freebsd-skq/sys
pjd 029a6f5d92 Change the cap_rights_t type from uint64_t to a structure that we can extend
in the future in a backward compatible (API and ABI) way.

The cap_rights_t represents capability rights. We used to use one bit to
represent one right, but we are running out of spare bits. Currently the new
structure provides place for 114 rights (so 50 more than the previous
cap_rights_t), but it is possible to grow the structure to hold at least 285
rights, although we can make it even larger if 285 rights won't be enough.

The structure definition looks like this:

	struct cap_rights {
		uint64_t	cr_rights[CAP_RIGHTS_VERSION + 2];
	};

The initial CAP_RIGHTS_VERSION is 0.

The top two bits in the first element of the cr_rights[] array contain total
number of elements in the array - 2. This means if those two bits are equal to
0, we have 2 array elements.

The top two bits in all remaining array elements should be 0.
The next five bits in all array elements contain array index. Only one bit is
used and bit position in this five-bits range defines array index. This means
there can be at most five array elements in the future.

To define new right the CAPRIGHT() macro must be used. The macro takes two
arguments - an array index and a bit to set, eg.

	#define	CAP_PDKILL	CAPRIGHT(1, 0x0000000000000800ULL)

We still support aliases that combine few rights, but the rights have to belong
to the same array element, eg:

	#define	CAP_LOOKUP	CAPRIGHT(0, 0x0000000000000400ULL)
	#define	CAP_FCHMOD	CAPRIGHT(0, 0x0000000000002000ULL)

	#define	CAP_FCHMODAT	(CAP_FCHMOD | CAP_LOOKUP)

There is new API to manage the new cap_rights_t structure:

	cap_rights_t *cap_rights_init(cap_rights_t *rights, ...);
	void cap_rights_set(cap_rights_t *rights, ...);
	void cap_rights_clear(cap_rights_t *rights, ...);
	bool cap_rights_is_set(const cap_rights_t *rights, ...);

	bool cap_rights_is_valid(const cap_rights_t *rights);
	void cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
	void cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
	bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);

Capability rights to the cap_rights_init(), cap_rights_set(),
cap_rights_clear() and cap_rights_is_set() functions are provided by
separating them with commas, eg:

	cap_rights_t rights;

	cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FSTAT);

There is no need to terminate the list of rights, as those functions are
actually macros that take care of the termination, eg:

	#define	cap_rights_set(rights, ...)				\
		__cap_rights_set((rights), __VA_ARGS__, 0ULL)
	void __cap_rights_set(cap_rights_t *rights, ...);

Thanks to using one bit as an array index we can assert in those functions that
there are no two rights belonging to different array elements provided
together. For example this is illegal and will be detected, because CAP_LOOKUP
belongs to element 0 and CAP_PDKILL to element 1:

	cap_rights_init(&rights, CAP_LOOKUP | CAP_PDKILL);

Providing several rights that belongs to the same array's element this way is
correct, but is not advised. It should only be used for aliases definition.

This commit also breaks compatibility with some existing Capsicum system calls,
but I see no other way to do that. This should be fine as Capsicum is still
experimental and this change is not going to 9.x.

Sponsored by:	The FreeBSD Foundation
2013-09-05 00:09:56 +00:00
..
amd64 Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
arm Revert accidental commit. 2013-09-02 17:07:46 +00:00
boot Initial support for the Digi ConnectCore(c) i.MX53 / Wi-i.MX53 boards. 2013-09-01 20:15:35 +00:00
bsm Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
cam Add debug trace points for freeze/release device queue. 2013-09-01 17:37:19 +00:00
cddl Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
compat Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
conf Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
contrib Add firmware for Centrino 2200-N wireless devices. 2013-08-28 15:12:51 +00:00
crypto Use the fact that the AES-NI instructions can be pipelined to improve 2013-09-03 18:31:23 +00:00
ddb
dev Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
fs Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
gdb rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LAST 2013-07-24 09:45:31 +00:00
geom Make ELI destruction (including orphanization) less aggressive, making it 2013-09-02 10:44:54 +00:00
gnu/fs/reiserfs Garbage collect XFS bits which are now already completely disconnected 2013-03-02 15:33:54 +00:00
i386 Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
ia64 Significantly reduce the cost, i.e., run time, of calls to madvise(..., 2013-08-29 15:49:05 +00:00
isa
kern Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
kgssapi Add support for host-based (Kerberos 5 service principal) initiator 2013-07-09 01:05:28 +00:00
libkern Fix watchdog pretimeout. 2013-07-27 20:47:01 +00:00
mips Add 32-bit support for Gxemul's oldtestmips machine emulation 2013-09-04 20:34:36 +00:00
modules Use the fact that the AES-NI instructions can be pipelined to improve 2013-09-03 18:31:23 +00:00
net Convert the if_lagg rwlock to an rmlock. 2013-08-29 19:35:14 +00:00
net80211 Create a new function to complete 802.11 mbuf transmission. 2013-08-27 14:37:13 +00:00
netatalk Add const qualifier to the dst parameter of the ifnet if_output method. 2013-04-26 12:50:32 +00:00
netgraph Make default cache size more modern. 2013-09-04 10:17:50 +00:00
netinet Remove redundant field pr_sctp_on. 2013-09-03 19:31:59 +00:00
netinet6 Remove most of the remaining sysctl name list macros. They were only 2013-08-26 18:16:05 +00:00
netipsec Remove most of the remaining sysctl name list macros. They were only 2013-08-26 18:16:05 +00:00
netipx
netnatm
netpfil Merge 1.12 of pf_lb.c from OpenBSD, with some changes. Original commit: 2013-09-02 10:14:25 +00:00
netsmb Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
nfs Changes to allow using BOOTP_NFSROOT and mounting an nfs root filesystem 2013-07-31 19:14:00 +00:00
nfsclient A problem with the old NFS client where large writes to large files 2013-07-04 00:54:23 +00:00
nfsserver Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
nlm
ofed Change m->pkthdr.header to m->pkthdr.PH_loc.ptr after r254804 2013-08-25 09:45:26 +00:00
opencrypto Make sendfile() a method in the struct fileops. Currently only 2013-08-15 07:54:31 +00:00
pc98 MFi386: r254619 2013-08-22 16:39:59 +00:00
pci Update PCI drivers to no longer look at the MEMIO-enabled bit in the PCI 2013-08-12 23:30:01 +00:00
powerpc Newer versions of gcc define __INT64_C and __UINT64_C, so avoid 2013-09-03 22:04:55 +00:00
rpc Add support for host-based (Kerberos 5 service principal) initiator 2013-07-09 01:05:28 +00:00
security Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
sparc64 Significantly reduce the cost, i.e., run time, of calls to madvise(..., 2013-08-29 15:49:05 +00:00
sys Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
teken
tools MFC 2013-02-21 21:59:35 +00:00
ufs Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
vm Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
x86 Conform to style(9). No functional changes. 2013-09-01 23:49:36 +00:00
xdr Use m_get() and m_getcl() instead of compat macros. 2013-03-15 10:21:18 +00:00
xen Implement vector callback for PVHVM and unify event channel implementations 2013-08-29 19:52:18 +00:00
Makefile MFC 2013-03-13 01:05:42 +00:00