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Date: Tue,  2 Aug 2016 19:48:18 -0400 (EDT)
From: cve-assign@...re.org
To: jesse.hertz@...group.trust
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, Tim.Newsham@...group.trust
Subject: Re: CVE Request: Denial-of-Service / Unexploitable Memory Corruption in mmap() on OpenBSD

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> Any user can trigger a panic by requesting a large mapping
> that overlaps with an existing mapping.

> There is a flaw in uvm_map_isavail() when the requested size is very
> large.

> Due to an integer overflow that can occur when computing
> "addr + sz" it is possible for the end_ptr map to be
> computed incorrectly

> eventually call uvm_map_fix_space() which
> performs its own sanity lookup with uvm_mapent_addr_insert(),
> and panics if an overlapping mapping is added

> it does not appear to be possible
> to make a mapping above the stack segment. All wrap-around mappings
> lower than this address overlap with the stack segment and result
> in a panic.

>     pg = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

>     p = mmap(pg+4096, 0xffffff0000000000, 0, 0, fd, 0);

Use CVE-2016-6522.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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