c014fd46ec
the orphaned descendants. Base of the API is modelled after the same feature from the DragonFlyBSD. Requested by: bapt Reviewed by: jilles (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 3 weeks
1236 lines
27 KiB
C
1236 lines
27 KiB
C
/*-
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* Copyright (c) 1994, Sean Eric Fagan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Sean Eric Fagan.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/ptrace.h>
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#include <sys/rwlock.h>
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#include <sys/sx.h>
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#include <sys/malloc.h>
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#include <sys/signalvar.h>
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#include <machine/reg.h>
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#include <security/audit/audit.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_param.h>
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#ifdef COMPAT_FREEBSD32
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#include <sys/procfs.h>
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#include <compat/freebsd32/freebsd32_signal.h>
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struct ptrace_io_desc32 {
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int piod_op;
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uint32_t piod_offs;
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uint32_t piod_addr;
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uint32_t piod_len;
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};
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struct ptrace_vm_entry32 {
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int pve_entry;
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int pve_timestamp;
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uint32_t pve_start;
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uint32_t pve_end;
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uint32_t pve_offset;
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u_int pve_prot;
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u_int pve_pathlen;
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int32_t pve_fileid;
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u_int pve_fsid;
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uint32_t pve_path;
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};
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struct ptrace_lwpinfo32 {
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lwpid_t pl_lwpid; /* LWP described. */
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int pl_event; /* Event that stopped the LWP. */
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int pl_flags; /* LWP flags. */
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sigset_t pl_sigmask; /* LWP signal mask */
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sigset_t pl_siglist; /* LWP pending signal */
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struct siginfo32 pl_siginfo; /* siginfo for signal */
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char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
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int pl_child_pid; /* New child pid */
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};
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#endif
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/*
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* Functions implemented using PROC_ACTION():
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*
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* proc_read_regs(proc, regs)
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* Get the current user-visible register set from the process
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* and copy it into the regs structure (<machine/reg.h>).
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* The process is stopped at the time read_regs is called.
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*
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* proc_write_regs(proc, regs)
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* Update the current register set from the passed in regs
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* structure. Take care to avoid clobbering special CPU
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* registers or privileged bits in the PSL.
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* Depending on the architecture this may have fix-up work to do,
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* especially if the IAR or PCW are modified.
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* The process is stopped at the time write_regs is called.
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*
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* proc_read_fpregs, proc_write_fpregs
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* deal with the floating point register set, otherwise as above.
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*
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* proc_read_dbregs, proc_write_dbregs
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* deal with the processor debug register set, otherwise as above.
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*
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* proc_sstep(proc)
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* Arrange for the process to trap after executing a single instruction.
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*/
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#define PROC_ACTION(action) do { \
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int error; \
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\
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PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
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if ((td->td_proc->p_flag & P_INMEM) == 0) \
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error = EIO; \
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else \
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error = (action); \
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return (error); \
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} while(0)
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int
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proc_read_regs(struct thread *td, struct reg *regs)
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{
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PROC_ACTION(fill_regs(td, regs));
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}
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int
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proc_write_regs(struct thread *td, struct reg *regs)
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{
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PROC_ACTION(set_regs(td, regs));
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}
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int
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proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
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{
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PROC_ACTION(fill_dbregs(td, dbregs));
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}
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int
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proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
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{
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PROC_ACTION(set_dbregs(td, dbregs));
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}
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/*
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* Ptrace doesn't support fpregs at all, and there are no security holes
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* or translations for fpregs, so we can just copy them.
