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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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