From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: Fix pthread_create on some devices failing to initialize guard area
Date: Wed, 1 Feb 2017 10:52:13 +0100 [thread overview]
Message-ID: <20170201095212.GC12395@port70.net> (raw)
In-Reply-To: <9a395da9-2b2a-8719-f12d-c140deb12e62@gmail.com>
* Eric Hassold <hassold@gmail.com> [2017-01-31 14:44:52 -0800]:
> On 1/31/17 1:18 PM, Eric Hassold wrote:
> > Long story short, no odd behavior of the mmap in kernel, but Musl not
> > supporting correctly non-4k page systems, impacting pthread_create but
> > probably also malloc and mprotect. Given non-4k page systems are getting
> > more and more common (on arm and arm64 architectures at least), this
> > might be an important issue to fix. Should I start new "support for
> > non-4k page systems" discussion here ?
> >
> > Eric
> >
> Just removing the "#define PAGE_SIZE 4096" from arch/arm/bits/limits.h makes
> PAGE_SIZE to be defined by internal/libc.h as libc.page_size which is
> initialized correctly at runtime, making the correct page size be used all
> around musl. Since a page size of 4k is no more a valid assumption on
> arm-linux target, is removing this compile time define a right fix?
it is ok to remove PAGE_SIZE but i thought arm elf
binaries would depend on the 4k page size.. making it
less useful to support other page sizes, but if 32k
works in practice then i think musl should support it.
i guess the boundary of unaligned sections will be
mapped twice which is not a big issue except may be
you don't get relro support if the readonly relocs
are 4k aligned.
next prev parent reply other threads:[~2017-02-01 9:52 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-20 19:45 Eric Hassold
2017-01-20 19:56 ` Rich Felker
2017-01-20 21:04 ` Eric Hassold
2017-01-20 21:29 ` Rich Felker
2017-01-20 22:42 ` Eric Hassold
2017-01-30 21:30 ` Eric Hassold
2017-01-30 23:13 ` Rich Felker
2017-01-31 2:52 ` Eric Hassold
2017-01-31 3:58 ` Rich Felker
2017-01-31 21:18 ` Eric Hassold
2017-01-31 22:44 ` Eric Hassold
2017-02-01 9:52 ` Szabolcs Nagy [this message]
2017-02-01 18:21 ` Eric Hassold
2017-02-01 18:35 ` Rich Felker
2017-02-01 18:52 ` Eric Hassold
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170201095212.GC12395@port70.net \
--to=nsz@port70.net \
--cc=musl@lists.openwall.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).