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] [day] [month] [year] [list]
Message-Id: <201105080037.GFD90166.HFMQVLOSFOtFJO@I-love.SAKURA.ne.jp>
Date:	Sun, 8 May 2011 00:37:34 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	akpm@...ux-foundation.org
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	john.stultz@...aro.org
Subject: Re: [PATCH 1/1] coredump: use task comm instead of (unknown)

Andrew Morton wrote:
> PR_SET_NAME uses set_task_comm() which has appropriate locking to
> protect against get_task_comm().  
> 
> If kernel code directly accesses task->comm without taking task_lock()
> then yes, it's racy.

I see. Well,

  grep -r -- '->comm[,;)]' .

in 2.6.39-rc6 shows so many users directly reading/updating, including

	case 'e':
		err = cn_printf(cn, "%s", current->comm);
		break;

in format_corename().

> Hopefully John Stultz will soon be presenting us with a %p modifier for
> displaying task_struct.comm.

That will be nice. But caller might by error call printk() with that modifier
between task_lock() and task_unlock().
--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