Thread (4 messages) 4 messages, 3 authors, 2024-08-12

Re: [PATCH] apparmor: fix policy_unpack_test on big endian systems

From: John Johansen <john.johansen@canonical.com>
Date: 2024-08-12 17:05:03
Also in: lkml

On 8/8/24 08:59, Guenter Roeck wrote:
policy_unpack_test fails on big endian systems because data byte order
is expected to be little endian but is generated in host byte order.
This results in test failures such as:

  # policy_unpack_test_unpack_array_with_null_name: EXPECTATION FAILED at security/apparmor/policy_unpack_test.c:150
     Expected array_size == (u16)16, but
         array_size == 4096 (0x1000)
         (u16)16 == 16 (0x10)
     # policy_unpack_test_unpack_array_with_null_name: pass:0 fail:1 skip:0 total:1
     not ok 3 policy_unpack_test_unpack_array_with_null_name
     # policy_unpack_test_unpack_array_with_name: EXPECTATION FAILED at security/apparmor/policy_unpack_test.c:164
     Expected array_size == (u16)16, but
         array_size == 4096 (0x1000)
         (u16)16 == 16 (0x10)
     # policy_unpack_test_unpack_array_with_name: pass:0 fail:1 skip:0 total:1

Add the missing endianness conversions when generating test data.

Fixes: 4d944bcd4e73 ("apparmor: add AppArmor KUnit tests for policy unpack")
Cc: Brendan Higgins <redacted>
Cc: Kees Cook <redacted>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Looks good

Acked-by: John Johansen <john.johansen@canonical.com>

I will pull this into my tree
quoted hunk ↗ jump to hunk
---
  security/apparmor/policy_unpack_test.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/security/apparmor/policy_unpack_test.c b/security/apparmor/policy_unpack_test.c
index 874fcf97794e..c64733d6c98f 100644
--- a/security/apparmor/policy_unpack_test.c
+++ b/security/apparmor/policy_unpack_test.c
@@ -80,14 +80,14 @@ 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;
-	*((u32 *)(buf + 3 + strlen(TEST_U32_NAME) + 2)) = TEST_U32_DATA;
+	*((__le32 *)(buf + 3 + strlen(TEST_U32_NAME) + 2)) = cpu_to_le32(TEST_U32_DATA);
  
  	buf = e->start + TEST_NAMED_U64_BUF_OFFSET;
  	*buf = AA_NAME;
  	*(buf + 1) = strlen(TEST_U64_NAME) + 1;
  	strscpy(buf + 3, TEST_U64_NAME, e->end - (void *)(buf + 3));
  	*(buf + 3 + strlen(TEST_U64_NAME) + 1) = AA_U64;
-	*((u64 *)(buf + 3 + strlen(TEST_U64_NAME) + 2)) = TEST_U64_DATA;
+	*((__le64 *)(buf + 3 + strlen(TEST_U64_NAME) + 2)) = cpu_to_le64(TEST_U64_DATA);
  
  	buf = e->start + TEST_NAMED_BLOB_BUF_OFFSET;
  	*buf = AA_NAME;
@@ -103,7 +103,7 @@ 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;
-	*((u16 *)(buf + 3 + strlen(TEST_ARRAY_NAME) + 2)) = TEST_ARRAY_SIZE;
+	*((__le16 *)(buf + 3 + strlen(TEST_ARRAY_NAME) + 2)) = cpu_to_le16(TEST_ARRAY_SIZE);
  
  	return e;
  }
  
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