linux-kernel - Re: linux-next: manual merge of the userns tree with the arm tree

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Date:   Wed, 6 Jun 2018 10:16:23 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Russell King <rmk@...linux.org.uk>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: manual merge of the userns tree with the arm tree

Hi all,

On Wed, 30 May 2018 18:30:58 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Today's linux-next merge of the userns tree got a conflict in:
> 
>   arch/arm/mm/fault.c
> 
> between commit:
> 
>   93a24d7e23e7 ("ARM: spectre-v2: harden user aborts in kernel space")
> 
> from the arm tree and commit:
> 
>   3eb0f5193b49 ("signal: Ensure every siginfo we send has all bits initialized")
> 
> from the userns tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> -- 
> Cheers,
> Stephen Rothwell
> 
> diff --cc arch/arm/mm/fault.c
> index 3b1ba003c4f9,32034543f49c..000000000000
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@@ -163,9 -163,8 +163,11 @@@ __do_user_fault(struct task_struct *tsk
>   {
>   	struct siginfo si;
>   
>  +	if (addr > TASK_SIZE)
>  +		harden_branch_predictor();
>  +
> + 	clear_siginfo(&si);
> + 
>   #ifdef CONFIG_DEBUG_USER
>   	if (((user_debug & UDBG_SEGV) && (sig == SIGSEGV)) ||
>   	    ((user_debug & UDBG_BUS)  && (sig == SIGBUS))) {

This is now a conflict between the arm tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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