linux-kernel - [PATCH 2/3] um: vdso: Always reject undefined references in during linking

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Message-Id: <20241011-vdso-checkundef-v1-2-1a46e0352d20@linutronix.de>
Date: Fri, 11 Oct 2024 11:18:26 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
 "H. Peter Anvin" <hpa@...or.com>, Richard Weinberger <richard@....at>, 
 Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
 Johannes Berg <johannes@...solutions.net>, 
 "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>
Cc: linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org, 
 sparclinux@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 2/3] um: vdso: Always reject undefined references in during
 linking

Instead of using a custom script to detect and fail on undefined
references, use --no-undefined for all VDSO linker invocations.

Drop the now unused checkundef.sh script.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/x86/um/vdso/Makefile      |  5 ++---
 arch/x86/um/vdso/checkundef.sh | 11 -----------
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile
index 6a77ea6434ffde178d07b4466ec18ca83718baae..7478d11dacb713384655ed76af3b469aeb5bae81 100644
--- a/arch/x86/um/vdso/Makefile
+++ b/arch/x86/um/vdso/Makefile
@@ -56,7 +56,6 @@ CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
 quiet_cmd_vdso = VDSO    $@
       cmd_vdso = $(CC) -nostdlib -o $@ \
 		       $(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
-		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
-		 sh $(src)/checkundef.sh '$(NM)' '$@'
+		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)

-VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack
+VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack -Wl,--no-undefined
diff --git a/arch/x86/um/vdso/checkundef.sh b/arch/x86/um/vdso/checkundef.sh
deleted file mode 100644
index 8e3ea6bb956fc8fead5e280bf82a52287d1328a4..0000000000000000000000000000000000000000
--- a/arch/x86/um/vdso/checkundef.sh
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-nm="$1"
-file="$2"
-$nm "$file" | grep '^ *U' > /dev/null 2>&1
-if [ $? -eq 1 ]; then
-    exit 0
-else
-    echo "$file: undefined symbols found" >&2
-    exit 1
-fi

-- 
2.47.0