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Date: Mon, 01 Dec 2008 15:10:57 -0500 From: Stephen Smalley <sds@...ho.nsa.gov> To: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, Kentaro Takeda <takedakn@...data.co.jp>, Toshiharu Harada <haradats@...data.co.jp>, David Howells <dhowells@...hat.com>, James Morris <jmorris@...ei.org> Subject: Re: [TOMOYO #13 (mmotm 2008-11-19-02-19) 09/11] LSM adapter functions. On Thu, 2008-11-20 at 20:25 +0900, Tetsuo Handa wrote: > plain text document attachment (tomoyo-hooks.patch) > This is LSM adapter for TOMOYO. > This version of TOMOYO assigns only one variable "struct tomoyo_domain_info *" > to "current->cred->security". > > Future version will require two variables "struct tomoyo_domain_info *" and > "u32". > http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/include/linux/sched.h#L1311 > Well, how to implement this while "current->cred->security" cannot be modified > freely? > > To be honest, the only object which TOMOYO needs to assign variables is > "struct task_struct". TOMOYO's "T" means "task". > TOMOYO utilizes characteristics of "struct task_struct". > For TOMOYO, use of per task variables is vital. > > Removal of security_task_alloc() and security_task_free() by introduction of > COW credentials will become a nightmare when TOMOYO tries to add "u32". > Of cource, if TOMOYO is allowed to add "u32" to "struct task_struct", > COW credentials won't become a nightmare. Can you explain exactly how you are using this per-task state and why it is a problem to create a new cred in the situations where you need to modify it? I think that this issue needs to be addressed up front. -- Stephen Smalley National Security Agency -- 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/
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