[Bug 273956] KERN_PROC_VMMAP does not read all mapped files

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273956

--- Comment #16 from Paul Floyd <pjfloyd@wanadoo.fr> ---
(In reply to Ed Maste from comment #15)

I can't think of anything that would have changed the size of the RW PT_LOAD,
though it might have been a small change that tipped the scales. I can now
reproduce the same thing on FreeBSD 13.2 with my dev build.

Because the code has to deal with libraries that ldrt and dlopen load it is
quite fussy in making sure that the start/end/size/offset are all consistent.
It's easy to get most of the info for the RW PT_LOAD (all but the offset and
the prot mode are the same as the preceding RX PT_LOAD). I don't know whether
I'll be able to regenerate an offset that satisfies the checks. "prev offset +
current size" is close, but the figures that I get from sysctl KERN_PROC_VMMAP
are rounded to page boundaries.

If I can't figure out a robust way to regenerate the offset then I'll add an
"ignore offset" flag.

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