* Copyright (c) 2000-2016 Apple 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
* 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
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <kern/task.h>
#include <kern/debug.h>
#include <mach/machine/thread_status.h>
#include <mach/thread_act.h>
-#include <mach/branch_predicates.h>
#include <sys/kernel.h>
#include <sys/vm.h>
#include <sys/sysproto.h>
#include <sys/kauth.h>
#include <sys/systm.h>
+#include <sys/bitstring.h>
#include <security/audit/audit.h>
#include <machine/pal_routines.h>
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
#if CONFIG_DTRACE
extern int32_t dtrace_systrace_syscall(struct proc *, void *, int *);
extern void dtrace_systrace_syscall_return(unsigned short, int, int *);
extern const char *syscallnames[];
#define code_is_kdebug_trace(code) (((code) == SYS_kdebug_trace) || \
- ((code) == SYS_kdebug_trace64) || \
- ((code) == SYS_kdebug_trace_string))
+ ((code) == SYS_kdebug_trace64) || \
+ ((code) == SYS_kdebug_trace_string))
/*
* Function: unix_syscall
void
unix_syscall(x86_saved_state_t *state)
{
- thread_t thread;
- void *vt;
- unsigned int code;
- struct sysent *callp;
-
- int error;
- vm_offset_t params;
- struct proc *p;
- struct uthread *uthread;
- x86_saved_state32_t *regs;
- boolean_t is_vfork;
- pid_t pid;
+ thread_t thread;
+ void *vt;
+ unsigned int code, syscode;
+ const struct sysent *callp;
+
+ int error;
+ vm_offset_t params;
+ struct proc *p;
+ struct uthread *uthread;
+ x86_saved_state32_t *regs;
+ boolean_t is_vfork;
+ pid_t pid;
assert(is_saved_state32(state));
regs = saved_state32(state);
#if DEBUG
- if (regs->eax == 0x800)
+ if (regs->eax == 0x800) {
thread_exception_return();
+ }
#endif
thread = current_thread();
uthread = get_bsdthread_info(thread);
/* Get the approriate proc; may be different from task's for vfork() */
is_vfork = uthread->uu_flag & UT_VFORK;
- if (__improbable(is_vfork != 0))
+ if (__improbable(is_vfork != 0)) {
p = current_proc();
- else
+ } else {
p = (struct proc *)get_bsdtask_info(current_task());
+ }
- code = regs->eax & I386_SYSCALL_NUMBER_MASK;
+ code = regs->eax & I386_SYSCALL_NUMBER_MASK;
+ syscode = (code < nsysent) ? code : SYS_invalid;
DEBUG_KPRINT_SYSCALL_UNIX("unix_syscall: code=%d(%s) eip=%u\n",
- code, syscallnames[code >= nsysent ? SYS_invalid : code], (uint32_t)regs->eip);
- params = (vm_offset_t) (regs->uesp + sizeof (int));
+ code, syscallnames[syscode], (uint32_t)regs->eip);
+ params = (vm_offset_t) (regs->uesp + sizeof(int));
regs->efl &= ~(EFL_CF);
- callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
+ callp = &sysent[syscode];
if (__improbable(callp == sysent)) {
code = fuword(params);
params += sizeof(int);
- callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
+ syscode = (code < nsysent) ? code : SYS_invalid;
+ callp = &sysent[syscode];
}
vt = (void *)uthread->uu_arg;
if (callp->sy_arg_bytes != 0) {
#if CONFIG_REQUIRES_U32_MUNGING
- sy_munge_t *mungerp;
+ sy_munge_t *mungerp;
#else
#error U32 syscalls on x86_64 kernel requires munging
#endif
- uint32_t nargs;
+ uint32_t nargs;
- assert((unsigned) callp->sy_arg_bytes <= sizeof (uthread->uu_arg));
+ assert((unsigned) callp->sy_arg_bytes <= sizeof(uthread->uu_arg));
nargs = callp->sy_arg_bytes;
error = copyin((user_addr_t) params, (char *) vt, nargs);
if (error) {
}
if (__probable(!code_is_kdebug_trace(code))) {
- int *ip = (int *)vt;
-
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- *ip, *(ip+1), *(ip+2), *(ip+3), 0);
+ uint32_t *uip = vt;
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
+ uip[0], uip[1], uip[2], uip[3]);
}
#if CONFIG_REQUIRES_U32_MUNGING
