linux-kernel - [PATCH] selftests/mm: Parse VMA range in one go

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date: Fri, 22 Mar 2024 17:35:51 +0530
From: Dev Jain <dev.jain@....com>
To: akpm@...ux-foundation.org,
	shuah@...nel.org
Cc: linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Anshuman.Khandual@....com,
	Dev Jain <dev.jain@....com>
Subject: [PATCH] selftests/mm: Parse VMA range in one go

Use sscanf() to directly parse the VMA range. No functional change is intended.

Signed-off-by: Dev Jain <dev.jain@....com>
---
 tools/testing/selftests/mm/mlock2-tests.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/tools/testing/selftests/mm/mlock2-tests.c b/tools/testing/selftests/mm/mlock2-tests.c
index 26f744188ad0..7f0d50fa361d 100644
--- a/tools/testing/selftests/mm/mlock2-tests.c
+++ b/tools/testing/selftests/mm/mlock2-tests.c
@@ -20,8 +20,6 @@ static int get_vm_area(unsigned long addr, struct vm_boundaries *area)
 	FILE *file;
 	int ret = 1;
 	char line[1024] = {0};
-	char *end_addr;
-	char *stop;
 	unsigned long start;
 	unsigned long end;
 
@@ -37,21 +35,10 @@ static int get_vm_area(unsigned long addr, struct vm_boundaries *area)
 	memset(area, 0, sizeof(struct vm_boundaries));
 
 	while(fgets(line, 1024, file)) {
-		end_addr = strchr(line, '-');
-		if (!end_addr) {
+		if (sscanf(line, "%lx-%lx", &start, &end) != 2) {
 			ksft_print_msg("cannot parse /proc/self/maps\n");
 			goto out;
 		}
-		*end_addr = '\0';
-		end_addr++;
-		stop = strchr(end_addr, ' ');
-		if (!stop) {
-			ksft_print_msg("cannot parse /proc/self/maps\n");
-			goto out;
-		}
-
-		sscanf(line, "%lx", &start);
-		sscanf(end_addr, "%lx", &end);
 
 		if (start <= addr && end > addr) {
 			area->start = start;
-- 
2.34.1