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| author | Roman Gushchin <klamm@yandex-team.ru> | 2013-08-02 16:36:40 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-03 00:18:53 +0200 |
| commit | 5f671d6b4ec3e6d66c2a868738af2cdea09e7509 (patch) | |
| tree | b117717db9f3b70118095c0e12a0acb1daad5591 /net/netlabel/netlabel_domainhash.c | |
| parent | sis900: Fix the tx queue timeout issue (diff) | |
| download | linux-5f671d6b4ec3e6d66c2a868738af2cdea09e7509.tar.xz linux-5f671d6b4ec3e6d66c2a868738af2cdea09e7509.zip | |
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>
Diffstat (limited to 'net/netlabel/netlabel_domainhash.c')
0 files changed, 0 insertions, 0 deletions