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Date: Tue, 8 Jun 2021 19:06:53 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Arnd Bergmann <arnd@kernel.org>
Cc: stable@vger.kernel.org, Michael Weiser <michael.weiser@gmx.de>,
	Martin Vajnar <martin.vajnar@gmail.com>, musl@lists.openwall.com,
	Will Deacon <will.deacon@arm.com>, Arnd Bergmann <arnd@arndb.de>
Message-ID: <YL+jrRKPCgoDtQ1r@kroah.com>
References: <20210602114651.423605-1-arnd@kernel.org>
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In-Reply-To: <20210602114651.423605-1-arnd@kernel.org>
Subject: [musl] Re: [PATCH] [stable v4.4] arm64: Remove unimplemented syscall log
 message

On Wed, Jun 02, 2021 at 01:46:51PM +0200, Arnd Bergmann wrote:
> From: Michael Weiser <michael.weiser@gmx.de>
> 
> commit 1962682d2b2fbe6cfa995a85c53c069fadda473e upstream.
> 
> Stop printing a (ratelimited) kernel message for each instance of an
> unimplemented syscall being called. Userland making an unimplemented
> syscall is not necessarily misbehaviour and to be expected with a
> current userland running on an older kernel. Also, the current message
> looks scary to users but does not actually indicate a real problem nor
> help them narrow down the cause. Just rely on sys_ni_syscall() to return
> -ENOSYS.
> 
> Cc: <stable@vger.kernel.org>
> Cc: Martin Vajnar <martin.vajnar@gmail.com>
> Cc: musl@lists.openwall.com
> Acked-by: Will Deacon <will.deacon@arm.com>
> Signed-off-by: Michael Weiser <michael.weiser@gmx.de>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> This was backported to v4.14 and later, but is missing in v4.4 and
> before, apparently because of a trivial merge conflict. This is
> a manual backport I did after I saw a report about the issue
> by Martin Vajnar on the musl mailing list.
> ---
>  arch/arm64/kernel/traps.c | 8 --------
>  1 file changed, 8 deletions(-)

Now queued up, thanks.

greg k-h