[RFC PATCH v2 6/8] arm64: Check the return PC of every stack frame
From: <hidden>
Date: 2021-03-15 16:59:20
Also in:
live-patching, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
From: "Madhavan T. Venkataraman" <redacted> 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 <redacted> --- 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
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