/*
- * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+/*
+ * NOTICE: This file was modified by McAfee Research in 2004 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
*/
#include <kern/task.h>
#include <kern/thread.h>
-#include <kern/thread_act.h>
#include <kern/assert.h>
#include <kern/clock.h>
+#include <kern/locks.h>
+#include <kern/sched_prim.h>
#include <mach/machine/thread_status.h>
+#include <mach/thread_act.h>
#include <ppc/savearea.h>
#include <sys/kernel.h>
#include <sys/vm.h>
-#include <sys/proc.h>
+#include <sys/proc_internal.h>
#include <sys/syscall.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/errno.h>
-#include <sys/ktrace.h>
#include <sys/kdebug.h>
-#include <sys/kern_audit.h>
+#include <sys/sysent.h>
+#include <sys/sysproto.h>
+#include <sys/kauth.h>
+
+#include <bsm/audit_kernel.h>
+
+#if CONFIG_DTRACE
+extern int32_t dtrace_systrace_syscall(struct proc *, void *, int *);
+extern void dtrace_systrace_syscall_return(unsigned short, int, int *);
+#endif
extern void
-unix_syscall(
- struct savearea *regs
-);
+unix_syscall(struct savearea *regs);
extern struct savearea *
find_user_regs(
- thread_act_t act);
+ thread_t act);
-extern void enter_funnel_section(funnel_t *funnel_lock);
-extern void exit_funnel_section(void);
+extern lck_spin_t * tz_slock;
/*
* Function: unix_syscall
* Outputs: none
*/
void
-unix_syscall(
- struct savearea *regs
-)
+unix_syscall(struct savearea *regs)
{
- thread_act_t thread_act;
+ thread_t thread_act;
struct uthread *uthread;
struct proc *proc;
struct sysent *callp;
int error;
- unsigned short code;
+ unsigned int code;
boolean_t flavor;
- int funnel_type;
- flavor = (((unsigned int)regs->save_r0) == NULL)? 1: 0;
+ flavor = (((unsigned int)regs->save_r0) == 0)? 1: 0;
if (flavor)
code = regs->save_r3;
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
regs->save_r3, regs->save_r4, regs->save_r5, regs->save_r6, 0);
}
- thread_act = current_act();
+ thread_act = current_thread();
uthread = get_bsdthread_info(thread_act);
- if (!(uthread->uu_flag & P_VFORK))
+ if (!(uthread->uu_flag & UT_VFORK))
proc = (struct proc *)get_bsdtask_info(current_task());
else
proc = current_proc();
- uthread->uu_ar0 = (int *)regs;
+ /* Make sure there is a process associated with this task */
+ if (proc == NULL) {
+ regs->save_r3 = (long long)EPERM;
+ /* set the "pc" to execute cerror routine */
+ regs->save_srr0 -= 4;
+ task_terminate_internal(current_task());
+ thread_exception_return();
+ /* NOTREACHED */
+ }
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
+ /*
+ * Delayed binding of thread credential to process credential, if we
+ * are not running with an explicitly set thread credential.
+ */
+ kauth_cred_uthread_update(uthread, proc);
-#ifdef DEBUG
- if (callp->sy_narg > 8)
- panic("unix_syscall: max arg count exceeded");
-#endif
+ callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code];
if (callp->sy_narg != 0) {
+ void *regsp;
+ sy_munge_t *mungerp;
+
+ if (IS_64BIT_PROCESS(proc)) {
+ /* XXX Turn 64 bit unsafe calls into nosys() */
+ if (callp->sy_flags & UNSAFE_64BIT) {
+ callp = &sysent[63];
+ goto unsafe;
+ }
+ mungerp = callp->sy_arg_munge64;
+ }
+ else {
+ mungerp = callp->sy_arg_munge32;
+ }
if ( !flavor) {
- uthread->uu_arg[0] = regs->save_r3;
- uthread->uu_arg[1] = regs->save_r4;
- uthread->uu_arg[2] = regs->save_r5;
- uthread->uu_arg[3] = regs->save_r6;
- uthread->uu_arg[4] = regs->save_r7;
- uthread->uu_arg[5] = regs->save_r8;
- uthread->uu_arg[6] = regs->save_r9;
- uthread->uu_arg[7] = regs->save_r10;
+ regsp = (void *) ®s->save_r3;
} else {
- uthread->uu_arg[0] = regs->save_r4;
- uthread->uu_arg[1] = regs->save_r5;
- uthread->uu_arg[2] = regs->save_r6;
- uthread->uu_arg[3] = regs->save_r7;
- uthread->uu_arg[4] = regs->save_r8;
- uthread->uu_arg[5] = regs->save_r9;
- uthread->uu_arg[7] = regs->save_r10;
+ /* indirect system call consumes an argument so only 7 are supported */
+ if (callp->sy_narg > 7) {