mungerp = callp->sy_arg_munge32;
- if (mungerp != NULL)
+ if (mungerp != NULL) {
(*mungerp)(vt);
+ }
#endif
- } else
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- 0, 0, 0, 0, 0);
+ } else {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START);
+ }
/*
* Delayed binding of thread credential to process credential, if we
pid = proc_pid(p);
#ifdef JOE_DEBUG
- uthread->uu_iocount = 0;
- uthread->uu_vpindex = 0;
+ uthread->uu_iocount = 0;
+ uthread->uu_vpindex = 0;
#endif
+#if CONFIG_MACF
+ if (__improbable(p->syscall_filter_mask != NULL && !bitstr_test(p->syscall_filter_mask, syscode))) {
+ error = mac_proc_check_syscall_unix(p, syscode);
+ if (error) {
+ goto skip_syscall;
+ }
+ }
+#endif /* CONFIG_MACF */
+
AUDIT_SYSCALL_ENTER(code, p, uthread);
error = (*(callp->sy_call))((void *) p, (void *) vt, &(uthread->uu_rval[0]));
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
+#if CONFIG_MACF
+skip_syscall:
+#endif /* CONFIG_MACF */
+
#ifdef JOE_DEBUG
- if (uthread->uu_iocount)
- printf("system call returned with uu_iocount != 0\n");
+ if (uthread->uu_iocount) {
+ printf("system call returned with uu_iocount != 0\n");
+ }
#endif
#if CONFIG_DTRACE
uthread->t_dtrace_errno = error;
*/
pal_syscall_restart(thread, state);
- }
- else if (error != EJUSTRETURN) {
+ } else if (error != EJUSTRETURN) {
if (__improbable(error)) {
- regs->eax = error;
- regs->efl |= EFL_CF; /* carry bit */
+ regs->eax = error;
+ regs->efl |= EFL_CF; /* carry bit */
} else { /* (not error) */
- /*
- * We split retval across two registers, in case the
- * syscall had a 64-bit return value, in which case
- * eax/edx matches the function call ABI.
- */
- regs->eax = uthread->uu_rval[0];
- regs->edx = uthread->uu_rval[1];
- }
+ /*
+ * We split retval across two registers, in case the
+ * syscall had a 64-bit return value, in which case
+ * eax/edx matches the function call ABI.
+ */
+ regs->eax = uthread->uu_rval[0];
+ regs->edx = uthread->uu_rval[1];
+ }
}
DEBUG_KPRINT_SYSCALL_UNIX(
error, regs->eax, regs->edx);
uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->syscall_code = 0;
+
+#if DEBUG || DEVELOPMENT
+ kern_allocation_name_t
+ prior __assert_only = thread_set_allocation_name(NULL);
+ assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
+#endif /* DEBUG || DEVELOPMENT */
if (__improbable(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
*/
throttle_lowpri_io(1);
}
- if (__probable(!code_is_kdebug_trace(code)))
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], pid, 0);
+ if (__probable(!code_is_kdebug_trace(code))) {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], pid);
+ }
if (__improbable(!is_vfork && callp->sy_call == (sy_call_t *)execve && !error)) {
pal_execve_return(thread);
void
unix_syscall64(x86_saved_state_t *state)
{
- thread_t thread;
- void *vt;
- unsigned int code;
- struct sysent *callp;
- int args_in_regs;
- boolean_t args_start_at_rdi;
- int error;
- struct proc *p;
- struct uthread *uthread;
+ thread_t thread;
+ void *vt;
+ unsigned int code, syscode;
+ const struct sysent *callp;
+ int args_in_regs;
+ boolean_t args_start_at_rdi;
+ int error;
+ struct proc *p;
+ struct uthread *uthread;
x86_saved_state64_t *regs;
- pid_t pid;
+ pid_t pid;
assert(is_saved_state64(state));
regs = saved_state64(state);
-#if DEBUG
- if (regs->rax == 0x2000800)
+#if DEBUG
+ if (regs->rax == 0x2000800) {
thread_exception_return();
+ }
#endif
thread = current_thread();
uthread = get_bsdthread_info(thread);
uthread_reset_proc_refcount(uthread);
/* Get the approriate proc; may be different from task's for vfork() */
- if (__probable(!(uthread->uu_flag & UT_VFORK)))
