On 04/19/2012 04:40 PM, Alex Jia wrote:
On 04/19/2012 04:19 PM, Wen Congyang wrote:
At 04/19/2012 04:09 PM, Alex Jia Wrote:
Detected by valgrind.
* tools/virsh.c (cmdBlockPull): fix uninitialized memory usage.
* How to reproduce?
$ qemu-img create /var/lib/libvirt/images/test 1M
$ cat> /tmp/test.xml<<EOF
<domain type='qemu'>
<name>test</name>
<memory>219200</memory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64'>hvm</type>
<boot dev='hd'/>
</os>
<devices>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/test'/>
<target dev='vda' bus='virtio'/>
</disk>
<input type='mouse' bus='ps2'/>
<graphics type='spice' autoport='yes' listen='0.0.0.0'/>
</devices>
</domain>
EOF
$ virsh define /tmp/test.xml
$ valgrind -v virsh blockpull test /var/lib/libvirt/images/test --wait
actual result:
==10906== 1 errors in context 1 of 1:
==10906== Syscall param rt_sigaction(act->sa_flags) points to
uninitialised byte(s)
==10906== at 0x39CF80F5BE: __libc_sigaction (sigaction.c:67)
==10906== by 0x43016C: cmdBlockPull (virsh.c:7638)
==10906== by 0x4150D4: vshCommandRun (virsh.c:18574)
==10906== by 0x425E73: main (virsh.c:20178)
==10906== Address 0x7fefffae8 is on thread 1's stack
Signed-off-by: Alex Jia<ajia@xxxxxxxxxx>
---
tools/virsh.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/tools/virsh.c b/tools/virsh.c
index 95ed7bc..4e4ca57 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -7634,6 +7634,7 @@ cmdBlockPull(vshControl *ctl, const vshCmd *cmd)
intCaught = 0;
sig_action.sa_sigaction = vshCatchInt;
+ sigemptyset((sigset_t *)&sig_action.sa_flags);
Why using sigemptyset here? You should use 'sig_action.sa_flags = 0'.
Yeah, I think 'sig_action.sa_flags = 0' is right, but I don't know
what the difference are,
could you explain more?
The sigemptyset() function manipulates sets of signals and initialize
signal set to be empty.
'sig_action.sa_flags = 0' is right and enough in here.
Thanks,
Alex
Thanks,
Alex
Thanks
Wen Congyang
sigemptyset(&sig_action.sa_mask);
sigaction(SIGINT,&sig_action,&old_sig_action);
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