Make AIO a loadable module.

Remove the explicit call to aio_proc_rundown() from exit1(), instead AIO
will use at_exit(9).

Add functions at_exec(9), rm_at_exec(9) which function nearly the
same as at_exec(9) and rm_at_exec(9), these functions are called
on behalf of modules at the time of execve(2) after the image
activator has run.

Use a modified version of tegge's suggestion via at_exec(9) to close
an exploitable race in AIO.

Fix SYSCALL_MODULE_HELPER such that it's archetecuterally neutral,
the problem was that one had to pass it a paramater indicating the
number of arguments which were actually the number of "int".  Fix
it by using an inline version of the AS macro against the syscall
arguments.  (AS should be available globally but we'll get to that
later.)

Add a primative system for dynamically adding kqueue ops, it's really
not as sophisticated as it should be, but I'll discuss with jlemon when
he's around.

1 files changed, 8 insertions, 8 deletions

diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
index 050adb3..7eb38c8 100644
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -454,13 +454,13 @@
 311	MSTD	BSD	{ int setresuid(uid_t ruid, uid_t euid, uid_t suid); }
 312	MSTD	BSD	{ int setresgid(gid_t rgid, gid_t egid, gid_t sgid); }
 313	OBSOL	NOHIDE	signanosleep
-314     STD     BSD     { int aio_return(struct aiocb *aiocbp); }
-315     STD     BSD     { int aio_suspend(struct aiocb * const * aiocbp, int nent, const struct timespec *timeout); }
-316     STD     BSD     { int aio_cancel(int fd, struct aiocb *aiocbp); }
-317     STD     BSD     { int aio_error(struct aiocb *aiocbp); }
-318     STD     BSD     { int aio_read(struct aiocb *aiocbp); }
-319     STD     BSD     { int aio_write(struct aiocb *aiocbp); }
-320     STD     BSD     { int lio_listio(int mode, struct aiocb * const *acb_list, int nent, struct sigevent *sig); }
+314     NOSTD   BSD     { int aio_return(struct aiocb *aiocbp); }
+315     NOSTD   BSD     { int aio_suspend(struct aiocb * const * aiocbp, int nent, const struct timespec *timeout); }
+316     NOSTD   BSD     { int aio_cancel(int fd, struct aiocb *aiocbp); }
+317     NOSTD   BSD     { int aio_error(struct aiocb *aiocbp); }
+318     NOSTD   BSD     { int aio_read(struct aiocb *aiocbp); }
+319     NOSTD   BSD     { int aio_write(struct aiocb *aiocbp); }
+320     NOSTD   BSD     { int lio_listio(int mode, struct aiocb * const *acb_list, int nent, struct sigevent *sig); }
 321     MSTD	BSD     { int yield(void); }
 322	OBSOL	NOHIDE	thr_sleep
 323	OBSOL	NOHIDE	thr_wakeup
@@ -519,7 +519,7 @@
 			    struct iovec *iovp, unsigned iovcnt); }
 358	STD	BSD	{ int extattr_delete_file(const char *path, \
 			    int attrnamespace, const char *attrname); }
-359	STD	BSD	{ int aio_waitcomplete(struct aiocb **aiocbp, struct timespec *timeout); }
+359	NOSTD	BSD	{ int aio_waitcomplete(struct aiocb **aiocbp, struct timespec *timeout); }
 360	MSTD	BSD	{ int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid); }
 361	MSTD	BSD	{ int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid); }
 362	MSTD	BSD	{ int kqueue(void); }