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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2011-08-24 19:45:03 -0700
committerDavid S. Miller <davem@davemloft.net>2011-08-24 19:45:03 -0700
commitbc909d9ddbf7778371e36a651d6e4194b1cc7d4c (patch)
tree45fb13261b012c61a64713ee13f5c7fe60a046dd /include
parentc6f59d13e24187ff95427a9f4a5a7e14fb8faf5a (diff)
sendmmsg/sendmsg: fix unsafe user pointer access
Dereferencing a user pointer directly from kernel-space without going through the copy_from_user family of functions is a bad idea. Two of such usages can be found in the sendmsg code path called from sendmmsg, added by commit c71d8ebe7a4496fb7231151cb70a6baa0cb56f9a upstream. commit 5b47b8038f183b44d2d8ff1c7d11a5c1be706b34 in the 3.0-stable tree. Usages are performed through memcmp() and memcpy() directly. Fix those by using the already copied msg_sys structure instead of the __user *msg structure. Note that msg_sys can be set to NULL by verify_compat_iovec() or verify_iovec(), which requires additional NULL pointer checks. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: David Goulet <dgoulet@ev0ke.net> CC: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> CC: Anton Blanchard <anton@samba.org> CC: David S. Miller <davem@davemloft.net> CC: stable <stable@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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