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exec: Check for errors when mapping the shared object
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Authored by markj on Mon, Oct 13, 12:54 PM.
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Summary

In the non-ASLR case, there is no check for an error from
vm_map_fixed(). Restore it, it was dropped in commit 939f0b6323e0a.

Fixes: 939f0b6323e0 ("Implement shared page address randomization")
Reported by: Ilja Van Sprundel <ivansprundel@ioactive.com>

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rG FreeBSD src repository
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