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authorEric Paris <eparis@redhat.com>2007-06-04 17:00:14 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2007-07-22 09:57:02 -0400
commit74f2345b6be1410f824cb7dd638d2c10a9709379 (patch)
treea9cbdb517eb01b04de3e641d87ef42ad186e91e3
parentc926e4f432af0f61ac2b9b637fb51a4871a3fc91 (diff)
[PATCH] allow audit filtering on bit & operations
Right now the audit filter can match on = != > < >= blah blah blah. This allow the filter to also look at bitwise AND operations, & Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--include/linux/audit.h30
-rw-r--r--kernel/auditfilter.c11
2 files changed, 28 insertions, 13 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 8ca7ca0b47f0..a35859ab2fdb 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -161,7 +161,7 @@
* are currently used in an audit field constant understood by the kernel.
* If you are adding a new #define AUDIT_<whatever>, please ensure that
* AUDIT_UNUSED_BITS is updated if need be. */
-#define AUDIT_UNUSED_BITS 0x0FFFFC00
+#define AUDIT_UNUSED_BITS 0x07FFFC00
/* Rule fields */
@@ -213,25 +213,29 @@
#define AUDIT_NEGATE 0x80000000
/* These are the supported operators.
- * 4 2 1
- * = > <
- * -------
- * 0 0 0 0 nonsense
- * 0 0 1 1 <
- * 0 1 0 2 >
- * 0 1 1 3 !=
- * 1 0 0 4 =
- * 1 0 1 5 <=
- * 1 1 0 6 >=
- * 1 1 1 7 all operators
+ * 4 2 1 8
+ * = > < ?
+ * ----------
+ * 0 0 0 0 00 nonsense
+ * 0 0 0 1 08 & bit mask
+ * 0 0 1 0 10 <
+ * 0 1 0 0 20 >
+ * 0 1 1 0 30 !=
+ * 1 0 0 0 40 =
+ * 1 0 0 1 48 &= bit test
+ * 1 0 1 0 50 <=
+ * 1 1 0 0 60 >=
+ * 1 1 1 1 78 all operators
*/
+#define AUDIT_BIT_MASK 0x08000000
#define AUDIT_LESS_THAN 0x10000000
#define AUDIT_GREATER_THAN 0x20000000
#define AUDIT_NOT_EQUAL 0x30000000
#define AUDIT_EQUAL 0x40000000
+#define AUDIT_BIT_TEST (AUDIT_BIT_MASK|AUDIT_EQUAL)
#define AUDIT_LESS_THAN_OR_EQUAL (AUDIT_LESS_THAN|AUDIT_EQUAL)
#define AUDIT_GREATER_THAN_OR_EQUAL (AUDIT_GREATER_THAN|AUDIT_EQUAL)
-#define AUDIT_OPERATORS (AUDIT_EQUAL|AUDIT_NOT_EQUAL)
+#define AUDIT_OPERATORS (AUDIT_EQUAL|AUDIT_NOT_EQUAL|AUDIT_BIT_MASK)
/* Status symbols */
/* Mask values */
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 0ea96bab91cc..359645cff5b2 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -456,6 +456,13 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
case AUDIT_DEVMINOR:
case AUDIT_EXIT:
case AUDIT_SUCCESS:
+ /* bit ops are only useful on syscall args */
+ if (f->op == AUDIT_BIT_MASK ||
+ f->op == AUDIT_BIT_TEST) {
+ err = -EINVAL;
+ goto exit_free;
+ }
+ break;
case AUDIT_ARG0:
case AUDIT_ARG1:
case AUDIT_ARG2:
@@ -1566,6 +1573,10 @@ int audit_comparator(const u32 left, const u32 op, const u32 right)
return (left > right);
case AUDIT_GREATER_THAN_OR_EQUAL:
return (left >= right);
+ case AUDIT_BIT_MASK:
+ return (left & right);
+ case AUDIT_BIT_TEST:
+ return ((left & right) == right);
}
BUG();
return 0;