This code is broken from the very beginning.
iris den # cat /proc/sys/net/ipv4/ip_local_port_range
32768 61000
iris den # echo 32768 32 >/proc/sys/net/ipv4/ip_local_port_range
iris den # cat /proc/sys/net/ipv4/ip_local_port_range
32768 32
iris den # echo 32768 61000 >/proc/sys/net/ipv4/ip_local_port_range
Regards,
Den
Anton Arapov wrote:
> 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)];
>
-
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