linux-kernel - Re: 2.6.23-rc2-mm2

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Date:	Fri, 10 Aug 2007 11:12:55 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Alexey Dobriyan <adobriyan@...ru>
Subject: Re: 2.6.23-rc2-mm2

Ingo Molnar <mingo@...e.hu> writes:

> * Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
>> Yes.  For the sched debug case I sent Ingo and friends but apparently 
>> other changes in Ingos tree kept it from applying and Andrew dropped 
>> it.  So instead the code now screams at you and refuses to register 
>> Ingo sysctl table.
>
> the commit below is now upstream - is your patch still needed?

Ok.  I missed that.  Duh.  I just saw Andrews drop message.

This looks like Alexey respun my patch, or else we were thinking on
parallel paths.  Probably parallel given Alexey's dislike of 
using the CTL_UNNUMBERED define.

There are two remaining gotchas:
- The directories have impossible permissions (writeable).

- The ctl_name for the kernel directory is inconsistent with
  everything else.  It should be CTL_KERN.

I think the patch below fixes that up but I haven't had a chance to
test it yet.

I kind of feel bad about being so picky but the this code is the
only place in the kernel where I have seen us violate either
of those rules, and it is a lot easier to deal with things
when they are consistent.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

diff --git a/kernel/sched.c b/kernel/sched.c
index b0afd8d..47afd80 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5223,15 +5223,16 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
 static struct ctl_table sd_ctl_dir[] = {
 	{
 		.procname	= "sched_domain",
-		.mode		= 0755,
+		.mode		= 0555,
 	},
 	{0,},
 };
 
 static struct ctl_table sd_ctl_root[] = {
 	{
+		.ctl_name	= CTL_KERN,
 		.procname	= "kernel",
-		.mode		= 0755,
+		.mode		= 0555,
 		.child		= sd_ctl_dir,
 	},
 	{0,},
@@ -5307,7 +5308,7 @@ static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
 	for_each_domain(cpu, sd) {
 		snprintf(buf, 32, "domain%d", i);
 		entry->procname = kstrdup(buf, GFP_KERNEL);
-		entry->mode = 0755;
+		entry->mode = 0555;
 		entry->child = sd_alloc_ctl_domain_table(sd);
 		entry++;
 		i++;
@@ -5327,7 +5328,7 @@ static void init_sched_domain_sysctl(void)
 	for (i = 0; i < cpu_num; i++, entry++) {
 		snprintf(buf, 32, "cpu%d", i);
 		entry->procname = kstrdup(buf, GFP_KERNEL);
-		entry->mode = 0755;
+		entry->mode = 0555;
 		entry->child = sd_alloc_ctl_cpu_table(i);
 	}
 	sd_sysctl_header = register_sysctl_table(sd_ctl_root);
-
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