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>
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
#ifndef _ASM_SOCKET_H
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#define _ASM_SOCKET_H
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#include <asm/sockios.h>
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/* For setsockopt(2) */
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#define SOL_SOCKET 0xffff
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#define SO_DEBUG 0x0001
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#define SO_PASSCRED 0x0002
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#define SO_REUSEADDR 0x0004
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#define SO_KEEPALIVE 0x0008
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#define SO_DONTROUTE 0x0010
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#define SO_BROADCAST 0x0020
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#define SO_PEERCRED 0x0040
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#define SO_LINGER 0x0080
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#define SO_OOBINLINE 0x0100
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/* To add :#define SO_REUSEPORT 0x0200 */
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#define SO_BSDCOMPAT 0x0400
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#define SO_RCVLOWAT 0x0800
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#define SO_SNDLOWAT 0x1000
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#define SO_RCVTIMEO 0x2000
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#define SO_SNDTIMEO 0x4000
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#define SO_ACCEPTCONN 0x8000
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#define SO_SNDBUF 0x1001
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#define SO_RCVBUF 0x1002
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#define SO_SNDBUFFORCE 0x100a
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#define SO_RCVBUFFORCE 0x100b
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#define SO_ERROR 0x1007
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#define SO_TYPE 0x1008
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#define SO_PROTOCOL 0x1028
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#define SO_DOMAIN 0x1029
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/* Linux specific, keep the same. */
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#define SO_NO_CHECK 0x000b
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#define SO_PRIORITY 0x000c
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#define SO_BINDTODEVICE 0x000d
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#define SO_ATTACH_FILTER 0x001a
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#define SO_DETACH_FILTER 0x001b
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#define SO_GET_FILTER SO_ATTACH_FILTER
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#define SO_PEERNAME 0x001c
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#define SO_TIMESTAMP 0x001d
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#define SCM_TIMESTAMP SO_TIMESTAMP
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#define SO_PEERSEC 0x001e
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#define SO_PASSSEC 0x001f
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#define SO_TIMESTAMPNS 0x0021
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#define SCM_TIMESTAMPNS SO_TIMESTAMPNS
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#define SO_MARK 0x0022
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#define SO_TIMESTAMPING 0x0023
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#define SCM_TIMESTAMPING SO_TIMESTAMPING
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#define SO_RXQ_OVFL 0x0024
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#define SO_WIFI_STATUS 0x0025
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#define SCM_WIFI_STATUS SO_WIFI_STATUS
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#define SO_PEEK_OFF 0x0026
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/* Instruct lower device to use last 4-bytes of skb data as FCS */
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#define SO_NOFCS 0x0027
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#define SO_LOCK_FILTER 0x0028
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/* Security levels - as per NRL IPv6 - don't actually do anything */
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#define SO_SECURITY_AUTHENTICATION 0x5001
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#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002
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#define SO_SECURITY_ENCRYPTION_NETWORK 0x5004
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#endif /* _ASM_SOCKET_H */
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