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
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arch-v10	flagday: don't pass regs to copy_thread()	2012-11-28 23:43:42 -05:00
arch-v32	ARCH: drivers remove __dev* attributes.	2013-01-03 15:57:13 -08:00
boot	Fix common misspellings	2011-03-31 11:26:23 -03:00
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	CRIS: use kbuild.h instead of defining macros in asm-offset.c	2012-12-20 12:45:40 +01:00
mm	readahead: fault retry breaks mmap file read random detection	2012-10-09 16:22:47 +09:00
Kconfig	Bury the conditionals from kernel_thread/kernel_execve series	2012-12-19 18:07:38 -05:00
Kconfig.debug	Kconfig: remove a few puzzling comments	2011-10-31 10:58:48 +01:00
Makefile	UAPI: Partition the header include path sets and add uapi/ header directories	2012-10-02 18:01:26 +01:00