Red Hat Bugzilla – Bug 1134251
Opening an obviously truncated VMDK image should fail
Last modified: 2015-03-05 03:11:25 EST
For those VMDK images that are even smaller than the value in header field "overhead", the files are obviously truncated and unusable. We can detect and error out this case: $ qemu-img create -f vmdk a.vmdk 4T Formatting 'a.vmdk', fmt=vmdk size=4398046511104 compat6=off zeroed_grain=off $ truncate a.vmdk --size 1M Current result: $ ~/build/rhel7/qemu-img info a.vmdk image: a.vmdk file format: vmdk virtual size: 4.0T (4398046511104 bytes) disk size: 520K Format specific information: cid: 1409125474 parent cid: 4294967295 create type: monolithicSparse extents: [0]: virtual size: 4398046511104 filename: a.vmdk cluster size: 65536 format: Expected result: $ qemu-img info a.vmdk qemu-img: Could not open 'a.vmdk': File truncated, expecting at least 537985024 bytes
Fix included in qemu-kvm-1.5.3-84.el7
Reproduce this issue: host info: # uname -r && rpm -q qemu-kvm 3.10.0-219.el7.x86_64 qemu-kvm-1.5.3-83.el7.x86_64 # qemu-img create -f vmdk a.vmdk 4T Formatting 'a.vmdk', fmt=vmdk size=4398046511104 compat6=off zeroed_grain=off # truncate a.vmdk --size 1M # qemu-img info a.vmdk image: a.vmdk file format: vmdk virtual size: 4.0T (4398046511104 bytes) disk size: 520K Format specific information: cid: 1419402502 parent cid: 4294967295 create type: monolithicSparse extents: [0]: virtual size: 4398046511104 filename: a.vmdk cluster size: 65536 format: Verify this issue: host info: # uname -r && rpm -q qemu-kvm 3.10.0-219.el7.x86_64 qemu-kvm-1.5.3-84.el7.x86_64 # qemu-img create -f vmdk a.vmdk 4T Formatting 'a.vmdk', fmt=vmdk size=4398046511104 compat6=off zeroed_grain=off # truncate a.vmdk --size 1M # qemu-img info a.vmdk qemu-img: Could not open 'a.vmdk': File truncated, expecting at least 537985024 bytes Base on above, this issue has been fixed correctly, move to VERIFIED status, please correct me if any mistake, thanks. Best Regards, sluo
Tried the qemu-kvm-rhev-2.1.2-17.el7.x86_64 which also did not have such issue. host info: # uname -r && rpm -q qemu-kvm-rhev 3.10.0-219.el7.x86_64 qemu-kvm-rhev-2.1.2-17.el7.x86_64 # qemu-img create -f vmdk a.vmdk 4T Formatting 'a.vmdk', fmt=vmdk size=4398046511104 compat6=off # truncate a.vmdk --size 1M # qemu-img info a.vmdk qemu-img: Could not open 'a.vmdk': File truncated, expecting at least 537985024 bytes Best Regards, sluo
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHSA-2015-0349.html