From: Christoph Hellwig <hch@infradead.org>
To: "Christopher M. Riedl" <cmr@codefail.de>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
viro@zeniv.linux.org.uk
Subject: Re: [PATCH 1/8] powerpc/uaccess: Add unsafe_copy_from_user
Date: Fri, 16 Oct 2020 07:54:03 +0100 [thread overview]
Message-ID: <20201016065403.GA9343@infradead.org> (raw)
In-Reply-To: <20201015150159.28933-2-cmr@codefail.de>
On Thu, Oct 15, 2020 at 10:01:52AM -0500, Christopher M. Riedl wrote:
> Implement raw_copy_from_user_allowed() which assumes that userspace read
> access is open. Use this new function to implement raw_copy_from_user().
> Finally, wrap the new function to follow the usual "unsafe_" convention
> of taking a label argument. The new raw_copy_from_user_allowed() calls
> __copy_tofrom_user() internally, but this is still safe to call in user
> access blocks formed with user_*_access_begin()/user_*_access_end()
> since asm functions are not instrumented for tracing.
Please also add a fallback unsafe_copy_from_user to linux/uaccess.h
so this can be used as a generic API.
next parent reply other threads:[~2020-10-16 6:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201015150159.28933-1-cmr@codefail.de>
[not found] ` <20201015150159.28933-2-cmr@codefail.de>
2020-10-16 6:54 ` Christoph Hellwig [this message]
2020-10-16 13:18 ` Christophe Leroy
[not found] ` <20201015150159.28933-4-cmr@codefail.de>
2020-10-16 6:56 ` [PATCH 3/8] powerpc: Mark functions called inside uaccess blocks w/ 'notrace' Christoph Hellwig
2020-10-16 9:41 ` Peter Zijlstra
2020-10-20 7:34 ` Michael Ellerman
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