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*/
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int
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proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
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{
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PROC_ACTION(fill_fpregs(td, fpregs));
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}
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int
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proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
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{
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PROC_ACTION(set_fpregs(td, fpregs));
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}
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#ifdef COMPAT_FREEBSD32
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/* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
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int
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proc_read_regs32(struct thread *td, struct reg32 *regs32)
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{
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PROC_ACTION(fill_regs32(td, regs32));
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}
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int
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proc_write_regs32(struct thread *td, struct reg32 *regs32)
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{
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PROC_ACTION(set_regs32(td, regs32));
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}
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int
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proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
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{
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PROC_ACTION(fill_dbregs32(td, dbregs32));
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}
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int
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proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
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{
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PROC_ACTION(set_dbregs32(td, dbregs32));
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}
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int
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proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
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{
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PROC_ACTION(fill_fpregs32(td, fpregs32));
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}
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int
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proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
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{
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PROC_ACTION(set_fpregs32(td, fpregs32));
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}
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#endif
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int
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proc_sstep(struct thread *td)
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{
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PROC_ACTION(ptrace_single_step(td));
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}
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int
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proc_rwmem(struct proc *p, struct uio *uio)
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{
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vm_map_t map;
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vm_offset_t pageno; /* page number */
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vm_prot_t reqprot;
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int error, fault_flags, page_offset, writing;
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/*
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* Assert that someone has locked this vmspace. (Should be
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* curthread but we can't assert that.) This keeps the process
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* from exiting out from under us until this operation completes.
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*/
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KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
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p, p->p_pid));
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/*
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* The map we want...
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*/
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map = &p->p_vmspace->vm_map;
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/*
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* If we are writing, then we request vm_fault() to create a private
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* copy of each page. Since these copies will not be writeable by the
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* process, we must explicity request that they be dirtied.
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*/
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writing = uio->uio_rw == UIO_WRITE;
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reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
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fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
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/*
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* Only map in one page at a time. We don't have to, but it
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* makes things easier. This way is trivial - right?
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*/
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do {
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vm_offset_t uva;
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u_int len;
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vm_page_t m;
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uva = (vm_offset_t)uio->uio_offset;
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/*
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* Get the page number of this segment.
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*/
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pageno = trunc_page(uva);
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page_offset = uva - pageno;
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/*
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* How many bytes to copy
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*/
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len = min(PAGE_SIZE - page_offset, uio->uio_resid);
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/*
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* Fault and hold the page on behalf of the process.
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*/
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error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
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if (error != KERN_SUCCESS) {
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if (error == KERN_RESOURCE_SHORTAGE)
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error = ENOMEM;
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else
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error = EFAULT;
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break;
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}
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/*
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* Now do the i/o move.
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*/
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error = uiomove_fromphys(&m, page_offset, len, uio);
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/* Make the I-cache coherent for breakpoints. */
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if (writing && error == 0) {
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vm_map_lock_read(map);
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if (vm_map_check_protection(map, pageno, pageno +
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PAGE_SIZE, VM_PROT_EXECUTE))
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vm_sync_icache(map, uva, len);
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vm_map_unlock_read(map);
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}
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/*
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* Release the page.
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*/
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vm_page_lock(m);
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vm_page_unhold(m);
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vm_page_unlock(m);
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} while (error == 0 && uio->uio_resid > 0);
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return (error);
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}
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static int
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ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
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{
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struct vattr vattr;
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vm_map_t map;
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vm_map_entry_t entry;
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vm_object_t obj, tobj, lobj;
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struct vmspace *vm;
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struct vnode *vp;
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char *freepath, *fullpath;
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u_int pathlen;
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int error, index;
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error = 0;
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obj = NULL;
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vm = vmspace_acquire_ref(p);
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map = &vm->vm_map;
