linux-kernel - [PATCH 3/3] selftests/mm: mremap_test: Use sscanf to parse /proc/self/maps

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>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20240330173557.2697684-4-dev.jain@arm.com>
Date: Sat, 30 Mar 2024 23:05:57 +0530
From: Dev Jain <dev.jain@....com>
To: akpm@...ux-foundation.org
Cc: shuah@...nel.org,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kaleshsingh@...gle.com,
	jhubbard@...dia.com,
	Anshuman.Khandual@....com,
	Dev Jain <dev.jain@....com>
Subject: [PATCH 3/3] selftests/mm: mremap_test: Use sscanf to parse /proc/self/maps

Enforce consistency across files by avoiding two separate functions to parse
/proc/self/maps, replacing them with a simple sscanf().

Signed-off-by: Dev Jain <dev.jain@....com>
---
 tools/testing/selftests/mm/mremap_test.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 678c79d5b8ef..1b03bcfaefdf 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -148,19 +148,21 @@ static unsigned long long get_mmap_min_addr(void)
  * Using /proc/self/maps, assert that the specified address range is contained
  * within a single mapping.
  */
-static bool is_range_mapped(FILE *maps_fp, void *start, void *end)
+static bool is_range_mapped(FILE *maps_fp, unsigned long start,
+			    unsigned long end)
 {
 	char *line = NULL;
 	size_t len = 0;
 	bool success = false;
+	unsigned long first_val, second_val;
 
 	rewind(maps_fp);
 
 	while (getline(&line, &len, maps_fp) != -1) {
-		char *first = strtok(line, "- ");
-		void *first_val = (void *)strtol(first, NULL, 16);
-		char *second = strtok(NULL, "- ");
-		void *second_val = (void *) strtol(second, NULL, 16);
+		if (sscanf(line, "%lx-%lx", &first_val, &second_val) != 2) {
+			ksft_exit_fail_msg("cannot parse /proc/self/maps\n");
+			break;
+		}
 
 		if (first_val <= start && second_val >= end) {
 			success = true;
@@ -255,7 +257,8 @@ static void mremap_expand_merge(FILE *maps_fp, unsigned long page_size)
 		goto out;
 	}
 
-	success = is_range_mapped(maps_fp, start, start + 3 * page_size);
+	success = is_range_mapped(maps_fp, (unsigned long)start,
+				  (unsigned long)(start + 3 * page_size));
 	munmap(start, 3 * page_size);
 
 out:
@@ -294,7 +297,8 @@ static void mremap_expand_merge_offset(FILE *maps_fp, unsigned long page_size)
 		goto out;
 	}
 
-	success = is_range_mapped(maps_fp, start, start + 3 * page_size);
+	success = is_range_mapped(maps_fp, (unsigned long)start,
+				  (unsigned long)(start + 3 * page_size));
 	munmap(start, 3 * page_size);
 
 out:
-- 
2.34.1