From nobody Mon Feb 9 19:38:03 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C541D37FF68; Tue, 13 Jan 2026 08:28:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768292905; cv=none; b=Axtnd0cTFEDZu8JxRlzIwHApcR7tEgKoELapsJWgmK8ridjNMWgvZcGcQySAu0wjEkGAQDtVSp0PQX8cgIwEm7FLAf10SIkDU08zSUzFv/2f3nbWcQ5wEbhX25ePO1dvMsD7ABlm0AFS5gTmhY6xRtHJKyyqt9xSKGFiuI+azGY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768292905; c=relaxed/simple; bh=oGyDLUMFF4RuavOs3+hGo5dMR+svt6IDcZqk16aoF0Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fIhZZU1Y1NWWdngb75w19necdPTMSj61kCiRhPOYGdyYC5Wz+HktvN9eB1PqC8rXRivRC1TbFbhwm3L9b0Eqbk1VKFik8c0+la+xiSdYr9ZZOXn73/WZSGY4M0Nv2qZetNgASyksx160ibu3b60Ph5HSYL4RB3Kv8Zr+MLhXt+0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: cf83af7af05911f0a38c85956e01ac42-20260113 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:6d592cf2-844d-4c9b-8d33-fd072e1a86d3,IP:0,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:-5 X-CID-META: VersionHash:a9d874c,CLOUDID:56091ccb82104e93479814b9c1a7a845,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|850|898,TC:nil,Content:0|15|50 ,EDM:-3,IP:nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,O SA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: cf83af7af05911f0a38c85956e01ac42-20260113 X-User: jiangfeng@kylinos.cn Received: from localhost.localdomain [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1060331112; Tue, 13 Jan 2026 16:28:17 +0800 From: Feng Jiang To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, kees@kernel.org, andy@kernel.org, akpm@linux-foundation.org, jiangfeng@kylinos.cn, ebiggers@kernel.org, martin.petersen@oracle.com, ardb@kernel.org, ajones@ventanamicro.com, conor.dooley@microchip.com, samuel.holland@sifive.com, linus.walleij@linaro.org, nathan@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v2 05/14] lib/string_kunit: add correctness test for strlen Date: Tue, 13 Jan 2026 16:27:39 +0800 Message-Id: <20260113082748.250916-6-jiangfeng@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260113082748.250916-1-jiangfeng@kylinos.cn> References: <20260113082748.250916-1-jiangfeng@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a KUnit test for strlen() to verify correctness across different string lengths and memory alignments. Signed-off-by: Feng Jiang --- lib/tests/string_kunit.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/lib/tests/string_kunit.c b/lib/tests/string_kunit.c index f9a8e557ba77..88da97e50c8e 100644 --- a/lib/tests/string_kunit.c +++ b/lib/tests/string_kunit.c @@ -17,6 +17,9 @@ #define STRCMP_TEST_EXPECT_LOWER(test, fn, ...) KUNIT_EXPECT_LT(test, fn(_= _VA_ARGS__), 0) #define STRCMP_TEST_EXPECT_GREATER(test, fn, ...) KUNIT_EXPECT_GT(test, fn= (__VA_ARGS__), 0) =20 +#define STRING_TEST_MAX_LEN 128 +#define STRING_TEST_MAX_OFFSET 16 + static void string_test_memset16(struct kunit *test) { unsigned i, j, k; @@ -104,6 +107,28 @@ static void string_test_memset64(struct kunit *test) } } =20 +static void string_test_strlen(struct kunit *test) +{ + char *s; + size_t len, offset; + const size_t buf_size =3D STRING_TEST_MAX_LEN + STRING_TEST_MAX_OFFSET + = 1; + + s =3D kunit_kzalloc(test, buf_size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, s); + + memset(s, 'A', buf_size); + s[buf_size - 1] =3D '\0'; + + for (offset =3D 0; offset < STRING_TEST_MAX_OFFSET; offset++) { + for (len =3D 0; len <=3D STRING_TEST_MAX_LEN; len++) { + s[offset + len] =3D '\0'; + KUNIT_EXPECT_EQ_MSG(test, strlen(s + offset), len, + "offset:%zu len:%zu", offset, len); + s[offset + len] =3D 'A'; + } + } +} + static void string_test_strchr(struct kunit *test) { const char *test_string =3D "abcdefghijkl"; @@ -618,6 +643,7 @@ static struct kunit_case string_test_cases[] =3D { KUNIT_CASE(string_test_memset16), KUNIT_CASE(string_test_memset32), KUNIT_CASE(string_test_memset64), + KUNIT_CASE(string_test_strlen), KUNIT_CASE(string_test_strchr), KUNIT_CASE(string_test_strnchr), KUNIT_CASE(string_test_strspn), --=20 2.25.1