linux-kernel - Re: [PATCH 0/7] Fix CLONE

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Message-ID: <20200102181112.rc3vnxxm2erl36ep@wittgenstein>
Date:   Thu, 2 Jan 2020 19:11:13 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Amanieu d'Antras <amanieu@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        stable@...r.kernel.org
Subject: Re: [PATCH 0/7] Fix CLONE_SETTLS with clone3

On Thu, Jan 02, 2020 at 06:24:06PM +0100, Amanieu d'Antras wrote:
> The clone3 syscall is currently broken when used with CLONE_SETTLS on all
> architectures that don't have an implementation of copy_thread_tls. The old
> copy_thread function handles CLONE_SETTLS by reading the new TLS value from
> pt_regs containing the clone syscall parameters. Since clone3 passes the TLS
> value in clone_args, this results in the TLS register being initialized to a
> garbage value.
> 
> This patch series implements copy_thread_tls on all architectures that currently
> define __ARCH_WANT_SYS_CLONE3 and adds a compile-time check to ensure that any
> architecture that enables clone3 in the future also implements copy_thread_tls.
> 
> I have also included a minor fix for the arm64 uapi headers which caused
> __NR_clone3 to be missing from the exported user headers.
> 
> I have only tested this on arm64, but the copy_thread_tls implementations for
> the various architectures are fairly straightforward.

The series looks straightforward to me but I'd like a few Acks from some
of the arch maintainers before taking this.

Acked-by: Christian Brauner <christian.brauner@...ntu.com>