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da77f3a9aa
Add a test to verify the issue: kprobe_write_ctx can be abused to modify struct pt_regs of kernel functions via kprobe_write_ctx=true freplace progs. Without the fix, the issue is verified: kprobe_write_ctx=true freplace prog is allowed to attach to kprobe_write_ctx=false kprobe prog. Then, the first arg of bpf_fentry_test1 will be set as 0, and bpf_prog_test_run_opts() gets -EFAULT instead of 0. With the fix, the issue is rejected at attach time. Acked-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Link: https://lore.kernel.org/r/20260331145353.87606-3-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>