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- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/exec.h>
- #include <sys/proc.h>
- #include <sys/signalvar.h>
- #include <sys/errno.h>
- #include <sys/malloc.h>
- #include <sys/ptrace.h>
- #include <sys/uio.h>
- #include <sys/sched.h>
- #include <sys/mount.h>
- #include <sys/syscallargs.h>
- #include <uvm/uvm_extern.h>
- #include <machine/reg.h>
- int process_auxv_offset(struct proc *, struct proc *, struct uio *);
- #ifdef PTRACE
- int global_ptrace;
- int
- sys_ptrace(struct proc *p, void *v, register_t *retval)
- {
- struct sys_ptrace_args
- *uap = v;
- struct proc *t;
- struct process *tr;
- struct uio uio;
- struct iovec iov;
- struct ptrace_io_desc piod;
- struct ptrace_event pe;
- struct ptrace_thread_state pts;
- struct reg *regs;
- #if defined (PT_SETFPREGS) || defined (PT_GETFPREGS)
- struct fpreg *fpregs;
- #endif
- #if defined (PT_SETXMMREGS) || defined (PT_GETXMMREGS)
- struct xmmregs *xmmregs;
- #endif
- #ifdef PT_WCOOKIE
- register_t wcookie;
- #endif
- int error, write;
- int temp;
- int req = SCARG(uap, req);
- int s;
-
- switch (req) {
- case PT_TRACE_ME:
- t = p;
- break;
-
- case PT_READ_I:
- case PT_READ_D:
- case PT_WRITE_I:
- case PT_WRITE_D:
- case PT_KILL:
- case PT_ATTACH:
- case PT_IO:
- case PT_SET_EVENT_MASK:
- case PT_GET_EVENT_MASK:
- case PT_GET_PROCESS_STATE:
- case PT_GET_THREAD_FIRST:
- case PT_GET_THREAD_NEXT:
- default:
-
- if ((t = pfind(SCARG(uap, pid))) == NULL)
- return (ESRCH);
- if (t->p_flag & P_THREAD)
- return (ESRCH);
- break;
-
- case PT_CONTINUE:
- case PT_DETACH:
- #ifdef PT_STEP
- case PT_STEP:
- #endif
- case PT_GETREGS:
- case PT_SETREGS:
- #ifdef PT_GETFPREGS
- case PT_GETFPREGS:
- #endif
- #ifdef PT_SETFPREGS
- case PT_SETFPREGS:
- #endif
- #ifdef PT_GETXMMREGS
- case PT_GETXMMREGS:
- #endif
- #ifdef PT_SETXMMREGS
- case PT_SETXMMREGS:
- #endif
- if (SCARG(uap, pid) > THREAD_PID_OFFSET) {
- t = pfind(SCARG(uap, pid) - THREAD_PID_OFFSET);
- if (t == NULL)
- return (ESRCH);
- } else {
- if ((t = pfind(SCARG(uap, pid))) == NULL)
- return (ESRCH);
- if (t->p_flag & P_THREAD)
- return (ESRCH);
- }
- break;
- }
- tr = t->p_p;
- if ((tr->ps_flags & PS_INEXEC) != 0)
- return (EAGAIN);
-
- switch (req) {
- case PT_TRACE_ME:
-
- break;
- case PT_ATTACH:
-
- if (tr == p->p_p)
- return (EINVAL);
-
- if (ISSET(tr->ps_flags, PS_SYSTEM))
- return (EPERM);
-
- if (ISSET(tr->ps_flags, PS_TRACED))
- return (EBUSY);
-
- if ((tr->ps_ucred->cr_ruid != p->p_ucred->cr_ruid ||
- ISSET(tr->ps_flags, PS_SUGIDEXEC | PS_SUGID)) &&
- (error = suser(p, 0)) != 0)
- return (error);
-
- if (global_ptrace == 0 && !inferior(tr, p->p_p) &&
- (error = suser(p, 0)) != 0)
