linux-kernel - [PATCH] selftests: exec: make binaries position independent

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Message-Id: <20240416152341.3186853-1-usama.anjum@collabora.com>
Date: Tue, 16 Apr 2024 20:23:39 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Eric Biederman <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>,
	Shuah Khan <shuah@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>,
	Yang Yingliang <yangyingliang@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: kernel@...labora.com,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] selftests: exec: make binaries position independent

The -static overrides the -pie and binaries aren't position independent
anymore. Use -static-pie instead which would produce a static and
position independent binary. This has been caught by clang's warnings:

  clang: warning: argument unused during compilation: '-pie'
  [-Wunused-command-line-argument]

Tested with both gcc and clang after this change.

Fixes: 4d1cd3b2c5c1 ("tools/testing/selftests/exec: fix link error")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
---
 tools/testing/selftests/exec/Makefile | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/exec/Makefile b/tools/testing/selftests/exec/Makefile
index fb4472ddffd81..01940d9165d67 100644
--- a/tools/testing/selftests/exec/Makefile
+++ b/tools/testing/selftests/exec/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-CFLAGS = -Wall
+CFLAGS = -Wall #-Wunused-command-line-argument
 CFLAGS += -Wno-nonnull
 CFLAGS += -D_GNU_SOURCE
 
@@ -29,8 +29,8 @@ $(OUTPUT)/execveat.denatured: $(OUTPUT)/execveat
 	cp $< $@
 	chmod -x $@
 $(OUTPUT)/load_address_4096: load_address.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000 -pie -static $< -o $@
+	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000 -static-pie $< -o $@
 $(OUTPUT)/load_address_2097152: load_address.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x200000 -pie -static $< -o $@
+	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x200000 -static-pie $< -o $@
 $(OUTPUT)/load_address_16777216: load_address.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000000 -pie -static $< -o $@
+	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000000 -static-pie $< -o $@
-- 
2.39.2