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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-07-24 00:11:56 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-07-28 10:58:18 -0700 |
| commit | 5564d385e9b0cddc7c831af9f90a2f53aa472953 (patch) | |
| tree | 6773970d5abeb7bd8ec2df1a766ce3171b926f67 | |
| parent | b5fe255cb6adab0cfe9826ce792d0f866323b269 (diff) | |
udplite: Protection against coverage value wrap-around
[ Upstream commit 47112e25da41d9059626033986dc3353e101f815 ]
This patch clamps the cscov setsockopt values to a maximum of 0xFFFF.
Setsockopt values greater than 0xffff can cause an unwanted
wrap-around. Further, IPv6 jumbograms are not supported (RFC 3838,
3.5), so that values greater than 0xffff are not even useful.
Further changes: fixed a typo in the documentation.
[ Add USHORT_MAX from upstream to linux/kernel.h -DaveM ]
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | Documentation/networking/udplite.txt | 2 | ||||
| -rw-r--r-- | include/linux/kernel.h | 1 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 4 |
3 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/networking/udplite.txt b/Documentation/networking/udplite.txt index 3870f280280b..855d8da57a23 100644 --- a/Documentation/networking/udplite.txt +++ b/Documentation/networking/udplite.txt @@ -148,7 +148,7 @@ getsockopt(sockfd, SOL_SOCKET, SO_NO_CHECK, &value, ...); is meaningless (as in TCP). Packets with a zero checksum field are - illegal (cf. RFC 3828, sec. 3.1) will be silently discarded. + illegal (cf. RFC 3828, sec. 3.1) and will be silently discarded. 4) Fragmentation diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 2df44e773270..689026472306 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -20,6 +20,7 @@ extern const char linux_banner[]; extern const char linux_proc_banner[]; +#define USHORT_MAX ((u16)(~0U)) #define INT_MAX ((int)(~0U>>1)) #define INT_MIN (-INT_MAX - 1) #define UINT_MAX (~0U) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 1704c1474ea1..9703c870f1df 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1325,6 +1325,8 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname, return -ENOPROTOOPT; if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ val = 8; + else if (val > USHORT_MAX) + val = USHORT_MAX; up->pcslen = val; up->pcflag |= UDPLITE_SEND_CC; break; @@ -1337,6 +1339,8 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname, return -ENOPROTOOPT; if (val != 0 && val < 8) /* Avoid silly minimal values. */ val = 8; + else if (val > USHORT_MAX) + val = USHORT_MAX; up->pcrlen = val; up->pcflag |= UDPLITE_RECV_CC; break; |