- return (error);
-
- if ((tr->ps_pid == 1) && (securelevel > -1))
- return (EPERM);
-
- if (tr->ps_pid != 1 && inferior(p->p_p, tr))
- return (EINVAL);
- break;
- case PT_READ_I:
- case PT_READ_D:
- case PT_WRITE_I:
- case PT_WRITE_D:
- case PT_IO:
- case PT_CONTINUE:
- case PT_KILL:
- case PT_DETACH:
- #ifdef PT_STEP
- case PT_STEP:
- #endif
- case PT_SET_EVENT_MASK:
- case PT_GET_EVENT_MASK:
- case PT_GET_PROCESS_STATE:
- case PT_GETREGS:
- case PT_SETREGS:
- #ifdef PT_GETFPREGS
- case PT_GETFPREGS:
- #endif
- #ifdef PT_SETFPREGS
- case PT_SETFPREGS:
- #endif
- #ifdef PT_GETXMMREGS
- case PT_GETXMMREGS:
- #endif
- #ifdef PT_SETXMMREGS
- case PT_SETXMMREGS:
- #endif
- #ifdef PT_WCOOKIE
- case PT_WCOOKIE:
- #endif
-
- if (!ISSET(tr->ps_flags, PS_TRACED))
- return (EPERM);
-
- if (tr->ps_pptr != p->p_p)
- return (EBUSY);
-
- if (t->p_stat != SSTOP || !ISSET(tr->ps_flags, PS_WAITED))
- return (EBUSY);
- break;
- case PT_GET_THREAD_FIRST:
- case PT_GET_THREAD_NEXT:
-
- if (!ISSET(tr->ps_flags, PS_TRACED))
- return (EPERM);
-
- if (tr->ps_pptr != p->p_p)
- return (EBUSY);
-
- if (SCARG(uap, data) != sizeof(pts))
- return (EINVAL);
- if (req == PT_GET_THREAD_NEXT) {
- error = copyin(SCARG(uap, addr), &pts, sizeof(pts));
- if (error)
- return (error);
- t = pfind(pts.pts_tid - THREAD_PID_OFFSET);
- if (t == NULL || ISSET(t->p_flag, P_WEXIT))
- return (ESRCH);
- if (t->p_p != tr)
- return (EINVAL);
- t = TAILQ_NEXT(t, p_thr_link);
- } else {
- t = TAILQ_FIRST(&tr->ps_threads);
- }
- if (t == NULL)
- pts.pts_tid = -1;
- else
- pts.pts_tid = t->p_pid + THREAD_PID_OFFSET;
- return (copyout(&pts, SCARG(uap, addr), sizeof(pts)));
- default:
- return (EINVAL);
- }
-
- FIX_SSTEP(t);
-
- write = 0;
- *retval = 0;
- switch (req) {
- case PT_TRACE_ME:
-
- atomic_setbits_int(&tr->ps_flags, PS_TRACED);
- tr->ps_oppid = tr->ps_pptr->ps_pid;
- if (tr->ps_ptstat == NULL)
- tr->ps_ptstat = malloc(sizeof(*tr->ps_ptstat),
- M_SUBPROC, M_WAITOK);
- memset(tr->ps_ptstat, 0, sizeof(*tr->ps_ptstat));
- return (0);
- case PT_WRITE_I:
- case PT_WRITE_D:
- write = 1;
- temp = SCARG(uap, data);
- case PT_READ_I:
- case PT_READ_D:
-
- iov.iov_base = (caddr_t)&temp;
- iov.iov_len = sizeof(int);
- uio.uio_iov = &iov;
- uio.uio_iovcnt = 1;
- uio.uio_offset = (off_t)(vaddr_t)SCARG(uap, addr);
- uio.uio_resid = sizeof(int);
- uio.uio_segflg = UIO_SYSSPACE;
- uio.uio_rw = write ? UIO_WRITE : UIO_READ;
- uio.uio_procp = p;
- error = process_domem(p, t, &uio, write ? PT_WRITE_I :
- PT_READ_I);
- if (write == 0)
- *retval = temp;
- return (error);
- case PT_IO:
- error = copyin(SCARG(uap, addr), &piod, sizeof(piod));
- if (error)
- return (error);
- iov.iov_base = piod.piod_addr;
- iov.iov_len = piod.piod_len;
