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| author | Johannes Berg <johannes.berg@intel.com> | 2011-11-03 00:07:32 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-04 17:47:34 -0400 |
| commit | c30bc94758ae2a38a5eb31767c1985c0aae0950b (patch) | |
| tree | 2b8e0565fe338a56cecc23ce299590c44e4438b6 /lib/nlattr.c | |
| parent | 433aee04a447fb2e769c4570f327d9c2a956117b (diff) | |
| download | lwn-c30bc94758ae2a38a5eb31767c1985c0aae0950b.tar.gz lwn-c30bc94758ae2a38a5eb31767c1985c0aae0950b.zip | |
netlink: validate NLA_MSECS length
L2TP for example uses NLA_MSECS like this:
policy:
[L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
code:
if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
As nla_get_msecs() is essentially nla_get_u64() plus the
conversion to a HZ-based value, this will not properly
reject attributes from userspace that aren't long enough
and might overrun the message.
Add NLA_MSECS to the attribute minlen array to check the
size properly.
Cc: Thomas Graf <tgraf@suug.ch>
Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/nlattr.c')
| -rw-r--r-- | lib/nlattr.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/nlattr.c b/lib/nlattr.c index ac09f2226dc7..a8408b6cacdf 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -20,6 +20,7 @@ static const u16 nla_attr_minlen[NLA_TYPE_MAX+1] = { [NLA_U16] = sizeof(u16), [NLA_U32] = sizeof(u32), [NLA_U64] = sizeof(u64), + [NLA_MSECS] = sizeof(u64), [NLA_NESTED] = NLA_HDRLEN, }; |