[PATCH] audit syscall classes

Allow to tie upper bits of syscall bitmap in audit rules to kernel-defined
sets of syscalls.  Infrastructure, a couple of classes (with 32bit counterparts
for biarch targets) and actual tie-in on i386, amd64 and ia64.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 39 insertions, 0 deletions

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 7f2ea8b84a27..5b4e16276ca0 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -279,6 +279,29 @@ static int audit_to_watch(struct audit_krule *krule, char *path, int len,
         return 0;
 }
 
+static __u32 *classes[AUDIT_SYSCALL_CLASSES];
+
+int __init audit_register_class(int class, unsigned *list)
+{
+        __u32 *p = kzalloc(AUDIT_BITMASK_SIZE * sizeof(__u32), GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
+        while (*list != ~0U) {
+                unsigned n = *list++;
+                if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) {
+                        kfree(p);
+                        return -EINVAL;
+                }
+                p[AUDIT_WORD(n)] |= AUDIT_BIT(n);
+        }
+        if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) {
+                kfree(p);
+                return -EINVAL;
+        }
+        classes[class] = p;
+        return 0;
+}
+
 /* Common user-space to kernel rule translation. */
 static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
 {
@@ -322,6 +345,22 @@ static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
         for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
                 entry->rule.mask[i] = rule->mask[i];
 
+        for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) {
+                int bit = AUDIT_BITMASK_SIZE * 32 - i - 1;
+                __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)];
+                __u32 *class;
+
+                if (!(*p & AUDIT_BIT(bit)))
+                        continue;
+                *p &= ~AUDIT_BIT(bit);
+                class = classes[i];
+                if (class) {
+                        int j;
+                        for (j = 0; j < AUDIT_BITMASK_SIZE; j++)
+                                entry->rule.mask[j] |= class[j];
+                }
+        }
+
         return entry;
 
 exit_err: