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Date:   Wed, 27 May 2020 17:55:47 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Christoph Hellwig <hch@lst.de>
Cc:     x86@kernel.org, Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-parisc@vger.kernel.org, linux-um@lists.infradead.org,
        netdev@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/23] maccess: unify the probe kernel arch hooks
Message-Id: <20200527175547.0260fb90d76734d4e0f56def@linux-foundation.org>
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        <20200521152301.2587579-11-hch@lst.de>
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On Thu, 21 May 2020 17:22:48 +0200 Christoph Hellwig <hch@lst.de> wrote:

> Currently architectures have to override every routine that probes
> kernel memory, which includes a pure read and strcpy, both in strict
> and not strict variants.  Just provide a single arch hooks instead to
> make sure all architectures cover all the cases.

Fix a buildo.

--- a/arch/x86/mm/maccess.c~maccess-unify-the-probe-kernel-arch-hooks-fix
+++ a/arch/x86/mm/maccess.c
@@ -29,6 +29,6 @@ bool probe_kernel_read_allowed(const voi
 {
 	if (!strict)
 		return true;
-	return (unsigned long)vaddr >= TASK_SIZE_MAX;
+	return (unsigned long)unsafe_src >= TASK_SIZE_MAX;
 }
 #endif
_