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Commit c736de60 authored by WANG Cong's avatar WANG Cong Committed by Linus Torvalds
Browse files

sysctl: make CONFIG_SYSCTL_SYSCALL default to n 



When I tried to send a patch to remove it, Andi told me we still need to
keep compabitlies for old libc, so we can't remove this completely.  Then
just make it default to n and remove the doc from
feature-removal-schedule.txt.

Signed-off-by: default avatarWANG Cong <amwang@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f1ecf068

Documentation/feature-removal-schedule.txt

+0 −35
Original line number Diff line number Diff line
@@ -133,41 +133,6 @@ Who: Pavel Machek <pavel@ucw.cz> 


---------------------------



What:	sys_sysctl

When:	September 2010

Option: CONFIG_SYSCTL_SYSCALL

Why:	The same information is available in a more convenient from

	/proc/sys, and none of the sysctl variables appear to be

	important performance wise.



	Binary sysctls are a long standing source of subtle kernel

	bugs and security issues.



	When I looked several months ago all I could find after

	searching several distributions were 5 user space programs and

	glibc (which falls back to /proc/sys) using this syscall.



	The man page for sysctl(2) documents it as unusable for user

	space programs.



	sysctl(2) is not generally ABI compatible to a 32bit user

	space application on a 64bit and a 32bit kernel.



	For the last several months the policy has been no new binary

	sysctls and no one has put forward an argument to use them.



	Binary sysctls issues seem to keep happening appearing so

	properly deprecating them (with a warning to user space) and a

	2 year grace warning period will mean eventually we can kill

	them and end the pain.



	In the mean time individual binary sysctls can be dealt with

	in a piecewise fashion.



Who:	Eric Biederman <ebiederm@xmission.com>



---------------------------



What:	/proc/<pid>/oom_adj

When:	August 2012

Why:	/proc/<pid>/oom_adj allows userspace to influence the oom killer's

init/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -947,7 +947,7 @@ config UID16 
config SYSCTL_SYSCALL

	bool "Sysctl syscall support" if EXPERT

	depends on PROC_SYSCTL

	default y

	default n

	select SYSCTL

	---help---

	  sys_sysctl uses binary paths that have been found challenging
@@ -959,7 +959,7 @@ config SYSCTL_SYSCALL 
	  trying to save some space it is probably safe to disable this,

	  making your kernel marginally smaller.



	  If unsure say Y here.

	  If unsure say N here.



config KALLSYMS

	 bool "Load all symbols for debugging/ksymoops" if EXPERT