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Message-Id: <20241003151638.1608537-9-mathieu.desnoyers@efficios.com>
Date: Thu, 3 Oct 2024 11:16:38 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Peter Zijlstra <peterz@...radead.org>,
Alexei Starovoitov <ast@...nel.org>,
Yonghong Song <yhs@...com>,
"Paul E . McKenney" <paulmck@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Namhyung Kim <namhyung@...nel.org>,
Andrii Nakryiko <andrii.nakryiko@...il.com>,
bpf@...r.kernel.org,
Joel Fernandes <joel@...lfernandes.org>,
linux-trace-kernel@...r.kernel.org,
Andrii Nakryiko <andrii@...nel.org>,
Michael Jeanson <mjeanson@...icios.com>
Subject: [PATCH v1 8/8] tracing/bpf: Add might_fault check to syscall probes
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 <mathieu.desnoyers@...icios.com>
Acked-by: Andrii Nakryiko <andrii@...nel.org>
Tested-by: Andrii Nakryiko <andrii@...nel.org> # BPF parts
Cc: Michael Jeanson <mjeanson@...icios.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Yonghong Song <yhs@...com>
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: bpf@...r.kernel.org
Cc: Joel Fernandes <joel@...lfernandes.org>
---
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
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