diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2021-02-01 05:52:11 +0300 |
|---|---|---|
| committer | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2021-02-01 05:52:11 +0300 |
| commit | 5797e861e402fff2bedce4ec8b7c89f4248b6073 (patch) | |
| tree | 8703689665da1be3512f2a3efa3024f6404dea9c /security/tomoyo/network.c | |
| parent | 1048ba83fb1c00cd24172e23e8263972f6b5d9ac (diff) | |
| download | linux-5797e861e402fff2bedce4ec8b7c89f4248b6073.tar.xz | |
tomoyo: ignore data race while checking quota
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@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Diffstat (limited to 'security/tomoyo/network.c')
| -rw-r--r-- | security/tomoyo/network.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/security/tomoyo/network.c b/security/tomoyo/network.c index f9ff121d7e1e..a89ed55d85d4 100644 --- a/security/tomoyo/network.c +++ b/security/tomoyo/network.c @@ -233,14 +233,14 @@ 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; } @@ -259,14 +259,14 @@ 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; } |