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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 03 Dec 2013 12:43:05 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Oleg Nesterov <oleg@...hat.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

There is no architecture-independent way to make code globally visible.

Oleg Nesterov <oleg@...hat.com> wrote:
>On 12/03, H. Peter Anvin wrote:
>>
>> On 12/03/2013 12:01 PM, Oleg Nesterov wrote:
>> >
>> >> followed by whatever synchronization necessary to make it globally
>visible.
>> >
>> > Could you explain what this synchronization should actually do ?
>> >
>>
>> That is architecture-dependent. On x86 it requires each CPU on which
>> this code is visible to be IPId, on others it involves complex icache
>> flushing protocols.
>
>Hmm. And why this would be better than arch-independent code I sent?
>
>IOW. Could you please comment the patch I sent?
>
>Oleg.

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/