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05 April 2024, 19:05:47 UTC
Revision 1c95df85ca49640576de2f0a850925957b547b84 authored by Neal Cardwell on 08 December 2012, 19:43:21 UTC, committed by David S. Miller on 09 December 2012, 23:59:37 UTC 
inet_diag: fix oops for IPv4 AF_INET6 TCP SYN-RECV state
 
Fix inet_diag to be aware of the fact that AF_INET6 TCP connections
instantiated for IPv4 traffic and in the SYN-RECV state were actually
created with inet_reqsk_alloc(), instead of inet6_reqsk_alloc(). This
means that for such connections inet6_rsk(req) returns a pointer to a
random spot in memory up to roughly 64KB beyond the end of the
request_sock.

With this bug, for a server using AF_INET6 TCP sockets and serving
IPv4 traffic, an inet_diag user like `ss state SYN-RECV` would lead to
inet_diag_fill_req() causing an oops or the export to user space of 16
bytes of kernel memory as a garbage IPv6 address, depending on where
the garbage inet6_rsk(req) pointed.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent ed23ec4
History
Tip revision: 1c95df85ca49640576de2f0a850925957b547b84 authored by Neal Cardwell on 08 December 2012, 19:43:21 UTC
inet_diag: fix oops for IPv4 AF_INET6 TCP SYN-RECV state
Tip revision: 1c95df8
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