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Message-ID: <20170109111351.GI17692@port70.net>
Date: Mon, 9 Jan 2017 12:13:52 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] malloc: always fail with ENOMEM
* Julien Ramseier <j.ramseier@...il.com> [2017-01-09 09:47:35 +0100]:
> malloc may set errno to something else than ENOMEM indirectly
> through mmap, though ENOMEM is the only error allowed by POSIX.
>
> There are cases where mmap will return EPERM instead of ENOMEM,
> as highlighted by libc-test[1]. This can happen when mmap tries to
> map pages near `mmap_min_addr` [2][3], as a security measure.
i've seen this too and i think this should be fixed in mmap
(i.e. never return EPERM for anonymous mmap(0,...), since
posix specifies ENOMEM for that failure)
>
> [1] http://www.openwall.com/lists/musl/2016/03/30/9
> [2] https://ghc.haskell.org/trac/ghc/ticket/7500
> [3] https://github.com/torvalds/linux/blob/master/security/min_addr.c
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