提交 d846f711 编写于 作者: V Vasiliy Kulikov 提交者: Patrick McHardy

bridge: netfilter: fix information leak

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: NVasiliy Kulikov <segoon@openwall.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
上级 44bd4de9
......@@ -1107,6 +1107,8 @@ static int do_replace(struct net *net, const void __user *user,
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)
......
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