On Tue, Aug 24, 2010 at 12:18:48PM +0100, Daniel P. Berrange wrote:
On Tue, Aug 24, 2010 at 12:02:38PM +0100, Daniel P. Berrange wrote:
A QEMU guest can have upto VIR_DOMAIN_BOOT_LAST boot entries defined. When building the QEMU arg, each entry takes a single byte. This means the array must be declared to be VIR_DOMAIN_BOOT_LAST+1 bytes in length to allow for the trailing null
FYI, This bug was introduced by me 2 years ago during the conversion to common domain APIs. In 6385fe3edebf4593b6dc08eee086f73dcc71b43d. We already have a test case that covers this precise boundary condition, but it has never exhibited a problem, even under valgrind. In Fedora 15 rawhide though, there is more advanced GCC array bounds checking present and this causes a runtime abort in the test suite. Nice example of why running 'make check' in the RPM spec is good :-)
There used to be a 'checker' version of gcc with specific patches for bound-checking a decade or so ago, good to see this coming to the main stream :-) Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/