The patch titled
sysctl: make CONFIG_SYSCTL_SYSCALL default to n
has been added to the -mm tree. Its filename is
sysctl-make-config_sysctl_syscall-default-to-n.patch
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------------------------------------------------------
Subject: sysctl: make CONFIG_SYSCTL_SYSCALL default to n
From: WANG Cong <amwang@xxxxxxxxxx>
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: WANG Cong <amwang@xxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/feature-removal-schedule.txt | 35 -------------------
init/Kconfig | 4 +-
2 files changed, 2 insertions(+), 37 deletions(-)
diff -puN Documentation/feature-removal-schedule.txt~sysctl-make-config_sysctl_syscall-default-to-n Documentation/feature-removal-schedule.txt
--- a/Documentation/feature-removal-schedule.txt~sysctl-make-config_sysctl_syscall-default-to-n
+++ a/Documentation/feature-removal-schedule.txt
@@ -133,41 +133,6 @@ Who: Pavel Machek <pavel@xxxxxx>
---------------------------
-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@xxxxxxxxxxxx>
-
----------------------------
-
What: /proc/<pid>/oom_adj
When: August 2012
Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's
diff -puN init/Kconfig~sysctl-make-config_sysctl_syscall-default-to-n init/Kconfig
--- a/init/Kconfig~sysctl-make-config_sysctl_syscall-default-to-n
+++ a/init/Kconfig
@@ -935,7 +935,7 @@ 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
@@ -947,7 +947,7 @@ 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
_
Patches currently in -mm which might be from amwang@xxxxxxxxxx are
linux-next.patch
sched-fix-a-memory-leak-in-__sdt_free.patch
sysctl-make-config_sysctl_syscall-default-to-n.patch
nbd-use-task_pid_nr-to-get-current-pid.patch
nbd-replace-sysfs_create_file-with-device_create_file.patch
nbd-replace-printk-kern_err-with-dev_err.patch
nbd-lower-the-loglevel-of-an-error-message.patch
nbd-replace-some-printk-with-dev_warn-and-dev_info.patch
nbd-replace-some-printk-with-dev_warn-and-dev_info-checkpatch-fixes.patch
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