- uio.uio_iov = &iov;
- uio.uio_iovcnt = 1;
- uio.uio_offset = (off_t)(vaddr_t)piod.piod_offs;
- uio.uio_resid = piod.piod_len;
- uio.uio_segflg = UIO_USERSPACE;
- uio.uio_procp = p;
- switch (piod.piod_op) {
- case PIOD_READ_I:
- req = PT_READ_I;
- uio.uio_rw = UIO_READ;
- break;
- case PIOD_READ_D:
- req = PT_READ_D;
- uio.uio_rw = UIO_READ;
- break;
- case PIOD_WRITE_I:
- req = PT_WRITE_I;
- uio.uio_rw = UIO_WRITE;
- break;
- case PIOD_WRITE_D:
- req = PT_WRITE_D;
- uio.uio_rw = UIO_WRITE;
- break;
- case PIOD_READ_AUXV:
- req = PT_READ_D;
- uio.uio_rw = UIO_READ;
- temp = tr->ps_emul->e_arglen * sizeof(char *);
- if (uio.uio_offset > temp)
- return (EIO);
- if (uio.uio_resid > temp - uio.uio_offset)
- uio.uio_resid = temp - uio.uio_offset;
- piod.piod_len = iov.iov_len = uio.uio_resid;
- error = process_auxv_offset(p, t, &uio);
- if (error)
- return (error);
- break;
- default:
- return (EINVAL);
- }
- error = process_domem(p, t, &uio, req);
- piod.piod_len -= uio.uio_resid;
- (void) copyout(&piod, SCARG(uap, addr), sizeof(piod));
- return (error);
- #ifdef PT_STEP
- case PT_STEP:
-
- #endif
- case PT_CONTINUE:
-
- if (SCARG(uap, pid) < THREAD_PID_OFFSET && tr->ps_single)
- t = tr->ps_single;
-
- if (SCARG(uap, data) < 0 || SCARG(uap, data) >= NSIG)
- return (EINVAL);
-
- if ((int *)SCARG(uap, addr) != (int *)1)
- if ((error = process_set_pc(t, SCARG(uap, addr))) != 0)
- goto relebad;
- #ifdef PT_STEP
-
- error = process_sstep(t, req == PT_STEP);
- if (error)
- goto relebad;
- #endif
- goto sendsig;
- case PT_DETACH:
-
- if (SCARG(uap, pid) < THREAD_PID_OFFSET && tr->ps_single)
- t = tr->ps_single;
-
- if (SCARG(uap, data) < 0 || SCARG(uap, data) >= NSIG)
- return (EINVAL);
- #ifdef PT_STEP
-
- error = process_sstep(t, req == PT_STEP);
- if (error)
- goto relebad;
- #endif
-
- if (tr->ps_oppid != tr->ps_pptr->ps_pid) {
- struct process *ppr;
- ppr = prfind(tr->ps_oppid);
- proc_reparent(tr, ppr ? ppr : initprocess);
- }
-
- tr->ps_oppid = 0;
- atomic_clearbits_int(&tr->ps_flags, PS_TRACED|PS_WAITED);
- sendsig:
- memset(tr->ps_ptstat, 0, sizeof(*tr->ps_ptstat));
-
- if (t->p_stat == SSTOP) {
- t->p_xstat = SCARG(uap, data);
- SCHED_LOCK(s);
- setrunnable(t);
- SCHED_UNLOCK(s);
- } else {
- if (SCARG(uap, data) != 0)
- psignal(t, SCARG(uap, data));
- }
- return (0);
- relebad:
- return (error);
- case PT_KILL:
- if (SCARG(uap, pid) < THREAD_PID_OFFSET && tr->ps_single)
- t = tr->ps_single;
-
- SCARG(uap, data) = SIGKILL;
- goto sendsig;
- case PT_ATTACH:
-
- atomic_setbits_int(&tr->ps_flags, PS_TRACED);
- tr->ps_oppid = tr->ps_pptr->ps_pid;
- if (tr->ps_pptr != p->p_p)
- proc_reparent(tr, p->p_p);
- if (tr->ps_ptstat == NULL)
