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


From: Eric Blake
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH v2] linux-user: fix is_proc_myself to check the paths via realpath
Date: Sat, 28 Oct 2017 07:14:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

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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