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| author | Ralf Baechle <ralf@linux-mips.org> | 2011-11-24 23:08:49 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-29 00:23:12 -0500 |
| commit | ac1a1de31515d950f858ba47d2bba74ff9a2614d (patch) | |
| tree | 3314ca9498e18f4a37b7a818609b15848d07f38b /net/netrom | |
| parent | be639ac6901a082894771f55c8047d5772de5c27 (diff) | |
| download | linux-ac1a1de31515d950f858ba47d2bba74ff9a2614d.tar.bz2 | |
NET: NETROM: When adding a route verify length of mnemonic string.
struct nr_route_struct's mnemonic permits a string of up to 7 bytes to be
used. If userland passes a not zero terminated string to the kernel adding
a node to the routing table might result in the kernel attempting to read
copy a too long string.
Mnemonic is part of the NET/ROM routing protocol; NET/ROM routing table
updates only broadcast 6 bytes. The 7th byte in the mnemonic array exists
only as a \0 termination character for the kernel code's convenience.
Fixed by rejecting mnemonic strings that have no terminating \0 in the first
7 characters. Do this test only NETROM_NODE to avoid breaking NETROM_NEIGH
where userland might passing an uninitialized mnemonic field.
Initial patch by Dan Carpenter <dan.carpenter@oracle.com>.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Walter Harms <wharms@bfs.de>
Cc: Thomas Osterried <thomas@osterried.de>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom')
| -rw-r--r-- | net/netrom/nr_route.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c index 915a87ba23e1..8d7716ca5342 100644 --- a/net/netrom/nr_route.c +++ b/net/netrom/nr_route.c @@ -678,6 +678,11 @@ int nr_rt_ioctl(unsigned int cmd, void __user *arg) } switch (nr_route.type) { case NETROM_NODE: + if (strnlen(nr_route.mnemonic, 7) == 7) { + ret = -EINVAL; + break; + } + ret = nr_add_node(&nr_route.callsign, nr_route.mnemonic, &nr_route.neighbour, |