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Message-Id: <20210305120903.884706871@linuxfoundation.org>
Date: Fri, 5 Mar 2021 13:20:19 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
syzbot <syzbot+0789a72b46fd91431bd8@...kaller.appspotmail.com>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: [PATCH 5.11 014/104] tomoyo: ignore data race while checking quota
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
commit 5797e861e402fff2bedce4ec8b7c89f4248b6073 upstream.
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@...kaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
security/tomoyo/file.c | 16 ++++++++--------
security/tomoyo/network.c | 8 ++++----
security/tomoyo/util.c | 24 ++++++++++++------------
3 files changed, 24 insertions(+), 24 deletions(-)
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -362,14 +362,14 @@ static bool tomoyo_merge_path_acl(struct
{
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;
}
@@ -437,7 +437,7 @@ static bool tomoyo_merge_mkdev_acl(struc
{
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;
@@ -445,7 +445,7 @@ static bool tomoyo_merge_mkdev_acl(struc
perm &= ~b_perm;
else
perm |= b_perm;
- *a_perm = perm;
+ WRITE_ONCE(*a_perm, perm);
return !perm;
}
@@ -517,14 +517,14 @@ static bool tomoyo_merge_path2_acl(struc
{
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;
}
@@ -655,7 +655,7 @@ static bool tomoyo_merge_path_number_acl
{
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;
@@ -663,7 +663,7 @@ static bool tomoyo_merge_path_number_acl
perm &= ~b_perm;
else
perm |= b_perm;
- *a_perm = perm;
+ WRITE_ONCE(*a_perm, perm);
return !perm;
}
--- a/security/tomoyo/network.c
+++ b/security/tomoyo/network.c
@@ -233,14 +233,14 @@ static bool tomoyo_merge_inet_acl(struct
{
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;
}
@@ -259,14 +259,14 @@ static bool tomoyo_merge_unix_acl(struct
{
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;
}
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -1058,30 +1058,30 @@ bool tomoyo_domain_quota_is_ok(struct to
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;
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