[PATCH AUTOSEL 4.9 11/12] tomoyo: ignore data race while checking quota

[Sasha Levin]

From: Tetsuo Handa <penguin-kernel at I-love.SAKURA.ne.jp>

[ Upstream commit 5797e861e402fff2bedce4ec8b7c89f4248b6073 ]

syzbot is reporting that tomoyo's quota check is racy [1]. But this check
is tolerant of some degree of inaccuracy. Thus, teach KCSAN to ignore
this data race.

[1] https://syzkaller.appspot.com/bug?id=999533deec7ba6337f8aa25d8bd1a4d5f7e50476

Reported-by: syzbot <syzbot+0789a72b46fd91431bd8 at syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel at I-love.SAKURA.ne.jp>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 security/tomoyo/file.c    | 16 ++++++++--------
 security/tomoyo/network.c |  8 ++++----
 security/tomoyo/util.c    | 24 ++++++++++++------------
 3 files changed, 24 insertions(+), 24 deletions(-)

diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 7041a580019ec..370acd47bac84 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -355,13 +355,13 @@ static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
 {
 	u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
 		->perm;
-	u16 perm = *a_perm;
+	u16 perm = READ_ONCE(*a_perm);
 	const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
 	if (is_delete)
 		perm &= ~b_perm;
 	else
 		perm |= b_perm;
-	*a_perm = perm;
+	WRITE_ONCE(*a_perm, perm);
 	return !perm;
 }
 
@@ -427,14 +427,14 @@ static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
 {
 	u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
 					 head)->perm;
-	u8 perm = *a_perm;
+	u8 perm = READ_ONCE(*a_perm);
 	const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
 		->perm;
 	if (is_delete)
 		perm &= ~b_perm;
 	else
 		perm |= b_perm;
-	*a_perm = perm;
+	WRITE_ONCE(*a_perm, perm);
 	return !perm;
 }
 
@@ -504,13 +504,13 @@ static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
 {
 	u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
 		->perm;
-	u8 perm = *a_perm;
+	u8 perm = READ_ONCE(*a_perm);
 	const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
 	if (is_delete)
 		perm &= ~b_perm;
 	else
 		perm |= b_perm;
-	*a_perm = perm;
+	WRITE_ONCE(*a_perm, perm);
 	return !perm;
 }
 
@@ -639,14 +639,14 @@ static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
 {
 	u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
 					  head)->perm;
-	u8 perm = *a_perm;
+	u8 perm = READ_ONCE(*a_perm);
 	const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
 		->perm;
 	if (is_delete)
 		perm &= ~b_perm;
 	else
 		perm |= b_perm;
-	*a_perm = perm;
+	WRITE_ONCE(*a_perm, perm);
 	return !perm;
 }
 
diff --git a/security/tomoyo/network.c b/security/tomoyo/network.c
index 97527710a72a5..facb8409768d3 100644
--- a/security/tomoyo/network.c
+++ b/security/tomoyo/network.c
@@ -232,14 +232,14 @@ static bool tomoyo_merge_inet_acl(struct tomoyo_acl_info *a,
 {
 	u8 * const a_perm =
 		&container_of(a, struct tomoyo_inet_acl, head)->perm;
-	u8 perm = *a_perm;
+	u8 perm = READ_ONCE(*a_perm);
 	const u8 b_perm = container_of(b, struct tomoyo_inet_acl, head)->perm;
 
 	if (is_delete)
 		perm &= ~b_perm;
 	else
 		perm |= b_perm;
-	*a_perm = perm;
+	WRITE_ONCE(*a_perm, perm);
 	return !perm;
 }
 
@@ -258,14 +258,14 @@ static bool tomoyo_merge_unix_acl(struct tomoyo_acl_info *a,
 {
 	u8 * const a_perm =
 		&container_of(a, struct tomoyo_unix_acl, head)->perm;
-	u8 perm = *a_perm;
+	u8 perm = READ_ONCE(*a_perm);
 	const u8 b_perm = container_of(b, struct tomoyo_unix_acl, head)->perm;
 
 	if (is_delete)
 		perm &= ~b_perm;
 	else
 		perm |= b_perm;
-	*a_perm = perm;
+	WRITE_ONCE(*a_perm, perm);
 	return !perm;
 }
 
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 5fe3679137aeb..68e3ad955a28c 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -1038,30 +1038,30 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
 		u8 i;
 		if (ptr->is_deleted)
 			continue;
+		/*
+		 * Reading perm bitmap might race with tomoyo_merge_*() because
+		 * caller does not hold tomoyo_policy_lock mutex. But exceeding
+		 * max_learning_entry parameter by a few entries does not harm.
+		 */
 		switch (ptr->type) {
 		case TOMOYO_TYPE_PATH_ACL:
-			perm = container_of(ptr, struct tomoyo_path_acl, head)
-				->perm;
+			data_race(perm = container_of(ptr, struct tomoyo_path_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_PATH2_ACL:
-			perm = container_of(ptr, struct tomoyo_path2_acl, head)
-				->perm;
+			data_race(perm = container_of(ptr, struct tomoyo_path2_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_PATH_NUMBER_ACL:
-			perm = container_of(ptr, struct tomoyo_path_number_acl,
-					    head)->perm;
+			data_race(perm = container_of(ptr, struct tomoyo_path_number_acl, head)
+				  ->perm);
 			break;
 		case TOMOYO_TYPE_MKDEV_ACL:
-			perm = container_of(ptr, struct tomoyo_mkdev_acl,
-					    head)->perm;
+			data_race(perm = container_of(ptr, struct tomoyo_mkdev_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_INET_ACL:
-			perm = container_of(ptr, struct tomoyo_inet_acl,
-					    head)->perm;
+			data_race(perm = container_of(ptr, struct tomoyo_inet_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_UNIX_ACL:
-			perm = container_of(ptr, struct tomoyo_unix_acl,
-					    head)->perm;
+			data_race(perm = container_of(ptr, struct tomoyo_unix_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_MANUAL_TASK_ACL:
 			perm = 0;
-- 
2.27.0