[Cluster-devel] [PATCH] mkfs.gfs2: Check locktable more strictly for valid chars

[Andrew Price <anprice@redhat.com>]

On 15/10/12 10:46, Steven Whitehouse wrote:
> Hi,
>
> Looks good. Should we also be limiting the number of : to just one I
> wonder?

That's already taken care of with a check a bit further down in that 
function:

         if (strstr(c, ":"))
                 die( _("locktable error: more than one colon present\n"));

Andy

>
> Steve.
>
> On Fri, 2012-10-12 at 15:37 +0100, Andrew Price wrote:
>> Previously mkfs.gfs2 allowed any printable characters to be used in the
>> locktable name. This causes problems when the locktable contains special
>> characters such as '/'. This patch limits the locktable to alphanumeric
>> characters plus hyphens and underscores.
>>
>> Ref: bz#862847
>>
>> Signed-off-by: Andrew Price <anprice@redhat.com>
>> ---
>>   gfs2/man/mkfs.gfs2.8  | 3 ++-
>>   gfs2/mkfs/main_mkfs.c | 6 ++----
>>   2 files changed, 4 insertions(+), 5 deletions(-)
>>
>> diff --git a/gfs2/man/mkfs.gfs2.8 b/gfs2/man/mkfs.gfs2.8
>> index d17e272..4613305 100644
>> --- a/gfs2/man/mkfs.gfs2.8
>> +++ b/gfs2/man/mkfs.gfs2.8
>> @@ -73,7 +73,8 @@ Clustername must match that in cluster.conf; only members of this
>>   cluster are permitted to use this file system.
>>   Fsname is a unique file system name used to distinguish this GFS2 file
>>   system from others created (1 to 16 characters).  Lock_nolock doesn't
>> -use this field.
>> +use this field. Valid \fIclustername\fRs and \fIfsname\fRs may only contain
>> +alphanumeric characters, hyphens (-) and underscores (_).
>>   .TP
>>   \fB-V\fP
>>   Print program version information, then exit.
>> diff --git a/gfs2/mkfs/main_mkfs.c b/gfs2/mkfs/main_mkfs.c
>> index 2d529d7..3bbb5b4 100644
>> --- a/gfs2/mkfs/main_mkfs.c
>> +++ b/gfs2/mkfs/main_mkfs.c
>> @@ -259,10 +259,8 @@ static void test_locking(char *lockproto, char *locktable)
>>   			exit(-1);
>>   		}
>>   		for (c = locktable; *c; c++) {
>> -			if (isspace(*c))
>> -				die( _("locktable error: contains space characters\n"));
>> -			if (!isprint(*c))
>> -				die( _("locktable error: contains unprintable characters\n"));
>> +			if (!isalnum(*c) && (*c != '-') && (*c != '_') && (*c != ':'))
>> +				die( _("locktable error: invalid character '%c'\n"), *c);
>>   		}
>>
>>   		c = strstr(locktable, ":");
>
>