linux-kernel - Re: Tomoyo compile failure on alpha: sys

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Message-Id: <201009241923.GFE89377.tQFMFFOJSHOOVL@I-love.SAKURA.ne.jp>
Date:	Fri, 24 Sep 2010 19:23:13 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	hch@...radead.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Tomoyo compile failure on alpha: sys_get[p]pid undefined

Christoph Hellwig wrote:
> On Fri, Sep 24, 2010 at 09:10:37AM +0300, Meelis Roos wrote:
> > 2.6.36-rc5+git as of yesterday:
> > 
> >   LD      .tmp_vmlinux1
> > security/built-in.o: In function `tomoyo_supervisor':(.text+0xea98): undefined reference to `sys_getpid'
> > security/built-in.o: In function `tomoyo_supervisor':(.text+0xeab0): undefined reference to `sys_getpid'
> > security/built-in.o: In function `tomoyo_supervisor':(.text+0xeac0): undefined reference to `sys_getppid'
> > security/built-in.o: In function `tomoyo_supervisor':(.text+0xeac4): undefined reference to `sys_getppid'
> > 
> > Seems alpha has different mechanisms for using these syscalls from 
> > inside the kernel?
> 
> The real problem is that kernel code should never call system calls.
> The correct fix is to get rid of this abuse.
> 
AUDITSYSCALL (kernel/auditsc.c) is using sys_getppid().
What is your plan for getting rid of below abuse?

static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
        const struct cred *cred;
        int i, call_panic = 0;
        struct audit_buffer *ab;
        struct audit_aux_data *aux;
        const char *tty;

        /* tsk == current */
        context->pid = tsk->pid;
        if (!context->ppid)
                context->ppid = sys_getppid();
        cred = current_cred();
...(snipped)...
}
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