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-rw-r--r--kernel/audit.c71
1 files changed, 48 insertions, 23 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index e6d88635032c..dae3570b3a3b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -692,7 +692,8 @@ static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
goto out;
len = vsnprintf(skb->tail, avail, fmt, args2);
}
- skb_put(skb, (len < avail) ? len : avail);
+ if (len > 0)
+ skb_put(skb, len);
out:
return;
}
@@ -710,20 +711,47 @@ void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
va_end(args);
}
-void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf, size_t len)
+/* This function will take the passed buf and convert it into a string of
+ * ascii hex digits. The new string is placed onto the skb. */
+void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf,
+ size_t len)
{
- int i;
+ int i, avail, new_len;
+ unsigned char *ptr;
+ struct sk_buff *skb;
+ static const unsigned char *hex = "0123456789ABCDEF";
+
+ BUG_ON(!ab->skb);
+ skb = ab->skb;
+ avail = skb_tailroom(skb);
+ new_len = len<<1;
+ if (new_len >= avail) {
+ /* Round the buffer request up to the next multiple */
+ new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
+ avail = audit_expand(ab, new_len);
+ if (!avail)
+ return;
+ }
- for (i=0; i<len; i++)
- audit_log_format(ab, "%02x", buf[i]);
+ ptr = skb->tail;
+ for (i=0; i<len; i++) {
+ *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
+ *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
+ }
+ *ptr = 0;
+ skb_put(skb, len << 1); /* new string is twice the old string */
}
+/* This code will escape a string that is passed to it if the string
+ * contains a control character, unprintable character, double quote mark,
+ * or a space. Unescaped strings will start and end with a double quote mark.
+ * Strings that are escaped are printed in hex (2 digits per char). */
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
{
const unsigned char *p = string;
while (*p) {
- if (*p == '"' || *p == ' ' || *p < 0x20 || *p > 0x7f) {
+ if (*p == '"' || *p < 0x21 || *p > 0x7f) {
audit_log_hex(ab, string, strlen(string));
return;
}
@@ -732,31 +760,28 @@ void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
audit_log_format(ab, "\"%s\"", string);
}
-
-/* This is a helper-function to print the d_path without using a static
- * buffer or allocating another buffer in addition to the one in
- * audit_buffer. */
+/* This is a helper-function to print the escaped d_path */
void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
struct dentry *dentry, struct vfsmount *vfsmnt)
{
- char *p;
- struct sk_buff *skb = ab->skb;
- int len, avail;
+ char *p, *path;
if (prefix)
audit_log_format(ab, " %s", prefix);
- avail = skb_tailroom(skb);
- p = d_path(dentry, vfsmnt, skb->tail, avail);
- if (IS_ERR(p)) {
- /* FIXME: can we save some information here? */
- audit_log_format(ab, "<toolong>");
- } else {
- /* path isn't at start of buffer */
- len = ((char *)skb->tail + avail - 1) - p;
- memmove(skb->tail, p, len);
- skb_put(skb, len);
+ /* We will allow 11 spaces for ' (deleted)' to be appended */
+ path = kmalloc(PATH_MAX+11, GFP_KERNEL);
+ if (!path) {
+ audit_log_format(ab, "<no memory>");
+ return;
}
+ p = d_path(dentry, vfsmnt, path, PATH_MAX+11);
+ if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
+ /* FIXME: can we save some information here? */
+ audit_log_format(ab, "<too long>");
+ } else
+ audit_log_untrustedstring(ab, p);
+ kfree(path);
}
/* Remove queued messages from the audit_txlist and send them to user space. */
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