[Libvir] [PATCH] output virsh log to file

Richard W.M. Jones rjones at redhat.com
Wed May 16 10:52:53 UTC 2007

Actually I had a closer look at this patch, and there are some problems 
(thanks to Jim Meyering who pointed these out).  For example:

Using sprintf into a fixed size message buffer with no other checks may 
cause a buffer overflow:

+    sprintf(msg_buf, "[%d.%02d.%02d %02d:%02d:%02d ",

You should check the return value of write:

+    /* write log */
+    write(logdef.log_fd, msg_buf, msg_len);

You don't need to zero out the stat structure before calling stat:

+    memset(&st, 0x00, sizeof(struct stat));
+    if (stat(logdef.path_buff, &st) == 0) {

What happens if this call fails?

+            rename(logdef.path_buff, bak_new_path);

But my broader point is: What use would this feature be, since you can 
capture the output of virsh easily using shell redirection?  The Xen 
'xm' command doesn't have this feature and I don't know if anyone has 
asked for it.


Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/
Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod
Street, Windsor, Berkshire, SL4 1TE, United Kingdom.  Registered in
England and Wales under Company Registration No. 03798903
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 3237 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20070516/8974f3d4/attachment-0001.bin>

More information about the libvir-list mailing list