TOMOYO: Allow controlling generation of access granted logs for per an entry basis.

Add per-entry flag which controls generation of grant logs because Xen and KVM
issues ioctl requests so frequently. For example,

  file ioctl /dev/null 0x5401 grant_log=no

will suppress /sys/kernel/security/tomoyo/audit even if preference says
grant_log=yes .

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
index 5dbb1f7617c0..075c3a6d1649 100644
--- a/security/tomoyo/audit.c
+++ b/security/tomoyo/audit.c
@@ -313,6 +313,7 @@ static unsigned int tomoyo_log_count;
  */
 static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns,
                              const u8 profile, const u8 index,
+                             const struct tomoyo_acl_info *matched_acl,
                              const bool is_granted)
 {
         u8 mode;
@@ -324,6 +325,9 @@ static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns,
         p = tomoyo_profile(ns, profile);
         if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG])
                 return false;
+        if (is_granted && matched_acl && matched_acl->cond &&
+            matched_acl->cond->grant_log != TOMOYO_GRANTLOG_AUTO)
+                return matched_acl->cond->grant_log == TOMOYO_GRANTLOG_YES;
         mode = p->config[index];
         if (mode == TOMOYO_CONFIG_USE_DEFAULT)
                 mode = p->config[category];
@@ -350,7 +354,8 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
         char *buf;
         struct tomoyo_log *entry;
         bool quota_exceeded = false;
-        if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type, r->granted))
+        if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type,
+                              r->matched_acl, r->granted))
                 goto out;
         buf = tomoyo_init_log(r, len, fmt, args);
         if (!buf)