- Implement two new system calls:

	int bindat(int fd, int s, const struct sockaddr *addr, socklen_t addrlen);
	int connectat(int fd, int s, const struct sockaddr *name, socklen_t namelen);

  which allow to bind and connect respectively to a UNIX domain socket with a
  path relative to the directory associated with the given file descriptor 'fd'.

- Add manual pages for the new syscalls.

- Make the new syscalls available for processes in capability mode sandbox.

- Add capability rights CAP_BINDAT and CAP_CONNECTAT that has to be present on
  the directory descriptor for the syscalls to work.

- Update audit(4) to support those two new syscalls and to handle path
  in sockaddr_un structure relative to the given directory descriptor.

- Update procstat(1) to recognize the new capability rights.

- Document the new capability rights in cap_rights_limit(2).

Sponsored by:	The FreeBSD Foundation
Discussed with:	rwatson, jilles, kib, des

1 files changed, 8 insertions, 3 deletions

diff --git a/sys/sys/capability.h b/sys/sys/capability.h
index 27e56c2..0d1ea5c 100644
--- a/sys/sys/capability.h
+++ b/sys/sys/capability.h
@@ -182,13 +182,18 @@
 #define	CAP_PDWAIT		0x0020000000000000ULL
 #define	CAP_PDKILL		0x0040000000000000ULL
 
+/*
+ * Rights that allow to use bindat(2) and connectat(2) syscalls on a
+ * directory descriptor.
+ */
+#define	CAP_BINDAT		0x0400000000000000ULL
+#define	CAP_CONNECTAT		0x0800000000000000ULL
+
 /* The mask of all valid method rights. */
-#define	CAP_MASK_VALID		0x03ffffffffffffffULL
+#define	CAP_MASK_VALID		0x0fffffffffffffffULL
 #define	CAP_ALL			CAP_MASK_VALID
 
 /* Available bits. */
-#define	CAP_UNUSED5		0x0400000000000000ULL
-#define	CAP_UNUSED4		0x0800000000000000ULL
 #define	CAP_UNUSED3		0x1000000000000000ULL
 #define	CAP_UNUSED2		0x2000000000000000ULL
 #define	CAP_UNUSED1		0x4000000000000000ULL