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From: Peter Maydell <peter.maydell@linaro.org>
To: Eric Blake <eblake@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>,
	Richard Henderson <richard.henderson@linaro.org>,
	QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] linux-user: Use *at functions to implement interp_prefix
Date: Tue, 13 Feb 2018 16:50:11 +0000	[thread overview]
Message-ID: <CAFEAcA_NXwhfJjJnihZdCHAL7A-ZntuNDgrpPkQQDycuMOkdgw@mail.gmail.com> (raw)
In-Reply-To: <CAFEAcA-xRtcaRA6_ApZ2Ohfpz0ZCED1y3SyLpGCOWThPFpUr_Q@mail.gmail.com>

On 13 February 2018 at 16:43, Peter Maydell <peter.maydell@linaro.org> wrote:
> OTOH, maybe we should just go ahead without weird games with dup2 and
> see whether any real code gets confused...

Here's some real-world code that would break with this patch
as it stands, though dup2 games wouldn't be the fix in this case:
 https://github.com/xinetd-org/xinetd/blob/master/xinetd/init.c#L79

(it iterates through all fds above 2 closing them, and we don't
protect against the guest being able to perform syscalls on
interp_dirfd)

thanks
-- PMM

  reply	other threads:[~2018-02-13 16:50 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-28 22:15 [Qemu-devel] [PATCH] linux-user: Use *at functions to implement interp_prefix Richard Henderson
2018-01-28 22:20 ` no-reply
2018-02-13 12:12 ` Peter Maydell
2018-02-13 15:31   ` Richard Henderson
2018-02-13 16:38     ` Eric Blake
2018-02-13 16:43       ` Peter Maydell
2018-02-13 16:50         ` Peter Maydell [this message]
2018-02-13 17:22           ` Richard Henderson

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