[Bug 4730] New: Integer overflow in util-linux/mkfs-minix.c

bugzilla at busybox.net bugzilla at busybox.net
Tue Jan 24 01:02:44 UTC 2012


           Summary: Integer overflow in util-linux/mkfs-minix.c
           Product: Busybox
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: abhijithoskeri at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0

There is an integer overflow in get_size() function for block devices greater
than 4G in size, which results in failure to create the minix filesystem. 

This failure happens only for block devices, which go down the BLKGETSIZE path,
and not for normal files.


$ stat /tmp/a
  File: `/tmp/a'
  Size: 4294967297    Blocks: 1408       IO Block: 4096   regular file
Device: 801h/2049d    Inode: 213866      Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/ abhijit)   Gid: ( 1000/ abhijit)
Access: 2012-01-23 13:56:34.000000000 -0800
Modify: 2012-01-23 13:56:26.000000000 -0800
Change: 2012-01-23 13:56:26.000000000 -0800

$ busybox mkfs.minix /tmp/a
21856 inodes
65535 blocks
Firstdatazone=696 (696)

$ sudo losetup -a
/dev/loop0: [0801]:213866 (/tmp/a)

$ sudo busybox mkfs.minix /dev/loop0
mkfs.minix: must have at least 10 blocks

This is on a 32bit linux system, with busybox built from latest git.

This problem can be worked around by passing the size in kbytes from the
command line.

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