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Date: Wed, 27 May 2020 17:55:47 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Christoph Hellwig <hch@....de> Cc: x86@...nel.org, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Masami Hiramatsu <mhiramat@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-parisc@...r.kernel.org, linux-um@...ts.infradead.org, netdev@...r.kernel.org, bpf@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 10/23] maccess: unify the probe kernel arch hooks On Thu, 21 May 2020 17:22:48 +0200 Christoph Hellwig <hch@....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 _
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