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authorRoman Gushchin <klamm@yandex-team.ru>2013-08-02 18:36:40 +0400
committerDavid S. Miller <davem@davemloft.net>2013-08-02 15:18:53 -0700
commit5f671d6b4ec3e6d66c2a868738af2cdea09e7509 (patch)
treeb117717db9f3b70118095c0e12a0acb1daad5591 /net/netlabel
parent3508ea333ed5414561af4c818b3b80c0acca1845 (diff)
downloadop-kernel-dev-5f671d6b4ec3e6d66c2a868738af2cdea09e7509.zip
op-kernel-dev-5f671d6b4ec3e6d66c2a868738af2cdea09e7509.tar.gz
net: check net.core.somaxconn sysctl values
It's possible to assign an invalid value to the net.core.somaxconn sysctl variable, because there is no checks at all. The sk_max_ack_backlog field of the sock structure is defined as unsigned short. Therefore, the backlog argument in inet_listen() shouldn't exceed USHRT_MAX. The backlog argument in the listen() syscall is truncated to the somaxconn value. So, the somaxconn value shouldn't exceed 65535 (USHRT_MAX). Also, negative values of somaxconn are meaningless. before: $ sysctl -w net.core.somaxconn=256 net.core.somaxconn = 256 $ sysctl -w net.core.somaxconn=65536 net.core.somaxconn = 65536 $ sysctl -w net.core.somaxconn=-100 net.core.somaxconn = -100 after: $ sysctl -w net.core.somaxconn=256 net.core.somaxconn = 256 $ sysctl -w net.core.somaxconn=65536 error: "Invalid argument" setting key "net.core.somaxconn" $ sysctl -w net.core.somaxconn=-100 error: "Invalid argument" setting key "net.core.somaxconn" Based on a prior patch from Changli Gao. Signed-off-by: Roman Gushchin <klamm@yandex-team.ru> Reported-by: Changli Gao <xiaosuo@gmail.com> Suggested-by: Eric Dumazet <edumazet@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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