- tr->ps_ptstat = malloc(sizeof(*tr->ps_ptstat),
- M_SUBPROC, M_WAITOK);
- SCARG(uap, data) = SIGSTOP;
- goto sendsig;
- case PT_GET_EVENT_MASK:
- if (SCARG(uap, data) != sizeof(pe))
- return (EINVAL);
- memset(&pe, 0, sizeof(pe));
- pe.pe_set_event = tr->ps_ptmask;
- return (copyout(&pe, SCARG(uap, addr), sizeof(pe)));
- case PT_SET_EVENT_MASK:
- if (SCARG(uap, data) != sizeof(pe))
- return (EINVAL);
- if ((error = copyin(SCARG(uap, addr), &pe, sizeof(pe))))
- return (error);
- tr->ps_ptmask = pe.pe_set_event;
- return (0);
- case PT_GET_PROCESS_STATE:
- if (SCARG(uap, data) != sizeof(*tr->ps_ptstat))
- return (EINVAL);
- if (tr->ps_single)
- tr->ps_ptstat->pe_tid =
- tr->ps_single->p_pid + THREAD_PID_OFFSET;
- return (copyout(tr->ps_ptstat, SCARG(uap, addr),
- sizeof(*tr->ps_ptstat)));
- case PT_SETREGS:
- KASSERT((p->p_flag & P_SYSTEM) == 0);
- if ((error = process_checkioperm(p, tr)) != 0)
- return (error);
- regs = malloc(sizeof(*regs), M_TEMP, M_WAITOK);
- error = copyin(SCARG(uap, addr), regs, sizeof(*regs));
- if (error == 0) {
- error = process_write_regs(t, regs);
- }
- free(regs, M_TEMP, sizeof(*regs));
- return (error);
- case PT_GETREGS:
- KASSERT((p->p_flag & P_SYSTEM) == 0);
- if ((error = process_checkioperm(p, tr)) != 0)
- return (error);
- regs = malloc(sizeof(*regs), M_TEMP, M_WAITOK);
- error = process_read_regs(t, regs);
- if (error == 0)
- error = copyout(regs,
- SCARG(uap, addr), sizeof (*regs));
- free(regs, M_TEMP, sizeof(*regs));
- return (error);
- #ifdef PT_SETFPREGS
- case PT_SETFPREGS:
- KASSERT((p->p_flag & P_SYSTEM) == 0);
- if ((error = process_checkioperm(p, tr)) != 0)
- return (error);
- fpregs = malloc(sizeof(*fpregs), M_TEMP, M_WAITOK);
- error = copyin(SCARG(uap, addr), fpregs, sizeof(*fpregs));
- if (error == 0) {
- error = process_write_fpregs(t, fpregs);
- }
- free(fpregs, M_TEMP, sizeof(*fpregs));
- return (error);
- #endif
- #ifdef PT_GETFPREGS
- case PT_GETFPREGS:
- KASSERT((p->p_flag & P_SYSTEM) == 0);
- if ((error = process_checkioperm(p, tr)) != 0)
- return (error);
- fpregs = malloc(sizeof(*fpregs), M_TEMP, M_WAITOK);
- error = process_read_fpregs(t, fpregs);
- if (error == 0)
- error = copyout(fpregs,
- SCARG(uap, addr), sizeof(*fpregs));
- free(fpregs, M_TEMP, sizeof(*fpregs));
- return (error);
- #endif
- #ifdef PT_SETXMMREGS
- case PT_SETXMMREGS:
- KASSERT((p->p_flag & P_SYSTEM) == 0);
- if ((error = process_checkioperm(p, tr)) != 0)
- return (error);
- xmmregs = malloc(sizeof(*xmmregs), M_TEMP, M_WAITOK);
- error = copyin(SCARG(uap, addr), xmmregs, sizeof(*xmmregs));
- if (error == 0) {
- error = process_write_xmmregs(t, xmmregs);
- }
- free(xmmregs, M_TEMP, sizeof(*xmmregs));
- return (error);
- #endif