+ callp = &sysent[63];
+ goto unsafe;
+ }
+ regsp = (void *) ®s->save_r4;
}
+ /* call syscall argument munger to copy in arguments (see xnu/bsd/dev/ppc/munge.s) */
+ (*mungerp)(regsp, (void *) &uthread->uu_arg[0]);
}
- funnel_type = (int)callp->sy_funnel;
- if (funnel_type == KERNEL_FUNNEL)
- enter_funnel_section(kernel_flock);
- else if (funnel_type == NETWORK_FUNNEL)
- enter_funnel_section(network_flock);
+unsafe:
+ uthread->uu_flag |= UT_NOTCANCELPT;
+
uthread->uu_rval[0] = 0;
/*
*/
regs->save_srr0 += 4;
- if (KTRPOINT(proc, KTR_SYSCALL))
- ktrsyscall(proc, code, callp->sy_narg, uthread->uu_arg, funnel_type);
-
- AUDIT_CMD(audit_syscall_enter(code, proc, uthread));
+#ifdef JOE_DEBUG
+ uthread->uu_iocount = 0;
+ uthread->uu_vpindex = 0;
+#endif
+ AUDIT_SYSCALL_ENTER(code, proc, uthread);
error = (*(callp->sy_call))(proc, (void *)uthread->uu_arg, &(uthread->uu_rval[0]));
- AUDIT_CMD(audit_syscall_exit(error, proc, uthread));
+ AUDIT_SYSCALL_EXIT(code, proc, uthread, error);
+#if CONFIG_MACF
+ mac_thread_userret(code, error, thread_act);
+#endif
+
+
+#ifdef JOE_DEBUG
+ if (uthread->uu_iocount)
+ joe_debug("system call returned with uu_iocount != 0");
+#endif
+#if CONFIG_DTRACE
+ uthread->t_dtrace_errno = error;
+#endif /* CONFIG_DTRACE */
regs = find_user_regs(thread_act);
/* set the "pc" to execute cerror routine */
regs->save_srr0 -= 4;
} else { /* (not error) */
- regs->save_r3 = uthread->uu_rval[0];
- regs->save_r4 = uthread->uu_rval[1];
+ switch (callp->sy_return_type) {
+ case _SYSCALL_RET_INT_T:
+ regs->save_r3 = uthread->uu_rval[0];
+ regs->save_r4 = uthread->uu_rval[1];
+ break;
+ case _SYSCALL_RET_UINT_T:
+ regs->save_r3 = ((u_int)uthread->uu_rval[0]);
+ regs->save_r4 = ((u_int)uthread->uu_rval[1]);
+ break;
+ case _SYSCALL_RET_OFF_T:
+ /* off_t returns 64 bits split across two registers for 32 bit */
+ /* process and in one register for 64 bit process */
+ if (IS_64BIT_PROCESS(proc)) {
+ u_int64_t *retp = (u_int64_t *)&uthread->uu_rval[0];
+ regs->save_r3 = *retp;
+ regs->save_r4 = 0;
+ }
+ else {
+ regs->save_r3 = uthread->uu_rval[0];
+ regs->save_r4 = uthread->uu_rval[1];
+ }
+ break;
+ case _SYSCALL_RET_ADDR_T:
+ case _SYSCALL_RET_SIZE_T:
+ case _SYSCALL_RET_SSIZE_T:
+ /* the variable length return types (user_addr_t, user_ssize_t,
+ * and user_size_t) are always the largest possible size in the
+ * kernel (we use uu_rval[0] and [1] as one 64 bit value).
+ */
+ {
+ user_addr_t *retp = (user_addr_t *)&uthread->uu_rval[0];
+ regs->save_r3 = *retp;
+ regs->save_r4 = 0;
+ }
+ break;
+ case _SYSCALL_RET_NONE:
+ break;
+ default:
+ panic("unix_syscall: unknown return type");
+ break;
+ }
}
}
/* else (error == EJUSTRETURN) { nothing } */
- if (KTRPOINT(proc, KTR_SYSRET))
- ktrsysret(proc, code, error, uthread->uu_rval[0], funnel_type);
- exit_funnel_section();
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
+
+ /* panic if funnel is held */
+ syscall_exit_funnelcheck();
+ if (uthread->uu_lowpri_window) {
+ /*
+ * task is marked as a low priority I/O type
+ * and the I/O we issued while in this system call
+ * collided with normal I/O operations... we'll
+ * delay in order to mitigate the impact of this
+ * task on the normal operation of the system
+ */
+ throttle_lowpri_io(TRUE);
+ }
if (kdebug_enable && (code != 180)) {
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
+
+ if (callp->sy_return_type == _SYSCALL_RET_SSIZE_T)
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[1], 0, 0, 0);
+ else
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
}
thread_exception_return();
/* NOTREACHED */
}
-unix_syscall_return(error)
+void
+unix_syscall_return(int error)
{
- thread_act_t thread_act;
+ thread_t thread_act;
struct uthread *uthread;
struct proc *proc;
struct savearea *regs;
- unsigned short code;
+ unsigned int code;
struct sysent *callp;
- int funnel_type;
- thread_act = current_act();
+ thread_act = current_thread();
proc = current_proc();
uthread = get_bsdthread_info(thread_act);
