2.6.38-stable review patch. If anyone has any objections, please let us know.
------------------ From: Vasiliy Kulikov <[email protected]> commit d846f71195d57b0bbb143382647c2c6638b04c5a upstream. Struct tmp is copied from userspace. It is not checked whether the "name" field is NULL terminated. This may lead to buffer overflow and passing contents of kernel stack as a module name to try_then_request_module() and, consequently, to modprobe commandline. It would be seen by all userspace processes. Signed-off-by: Vasiliy Kulikov <[email protected]> Signed-off-by: Patrick McHardy <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/bridge/netfilter/ebtables.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -1107,6 +1107,8 @@ static int do_replace(struct net *net, c if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter)) return -ENOMEM; + tmp.name[sizeof(tmp.name) - 1] = 0; + countersize = COUNTER_OFFSET(tmp.nentries) * nr_cpu_ids; newinfo = vmalloc(sizeof(*newinfo) + countersize); if (!newinfo) _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