+ if (__probable(!(uthread->uu_flag & UT_VFORK))) {
p = (struct proc *)get_bsdtask_info(current_task());
- else
+ } else {
p = current_proc();
+ }
/* Verify that we are not being called from a task without a proc */
if (__improbable(p == NULL)) {
/* NOTREACHED */
}
- code = regs->rax & SYSCALL_NUMBER_MASK;
+ code = regs->rax & SYSCALL_NUMBER_MASK;
+ syscode = (code < nsysent) ? code : SYS_invalid;
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall64: code=%d(%s) rip=%llx\n",
- code, syscallnames[code >= nsysent ? SYS_invalid : code], regs->isf.rip);
- callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
+ code, syscallnames[syscode], regs->isf.rip);
+ callp = &sysent[syscode];
vt = (void *)uthread->uu_arg;
if (__improbable(callp == sysent)) {
- /*
+ /*
* indirect system call... system call number
* passed as 'arg0'
*/
- code = regs->rdi;
- callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
+ code = regs->rdi;
+ syscode = (code < nsysent) ? code : SYS_invalid;
+ callp = &sysent[syscode];
args_start_at_rdi = FALSE;
args_in_regs = 5;
} else {
args_in_regs = MIN(args_in_regs, callp->sy_narg);
memcpy(vt, args_start_at_rdi ? ®s->rdi : ®s->rsi, args_in_regs * sizeof(syscall_arg_t));
-
if (!code_is_kdebug_trace(code)) {
- uint64_t *ip = (uint64_t *)vt;
+ uint64_t *uip = vt;
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- (int)(*ip), (int)(*(ip+1)), (int)(*(ip+2)), (int)(*(ip+3)), 0);
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
+ uip[0], uip[1], uip[2], uip[3]);
}
if (__improbable(callp->sy_narg > args_in_regs)) {
/* NOTREACHED */
}
}
- } else
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
- 0, 0, 0, 0, 0);
+ } else {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START);
+ }
/*
* Delayed binding of thread credential to process credential, if we
pid = proc_pid(p);
#ifdef JOE_DEBUG
- uthread->uu_iocount = 0;
- uthread->uu_vpindex = 0;
+ uthread->uu_iocount = 0;
+ uthread->uu_vpindex = 0;
#endif
+#if CONFIG_MACF
+ if (__improbable(p->syscall_filter_mask != NULL && !bitstr_test(p->syscall_filter_mask, syscode))) {
+ error = mac_proc_check_syscall_unix(p, syscode);
+ if (error) {
+ goto skip_syscall;
+ }
+ }
+#endif /* CONFIG_MACF */
+
AUDIT_SYSCALL_ENTER(code, p, uthread);
error = (*(callp->sy_call))((void *) p, vt, &(uthread->uu_rval[0]));
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
+#if CONFIG_MACF
+skip_syscall:
+#endif /* CONFIG_MACF */
+
#ifdef JOE_DEBUG
- if (uthread->uu_iocount)
- printf("system call returned with uu_iocount != 0\n");
+ if (uthread->uu_iocount) {
+ printf("system call returned with uu_iocount != 0\n");
+ }
#endif
#if CONFIG_DTRACE
uthread->t_dtrace_errno = error;
#endif /* CONFIG_DTRACE */
-
+
if (__improbable(error == ERESTART)) {
/*
* all system calls come through via the syscall instruction
* move the user's pc back to repeat the syscall:
*/
pal_syscall_restart( thread, state );
- }
- else if (error != EJUSTRETURN) {
+ } else if (error != EJUSTRETURN) {
if (__improbable(error)) {
regs->rax = error;
- regs->isf.rflags |= EFL_CF; /* carry bit */
+ regs->isf.rflags |= EFL_CF; /* carry bit */
} else { /* (not error) */
-
switch (callp->sy_return_type) {
case _SYSCALL_RET_INT_T:
regs->rax = uthread->uu_rval[0];
case _SYSCALL_RET_SIZE_T:
case _SYSCALL_RET_SSIZE_T:
case _SYSCALL_RET_UINT64_T:
- regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
+ regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
regs->rdx = 0;
break;
case _SYSCALL_RET_NONE:
break;
}
regs->isf.rflags &= ~EFL_CF;
- }
+ }
}
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall64: error=%d retval=(%llu,%llu)\n",
