linux-kernel - Re: [PATCH 1/2] arm64: Blacklist non-kprobe-able symbols

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]

Message-ID: <20150706090323.GB30342@arm.com>
Date:	Mon, 6 Jul 2015 10:03:24 +0100
From:	Will Deacon <will.deacon@....com>
To:	Pratyush Anand <panand@...hat.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"wcohen@...hat.com" <wcohen@...hat.com>,
	"dave.long@...aro.org" <dave.long@...aro.org>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH 1/2] arm64: Blacklist non-kprobe-able symbols

On Mon, Jul 06, 2015 at 06:03:21AM +0100, Pratyush Anand wrote:
> Add all function symbols which are called from do_debug_exception under
> NOKPROBE_SYMBOL, as they can not kprobed.

It's a shame this has to be so manual, but I suppose it's done on a
best-effort basis to catch broken probe placement.

If we miss a function and somebody probes it, do we just get stuck in a
recursive exception, or could we print something suggesting that a symbol
be annotated as NOKPROBE?

Will
--
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/