linux-kernel - [tip: objtool/core] scripts/faddr2line: Don't filter out non-function symbols from readelf

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Message-ID: <169813756439.3135.10447231132133711820.tip-bot2@tip-bot2>
Date:   Tue, 24 Oct 2023 08:52:44 -0000
From:   "tip-bot2 for Will Deacon" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Will Deacon <will@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] scripts/faddr2line: Don't filter out non-function
 symbols from readelf

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     180af1a5bdaf8d4964837a46a9fce8c3a7fd2d97
Gitweb:        https://git.kernel.org/tip/180af1a5bdaf8d4964837a46a9fce8c3a7fd2d97
Author:        Will Deacon <will@...nel.org>
AuthorDate:    Mon, 02 Oct 2023 17:57:47 +01:00
Committer:     Josh Poimboeuf <jpoimboe@...nel.org>
CommitterDate: Mon, 23 Oct 2023 08:35:01 -07:00

scripts/faddr2line: Don't filter out non-function symbols from readelf

As Josh points out in 20230724234734.zy67gm674vl3p3wv@...ble:

> Problem is, I think the kernel's symbol printing code prints the
> nearest kallsyms symbol, and there are some valid non-FUNC code
> symbols.  For example, syscall_return_via_sysret.

so we shouldn't be considering only 'FUNC'-type symbols in the output
from readelf.

Drop the function symbol type filtering from the faddr2line outer loop.

Suggested-by: Josh Poimboeuf <jpoimboe@...nel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Link: https://lore.kernel.org/r/20230724234734.zy67gm674vl3p3wv@treble
Signed-off-by: Will Deacon <will@...nel.org>
Link: https://lore.kernel.org/r/20231002165750.1661-2-will@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 scripts/faddr2line | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/faddr2line b/scripts/faddr2line
index 0e73aca..a35a420 100755
--- a/scripts/faddr2line
+++ b/scripts/faddr2line
@@ -260,7 +260,7 @@ __faddr2line() {
 
 		DONE=1
 
-	done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$4 == "FUNC" && $8 == fn')
+	done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
 }
 
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