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ipv4: netfilter: ip_tables: fix information leak to userland

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Structure ipt_getinfo is copied to userland with the field "name"
that has the last elements unitialized.  It leads to leaking of
contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>
This commit is contained in:
Vasiliy Kulikov 2010-11-03 08:45:06 +01:00 • committed by Patrick McHardy
commit b5f15ac4f8
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/netfilter/ip_tables.c
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@ -1124,6 +1124,7 @@ static int get_info(struct net *net, void __user *user,
private = &tmp;
}
#endif
memset(&info, 0, sizeof(info));
info.valid_hooks = t->valid_hooks;
memcpy(info.hook_entry, private->hook_entry,
sizeof(info.hook_entry));