/*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <sys/mount_internal.h>
#include <sys/sysproto.h>
+#include <sys/kdebug.h>
+#include <sys/codesign.h> /* cs_allow_invalid() */
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <kern/task.h>
#include <kern/thread.h>
+#include <mach/task.h> /* for task_resume() */
+#include <kern/sched_prim.h> /* for thread_exception_return() */
+
+#include <pexpert/pexpert.h>
+
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+/* XXX ken/bsd_kern.c - prototype should be in common header */
+int get_task_userstop(task_t);
/* Macros to clear/set/test flags. */
#define SET(t, f) (t) |= (f)
*/
int
-ptrace(p, uap, retval)
- struct proc *p;
- struct ptrace_args *uap;
- register_t *retval;
+ptrace(struct proc *p, struct ptrace_args *uap, int32_t *retval)
{
struct proc *t = current_proc(); /* target process */
task_t task;
thread_t th_act;
struct uthread *ut;
int tr_sigexc = 0;
+ int error = 0;
+ int stopped = 0;
AUDIT_ARG(cmd, uap->req);
AUDIT_ARG(pid, uap->pid);
AUDIT_ARG(addr, uap->addr);
- AUDIT_ARG(value, uap->data);
+ AUDIT_ARG(value32, uap->data);
if (uap->req == PT_DENY_ATTACH) {
- if (ISSET(p->p_flag, P_TRACED)) {
+#if (DEVELOPMENT || DEBUG) && CONFIG_EMBEDDED
+ if (PE_i_can_has_debugger(NULL))
+ return(0);
+#endif
+ proc_lock(p);
+ if (ISSET(p->p_lflag, P_LTRACED)) {
+ proc_unlock(p);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_FRCEXIT) | DBG_FUNC_NONE,
+ p->p_pid, W_EXITCODE(ENOTSUP, 0), 4, 0, 0);
exit1(p, W_EXITCODE(ENOTSUP, 0), retval);
- /* drop funnel before we return */
- thread_funnel_set(kernel_flock, FALSE);
+
thread_exception_return();
/* NOTREACHED */
}
- SET(p->p_flag, P_NOATTACH);
+ SET(p->p_lflag, P_LNOATTACH);
+ proc_unlock(p);
return(0);
}
if (uap->req == PT_FORCEQUOTA) {
- if (is_suser()) {
- SET(t->p_flag, P_FORCEQUOTA);
+ if (kauth_cred_issuser(kauth_cred_get())) {
+ OSBitOrAtomic(P_FORCEQUOTA, &t->p_flag);
return (0);
} else
return (EPERM);
* Intercept and deal with "please trace me" request.
*/
if (uap->req == PT_TRACE_ME) {
- SET(p->p_flag, P_TRACED);
- /* Non-attached case, our tracer is our parent. */
- t->p_oppid = t->p_pptr->p_pid;
- return(0);
+retry_trace_me:;
+ proc_t pproc = proc_parent(p);
+ if (pproc == NULL)
+ return (EINVAL);
+#if CONFIG_MACF
+ /*
+ * NB: Cannot call kauth_authorize_process(..., KAUTH_PROCESS_CANTRACE, ...)
+ * since that assumes the process being checked is the current process
+ * when, in this case, it is the current process's parent.
+ * Most of the other checks in cantrace() don't apply either.
+ */
+ if ((error = mac_proc_check_debug(pproc, p)) == 0) {
+#endif
+ proc_lock(p);
+ /* Make sure the process wasn't re-parented. */
+ if (p->p_ppid != pproc->p_pid) {
+ proc_unlock(p);
+ proc_rele(pproc);
+ goto retry_trace_me;
+ }
+ SET(p->p_lflag, P_LTRACED);
+ /* Non-attached case, our tracer is our parent. */
+ p->p_oppid = p->p_ppid;
+ proc_unlock(p);
+ /* Child and parent will have to be able to run modified code. */
+ cs_allow_invalid(p);
+ cs_allow_invalid(pproc);
+#if CONFIG_MACF
+ }
+#endif
+ proc_rele(pproc);
+ return (error);
}
if (uap->req == PT_SIGEXC) {
- if (ISSET(p->p_flag, P_TRACED)) {
- SET(p->p_flag, P_SIGEXC);
+ proc_lock(p);
+ if (ISSET(p->p_lflag, P_LTRACED)) {
+ SET(p->p_lflag, P_LSIGEXC);
+ proc_unlock(p);
return(0);
- } else
+ } else {
+ proc_unlock(p);
return(EINVAL);
+ }
+ }
+
+ /*
+ * We do not want ptrace to do anything with kernel or launchd
+ */
+ if (uap->pid < 2) {
+ return(EPERM);
}
/*
* Locate victim, and make sure it is traceable.
