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bridge: netfilter: fix information leak

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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]>
This commit is contained in:
Vasiliy Kulikov 2011-02-14 16:49:23 +01:00 • committed by Patrick McHardy
commit d846f71195
1 changed files with 2 additions and 0 deletions
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net/bridge/netfilter/ebtables.c
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@ -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)