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authorEric W. Biederman <ebiederm@xmission.com>2013-04-09 02:22:10 -0700
committerEric Paris <eparis@redhat.com>2013-05-07 22:27:15 -0400
commit780a7654cee8d61819512385e778e4827db4bfbc (patch)
treea97ea8256b7507c976714f9e9c48d8dd581d07a6 /kernel
parentb24a30a7305418ff138ff51776fc555ec57c011a (diff)
downloadlinux-linaro-stable-780a7654cee8d61819512385e778e4827db4bfbc.tar.gz
audit: Make testing for a valid loginuid explicit.
audit rule additions containing "-F auid!=4294967295" were failing with EINVAL because of a regression caused by e1760bd. Apparently some userland audit rule sets want to know if loginuid uid has been set and are using a test for auid != 4294967295 to determine that. In practice that is a horrible way to ask if a value has been set, because it relies on subtle implementation details and will break every time the uid implementation in the kernel changes. So add a clean way to test if the audit loginuid has been set, and silently convert the old idiom to the cleaner and more comprehensible new idiom. Cc: <stable@vger.kernel.org> # 3.7 Reported-By: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Tested-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/auditfilter.c17
-rw-r--r--kernel/auditsc.c5
2 files changed, 19 insertions, 3 deletions
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 478f4602c96b..bc6595fe952e 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -365,7 +365,10 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
case AUDIT_DIR:
case AUDIT_FILTERKEY:
break;
- /* arch is only allowed to be = or != */
+ case AUDIT_LOGINUID_SET:
+ if ((f->val != 0) && (f->val != 1))
+ return -EINVAL;
+ /* FALL THROUGH */
case AUDIT_ARCH:
if (f->op != Audit_not_equal && f->op != Audit_equal)
return -EINVAL;
@@ -419,17 +422,23 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
f->lsm_str = NULL;
f->lsm_rule = NULL;
+ /* Support legacy tests for a valid loginuid */
+ if ((f->type == AUDIT_LOGINUID) && (f->val == 4294967295)) {
+ f->type = AUDIT_LOGINUID_SET;
+ f->val = 0;
+ }
+
err = audit_field_valid(entry, f);
if (err)
goto exit_free;
err = -EINVAL;
switch (f->type) {
+ case AUDIT_LOGINUID:
case AUDIT_UID:
case AUDIT_EUID:
case AUDIT_SUID:
case AUDIT_FSUID:
- case AUDIT_LOGINUID:
case AUDIT_OBJ_UID:
f->uid = make_kuid(current_user_ns(), f->val);
if (!uid_valid(f->uid))
@@ -1222,6 +1231,10 @@ static int audit_filter_user_rules(struct audit_krule *rule, int type,
result = audit_uid_comparator(audit_get_loginuid(current),
f->op, f->uid);
break;
+ case AUDIT_LOGINUID_SET:
+ result = audit_comparator(audit_loginuid_set(current),
+ f->op, f->val);
+ break;
case AUDIT_MSGTYPE:
result = audit_comparator(type, f->op, f->val);
break;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index add3086bdb02..3c8a601324a2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -613,6 +613,9 @@ static int audit_filter_rules(struct task_struct *tsk,
if (ctx)
result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
break;
+ case AUDIT_LOGINUID_SET:
+ result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
+ break;
case AUDIT_SUBJ_USER:
case AUDIT_SUBJ_ROLE:
case AUDIT_SUBJ_TYPE:
@@ -1970,7 +1973,7 @@ int audit_set_loginuid(kuid_t loginuid)
unsigned int sessionid;
#ifdef CONFIG_AUDIT_LOGINUID_IMMUTABLE
- if (uid_valid(task->loginuid))
+ if (audit_loginuid_set(task))
return -EPERM;
#else /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */
if (!capable(CAP_AUDIT_CONTROL))