linux-kernel - Re: [RFC PATCH] set TASK_TRACED before arch

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:	Wed, 28 May 2008 17:14:28 +0800
From:	"Luming Yu" <luming.yu@...il.com>
To:	"Roland McGrath" <roland@...hat.com>
Cc:	"Petr Tesarik" <ptesarik@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-ia64@...r.kernel.org
Subject: Re: [RFC PATCH] set TASK_TRACED before arch_ptrace code to fix a race

Some correction about the test case hang,  the ps output should looks
like the following:
13925 S+ strace -f ./test1
13926 S+ ./test1
13927 T+  /bin/bash ./test2

I'm trying upstream kdump to get more detailed data for help analysis
the scenario..
But unfortunately upstream kernel just hang when I echo c to
sysrq-trigger.  Downgrade the kernel to 2.6.22,  'echo c' doesn't
hang, but I just got "zero" dump file...
Will try F9 later... But from the symptom shouldn't we ask this
question: why  process 13927 can't wake up?  Roland,  please confirm
if ptrace_untrace is the only way to get Traced process wake up?  Back
up to caller of ptrace_untrace, maybe we can find out why my RFC patch
happen to fix the problem... Any suggestions are welcome!
--Luming
--
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/