linux-kernel - Re: [PATCH?] uprobes: change uprobe_write

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Message-ID: <20131203200147.GB19083@redhat.com>
Date:	Tue, 3 Dec 2013 21:01:47 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH?] uprobes: change uprobe_write_opcode() to modify the
	page directly

On 12/03, H. Peter Anvin wrote:
>
> I guess it would have to be checked, but I would be *highly* surprised
> if UPROBE_SWBP_INSN_SIZE ever[1] could be anything than the fundamental
> instruction quantum, which means it should never be able to wrap a page,

Yes, it can't.

> but *also* should mean it should be able to just be put_user()'d

put_user() obviously can't work, we need access_remote_vm-like code.

> followed by whatever synchronization necessary to make it globally visible.

Could you explain what this synchronization should actually do ?

Oleg.

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