mount_nfs does not like exports longer then 88 chars

[Andrew Duane]

MNAMELEN is used to bound the Mount NAMe LENgth, and is used in many many places. It may seem to work fine, but there are lots of utilities and such that will almost certainly fail managing it. Search the source code for MNAMELEN.....

 ...................................
Andrew Duane
Juniper Networks
+1 978-589-0551 (o)
+1 603-770-7088 (m)
aduane at juniper.net

 


> -----Original Message-----
> From: owner-freebsd-hackers at freebsd.org [mailto:owner-freebsd-
> hackers at freebsd.org] On Behalf Of Mark Saad
> Sent: Thursday, April 19, 2012 3:46 PM
> To: freebsd-hackers at freebsd.org
> Subject: mount_nfs does not like exports longer then 88 chars
> 
> Hello Hackers
>   I was wondering if anyone has come across this issue. This exists in
> FreeBSD 6, 7, and 9 , and probably in 8 but I am not using it at this time.
> When a nfs export path and host name total to more then 88 characters
> mount_nfs bombs out with the following error when it attempts to mount it.
> 
> mount_nfs: nyisilon2-13.grp2:/ifs/clients/www/csar884520456/files_cms- stage-BK/imagefield_default_images:
> File name too long
> 
> I traced this down to a check in mount_nfs.c . This is about line 560
> in the 7-STABLE version  and  734 in the 9-STABLE version
> 
> 
>         /*
>          * If there has been a trailing slash at mounttime it seems
>          * that some mountd implementations fail to remove the mount
>          * entries from their mountlist while unmounting.
>          */
>         for (speclen = strlen(spec);
>                 speclen > 1 && spec[speclen - 1] == '/';
>                 speclen--)
>                 spec[speclen - 1] = '\0';
>         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
>                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
>                 return (0);
>         }
> 
> Does any one know why the check for hostp + spec +1 to be less then
> MNAMELEN is there for ?
> 
>  I removed the check on my 9-STABLE box and it mounts the long mounts fine
> 
> I submitted a pr for this its kern/167105
> http://www.freebsd.org/cgi/query-pr.cgi?pr=167105 as there is no
> mention of this in the man page and I cant find any reason for the check at all.
> 
> 
> --
> mark saad | nonesuch at longcount.org
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