[PATCH] [BZ #18433] Check file access/existence before forking.

[Mike Frysinger]

doing an access/stat/whatever doesn't solve the issue you described --
as others have pointed out, there's a TOCTOU race, but there's also no
guarantee that doing a stat/access on mode bits means you can actually
execute that file and/or that the exec will succeed.  since this doesn't
actually fix the problem you've described (and others have pointed out
that it's not a spec violation), then this patch as-is is dead.
-mike
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