[GIT PULL] Kselftest fixes for Linux 6.10-rc5

[Shuah Khan <skhan@linuxfoundation.org>]

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Hi Linus,

Please pull this kselftest fixes update for Linux 6.10-rc5.

This kselftest fixes update consists of 4 fixes to the following
build warnings:

- filesystems: warn_unused_result warnings
- seccomp: format-zero-length warnings
- fchmodat2: clang build warnings due to-static-libasan
- openat2: clang build warnings due to static-libasan, LOCAL_HDRS

diff for pull request is attached.

thanks,
-- Shuah

----------------------------------------------------------------
The following changes since commit 4bf15b1c657d22d1d70173e43264e4606dfe75ff:

   selftests/futex: don't pass a const char* to asprintf(3) (2024-05-31 14:37:10 -0600)

are available in the Git repository at:

   git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest tags/linux_kselftest-fixes-6.10-rc5

for you to fetch changes up to ed3994ac847e0d6605f248e7f6776b1d4f445f4b:

   selftests/fchmodat2: fix clang build failure due to -static-libasan (2024-06-11 15:05:05 -0600)

----------------------------------------------------------------
linux_kselftest-fixes-6.10-rc5

This kselftest fixes update consists of 4 fixes to the following
build warnings:

- filesystems: warn_unused_result warnings
- seccomp: format-zero-length warnings
- fchmodat2: clang build warnings due to-static-libasan
- openat2: clang build warnings due to static-libasan, LOCAL_HDRS

----------------------------------------------------------------
Amer Al Shanawany (2):
       selftests: filesystems: fix warn_unused_result build warnings
       selftests: seccomp: fix format-zero-length warnings

John Hubbard (2):
       selftests/openat2: fix clang build failures: -static-libasan, LOCAL_HDRS
       selftests/fchmodat2: fix clang build failure due to -static-libasan

  tools/testing/selftests/fchmodat2/Makefile                 | 11 ++++++++++-
  .../selftests/filesystems/statmount/statmount_test.c       | 12 ++++++++++--
  tools/testing/selftests/openat2/Makefile                   | 14 ++++++++++++--
  tools/testing/selftests/seccomp/seccomp_benchmark.c        |  6 +++---
  4 files changed, 35 insertions(+), 8 deletions(-)
----------------------------------------------------------------

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diff --git a/tools/testing/selftests/fchmodat2/Makefile b/tools/testing/selftests/fchmodat2/Makefile
index 71ec34bf1501..4373cea79b79 100644
--- a/tools/testing/selftests/fchmodat2/Makefile
+++ b/tools/testing/selftests/fchmodat2/Makefile
@@ -1,6 +1,15 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan $(KHDR_INCLUDES)
+CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined $(KHDR_INCLUDES)
+
+# gcc requires -static-libasan in order to ensure that Address Sanitizer's
+# library is the first one loaded. However, clang already statically links the
+# Address Sanitizer if -fsanitize is specified. Therefore, simply omit
+# -static-libasan for clang builds.
+ifeq ($(LLVM),)
+    CFLAGS += -static-libasan
+endif
+
 TEST_GEN_PROGS := fchmodat2_test
 
 include ../lib.mk
diff --git a/tools/testing/selftests/filesystems/statmount/statmount_test.c b/tools/testing/selftests/filesystems/statmount/statmount_test.c
index e6d7c4f1c85b..e8c019d72cbf 100644
--- a/tools/testing/selftests/filesystems/statmount/statmount_test.c
+++ b/tools/testing/selftests/filesystems/statmount/statmount_test.c
@@ -125,8 +125,16 @@ static uint32_t old_root_id, old_parent_id;
 
 static void cleanup_namespace(void)
 {
-	fchdir(orig_root);
-	chroot(".");
+	int ret;
+
+	ret = fchdir(orig_root);
+	if (ret == -1)
+		ksft_perror("fchdir to original root");
+
+	ret = chroot(".");
+	if (ret == -1)
+		ksft_perror("chroot to original root");
+
 	umount2(root_mntpoint, MNT_DETACH);
 	rmdir(root_mntpoint);
 }
diff --git a/tools/testing/selftests/openat2/Makefile b/tools/testing/selftests/openat2/Makefile
index 254d676a2689..185dc76ebb5f 100644
--- a/tools/testing/selftests/openat2/Makefile
+++ b/tools/testing/selftests/openat2/Makefile
@@ -1,8 +1,18 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan
+CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
 TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test
 
+# gcc requires -static-libasan in order to ensure that Address Sanitizer's
+# library is the first one loaded. However, clang already statically links the
+# Address Sanitizer if -fsanitize is specified. Therefore, simply omit
+# -static-libasan for clang builds.
+ifeq ($(LLVM),)
+    CFLAGS += -static-libasan
+endif
+
+LOCAL_HDRS += helpers.h
+
 include ../lib.mk
 
-$(TEST_GEN_PROGS): helpers.c helpers.h
+$(TEST_GEN_PROGS): helpers.c
diff --git a/tools/testing/selftests/seccomp/seccomp_benchmark.c b/tools/testing/selftests/seccomp/seccomp_benchmark.c
index b83099160fbc..94886c82ae60 100644
--- a/tools/testing/selftests/seccomp/seccomp_benchmark.c
+++ b/tools/testing/selftests/seccomp/seccomp_benchmark.c
@@ -194,14 +194,14 @@ int main(int argc, char *argv[])
 	ksft_set_plan(7);
 
 	ksft_print_msg("Running on:\n");
-	ksft_print_msg("");
+	ksft_print_msg("%s", "");
 	system("uname -a");
 
 	ksft_print_msg("Current BPF sysctl settings:\n");
 	/* Avoid using "sysctl" which may not be installed. */
-	ksft_print_msg("");
+	ksft_print_msg("%s", "");
 	system("grep -H . /proc/sys/net/core/bpf_jit_enable");
-	ksft_print_msg("");
+	ksft_print_msg("%s", "");
 	system("grep -H . /proc/sys/net/core/bpf_jit_harden");
 
 	affinity();