regs = find_user_regs(thread_act);
+ if (regs->save_r0 != 0)
+ code = regs->save_r0;
+ else
+ code = regs->save_r3;
+
+ callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code];
+
+#if CONFIG_DTRACE
+ if (callp->sy_call == dtrace_systrace_syscall)
+ dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
+#endif /* CONFIG_DTRACE */
+
/*
* Get index into sysent table
*/
/* set the "pc" to execute cerror routine */
regs->save_srr0 -= 4;
} else { /* (not error) */
- regs->save_r3 = uthread->uu_rval[0];
- regs->save_r4 = uthread->uu_rval[1];
+ switch (callp->sy_return_type) {
+ case _SYSCALL_RET_INT_T:
+ regs->save_r3 = uthread->uu_rval[0];
+ regs->save_r4 = uthread->uu_rval[1];
+ break;
+ case _SYSCALL_RET_UINT_T:
+ regs->save_r3 = ((u_int)uthread->uu_rval[0]);
+ regs->save_r4 = ((u_int)uthread->uu_rval[1]);
+ break;
+ case _SYSCALL_RET_OFF_T:
+ /* off_t returns 64 bits split across two registers for 32 bit */
+ /* process and in one register for 64 bit process */
+ if (IS_64BIT_PROCESS(proc)) {
+ u_int64_t *retp = (u_int64_t *)&uthread->uu_rval[0];
+ regs->save_r3 = *retp;
+ }
+ else {
+ regs->save_r3 = uthread->uu_rval[0];
+ regs->save_r4 = uthread->uu_rval[1];
+ }
+ break;
+ case _SYSCALL_RET_ADDR_T:
+ case _SYSCALL_RET_SIZE_T:
+ case _SYSCALL_RET_SSIZE_T:
+ /* the variable length return types (user_addr_t, user_ssize_t,
+ * and user_size_t) are always the largest possible size in the
+ * kernel (we use uu_rval[0] and [1] as one 64 bit value).
+ */
+ {
+ u_int64_t *retp = (u_int64_t *)&uthread->uu_rval[0];
+ regs->save_r3 = *retp;
+ }
+ break;
+ case _SYSCALL_RET_NONE:
+ break;
+ default:
+ panic("unix_syscall: unknown return type");
+ break;
+ }
}
}
/* else (error == EJUSTRETURN) { nothing } */
- if (regs->save_r0 != NULL)
- code = regs->save_r0;
- else
- code = regs->save_r3;
-
- callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
-
- funnel_type = (int)callp->sy_funnel;
- if (KTRPOINT(proc, KTR_SYSRET))
- ktrsysret(proc, code, error, uthread->uu_rval[0], funnel_type);
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
- exit_funnel_section();
+ /* panic if funnel is held */
+ syscall_exit_funnelcheck();
+ if (uthread->uu_lowpri_window) {
+ /*
+ * task is marked as a low priority I/O type
+ * and the I/O we issued while in this system call
+ * collided with normal I/O operations... we'll
+ * delay in order to mitigate the impact of this
+ * task on the normal operation of the system
+ */
+ throttle_lowpri_io(TRUE);
+ }
if (kdebug_enable && (code != 180)) {
- KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
+ if (callp->sy_return_type == _SYSCALL_RET_SSIZE_T)
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[1], 0, 0, 0);
+ else
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
}
thread_exception_return();
/* NOTREACHED */
}
-/*
- * Time of day and interval timer support.
- *
- * These routines provide the kernel entry points to get and set
- * the time-of-day and per-process interval timers. Subroutines
- * here provide support for adding and subtracting timeval structures
- * and decrementing interval timers, optionally reloading the interval
- * timers when they expire.
- */
-struct gettimeofday_args{
- struct timeval *tp;
- struct timezone *tzp;
-};
-/* NOTE THIS implementation is for ppc architectures only.
- * It is infrequently called, since the commpage intercepts
- * most calls in user mode.
- */
-int
-ppc_gettimeofday(p, uap, retval)
- struct proc *p;
- register struct gettimeofday_args *uap;
- register_t *retval;
-{
- int error = 0;
+#ifdef JOE_DEBUG
+joe_debug(char *p) {
- if (uap->tp)
- clock_gettimeofday(&retval[0], &retval[1]);
-
- if (uap->tzp) {
- struct timezone ltz;
- extern simple_lock_data_t tz_slock;
-
- usimple_lock(&tz_slock);
- ltz = tz;
- usimple_unlock(&tz_slock);
- error = copyout((caddr_t)<z, (caddr_t)uap->tzp, sizeof (tz));
- }
-
- return (error);
+ printf("%s\n", p);
}
-
+#endif
projects / apple / xnu.git / blobdiff