Add a might_fault() check to validate that the bpf sys_enter/sys_exit probe callbacks are indeed called from a context where page faults can be handled.
Signed-off-by: Mathieu Desnoyers <[email protected]> Cc: Michael Jeanson <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Masami Hiramatsu <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Yonghong Song <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Andrii Nakryiko <[email protected]> Cc: [email protected] Cc: Joel Fernandes <[email protected]> --- include/trace/bpf_probe.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/trace/bpf_probe.h b/include/trace/bpf_probe.h index 211b98d45fc6..099df5c3e38a 100644 --- a/include/trace/bpf_probe.h +++ b/include/trace/bpf_probe.h @@ -57,6 +57,7 @@ __bpf_trace_##call(void *__data, proto) \ static notrace void \ __bpf_trace_##call(void *__data, proto) \ { \ + might_fault(); \ guard(preempt_notrace)(); \ CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args)); \ } -- 2.39.2