*/
- if ((t = pfind(uap->pid)) == NULL)
+ if ((t = proc_find(uap->pid)) == NULL)
return (ESRCH);
AUDIT_ARG(process, t);
- /* We do not want ptrace to do anything with kernel, init
- * and mach_init
- */
- if (uap->pid <=2 )
- return (EPERM);
-
task = t->task;
if (uap->req == PT_ATTACHEXC) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
uap->req = PT_ATTACH;
tr_sigexc = 1;
}
if (uap->req == PT_ATTACH) {
+#pragma clang diagnostic pop
int err;
-
+
+#if CONFIG_EMBEDDED
+ if (tr_sigexc == 0) {
+ error = ENOTSUP;
+ goto out;
+ }
+#endif
+
if ( kauth_authorize_process(proc_ucred(p), KAUTH_PROCESS_CANTRACE,
t, (uintptr_t)&err, 0, 0) == 0 ) {
/* it's OK to attach */
- SET(t->p_flag, P_TRACED);
+ proc_lock(t);
+ SET(t->p_lflag, P_LTRACED);
if (tr_sigexc)
- SET(t->p_flag, P_SIGEXC);
+ SET(t->p_lflag, P_LSIGEXC);
- t->p_oppid = t->p_pptr->p_pid;
+ t->p_oppid = t->p_ppid;
+ /* Check whether child and parent are allowed to run modified
+ * code (they'll have to) */
+ proc_unlock(t);
+ cs_allow_invalid(t);
+ cs_allow_invalid(p);
if (t->p_pptr != p)
- proc_reparent(t, p);
+ proc_reparentlocked(t, p, 1, 0);
- if (get_task_userstop(task) == 0 ) {
- t->p_xstat = 0;
- psignal(t, SIGSTOP);
- } else {
- t->p_xstat = SIGSTOP;
- task_resume(task);
+ proc_lock(t);
+ if (get_task_userstop(task) > 0 ) {
+ stopped = 1;
}
- return(0);
+ t->p_xstat = 0;
+ proc_unlock(t);
+ psignal(t, SIGSTOP);
+ /*
+ * If the process was stopped, wake up and run through
+ * issignal() again to properly connect to the tracing
+ * process.
+ */
+ if (stopped)
+ task_resume(task);
+ error = 0;
+ goto out;
}
else {
/* not allowed to attach, proper error code returned by kauth_authorize_process */
- if (ISSET(t->p_flag, P_NOATTACH)) {
+ if (ISSET(t->p_lflag, P_LNOATTACH)) {
psignal(p, SIGSEGV);
}
- return (err);
+
+ error = err;
+ goto out;
}
}
* You can't do what you want to the process if:
* (1) It's not being traced at all,
*/
- if (!ISSET(t->p_flag, P_TRACED))
- return (EPERM);
+ proc_lock(t);
+ if (!ISSET(t->p_lflag, P_LTRACED)) {
+ proc_unlock(t);
+ error = EPERM;
+ goto out;
+ }
/*
* (2) it's not being traced by _you_, or
*/
- if (t->p_pptr != p)
- return (EBUSY);
+ if (t->p_pptr != p) {
+ proc_unlock(t);
+ error = EBUSY;
+ goto out;
+ }
/*
* (3) it's not currently stopped.
*/
- if (t->p_stat != SSTOP)
- return (EBUSY);
+ if (t->p_stat != SSTOP) {
+ proc_unlock(t);
+ error = EBUSY;
+ goto out;
+ }
/*
* Mach version of ptrace executes request directly here,
* thus simplifying the interaction of ptrace and signals.
*/
+ /* proc lock is held here */
switch (uap->req) {
case PT_DETACH:
- if (t->p_oppid != t->p_pptr->p_pid) {
+ if (t->p_oppid != t->p_ppid) {
struct proc *pp;
- pp = pfind(t->p_oppid);
- proc_reparent(t, pp ? pp : initproc);
+ proc_unlock(t);
+ pp = proc_find(t->p_oppid);
+ if (pp != PROC_NULL) {
+ proc_reparentlocked(t, pp, 1, 0);
+ proc_rele(pp);
+ } else {
+ /* original parent exited while traced */
+ proc_list_lock();
+ t->p_listflag |= P_LIST_DEADPARENT;
+ proc_list_unlock();
+ proc_reparentlocked(t, initproc, 1, 0);
+ }
+ proc_lock(t);
}
t->p_oppid = 0;
- CLR(t->p_flag, P_TRACED);
- CLR(t->p_flag, P_SIGEXC);
+ CLR(t->p_lflag, P_LTRACED);
+ CLR(t->p_lflag, P_LSIGEXC);
+ proc_unlock(t);
goto resume;
case PT_KILL:
* Tell child process to kill itself after it
* is resumed by adding NSIG to p_cursig. [see issig]
*/
- psignal_lock(t, SIGKILL, 0);
+ proc_unlock(t);
+#if CONFIG_MACF
+ error = mac_proc_check_signal(p, t, SIGKILL);
+ if (0 != error)
+ goto resume;
+#endif
+ psignal(t, SIGKILL);
goto resume;
case PT_STEP: /* single step the child */
case PT_CONTINUE: /* continue the child */
+ proc_unlock(t);
th_act = (thread_t)get_firstthread(task);
- if (th_act == THREAD_NULL)
- goto errorLabel;
+ if (th_act == THREAD_NULL) {
+ error = EINVAL;
+ goto out;
+ }
+ /* force use of Mach SPIs (and task_for_pid security checks) to adjust PC */
if (uap->addr != (user_addr_t)1) {
-#if defined(ppc)
-#define ALIGNED(addr,size) (((unsigned)(addr)&((size)-1))==0)
- if (!ALIGNED((int)uap->addr, sizeof(int)))
- return (ERESTART);
-#undef ALIGNED
-#endif
- thread_setentrypoint(th_act, uap->addr);
+ error = ENOTSUP;
+ goto out;
}
- if ((unsigned)uap->data >= NSIG)
- goto errorLabel;
+ if ((unsigned)uap->data >= NSIG) {
+ error = EINVAL;
+ goto out;
+ }
if (uap->data != 0) {
- psignal_lock(t, uap->data, 0);
- }
+#if CONFIG_MACF
+ error = mac_proc_check_signal(p, t, uap->data);
+ if (0 != error)
+ goto out;
+#endif
+ psignal(t, uap->data);
+ }
if (uap->req == PT_STEP) {
/*
- * set trace bit
+ * set trace bit
+ * we use sending SIGSTOP as a comparable security check.
