Vincent Bernat d59577b6ff sk-filter: Add ability to lock a socket filter program ... While a privileged program can open a raw socket, attach some restrictive filter and drop its privileges (or send the socket to an unprivileged program through some Unix socket), the filter can still be removed or modified by the unprivileged program. This commit adds a socket option to lock the filter (SO_LOCK_FILTER) preventing any modification of a socket filter program. This is similar to OpenBSD BIOCLOCK ioctl on bpf sockets, except even root is not allowed change/drop the filter. The state of the lock can be read with getsockopt(). No error is triggered if the state is not changed. -EPERM is returned when a user tries to remove the lock or to change/remove the filter while the lock is active. The check is done directly in sk_attach_filter() and sk_detach_filter() and does not affect only setsockopt() syscall. Signed-off-by: Vincent Bernat <bernat@luffy.cx> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-01-17 03:21:25 -05:00
..
boot	Disintegrate asm/system.h for Alpha	2012-03-28 18:11:12 +01:00
include	sk-filter: Add ability to lock a socket filter program	2013-01-17 03:21:25 -05:00
kernel	ALPHA: drivers: remove __dev* attributes.	2013-01-03 15:57:13 -08:00
lib	alpha: Use new generic strncpy_from_user() and strnlen_user()	2012-08-19 08:41:18 -07:00
math-emu	alpha: change to new Makefile flag variables	2011-01-17 05:42:13 +01:00
mm	alpha/mm/fault.c: Port OOM changes to do_page_fault	2012-08-19 08:41:19 -07:00
oprofile	alpha: Fix fall-out from disintegrating asm/system.h	2012-08-19 08:41:19 -07:00
defconfig	defconfig reduction	2010-08-14 22:26:53 +02:00
Kconfig	alpha: switch to generic sigaltstack	2012-12-19 18:07:42 -05:00
Kconfig.debug	alpha/parisc: remove config variable DEBUG_RWLOCK	2008-02-06 10:41:03 -08:00
Makefile	alpha: link failure fix	2008-06-20 16:46:10 -07:00