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vm_map_lock_read(map);
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do {
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entry = map->header.next;
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index = 0;
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while (index < pve->pve_entry && entry != &map->header) {
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entry = entry->next;
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index++;
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}
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if (index != pve->pve_entry) {
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error = EINVAL;
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break;
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}
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while (entry != &map->header &&
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(entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
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entry = entry->next;
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index++;
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}
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if (entry == &map->header) {
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error = ENOENT;
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break;
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}
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/* We got an entry. */
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pve->pve_entry = index + 1;
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pve->pve_timestamp = map->timestamp;
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pve->pve_start = entry->start;
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pve->pve_end = entry->end - 1;
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pve->pve_offset = entry->offset;
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pve->pve_prot = entry->protection;
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/* Backing object's path needed? */
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if (pve->pve_pathlen == 0)
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break;
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pathlen = pve->pve_pathlen;
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pve->pve_pathlen = 0;
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obj = entry->object.vm_object;
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if (obj != NULL)
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VM_OBJECT_RLOCK(obj);
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} while (0);
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vm_map_unlock_read(map);
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vmspace_free(vm);
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pve->pve_fsid = VNOVAL;
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pve->pve_fileid = VNOVAL;
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if (error == 0 && obj != NULL) {
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lobj = obj;
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for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
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if (tobj != obj)
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VM_OBJECT_RLOCK(tobj);
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if (lobj != obj)
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VM_OBJECT_RUNLOCK(lobj);
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lobj = tobj;
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pve->pve_offset += tobj->backing_object_offset;
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}
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vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL;
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if (vp != NULL)
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vref(vp);
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if (lobj != obj)
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VM_OBJECT_RUNLOCK(lobj);
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VM_OBJECT_RUNLOCK(obj);
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if (vp != NULL) {
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freepath = NULL;
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fullpath = NULL;
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vn_fullpath(td, vp, &fullpath, &freepath);
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vn_lock(vp, LK_SHARED | LK_RETRY);
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if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
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pve->pve_fileid = vattr.va_fileid;
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pve->pve_fsid = vattr.va_fsid;
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}
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vput(vp);
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if (fullpath != NULL) {
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pve->pve_pathlen = strlen(fullpath) + 1;
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if (pve->pve_pathlen <= pathlen) {
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error = copyout(fullpath, pve->pve_path,
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pve->pve_pathlen);
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} else
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error = ENAMETOOLONG;
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}
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if (freepath != NULL)
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free(freepath, M_TEMP);
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}
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}
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return (error);
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}
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#ifdef COMPAT_FREEBSD32
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static int
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ptrace_vm_entry32(struct thread *td, struct proc *p,
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struct ptrace_vm_entry32 *pve32)
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{
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struct ptrace_vm_entry pve;
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int error;
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pve.pve_entry = pve32->pve_entry;
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pve.pve_pathlen = pve32->pve_pathlen;
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pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
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error = ptrace_vm_entry(td, p, &pve);
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if (error == 0) {
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pve32->pve_entry = pve.pve_entry;
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pve32->pve_timestamp = pve.pve_timestamp;
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pve32->pve_start = pve.pve_start;
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pve32->pve_end = pve.pve_end;
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pve32->pve_offset = pve.pve_offset;
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pve32->pve_prot = pve.pve_prot;
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pve32->pve_fileid = pve.pve_fileid;
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pve32->pve_fsid = pve.pve_fsid;
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}
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pve32->pve_pathlen = pve.pve_pathlen;
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return (error);
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}
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static void
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ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
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struct ptrace_lwpinfo32 *pl32)
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{
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pl32->pl_lwpid = pl->pl_lwpid;
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pl32->pl_event = pl->pl_event;
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pl32->pl_flags = pl->pl_flags;
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pl32->pl_sigmask = pl->pl_sigmask;
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pl32->pl_siglist = pl->pl_siglist;
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siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
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strcpy(pl32->pl_tdname, pl->pl_tdname);
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pl32->pl_child_pid = pl->pl_child_pid;
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}
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#endif /* COMPAT_FREEBSD32 */
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/*
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* Process debugging system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct ptrace_args {
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int req;
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pid_t pid;
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caddr_t addr;
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int data;
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};
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#endif
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|
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#ifdef COMPAT_FREEBSD32
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/*
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* This CPP subterfuge is to try and reduce the number of ifdefs in
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* the body of the code.
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* COPYIN(uap->addr, &r.reg, sizeof r.reg);
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* becomes either:
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* copyin(uap->addr, &r.reg, sizeof r.reg);
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* or
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* copyin(uap->addr, &r.reg32, sizeof r.reg32);
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* .. except this is done at runtime.
