audit: fix signedness bug in audit_log_execve_info()
authorXi Wang <xi.wang@gmail.com>
Tue, 20 Dec 2011 23:39:41 +0000 (18:39 -0500)
committerAl Viro <viro@zeniv.linux.org.uk>
Tue, 17 Jan 2012 21:17:03 +0000 (16:17 -0500)
In the loop, a size_t "len" is used to hold the return value of
audit_log_single_execve_arg(), which returns -1 on error.  In that
case the error handling (len <= 0) will be bypassed since "len" is
unsigned, and the loop continues with (p += len) being wrapped.
Change the type of "len" to signed int to fix the error handling.

size_t len;
...
for (...) {
len = audit_log_single_execve_arg(...);
if (len <= 0)
break;
p += len;
}

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
kernel/auditsc.c

index 593237e3654d4fee9848c2e015b36fbbf8f02e7a..86584ecb1039ef9eccafdd0a4f87393889d8481b 100644 (file)
@@ -1362,8 +1362,8 @@ static void audit_log_execve_info(struct audit_context *context,
                                  struct audit_buffer **ab,
                                  struct audit_aux_data_execve *axi)
 {
-       int i;
-       size_t len, len_sent = 0;
+       int i, len;
+       size_t len_sent = 0;
        const char __user *p;
        char *buf;