[Xen-devel] [PATCH] make pygrub cope better with big files in guest

[M A Young <m.a.young@xxxxxxxxxxxx>]

Pygrub can use a lot of memory if the kernel or ramdisk files in a guest 
are very big as it reads them into memory before writing them out again to 
temporary files (these can legitimately be big for example the initrd.img 
file in a Fedora 16 install is around 130MB ).
This patch allows these files to be copied in one megabyte pieces, and if 
it sees any write problems it delets the files and exits. It also only 
reads up to the first megabyte of configurations files for grub etc. to 
avoid problems here as well (as it is a text file it should actually be 
much smaller).
This issue was reported by Xinli Niu in the Fedora bug report
https://bugzilla.redhat.com/show_bug.cgi?id=818412 who got it a CVE 
reference CVE-2012-2625 .
        Michael Young

Attachment: pygrub.size.limits.patch
Description: Text document

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