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*/
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#define COPYIN(u, k, s) wrap32 ? \
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copyin(u, k ## 32, s ## 32) : \
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copyin(u, k, s)
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#define COPYOUT(k, u, s) wrap32 ? \
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copyout(k ## 32, u, s ## 32) : \
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copyout(k, u, s)
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#else
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#define COPYIN(u, k, s) copyin(u, k, s)
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#define COPYOUT(k, u, s) copyout(k, u, s)
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#endif
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int
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sys_ptrace(struct thread *td, struct ptrace_args *uap)
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{
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/*
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* XXX this obfuscation is to reduce stack usage, but the register
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* structs may be too large to put on the stack anyway.
|
|
*/
|
|
union {
|
|
struct ptrace_io_desc piod;
|
|
struct ptrace_lwpinfo pl;
|
|
struct ptrace_vm_entry pve;
|
|
struct dbreg dbreg;
|
|
struct fpreg fpreg;
|
|
struct reg reg;
|
|
#ifdef COMPAT_FREEBSD32
|
|
struct dbreg32 dbreg32;
|
|
struct fpreg32 fpreg32;
|
|
struct reg32 reg32;
|
|
struct ptrace_io_desc32 piod32;
|
|
struct ptrace_lwpinfo32 pl32;
|
|
struct ptrace_vm_entry32 pve32;
|
|
#endif
|
|
} r;
|
|
void *addr;
|
|
int error = 0;
|
|
#ifdef COMPAT_FREEBSD32
|
|
int wrap32 = 0;
|
|
|
|
if (SV_CURPROC_FLAG(SV_ILP32))
|
|
wrap32 = 1;
|
|
#endif
|
|
AUDIT_ARG_PID(uap->pid);
|
|
AUDIT_ARG_CMD(uap->req);
|
|
AUDIT_ARG_VALUE(uap->data);
|
|
addr = &r;
|
|
switch (uap->req) {
|
|
case PT_GETREGS:
|
|
case PT_GETFPREGS:
|
|
case PT_GETDBREGS:
|
|
case PT_LWPINFO:
|
|
break;
|
|
case PT_SETREGS:
|
|
error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
|
|
break;
|
|
case PT_SETFPREGS:
|
|
error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
|
|
break;
|
|
case PT_SETDBREGS:
|
|
error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
|
|
break;
|
|
case PT_IO:
|
|
error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
|
|
break;
|
|
case PT_VM_ENTRY:
|
|
error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
|
|
break;
|
|
default:
|
|
addr = uap->addr;
|
|
break;
|
|
}
|
|
if (error)
|
|
return (error);
|
|
|
|
error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (uap->req) {
|
|
case PT_VM_ENTRY:
|
|
error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
|
|
break;
|
|
case PT_IO:
|
|
error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
|
|
break;
|
|
case PT_GETREGS:
|
|
error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
|
|
break;
|
|
case PT_GETFPREGS:
|
|
error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
|
|
break;
|
|
case PT_GETDBREGS:
|
|
error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
|
|
break;
|
|
case PT_LWPINFO:
|
|
error = copyout(&r.pl, uap->addr, uap->data);
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#undef COPYIN
|
|
#undef COPYOUT
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
/*
|
|
* PROC_READ(regs, td2, addr);
|
|
* becomes either:
|
|
* proc_read_regs(td2, addr);
|
|
* or
|
|
* proc_read_regs32(td2, addr);
|
|
* .. except this is done at runtime. There is an additional
|
|
* complication in that PROC_WRITE disallows 32 bit consumers
|
|
* from writing to 64 bit address space targets.
