From: "Madhavan T. Venkataraman" <madvenka@xxxxxxxxxxxxxxxxxxx>
If a function encountered in a stack trace is not a valid kernel text
address, the stack trace is considered unreliable. Mark the stack trace
as not reliable.
Signed-off-by: Madhavan T. Venkataraman <madvenka@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/stacktrace.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 594806a0c225..358aae3906d7 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -101,6 +101,16 @@ static void check_if_reliable(unsigned long fp, struct stackframe *frame,
}
}
#endif
+
+ /*
+ * A NULL or invalid return address probably means there's some
+ * generated code which __kernel_text_address() doesn't know about.
+ * Mark the stack trace as not reliable.
+ */
+ if (!__kernel_text_address(frame->pc)) {
+ frame->reliable = false;
+ return;
+ }
}
/*
--
2.25.1
