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05 April 2024, 19:05:47 UTC
Revision 217e6fa24ce28ec87fca8da93c9016cb78028612 authored by Willem de Bruijn on 07 February 2017, 20:57:20 UTC, committed by David S. Miller on 08 February 2017, 18:56:37 UTC 
net: introduce device min_header_len
 
The stack must not pass packets to device drivers that are shorter
than the minimum link layer header length.

Previously, packet sockets would drop packets smaller than or equal
to dev->hard_header_len, but this has false positives. Zero length
payload is used over Ethernet. Other link layer protocols support
variable length headers. Support for validation of these protocols
removed the min length check for all protocols.

Introduce an explicit dev->min_header_len parameter and drop all
packets below this value. Initially, set it to non-zero only for
Ethernet and loopback. Other protocols can follow in a patch to
net-next.

Fixes: 9ed988cd5915 ("packet: validate variable length ll headers")
Reported-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent d7426c6
History
Tip revision: 217e6fa24ce28ec87fca8da93c9016cb78028612 authored by Willem de Bruijn on 07 February 2017, 20:57:20 UTC
net: introduce device min_header_len
Tip revision: 217e6fa
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.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitattributes -rw-r--r-- 30 bytes
.gitignore -rw-r--r-- 1.3 KB
.mailmap -rw-r--r-- 7.7 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 96.0 KB
Kbuild -rw-r--r-- 2.8 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 383.0 KB
Makefile -rw-r--r-- 57.7 KB
README -rw-r--r-- 722 bytes

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