error, regs->rax, regs->rdx);
-
+
uthread->uu_flag &= ~UT_NOTCANCELPT;
+ uthread->syscall_code = 0;
+
+#if DEBUG || DEVELOPMENT
+ kern_allocation_name_t
+ prior __assert_only = thread_set_allocation_name(NULL);
+ assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
+#endif /* DEBUG || DEVELOPMENT */
if (__improbable(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
*/
throttle_lowpri_io(1);
}
- if (__probable(!code_is_kdebug_trace(code)))
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], pid, 0);
+ if (__probable(!code_is_kdebug_trace(code))) {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], pid);
+ }
#if PROC_REF_DEBUG
if (__improbable(uthread_get_proc_refcount(uthread))) {
void
unix_syscall_return(int error)
{
- thread_t thread;
- struct uthread *uthread;
+ thread_t thread;
+ struct uthread *uthread;
struct proc *p;
unsigned int code;
- struct sysent *callp;
+ const struct sysent *callp;
thread = current_thread();
uthread = get_bsdthread_info(thread);
callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
#if CONFIG_DTRACE
- if (callp->sy_call == dtrace_systrace_syscall)
+ if (callp->sy_call == dtrace_systrace_syscall) {
dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
+ }
#endif /* CONFIG_DTRACE */
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
/*
* repeat the syscall
*/
- pal_syscall_restart( thread, find_user_regs(thread) );
- }
- else if (error != EJUSTRETURN) {
+ pal_syscall_restart( thread, find_user_regs(thread));
+ } else if (error != EJUSTRETURN) {
if (error) {
regs->rax = error;
- regs->isf.rflags |= EFL_CF; /* carry bit */
+ regs->isf.rflags |= EFL_CF; /* carry bit */
} else { /* (not error) */
-
switch (callp->sy_return_type) {
case _SYSCALL_RET_INT_T:
regs->rax = uthread->uu_rval[0];
break;
}
regs->isf.rflags &= ~EFL_CF;
- }
+ }
}
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall_return: error=%d retval=(%llu,%llu)\n",
error, regs->rax, regs->rdx);
} else {
- x86_saved_state32_t *regs;
+ x86_saved_state32_t *regs;
regs = saved_state32(find_user_regs(thread));
callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code];
#if CONFIG_DTRACE
- if (callp->sy_call == dtrace_systrace_syscall)
+ if (callp->sy_call == dtrace_systrace_syscall) {
dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
+ }
#endif /* CONFIG_DTRACE */
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
if (error == ERESTART) {
- pal_syscall_restart( thread, find_user_regs(thread) );
- }
- else if (error != EJUSTRETURN) {
+ pal_syscall_restart( thread, find_user_regs(thread));
+ } else if (error != EJUSTRETURN) {
if (error) {
regs->eax = error;
- regs->efl |= EFL_CF; /* carry bit */
+ regs->efl |= EFL_CF; /* carry bit */
} else { /* (not error) */
regs->eax = uthread->uu_rval[0];
regs->edx = uthread->uu_rval[1];
- }
+ }
}
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall_return: error=%d retval=(%u,%u)\n",
uthread->uu_flag &= ~UT_NOTCANCELPT;
+#if DEBUG || DEVELOPMENT
+ kern_allocation_name_t
+ prior __assert_only = thread_set_allocation_name(NULL);
+ assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior));
+#endif /* DEBUG || DEVELOPMENT */
+
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
*/
throttle_lowpri_io(1);
}
- if (!code_is_kdebug_trace(code))
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
- error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid, 0);
+ if (!code_is_kdebug_trace(code)) {
+ KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
+ error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid);
+ }
thread_exception_return();
/* NOTREACHED */
projects / apple / xnu.git / blobdiff