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Re: [Xen-devel] [PATCH] libxc hardening




On 23 Jun 2005, at 05:15, Anthony Liguori wrote:

The following patches hardens a good portion of libxc's error path code against errno clobbering. Errno clobbering occurs when a function returns a failure code (such as -1) but then calls some other function (like munmap or perror) that could potentially change the value of errno.

mmap() will never return NULL address (according to the man page). I guess you might be able to force it with MAP_FIXED, but no sane mmap implementation would ever automatically choose NULL as a reasonable valid return address. :-)

 -- Keir


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