|
|
*/
|
|
#define PROC_READ(w, t, a) wrap32 ? \
|
|
proc_read_ ## w ## 32(t, a) : \
|
|
proc_read_ ## w (t, a)
|
|
#define PROC_WRITE(w, t, a) wrap32 ? \
|
|
(safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
|
|
proc_write_ ## w (t, a)
|
|
#else
|
|
#define PROC_READ(w, t, a) proc_read_ ## w (t, a)
|
|
#define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
|
|
#endif
|
|
|
|
int
|
|
kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
|
|
{
|
|
struct iovec iov;
|
|
struct uio uio;
|
|
struct proc *curp, *p, *pp;
|
|
struct thread *td2 = NULL, *td3;
|
|
struct ptrace_io_desc *piod = NULL;
|
|
struct ptrace_lwpinfo *pl;
|
|
int error, write, tmp, num;
|
|
int proctree_locked = 0;
|
|
lwpid_t tid = 0, *buf;
|
|
#ifdef COMPAT_FREEBSD32
|
|
int wrap32 = 0, safe = 0;
|
|
struct ptrace_io_desc32 *piod32 = NULL;
|
|
struct ptrace_lwpinfo32 *pl32 = NULL;
|
|
struct ptrace_lwpinfo plr;
|
|
#endif
|
|
|
|
curp = td->td_proc;
|
|
|
|
/* Lock proctree before locking the process. */
|
|
switch (req) {
|
|
case PT_TRACE_ME:
|
|
case PT_ATTACH:
|
|
case PT_STEP:
|
|
case PT_CONTINUE:
|
|
case PT_TO_SCE:
|
|
case PT_TO_SCX:
|
|
case PT_SYSCALL:
|
|
case PT_FOLLOW_FORK:
|
|
case PT_DETACH:
|
|
sx_xlock(&proctree_lock);
|
|
proctree_locked = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
write = 0;
|
|
if (req == PT_TRACE_ME) {
|
|
p = td->td_proc;
|
|
PROC_LOCK(p);
|
|
} else {
|
|
if (pid <= PID_MAX) {
|
|
if ((p = pfind(pid)) == NULL) {
|
|
if (proctree_locked)
|
|
sx_xunlock(&proctree_lock);
|
|
return (ESRCH);
|
|
}
|
|
} else {
|
|
td2 = tdfind(pid, -1);
|
|
if (td2 == NULL) {
|
|
if (proctree_locked)
|
|
sx_xunlock(&proctree_lock);
|
|
return (ESRCH);
|
|
}
|
|
p = td2->td_proc;
|
|
tid = pid;
|
|
pid = p->p_pid;
|
|
}
|
|
}
|
|
AUDIT_ARG_PROCESS(p);
|
|
|
|
if ((p->p_flag & P_WEXIT) != 0) {
|
|
error = ESRCH;
|
|
goto fail;
|
|
}
|
|
if ((error = p_cansee(td, p)) != 0)
|
|
goto fail;
|
|
|
|
if ((error = p_candebug(td, p)) != 0)
|
|
goto fail;
|
|
|
|
/*
|
|
* System processes can't be debugged.
|
|
*/
|
|
if ((p->p_flag & P_SYSTEM) != 0) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (tid == 0) {
|
|
if ((p->p_flag & P_STOPPED_TRACE) != 0) {
|
|
KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
|
|
td2 = p->p_xthread;
|
|
} else {
|
|
td2 = FIRST_THREAD_IN_PROC(p);
|
|
}
|
|
tid = td2->td_tid;
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
/*
|
|
* Test if we're a 32 bit client and what the target is.
|
|
* Set the wrap controls accordingly.
