linux-kernel - [PATCH v5 3/5] lib: add more string to 64-bit integer conversion overflow tests

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Message-ID: <20260204135717.941256-4-dmantipov@yandex.ru>
Date: Wed,  4 Feb 2026 16:57:15 +0300
From: Dmitry Antipov <dmantipov@...dex.ru>
To: Andy Shevchenko <andriy.shevchenko@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: Kees Cook <kees@...nel.org>,
	"Darrick J . Wong" <djwong@...nel.org>,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dmitry Antipov <dmantipov@...dex.ru>
Subject: [PATCH v5 3/5] lib: add more string to 64-bit integer conversion overflow tests

Add a few more string to 64-bit integer conversion tests to
check whether 'kstrtoull()', 'kstrtoll()', 'kstrtou64()' and
'kstrtos64()' can handle overflows reported by
'_parse_integer_limit()'.

Suggested-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Signed-off-by: Dmitry Antipov <dmantipov@...dex.ru>
---
v5: bump version to match the series
v4: initial version to join the series
---
 lib/test-kstrtox.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/test-kstrtox.c b/lib/test-kstrtox.c
index ee87fef66cb5..811128d0df16 100644
--- a/lib/test-kstrtox.c
+++ b/lib/test-kstrtox.c
@@ -198,6 +198,7 @@ static void __init test_kstrtoull_fail(void)
 		{"10000000000000000000000000000000000000000000000000000000000000000",	2},
 		{"2000000000000000000000",	8},
 		{"18446744073709551616",	10},
+		{"569202370375329612767",	10},
 		{"10000000000000000",	16},
 		/* negative */
 		{"-0", 0},
@@ -275,9 +276,11 @@ static void __init test_kstrtoll_fail(void)
 		{"9223372036854775809",	10},
 		{"18446744073709551614",	10},
 		{"18446744073709551615",	10},
+		{"569202370375329612767",	10},
 		{"-9223372036854775809",	10},
 		{"-18446744073709551614",	10},
 		{"-18446744073709551615",	10},
+		{"-569202370375329612767",	10},
 		/* sign is first character if any */
 		{"-+1", 0},
 		{"-+1", 8},
@@ -334,6 +337,7 @@ static void __init test_kstrtou64_fail(void)
 		{"-1",	10},
 		{"18446744073709551616",	10},
 		{"18446744073709551617",	10},
+		{"569202370375329612767",	10},
 	};
 	TEST_FAIL(kstrtou64, u64, "%llu", test_u64_fail);
 }
@@ -386,6 +390,8 @@ static void __init test_kstrtos64_fail(void)
 		{"18446744073709551615",	10},
 		{"18446744073709551616",	10},
 		{"18446744073709551617",	10},
+		{"569202370375329612767",	10},
+		{"-569202370375329612767",	10},
 	};
 	TEST_FAIL(kstrtos64, s64, "%lld", test_s64_fail);
 }
-- 
2.52.0