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DescriptionMarkus Armbruster
2013-06-04 08:36:08 UTC
Description of problem:
When you ask acl_add to insert a rule before the last rule in the
list, it appends to the list instead.
How reproducible:
Always
Steps to Reproduce:
1. qemu-kvm -nodefaults -S -vnc :0,acl,sasl -monitor stdio
2. Monitor commands:
acl_show vnc.username
acl_add vnc.username drei allow
acl_show vnc.username
acl_add vnc.username zwei allow 1
acl_show vnc.username
acl_add vnc.username eins allow 1
acl_show vnc.username
Actual results:
(qemu) acl_show vnc.username
policy: deny
(qemu) acl_add vnc.username drei allow
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow drei
(qemu) acl_add vnc.username zwei allow 1
acl: added rule at position 2
(qemu) acl_show vnc.username
policy: deny
1: allow drei
2: allow zwei
(qemu) acl_add vnc.username eins allow 1
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow eins
2: allow drei
3: allow zwei
Expected results:
The second acl_add inserts at position 1, with final result
policy: deny
1: allow eins
2: allow zwei
3: allow drei
Additional info:
Upstream misbehaves the same.
Root cause is an off-by-one in qemu_acl_insert(): when index ==
acl->nentries, it appends instead of inserting before the last list
element.
Reproduce this bug on qemu-kvm-0.12.1.2-2.376.el6.x86_64
[root@localhost qemu-kvm-376]# rpm -qa |grep qemu
gpxe-roms-qemu-0.9.7-6.10.el6.noarch
qemu-kvm-tools-0.12.1.2-2.376.el6.x86_64
qemu-kvm-0.12.1.2-2.376.el6.x86_64
qemu-kvm-debuginfo-0.12.1.2-2.376.el6.x86_64
qemu-img-0.12.1.2-2.376.el6.x86_64
Steps to Reproduce:
1. /usr/libexec/qemu-kvm -nodefaults -S -vnc :0,acl,sasl -monitor stdio
2. Monitor commands:
acl_show vnc.username
acl_add vnc.username drei allow
acl_show vnc.username
acl_add vnc.username zwei allow 1
acl_show vnc.username
acl_add vnc.username eins allow 1
acl_show vnc.username
Actual results:
[root@localhost ~]# /usr/libexec/qemu-kvm -nodefaults -S -vnc :0,acl,sasl -monitor stdio
QEMU 0.12.1 monitor - type 'help' for more information
(qemu) acl_show vnc.username
policy: deny
(qemu) acl_add vnc.username drei allow
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow drei
(qemu) acl_add vnc.username zwei allow 1
acl: added rule at position 2
(qemu) acl_show vnc.username
policy: deny
1: allow drei
2: allow zwei
(qemu) acl_add vnc.username eins allow 1
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow eins
2: allow drei
3: allow zwei
(qemu)
Expected results:
The second acl_add inserts at position 1, with final result
policy: deny
1: allow eins
2: allow zwei
3: allow drei
Verify this bug on qemu-kvm-0.12.1.2-2.400.el6.x86_64 .
Steps to Reproduce:
1. /usr/libexec/qemu-kvm -nodefaults -S -vnc :0,acl,sasl -monitor stdio
2. Monitor commands:
acl_show vnc.username
acl_add vnc.username drei allow
acl_show vnc.username
acl_add vnc.username zwei allow 1
acl_show vnc.username
acl_add vnc.username eins allow 1
acl_show vnc.username
Actual results:
[root@localhost ~]# /usr/libexec/qemu-kvm -nodefaults -S -vnc :0,acl,sasl -monitor stdio
QEMU 0.12.1 monitor - type 'help' for more information
(qemu) acl_show vnc.username
policy: deny
(qemu) acl_add vnc.username drei allow
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow drei
(qemu) acl_add vnc.username zwei allow 1
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow zwei
2: allow drei
(qemu) acl_add vnc.username eins allow 1
acl: added rule at position 1
(qemu) acl_show vnc.username
policy: deny
1: allow eins
2: allow zwei
3: allow drei
(qemu)
So this bug has been fixed.
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.
http://rhn.redhat.com/errata/RHSA-2013-1553.html
Description of problem: When you ask acl_add to insert a rule before the last rule in the list, it appends to the list instead. How reproducible: Always Steps to Reproduce: 1. qemu-kvm -nodefaults -S -vnc :0,acl,sasl -monitor stdio 2. Monitor commands: acl_show vnc.username acl_add vnc.username drei allow acl_show vnc.username acl_add vnc.username zwei allow 1 acl_show vnc.username acl_add vnc.username eins allow 1 acl_show vnc.username Actual results: (qemu) acl_show vnc.username policy: deny (qemu) acl_add vnc.username drei allow acl: added rule at position 1 (qemu) acl_show vnc.username policy: deny 1: allow drei (qemu) acl_add vnc.username zwei allow 1 acl: added rule at position 2 (qemu) acl_show vnc.username policy: deny 1: allow drei 2: allow zwei (qemu) acl_add vnc.username eins allow 1 acl: added rule at position 1 (qemu) acl_show vnc.username policy: deny 1: allow eins 2: allow drei 3: allow zwei Expected results: The second acl_add inserts at position 1, with final result policy: deny 1: allow eins 2: allow zwei 3: allow drei Additional info: Upstream misbehaves the same. Root cause is an off-by-one in qemu_acl_insert(): when index == acl->nentries, it appends instead of inserting before the last list element.