tomoyo: Check exceeded quota early in tomoyo_domain_quota_is_ok().

[ Upstream commit 04e57a2d952bbd34bc45744e72be3eecdc344294 ]

If tomoyo is used in a testing/fuzzing environment in learning mode,
for lots of domains the quota will be exceeded and stay exceeded
for prolonged periods of time. In such cases it's pointless (and slow)
to walk the whole acl list again and again just to rediscover that
the quota is exceeded. We already have the TOMOYO_DIF_QUOTA_WARNED flag
that notes the overflow condition. Check it early to avoid the slowdown.

[penguin-kernel]
This patch causes a user visible change that the learning mode will not be
automatically resumed after the quota is increased. To resume the learning
mode, administrator will need to explicitly clear TOMOYO_DIF_QUOTA_WARNED
flag after increasing the quota. But I think that this change is generally
preferable, for administrator likely wants to optimize the acl list for
that domain before increasing the quota, or that domain likely hits the
quota again. Therefore, don't try to care to clear TOMOYO_DIF_QUOTA_WARNED
flag automatically when the quota for that domain changed.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index eba0b3395851e0ae4a3be8be16dc37f28dccd726..861fc6f4ebfb73ec0fd21c443ee72c8a192cd1d7 100644 (file)
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -1029,6 +1029,8 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
                return false;
        if (!domain)
                return true;
+       if (READ_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED]))
+               return false;
        list_for_each_entry_rcu(ptr, &domain->acl_info_list, list,
                                srcu_read_lock_held(&tomoyo_ss)) {
                u16 perm;
@@ -1074,14 +1076,12 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
        if (count < tomoyo_profile(domain->ns, domain->profile)->
            pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
                return true;
-       if (!domain->flags[TOMOYO_DIF_QUOTA_WARNED]) {
-               domain->flags[TOMOYO_DIF_QUOTA_WARNED] = true;
-               /* r->granted = false; */
-               tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
+       WRITE_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED], true);
+       /* r->granted = false; */
+       tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
 #ifndef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
-               pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n",
-                       domain->domainname->name);
+       pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n",
+               domain->domainname->name);
 #endif
-       }
        return false;
 }