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Re: [Qemu-trivial] [Qemu-devel] [PATCH v2] linux-user: fix is_proc_mysel

From: Zach Riggle
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH v2] linux-user: fix is_proc_myself to check the paths via realpath
Date: Thu, 02 Nov 2017 18:26:35 +0000

Ping. What changes do I need to make to land this?
On Sat, Oct 28, 2017 at 12:49 AM Eric Blake <address@hidden> wrote:
On 10/27/2017 09:07 PM, Zach Riggle wrote:
> Another case that may be more relevant for general QEMU use, is that the
> current code fails if the software under test has poor path-handling code.
> For example, any of
> - //proc/self/maps
> - /proc//self/maps
> - /proc/self//maps
> Will all return the non-emulated results.  Those examples are just path
> canonicalization issues and could be resolved with e.g.
> canonicalize_file_name, but I'm not sure if QEMU allows GNU extensions --
> and realpath() is portable.

By definition, in linux-user, we ARE using glibc; therefore, you are
free to use all GNU extensions.

And you'd be surprised at how many non-glibc implementations of
realpath() are not POSIX-compliant, even though that is not relevant here.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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