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From:   John Watts <contact@jookia.org>
To:     Alejandro Colomar <alx@kernel.org>
Cc:     Sargun Dhillon <sargun@sargun.me>, linux-man@vger.kernel.org
Subject: Re: [PATCH] clone.2: Fix the erroneous statement about CLONE_NEWPID
Message-ID: <ZNfX5ilXYK3Ut8Tr@titan>
References: <20230810022603.947583-1-sargun@sargun.me>
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On Sat, Aug 12, 2023 at 07:51:43PM +0200, Alejandro Colomar wrote:
> Does this depend on any recent kernel version?  In my system,
> the assertion fails.
> 
> 
> $ cat clone.c 
> ...
> 
> $ cc -Wall -Wextra clone.c 
> $ ./a.out 
> main program:  pid: 18783, and ppid: 18703
> a.out: clone.c:24: main: Assertion `ret != -1' failed.
> Aborted

On my systerm I get the same result. strace says this:

clone3({flags=CLONE_PARENT|CLONE_NEWPID, exit_signal=0, stack=NULL, stack_size=0}, 88) = -1 EPERM (Operation not permitted)

However when running as root it works.

John.