From: Borislav Petkov <bp@alien8.de>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>, Hugh Dickins <hughd@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Kosina <jkosina@suse.cz>, Andi Kleen <andi@firstfloor.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Andi Kleen <ak@linux.intel.com>, Ingo Molnar <mingo@kernel.org>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Subject: Re: [PATCH?] uprobes: change uprobe_write_opcode() to modify the page directly
Date: Thu, 5 Dec 2013 18:49:23 +0100 [thread overview]
Message-ID: <20131205174923.GE14407@pd.tnic> (raw)
In-Reply-To: <20131205172355.GA25780@redhat.com>
On Thu, Dec 05, 2013 at 06:23:55PM +0100, Oleg Nesterov wrote:
> This is almost off-topic, but I am wondering if (in the long term) we
> can avoid this "insert the bp into every mm" altogether.
>
> Instead, uprobe_write_opcode() should only unmap this page and set
Ok, sorry if I'm completely off base here but have you guys tried
unmapping the page from all other VMs, patching it and causing all
the VMs to refault it thereby getting the updated content? During the
patching you'd probably need to cause the #PF handler to "loop" until
patching is complete though.
I don't know whether that is even doable/makes sense - just a dumb
idea...
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
next prev parent reply other threads:[~2013-12-05 17:49 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-26 0:37 [PATCH] Add a text_poke syscall v2 Andi Kleen
2013-11-26 19:05 ` Andy Lutomirski
2013-11-26 19:11 ` Andi Kleen
2013-11-26 20:03 ` Linus Torvalds
2013-11-27 19:57 ` H. Peter Anvin
2013-11-27 22:02 ` H. Peter Anvin
2013-11-27 22:21 ` Andy Lutomirski
2013-11-27 22:21 ` Borislav Petkov
2013-11-27 22:24 ` H. Peter Anvin
2013-11-27 22:25 ` H. Peter Anvin
2013-11-27 22:29 ` Borislav Petkov
2013-11-27 22:31 ` H. Peter Anvin
2013-11-27 23:04 ` Linus Torvalds
2013-11-27 23:13 ` Borislav Petkov
2013-11-27 22:40 ` H. Peter Anvin
2013-11-27 23:10 ` Borislav Petkov
2013-11-27 23:20 ` H. Peter Anvin
2013-11-27 23:40 ` Borislav Petkov
2013-11-27 23:47 ` H. Peter Anvin
2013-11-27 22:41 ` Linus Torvalds
2013-11-27 22:53 ` H. Peter Anvin
2013-11-27 23:15 ` Linus Torvalds
2013-11-27 23:28 ` H. Peter Anvin
2013-11-28 2:01 ` Linus Torvalds
2013-11-28 2:10 ` H. Peter Anvin
2013-11-28 9:12 ` Jiri Kosina
2013-11-27 23:44 ` Andi Kleen
2013-11-29 18:35 ` Oleg Nesterov
2013-11-29 19:54 ` Andi Kleen
2013-11-29 20:05 ` Oleg Nesterov
2013-11-29 20:17 ` H. Peter Anvin
2013-11-29 20:35 ` Oleg Nesterov
2013-11-29 21:24 ` H. Peter Anvin
2013-11-30 14:56 ` Oleg Nesterov
2013-11-29 23:24 ` Jiri Kosina
2013-11-30 0:22 ` Linus Torvalds
2013-12-03 18:49 ` [PATCH?] uprobes: change uprobe_write_opcode() to modify the page directly Oleg Nesterov
2013-12-03 19:00 ` Linus Torvalds
2013-12-03 19:20 ` H. Peter Anvin
2013-12-03 20:01 ` Oleg Nesterov
2013-12-03 20:21 ` H. Peter Anvin
2013-12-03 20:38 ` Oleg Nesterov
2013-12-03 20:43 ` H. Peter Anvin
2013-12-03 20:54 ` Oleg Nesterov
2013-12-03 22:01 ` Linus Torvalds
2013-12-03 23:47 ` H. Peter Anvin
2013-12-04 11:30 ` Oleg Nesterov
2013-12-04 11:11 ` Oleg Nesterov
2013-12-04 16:01 ` H. Peter Anvin
2013-12-04 16:48 ` Oleg Nesterov
2013-12-04 16:54 ` H. Peter Anvin
2013-12-04 17:15 ` Linus Torvalds
2013-12-04 17:43 ` Oleg Nesterov
2013-12-05 17:23 ` Oleg Nesterov
2013-12-05 17:49 ` Borislav Petkov [this message]
2013-12-05 18:45 ` Oleg Nesterov
2013-12-04 18:32 ` H. Peter Anvin
2013-12-05 8:28 ` Jon Medhurst (Tixy)
2013-12-03 22:42 ` H. Peter Anvin
2013-12-03 19:53 ` Oleg Nesterov
2013-11-30 15:20 ` [PATCH] Add a text_poke syscall v2 Oleg Nesterov
2013-11-30 16:51 ` Oleg Nesterov
2013-11-30 17:31 ` Oleg Nesterov
2013-11-30 5:16 ` H. Peter Anvin
2013-11-30 14:52 ` Oleg Nesterov
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