- #ifdef PT_GETXMMREGS
- case PT_GETXMMREGS:
- KASSERT((p->p_flag & P_SYSTEM) == 0);
- if ((error = process_checkioperm(p, tr)) != 0)
- return (error);
- xmmregs = malloc(sizeof(*xmmregs), M_TEMP, M_WAITOK);
- error = process_read_xmmregs(t, xmmregs);
- if (error == 0)
- error = copyout(xmmregs,
- SCARG(uap, addr), sizeof(*xmmregs));
- free(xmmregs, M_TEMP, sizeof(*xmmregs));
- return (error);
- #endif
- #ifdef PT_WCOOKIE
- case PT_WCOOKIE:
- wcookie = process_get_wcookie (t);
- return (copyout(&wcookie, SCARG(uap, addr),
- sizeof (register_t)));
- #endif
- }
- #ifdef DIAGNOSTIC
- panic("ptrace: impossible");
- #endif
- return 0;
- }
- #endif
- int
- process_checkioperm(struct proc *p, struct process *tr)
- {
- int error;
- if ((tr->ps_ucred->cr_ruid != p->p_ucred->cr_ruid ||
- ISSET(tr->ps_flags, PS_SUGIDEXEC | PS_SUGID)) &&
- (error = suser(p, 0)) != 0)
- return (error);
- if ((tr->ps_pid == 1) && (securelevel > -1))
- return (EPERM);
- if (tr->ps_flags & PS_INEXEC)
- return (EAGAIN);
- return (0);
- }
- int
- process_domem(struct proc *curp, struct proc *p, struct uio *uio, int req)
- {
- struct vmspace *vm;
- int error;
- vaddr_t addr;
- vsize_t len;
- len = uio->uio_resid;
- if (len == 0)
- return (0);
- if ((error = process_checkioperm(curp, p->p_p)) != 0)
- return (error);
-
- if ((p->p_p->ps_flags & PS_EXITING) || (p->p_vmspace->vm_refcnt < 1))
- return(EFAULT);
- addr = uio->uio_offset;
- vm = p->p_vmspace;
- vm->vm_refcnt++;
- error = uvm_io(&vm->vm_map, uio,
- (req == PT_WRITE_I) ? UVM_IO_FIXPROT : 0);
- uvmspace_free(vm);
- if (error == 0 && req == PT_WRITE_I)
- pmap_proc_iflush(p, addr, len);
- return (error);
- }
- #ifdef PTRACE
- int
- process_auxv_offset(struct proc *curp, struct proc *p, struct uio *uiop)
- {
- struct process *pr = p->p_p;
- struct ps_strings pss;
- struct iovec iov;
- struct uio uio;
- int error;
- iov.iov_base = &pss;
- iov.iov_len = sizeof(pss);
- uio.uio_iov = &iov;
- uio.uio_iovcnt = 1;
- uio.uio_offset = (off_t)pr->ps_strings;
- uio.uio_resid = sizeof(pss);
- uio.uio_segflg = UIO_SYSSPACE;
- uio.uio_rw = UIO_READ;
- uio.uio_procp = curp;
- if ((error = uvm_io(&p->p_vmspace->vm_map, &uio, 0)) != 0)
- return (error);
- if (pss.ps_envstr == NULL)
- return (EIO);
- uiop->uio_offset += (off_t)(vaddr_t)(pss.ps_envstr + pss.ps_nenvstr + 1);
- #ifdef MACHINE_STACK_GROWS_UP
- if (uiop->uio_offset < (off_t)pr->ps_strings)
- return (EIO);
- #else
- if (uiop->uio_offset > (off_t)pr->ps_strings)
- return (EIO);
- if ((uiop->uio_offset + uiop->uio_resid) > (off_t)pr->ps_strings)
- uiop->uio_resid = (off_t)pr->ps_strings - uiop->uio_offset;
- #endif
- return (0);
- }
- #endif
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