linux-kernel - Re: [PATCH] Use task_pid_nr() instead of pid_nr(task

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]

Date:	Mon, 08 Oct 2007 12:57:54 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, devel@...nvz.org, hpa@...or.com,
	menage@...gle.com
Subject: Re: [PATCH] Use task_pid_nr() instead of pid_nr(task_pid())

Andrew Morton wrote:
> On Wed, 03 Oct 2007 18:26:06 +0400
> Pavel Emelyanov <xemul@...nvz.org> wrote:
> 
>> There are two places that do so - the cgroups subsystem 
>> and the autofs code.
>>
>> Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
>>
>> ---
>>
>> diff --git a/fs/autofs/root.c b/fs/autofs/root.c
>> index 592f640..5efff3c 100644
>> --- a/fs/autofs/root.c
>> +++ b/fs/autofs/root.c
>> @@ -214,7 +214,7 @@ static struct dentry *autofs_root_lookup
>>  
>>  	oz_mode = autofs_oz_mode(sbi);
>>  	DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
>> -				"oz_mode = %d\n", pid_nr(task_pid(current)),
>> +				"oz_mode = %d\n", task_pid_nr(current),
>>  				task_pgrp_nr(current), sbi->catatonic,
>>  				oz_mode));
>>  
>> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
>> index 1e8aa53..8720881 100644
>> --- a/kernel/cgroup.c
>> +++ b/kernel/cgroup.c
>> @@ -1762,7 +1762,7 @@ static int pid_array_load(pid_t *pidarra
>>  	while ((tsk = cgroup_iter_next(cont, &it))) {
>>  		if (unlikely(n == npids))
>>  			break;
>> -		pidarray[n++] = pid_nr(task_pid(tsk));
>> +		pidarray[n++] = task_pid_nr(tsk);
>>  	}
>>  	cgroup_iter_end(cont, &it);
>>  	return n;
> 
> And more will appear over time unless we remove pid_nr() altogether.
> 
> Can we do that?

Hardly. 

There are places that store the struct pid and try to obtain its number
later. E.g. tiocgpgrp() wants to tell user the pgrp nr of the tty's 
active group; fgetown() tells user the number of file's owner pid or (!)
pgrp; file locks need to store the pid and report it later (this is not 
implemented yet, I'm still working on it) and so on and so forth.

Thanks,
Pavel
-
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/