linux-kernel - Re: [PATCH] seccomp.2: Clarify that bad system calls kill the thread

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Date:   Wed, 30 Jun 2021 16:06:56 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Michael Kerrisk <mtk.manpages@...il.com>,
        linux-api@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, linux-man@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] seccomp.2:  Clarify that bad system calls kill the thread

On Wed, Jun 30, 2021 at 03:11:23PM -0500, Eric W. Biederman wrote:
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
> ---
>  man2/seccomp.2 | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/man2/seccomp.2 b/man2/seccomp.2
> index a3421871f0f4..bde54c3e3e99 100644
> --- a/man2/seccomp.2
> +++ b/man2/seccomp.2
> @@ -69,9 +69,10 @@ The only system calls that the calling thread is permitted to make are
>  .BR exit_group (2)),
>  and
>  .BR sigreturn (2).
> -Other system calls result in the delivery of a
> +Other system calls result in the termination of the calling thread,
> +or termination of the entire process with the
>  .BR SIGKILL
> -signal.
> +signal when there is only one thread.
>  Strict secure computing mode is useful for number-crunching
>  applications that may need to execute untrusted byte code, perhaps
>  obtained by reading from a pipe or socket.

Thanks!

Acked-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook