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:	Mon, 26 May 2008 23:12:09 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	"Luming Yu" <luming.yu@...il.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

>  [<a00000010000a9f0>] skip_rbs_switch+0xe0/0x110
>                                 sp=e000000141c9fe30 bsp=e000000141c90cf8
>  [<a000000000010740>] __kernel_syscall_via_break+0x0/0x20
>                                 sp=e000000141ca0000 bsp=e000000141c90cf8
>  [<a0000001000971c0>] ptrace_stop+0xa0/0x3e0
>                                 sp=e00000014716fdb0 bsp=e000000147160ca8
>  [<a000000100097650>] ptrace_notify+0x150/0x1c0
>                                 sp=e00000014716fdb0 bsp=e000000147160c88

If this is a backtrace of a single thread on the same kernel stack, it has
a stack depth of over 84MB.  You still need to follow the path inside
ia64_ptrace_stop() to see how any of this is possible.


Thanks,
Roland
--
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/