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From: Petr Tesarik <ptesarik@suse.cz>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] ptrace RSE bug
Date: Wed, 17 Oct 2007 19:55:45 +0000	[thread overview]
Message-ID: <471668C1.7000706@suse.cz> (raw)
In-Reply-To: <1188357710.22637.7.camel@sli10-conroe.sh.intel.com>

Petr Tesarik wrote:
>[...]
>   2. You must couple it with the (planned) changes to ptrace,
> because otherwise PTRACE_{PEEK,POKE}{TEXT,DATA} still access the kernel
> RBS, but it gets later overwritten back from userspace when it is synced.

I have verified that failing to do so breaks "strace -f", because strace
relies on intercepting the clone() system call and setting the
CLONE_PTRACE bit in the flags argument. Of course, if the bit is only
set in the kernel RBS, which is overwritten with the (old) value from
the user RBS on a PTRACE_CONT, the new process is not traced.

Regards,
Petr Tesarik

  parent reply	other threads:[~2007-10-17 19:55 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-29  3:21 [PATCH] ptrace RSE bug Shaohua Li
2007-08-29  7:10 ` Roland McGrath
2007-08-29  7:29 ` Matthew Chapman
2007-08-29  8:01 ` Roland McGrath
2007-09-05 16:25 ` Petr Tesarik
2007-09-06  3:16 ` Shaohua Li
2007-09-06 13:59 ` Petr Tesarik
2007-09-07  1:02 ` Shaohua Li
2007-09-07  8:26 ` Petr Tesarik
2007-09-07 15:11 ` David Mosberger-Tang
2007-09-11  8:39 ` Shaohua Li
2007-10-17 14:56 ` Petr Tesarik
2007-10-17 19:48 ` Petr Tesarik
2007-10-17 19:55 ` Petr Tesarik [this message]
2007-10-18  1:54 ` Shaohua Li
2007-10-18 10:59 ` Petr Tesarik
2007-10-18 16:02 ` Christoph Hellwig
2007-10-19  7:30 ` Shaohua Li
2007-10-19 19:42 ` Petr Tesarik
2007-10-24  3:34 ` Shaohua Li
2007-10-24 23:38 ` Luck, Tony
2007-10-25  0:38 ` Shaohua Li
2007-11-12  2:14 ` Roland McGrath
2007-11-12 15:41 ` Petr Tesarik
2007-11-12 16:11 ` Petr Tesarik
2007-11-13  0:30 ` Roland McGrath
2007-11-13 11:07 ` Petr Tesarik
2007-11-14  5:38 ` Shaohua Li
2007-11-14  6:47 ` Roland McGrath
2007-11-14  7:37 ` Petr Tesarik
2007-11-14  7:40 ` Roland McGrath
2007-11-14  7:53 ` Petr Tesarik
2007-11-14  7:55 ` Petr Tesarik
2007-11-14 11:09 ` Roland McGrath
2007-11-16 20:05 ` Petr Tesarik
2007-11-18  3:08 ` Roland McGrath

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