linux-kernel - [PATCH 2/2] apparmor: Fix unaligned memory accesses in KUnit test

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Message-ID: <20250531150822.135803-3-deller@kernel.org>
Date: Sat, 31 May 2025 17:08:22 +0200
From: deller@...nel.org
To: linux-kernel@...r.kernel.org,
	apparmor@...ts.ubuntu.com,
	John Johansen <john.johansen@...onical.com>,
	linux-security-module@...r.kernel.org
Cc: Helge Deller <deller@....de>
Subject: [PATCH 2/2] apparmor: Fix unaligned memory accesses in KUnit test

From: Helge Deller <deller@....de>

The testcase triggers some unneccessary unaligned memory accesses on the
parisc architecture:
  Kernel: unaligned access to 0x12f28e27 in policy_unpack_test_init+0x180/0x374 (iir 0x0cdc1280)
  Kernel: unaligned access to 0x12f28e67 in policy_unpack_test_init+0x270/0x374 (iir 0x64dc00ce)

Use the existing helper functions put_unaligned_le32() and
put_unaligned_le16() to avoid such warnings on architectures which
prefer aligned memory accesses.

Signed-off-by: Helge Deller <deller@....de>
---
 security/apparmor/policy_unpack_test.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/policy_unpack_test.c b/security/apparmor/policy_unpack_test.c
index 5b2ba88ae9e2..cf18744dafe2 100644
--- a/security/apparmor/policy_unpack_test.c
+++ b/security/apparmor/policy_unpack_test.c
@@ -9,6 +9,8 @@
 #include "include/policy.h"
 #include "include/policy_unpack.h"
 
+#include <linux/unaligned.h>
+
 #define TEST_STRING_NAME "TEST_STRING"
 #define TEST_STRING_DATA "testing"
 #define TEST_STRING_BUF_OFFSET \
@@ -80,7 +82,7 @@ static struct aa_ext *build_aa_ext_struct(struct policy_unpack_fixture *puf,
 	*(buf + 1) = strlen(TEST_U32_NAME) + 1;
 	strscpy(buf + 3, TEST_U32_NAME, e->end - (void *)(buf + 3));
 	*(buf + 3 + strlen(TEST_U32_NAME) + 1) = AA_U32;
-	*((__le32 *)(buf + 3 + strlen(TEST_U32_NAME) + 2)) = cpu_to_le32(TEST_U32_DATA);
+	put_unaligned_le32(TEST_U32_DATA, buf + 3 + strlen(TEST_U32_NAME) + 2);
 
 	buf = e->start + TEST_NAMED_U64_BUF_OFFSET;
 	*buf = AA_NAME;
@@ -103,7 +105,7 @@ static struct aa_ext *build_aa_ext_struct(struct policy_unpack_fixture *puf,
 	*(buf + 1) = strlen(TEST_ARRAY_NAME) + 1;
 	strscpy(buf + 3, TEST_ARRAY_NAME, e->end - (void *)(buf + 3));
 	*(buf + 3 + strlen(TEST_ARRAY_NAME) + 1) = AA_ARRAY;
-	*((__le16 *)(buf + 3 + strlen(TEST_ARRAY_NAME) + 2)) = cpu_to_le16(TEST_ARRAY_SIZE);
+	put_unaligned_le16(TEST_ARRAY_SIZE, buf + 3 + strlen(TEST_ARRAY_NAME) + 2);
 
 	return e;
 }
-- 
2.47.0