Steps to reproduce: Server: [EMAIL PROTECTED] ~]# cat /etc/exports /export *(ro,insecure) // there is insecure ... I am using ports like "1024 to 61000" [EMAIL PROTECTED] ~] service nfs restart
Client:
[EMAIL PROTECTED] ~]# echo 32768 32768 >
/proc/sys/net/ipv4/ip_local_port_range
32768 32768
// two same numbers, for ex "32769 32769" etc.
[EMAIL PROTECTED] ~]# cat /proc/sys/net/ipv4/ip_local_port_range
32768 32768
[EMAIL PROTECTED] ~]# mount server:/export /import
Actual results:
Kernel always panics
--------------------------------------------------------------------
[PATCH] ipv4: kernel panic when only one unsecured port available
Patch prevents division by zero. Kernel panics if only one
unsecured port available.
Signed-off-by: Anton Arapov <[EMAIL PROTECTED]>
---
net/ipv4/inet_connection_sock.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index fbe7714..00ad079 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -80,7 +80,7 @@ int inet_csk_get_port(struct inet_hashinfo *hashinfo,
int low = sysctl_local_port_range[0];
int high = sysctl_local_port_range[1];
int remaining = (high - low) + 1;
- int rover = net_random() % (high - low) + low;
+ int rover = net_random() % remaining + low;
do {
head = &hashinfo->bhash[inet_bhashfn(rover,
hashinfo->bhash_size)];
--
Anton Arapov, <[EMAIL PROTECTED]>
Kernel Development, Red Hat
GPG Key ID: 0x6FA8C812
pgp0y91epZLHV.pgp
Description: PGP signature
