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Date: Fri, 06 Sep 2019 20:57:00 +0200
From: Florian Weimer <>
To: Steve Grubb <>
Cc: Mickaël Salaün <>,,  Aleksa
 Sarai <>,  Alexei Starovoitov <>,  Al Viro
 <>,  Andy Lutomirski <>,  Christian
 Heimes <>,  Daniel Borkmann <>,
  Eric Chiang <>,  James Morris <>,
  Jan Kara <>,  Jann Horn <>,  Jonathan Corbet
 <>,  Kees Cook <>,  Matthew Garrett
 <>,  Matthew Wilcox <>,  Michael
 Kerrisk <>,  Mickaël Salaün
 <>,  Mimi Zohar <>,  Philippe
 Trébuchet <>,  Scott Shell
 <>,  Sean Christopherson
 <>,  Shuah Khan <>,  Song
 Liu <>,  Steve Dower <>,
  Thibaut Sautereau <>,  Vincent Strubel
 <>,  Yves-Alexis Perez
Subject: Re: [PATCH v2 0/5] Add support for O_MAYEXEC

* Steve Grubb:

> Now with LD_AUDIT
> $ LD_AUDIT=/home/sgrubb/test/openflags/ strace ./test 2>&1 | grep passwd
> openat(3, "passwd", O_RDONLY)           = 4
> No O_CLOEXEC flag.

I think you need to explain in detail why you consider this a problem.

With LD_PRELOAD and LD_AUDIT, you can already do anything, including
scanning other loaded objects for a system call instruction and jumping
to that (in case a security module in the kernel performs a PC check to
confer additional privileges).


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