+ selftests-mm-fix-two-wformat-security-warnings-in-uffd-builds.patch added to mm-unstable branch

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The patch titled
     Subject: selftests/mm: fix two -Wformat-security warnings in uffd builds
has been added to the -mm mm-unstable branch.  Its filename is
     selftests-mm-fix-two-wformat-security-warnings-in-uffd-builds.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-fix-two-wformat-security-warnings-in-uffd-builds.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: selftests/mm: fix two -Wformat-security warnings in uffd builds
Date: Tue, 6 Jun 2023 00:16:32 -0700

The uffd tests generate two compile time warnings from clang's
-Wformat-security setting. These trigger at the call sites for
uffd_test_start() and uffd_test_skip().

1) Fix the uffd_test_start() issue by removing the intermediate
test_name variable (thanks to David Hildenbrand for showing how to do
this).

2) Fix the uffd_test_skip() issue by observing that there is no need for
a macro and a variable args approach, because all callers of
uffd_test_skip() pass in a simple char* string, without any format
specifiers. So just change uffd_test_skip() into a regular C function.

Link: https://lkml.kernel.org/r/20230606071637.267103-7-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Peter Xu <peterx@xxxxxxxxxx>
Tested-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 tools/testing/selftests/mm/uffd-unit-tests.c |   16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

--- a/tools/testing/selftests/mm/uffd-unit-tests.c~selftests-mm-fix-two-wformat-security-warnings-in-uffd-builds
+++ a/tools/testing/selftests/mm/uffd-unit-tests.c
@@ -109,12 +109,11 @@ static void uffd_test_pass(void)
 		ksft_inc_fail_cnt();		\
 	} while (0)
 
-#define  uffd_test_skip(...)  do {		\
-		printf("skipped [reason: ");	\
-		printf(__VA_ARGS__);		\
-		printf("]\n");			\
-		ksft_inc_xskip_cnt();		\
-	} while (0)
+static void uffd_test_skip(const char *message)
+{
+	printf("skipped [reason: %s]\n", message);
+	ksft_inc_xskip_cnt();
+}
 
 /*
  * Returns 1 if specific userfaultfd supported, 0 otherwise.  Note, we'll
@@ -1149,7 +1148,6 @@ int main(int argc, char *argv[])
 	uffd_test_case_t *test;
 	mem_type_t *mem_type;
 	uffd_test_args_t args;
-	char test_name[128];
 	const char *errmsg;
 	int has_uffd, opt;
 	int i, j;
@@ -1192,10 +1190,8 @@ int main(int argc, char *argv[])
 			mem_type = &mem_types[j];
 			if (!(test->mem_targets & mem_type->mem_flag))
 				continue;
-			snprintf(test_name, sizeof(test_name),
-				 "%s on %s", test->name, mem_type->name);
 
-			uffd_test_start(test_name);
+			uffd_test_start("%s on %s", test->name, mem_type->name);
 			if (!uffd_feature_supported(test)) {
 				uffd_test_skip("feature missing");
 				continue;
_

Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are

selftests-mm-fix-uffd-stress-unused-function-warning.patch
selftests-mm-fix-unused-variable-warnings-in-hugetlb-madvisec-migrationc.patch
selftests-mm-fix-warning-expression-which-evaluates-to-zero-in-mlock2-testsc.patch
selftests-mm-fix-invocation-of-tests-that-are-run-via-shell-scripts.patch
selftests-mm-gitignore-add-mkdirty-va_high_addr_switch.patch
selftests-mm-fix-two-wformat-security-warnings-in-uffd-builds.patch
selftests-mm-fix-a-possibly-uninitialized-warning-in-pkey-x86h.patch
selftests-mm-fix-build-failures-due-to-missing-madv_collapse.patch
selftests-mm-move-certain-uffd-routines-from-vm_utilc-to-uffd-commonc.patch
documentation-kselftest-make-headers-is-a-prerequisite.patch
selftests-error-out-if-kernel-header-files-are-not-yet-built.patch
selftests-error-out-if-kernel-header-files-are-not-yet-built-fix.patch




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