIT_ALWAYS_ON.

References

• https://git.kernel.org/stable/c/19e6817f84000d0b06f09fd69ebd56217842c122
• https://git.kernel.org/stable/c/4524b7febdd55fb99ae2e1f48db64019fa69e643
• https://git.kernel.org/stable/c/1a86ae57b2600e5749f5f674e9d4296ac00c69a8
• https://git.kernel.org/stable/c/6ebc5030e0c5a698f1dd9a6684cddf6ccaed64a0