*/
- thread_setsinglestep(th_act, 1);
+#if CONFIG_MACF
+ error = mac_proc_check_signal(p, t, SIGSTOP);
+ if (0 != error) {
+ goto out;
+ }
+#endif
+ if (thread_setsinglestep(th_act, 1) != KERN_SUCCESS) {
+ error = ENOTSUP;
+ goto out;
+ }
} else {
/*
* clear trace bit if on
+ * we use sending SIGCONT as a comparable security check.
*/
- thread_setsinglestep(th_act, 0);
- }
+#if CONFIG_MACF
+ error = mac_proc_check_signal(p, t, SIGCONT);
+ if (0 != error) {
+ goto out;
+ }
+#endif
+ if (thread_setsinglestep(th_act, 0) != KERN_SUCCESS) {
+ error = ENOTSUP;
+ goto out;
+ }
+ }
resume:
+ proc_lock(t);
t->p_xstat = uap->data;
t->p_stat = SRUN;
if (t->sigwait) {
wakeup((caddr_t)&(t->sigwait));
- if ((t->p_flag & P_SIGEXC) == 0)
- task_release(task);
- }
+ proc_unlock(t);
+ if ((t->p_lflag & P_LSIGEXC) == 0) {
+ task_resume(task);
+ }
+ } else
+ proc_unlock(t);
+
break;
case PT_THUPDATE: {
- if ((unsigned)uap->data >= NSIG)
- goto errorLabel;
- th_act = port_name_to_thread(CAST_DOWN(mach_port_name_t, uap->addr));
- if (th_act == THREAD_NULL)
- return (ESRCH);
+ proc_unlock(t);
+ if ((unsigned)uap->data >= NSIG) {
+ error = EINVAL;
+ goto out;
+ }
+ th_act = port_name_to_thread(CAST_MACH_PORT_TO_NAME(uap->addr));
+ if (th_act == THREAD_NULL) {
+ error = ESRCH;
+ goto out;
+ }
ut = (uthread_t)get_bsdthread_info(th_act);
if (uap->data)
ut->uu_siglist |= sigmask(uap->data);
+ proc_lock(t);
t->p_xstat = uap->data;
t->p_stat = SRUN;
+ proc_unlock(t);
thread_deallocate(th_act);
- return(0);
+ error = 0;
}
break;
-errorLabel:
default:
- return(EINVAL);
+ proc_unlock(t);
+ error = EINVAL;
+ goto out;
}
- return(0);
+ error = 0;
+out:
+ proc_rele(t);
+ return(error);
}
/*
* (2) it's already being traced, or
*/
- if (ISSET(traced_procp->p_flag, P_TRACED)) {
+ if (ISSET(traced_procp->p_lflag, P_LTRACED)) {
*errp = EBUSY;
return (0);
}
* (3) it's not owned by you, or is set-id on exec
* (unless you're root).
*/
- if ((creds->cr_ruid != proc_ucred(traced_procp)->cr_ruid ||
+ if ((kauth_cred_getruid(creds) != kauth_cred_getruid(proc_ucred(traced_procp)) ||
ISSET(traced_procp->p_flag, P_SUGID)) &&
(my_err = suser(creds, &cur_procp->p_acflag)) != 0) {
*errp = my_err;
return (0);
}
- if ((cur_procp->p_flag & P_TRACED) && isinferior(cur_procp, traced_procp)) {
+ if ((cur_procp->p_lflag & P_LTRACED) && isinferior(cur_procp, traced_procp)) {
*errp = EPERM;
return (0);
}
- if (ISSET(traced_procp->p_flag, P_NOATTACH)) {
+ if (ISSET(traced_procp->p_lflag, P_LNOATTACH)) {
*errp = EBUSY;
return (0);
}
+
+#if CONFIG_MACF
+ if ((my_err = mac_proc_check_debug(cur_procp, traced_procp)) != 0) {
+ *errp = my_err;
+ return (0);
+ }
+#endif
+
return(1);
}
projects / apple / xnu.git / blobdiff