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-rw-r--r--kernel/auditfilter.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 3749193..6c61263 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -311,6 +311,43 @@ int audit_match_class(int class, unsigned syscall)
return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall);
}
+static inline int audit_match_class_bits(int class, u32 *mask)
+{
+ int i;
+
+ if (classes[class]) {
+ for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
+ if (mask[i] & classes[class][i])
+ return 0;
+ }
+ return 1;
+}
+
+static int audit_match_signal(struct audit_entry *entry)
+{
+ struct audit_field *arch = entry->rule.arch_f;
+
+ if (!arch) {
+ /* When arch is unspecified, we must check both masks on biarch
+ * as syscall number alone is ambiguous. */
+ return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
+ entry->rule.mask) &&
+ audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
+ entry->rule.mask));
+ }
+
+ switch(audit_classify_arch(arch->val)) {
+ case 0: /* native */
+ return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
+ entry->rule.mask));
+ case 1: /* 32bit on biarch */
+ return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
+ entry->rule.mask));
+ default:
+ return 1;
+ }
+}
+
/* Common user-space to kernel rule translation. */
static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
{
@@ -429,6 +466,7 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
err = -EINVAL;
goto exit_free;
}
+ entry->rule.arch_f = f;
break;
case AUDIT_PERM:
if (f->val & ~15)
@@ -519,7 +557,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
case AUDIT_FSGID:
case AUDIT_LOGINUID:
case AUDIT_PERS:
- case AUDIT_ARCH:
case AUDIT_MSGTYPE:
case AUDIT_PPID:
case AUDIT_DEVMAJOR:
@@ -531,6 +568,9 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
case AUDIT_ARG2:
case AUDIT_ARG3:
break;
+ case AUDIT_ARCH:
+ entry->rule.arch_f = f;
+ break;
case AUDIT_SUBJ_USER:
case AUDIT_SUBJ_ROLE:
case AUDIT_SUBJ_TYPE:
@@ -1221,6 +1261,9 @@ static inline int audit_add_rule(struct audit_entry *entry,
#ifdef CONFIG_AUDITSYSCALL
if (!dont_count)
audit_n_rules++;
+
+ if (!audit_match_signal(entry))
+ audit_signals++;
#endif
mutex_unlock(&audit_filter_mutex);
@@ -1294,6 +1337,9 @@ static inline int audit_del_rule(struct audit_entry *entry,
#ifdef CONFIG_AUDITSYSCALL
if (!dont_count)
audit_n_rules--;
+
+ if (!audit_match_signal(entry))
+ audit_signals--;
#endif
mutex_unlock(&audit_filter_mutex);