/*
- * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#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 <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/sysent.h>
+#include <sys/sysproto.h>
+#include <sys/kauth.h>
#include <bsm/audit_kernel.h>
extern void
-unix_syscall(
- struct savearea *regs
-);
+unix_syscall(struct savearea *regs);
+void
+unix_syscall_return(int error);
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);
* 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;
unsigned short code;
boolean_t flavor;
int funnel_type;
+ unsigned int cancel_enable;
- 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();
+ /*
+ * Delayed binding of thread credential to process credential, if we
+ * are not running with an explicitly set thread credential.
+ */
+ if (uthread->uu_ucred != proc->p_ucred &&
+ (uthread->uu_flag & UT_SETUID) == 0) {
+ kauth_cred_t old = uthread->uu_ucred;
+ proc_lock(proc);
+ uthread->uu_ucred = proc->p_ucred;
+ kauth_cred_ref(uthread->uu_ucred);
+ proc_unlock(proc);
+ if (old != NOCRED)
+ kauth_cred_rele(old);
+ }
+
uthread->uu_ar0 = (int *)regs;
callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
-#ifdef DEBUG
- if (callp->sy_narg > 8)
- panic("unix_syscall: max arg count exceeded");
-#endif
-
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_funnel & 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;
+unsafe:
+ cancel_enable = callp->sy_cancel;
+
+ if (cancel_enable == _SYSCALL_CANCEL_NONE) {
+ uthread->uu_flag |= UT_NOTCANCELPT;
+ } else {
+ if((uthread->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
+ if (cancel_enable == _SYSCALL_CANCEL_PRE) {
+ /* system call cancelled; return to handle cancellation */
+ regs->save_r3 = (long long)EINTR;
+ thread_exception_return();
+ /* NOTREACHED */
+ } else {
+ thread_abort_safely(thread_act);
+ }
+ }
+ }
+
+ funnel_type = (int)(callp->sy_funnel & FUNNEL_MASK);
if (funnel_type == KERNEL_FUNNEL)
enter_funnel_section(kernel_flock);
- else if (funnel_type == NETWORK_FUNNEL)
- enter_funnel_section(network_flock);
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);
+ ktrsyscall(proc, code, callp->sy_narg, uthread->uu_arg);
+#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_SYSCALL_EXIT(error, proc, uthread);
+#ifdef JOE_DEBUG
+ if (uthread->uu_iocount)
+ joe_debug("system call returned with uu_iocount != 0");
+#endif
regs = find_user_regs(thread_act);
if (error == ERESTART) {
/* 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();
+ if (KTRPOINT(proc, KTR_SYSRET)) {
+ switch(callp->sy_return_type) {
+ case _SYSCALL_RET_ADDR_T:
+ case _SYSCALL_RET_SIZE_T:
+ case _SYSCALL_RET_SSIZE_T:
+ /*
+ * Trace the value of the least significant bits,
+ * until we can revise the ktrace API safely.
+ */
+ ktrsysret(proc, code, error, uthread->uu_rval[1]);
+ break;
+ default:
+ ktrsysret(proc, code, error, uthread->uu_rval[0]);
+ break;
+ }
+ }
+ if (cancel_enable == _SYSCALL_CANCEL_NONE)
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
+
+ exit_funnel_section();
+
+ if (uthread->uu_lowpri_delay) {
+ /*
+ * 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
+ */
+ IOSleep(uthread->uu_lowpri_delay);
+ uthread->uu_lowpri_delay = 0;
+ }
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;
struct sysent *callp;
int funnel_type;
+ unsigned int cancel_enable;
- 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 >= nsysent) ? &sysent[63] : &sysent[code];
+
/*
* 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];
+ if (KTRPOINT(proc, KTR_SYSRET)) {
+ switch(callp->sy_return_type) {
+ case _SYSCALL_RET_ADDR_T:
+ case _SYSCALL_RET_SIZE_T:
+ case _SYSCALL_RET_SSIZE_T:
+ /*
+ * Trace the value of the least significant bits,
+ * until we can revise the ktrace API safely.
+ */
+ ktrsysret(proc, code, error, uthread->uu_rval[1]);
+ break;
+ default:
+ ktrsysret(proc, code, error, uthread->uu_rval[0]);
+ break;
+ }
+ }
- funnel_type = (int)callp->sy_funnel;
+ cancel_enable = callp->sy_cancel;
- if (KTRPOINT(proc, KTR_SYSRET))
- ktrsysret(proc, code, error, uthread->uu_rval[0], funnel_type);
+ if (cancel_enable == _SYSCALL_CANCEL_NONE)
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
- exit_funnel_section();
+ exit_funnel_section();
+ if (uthread->uu_lowpri_delay) {
+ /*
+ * 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
+ */
+ IOSleep(uthread->uu_lowpri_delay);
+ uthread->uu_lowpri_delay = 0;
+ }
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();
* 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.
+ *
+ * XXX Y2038 bug because of assumed return of 32 bit seconds value, and
+ * XXX first parameter to clock_gettimeofday()
*/
int
-ppc_gettimeofday(p, uap, retval)
- struct proc *p;
- register struct gettimeofday_args *uap;
- register_t *retval;
+ppc_gettimeofday(__unused struct proc *p,
+ register struct ppc_gettimeofday_args *uap,
+ register_t *retval)
{
int error = 0;
+ extern lck_spin_t * tz_slock;
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);
+ lck_spin_lock(tz_slock);
ltz = tz;
- usimple_unlock(&tz_slock);
- error = copyout((caddr_t)<z, (caddr_t)uap->tzp, sizeof (tz));
+ lck_spin_unlock(tz_slock);
+ error = copyout((caddr_t)<z, uap->tzp, sizeof (tz));
}
return (error);
}
+#ifdef JOE_DEBUG
+joe_debug(char *p) {
+
+ printf("%s\n", p);
+}
+#endif
+
+
+/*
+ * WARNING - this is a temporary workaround for binary compatibility issues
+ * with anti-piracy software that relies on patching ptrace (3928003).
+ * This KPI will be removed in the system release after Tiger.
+ */
+uintptr_t temp_patch_ptrace(uintptr_t new_ptrace)
+{
+ struct sysent * callp;
+ sy_call_t * old_ptrace;
+
+ if (new_ptrace == 0)
+ return(0);
+
+ enter_funnel_section(kernel_flock);
+ callp = &sysent[26];
+ old_ptrace = callp->sy_call;
+
+ /* only allow one patcher of ptrace */
+ if (old_ptrace == (sy_call_t *) ptrace) {
+ callp->sy_call = (sy_call_t *) new_ptrace;
+ }
+ else {
+ old_ptrace = NULL;
+ }
+ exit_funnel_section( );
+
+ return((uintptr_t)old_ptrace);
+}
+
+void temp_unpatch_ptrace(void)
+{
+ struct sysent * callp;
+
+ enter_funnel_section(kernel_flock);
+ callp = &sysent[26];
+ callp->sy_call = (sy_call_t *) ptrace;
+ exit_funnel_section( );
+
+ return;
+}
projects / apple / xnu.git / blobdiff