LoongArch: Enable exception fixup for specific ADE subcode

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Enable exception fixup for specific ADE subcode This patch allows the LoongArch BPF JIT to handle recoverable memory access errors generated by BPF_PROBE_MEM* instructions. When a BPF program performs memory access operations, the instructions it executes may trigger ADEM exceptions. The kernel’s built-in BPF exception table mechanism (EX_TYPE_BPF) will generate corresponding exception fixup entries in the JIT compilation phase; however, the architecture-specific trap handling function needs to proactively call the common fixup routine to achieve exception recovery. do_ade(): fix EX_TYPE_BPF memory access exceptions for BPF programs, ensure safe execution. Relevant test cases: illegal address access tests in module_attach and subprogs_extable of selftests/bpf.

References

• https://git.kernel.org/stable/c/73ede654d9daa2ee41bdd17bc62946fc5a0258cb
• https://git.kernel.org/stable/c/c49a28068363f3dca439aa5fe4d3b1f8159809fe
• https://git.kernel.org/stable/c/c2ed4f71e9288f21d5c53ff790270758e60fa5f9
• https://git.kernel.org/stable/c/9bdc1ab5e4ce6f066119018d8f69631a46f9c5a0