linux/arch/m32r
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 m32r: make memset() global for CONFIG_KERNEL_BZIP2=y 2012-07-17 16:21:30 -07:00
configs kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
include sk-filter: Add ability to lock a socket filter program 2013-01-17 03:21:25 -05:00
kernel ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
lib m32r: export delay loop symbols 2009-10-04 12:02:36 +09:00
mm Disintegrate asm/system.h for M32R 2012-03-28 18:30:02 +01:00
oprofile oprofile: more whitespace fixes 2008-10-15 20:55:51 +02:00
platforms Disintegrate asm/system.h for M32R 2012-03-28 18:30:02 +01:00
Kconfig Bury the conditionals from kernel_thread/kernel_execve series 2012-12-19 18:07:38 -05:00
Kconfig.debug lib: consolidate DEBUG_STACK_USAGE option 2011-05-25 08:39:54 -07:00
Makefile m32r: Use generic init_task 2012-05-05 13:00:23 +02:00