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Re: [PATCH] linux: spawni.c: simplify error reporting to parent

From: Andreas Schwab <schwab at suse dot de>
To: Rich Felker <dalias at libc dot org>
Cc: Rasmus Villemoes <rv at rasmusvillemoes dot dk>, libc-alpha at sourceware dot org, Florian Weimer <fw at deneb dot enyo dot de>, Adhemerval Zanella <adhemerval dot zanella at linaro dot org>, Joseph Myers <joseph at codesourcery dot com>
Date: Wed, 28 Sep 2016 17:03:41 +0200
Subject: Re: [PATCH] linux: spawni.c: simplify error reporting to parent
Authentication-results: sourceware.org; auth=none
References: <877fa6nwsl.fsf@mid.deneb.enyo.de> <1474405260-16657-1-git-send-email-rv@rasmusvillemoes.dk> <20160928141415.GI19318@brightrain.aerifal.cx>

On Sep 28 2016, Rich Felker <dalias@libc.org> wrote:

> This is a bad idea for at least one reason: running under strace seems
> to cause vfork _not_ to wait in the parent, leading to stack
> clobbering and runaway wrong code execution.

This is not true.  With modern kernels implementing ptrace events a
tracer can correctly handle all clone variants including vfork.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

Follow-Ups:
- Re: [PATCH] linux: spawni.c: simplify error reporting to parent
  - From: Rich Felker

References:
- Re: [PATCH v2 3/3] posix: New Linux posix_spawn{p} implementation
  - From: Florian Weimer
- [PATCH] linux: spawni.c: simplify error reporting to parent
  - From: Rasmus Villemoes
- Re: [PATCH] linux: spawni.c: simplify error reporting to parent
  - From: Rich Felker

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