|
|
*/
|
|
if (SV_CURPROC_FLAG(SV_ILP32)) {
|
|
if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
|
|
safe = 1;
|
|
wrap32 = 1;
|
|
}
|
|
#endif
|
|
/*
|
|
* Permissions check
|
|
*/
|
|
switch (req) {
|
|
case PT_TRACE_ME:
|
|
/* Always legal. */
|
|
break;
|
|
|
|
case PT_ATTACH:
|
|
/* Self */
|
|
if (p->p_pid == td->td_proc->p_pid) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
/* Already traced */
|
|
if (p->p_flag & P_TRACED) {
|
|
error = EBUSY;
|
|
goto fail;
|
|
}
|
|
|
|
/* Can't trace an ancestor if you're being traced. */
|
|
if (curp->p_flag & P_TRACED) {
|
|
for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
|
|
if (pp == p) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* OK */
|
|
break;
|
|
|
|
case PT_CLEARSTEP:
|
|
/* Allow thread to clear single step for itself */
|
|
if (td->td_tid == tid)
|
|
break;
|
|
|
|
/* FALLTHROUGH */
|
|
default:
|
|
/* not being traced... */
|
|
if ((p->p_flag & P_TRACED) == 0) {
|
|
error = EPERM;
|
|
goto fail;
|
|
}
|
|
|
|
/* not being traced by YOU */
|
|
if (p->p_pptr != td->td_proc) {
|
|
error = EBUSY;
|
|
goto fail;
|
|
}
|
|
|
|
/* not currently stopped */
|
|
if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
|
|
p->p_suspcount != p->p_numthreads ||
|
|
(p->p_flag & P_WAITED) == 0) {
|
|
error = EBUSY;
|
|
goto fail;
|
|
}
|
|
|
|
if ((p->p_flag & P_STOPPED_TRACE) == 0) {
|
|
static int count = 0;
|
|
if (count++ == 0)
|
|
printf("P_STOPPED_TRACE not set.\n");
|
|
}
|
|
|
|
/* OK */
|
|
break;
|
|
}
|
|
|
|
/* Keep this process around until we finish this request. */
|
|
_PHOLD(p);
|
|
|
|
#ifdef FIX_SSTEP
|
|
/*
|
|
* Single step fixup ala procfs
|
|
*/
|
|
FIX_SSTEP(td2);
|
|
#endif
|
|
|
|
/*
|
|
* Actually do the requests
|
|
*/
|
|
|
|
td->td_retval[0] = 0;
|
|
|
|
switch (req) {
|
|
case PT_TRACE_ME:
|
|
/* set my trace flag and "owner" so it can read/write me */
|
|
p->p_flag |= P_TRACED;
|
|
if (p->p_flag & P_PPWAIT)
|
|
p->p_flag |= P_PPTRACE;
|
|
p->p_oppid = p->p_pptr->p_pid;
|
|
break;
|
|
|
|
case PT_ATTACH:
|
|
/* security check done above */
|
|
/*
|
|
* It would be nice if the tracing relationship was separate
|
|
* from the parent relationship but that would require
|
|
* another set of links in the proc struct or for "wait"
|
|
* to scan the entire proc table. To make life easier,
|
|
* we just re-parent the process we're trying to trace.
|
|
* The old parent is remembered so we can put things back
|
|
* on a "detach".
|
|
*/
|
|
p->p_flag |= P_TRACED;
|
|
p->p_oppid = p->p_pptr->p_pid;
|
|
if (p->p_pptr != td->td_proc) {
|
|
proc_reparent(p, td->td_proc);
|
|
}
|
|
data = SIGSTOP;
|
|
goto sendsig; /* in PT_CONTINUE below */
|
|
|
|
case PT_CLEARSTEP:
|
|
error = ptrace_clear_single_step(td2);
|
|
break;
|
|
|
|
case PT_SETSTEP:
|
|
error = ptrace_single_step(td2);
|
|
break;
|
|
|
|
case PT_SUSPEND:
|
|
td2->td_dbgflags |= TDB_SUSPEND;
|
|
thread_lock(td2);
|
|
td2->td_flags |= TDF_NEEDSUSPCHK;
|
|
thread_unlock(td2);
|
|
break;
|
|
|
|
case PT_RESUME:
|
|
td2->td_dbgflags &= ~TDB_SUSPEND;
|
|
break;
|
|
|
|
case PT_FOLLOW_FORK:
|
|
if (data)
|
|
p->p_flag |= P_FOLLOWFORK;
|
|
else
|
|
p->p_flag &= ~P_FOLLOWFORK;
|
|
break;
|
|
|
|
case PT_STEP:
|
|
case PT_CONTINUE:
|
|
case PT_TO_SCE:
|
|
case PT_TO_SCX:
|
|
case PT_SYSCALL:
|
|
case PT_DETACH:
|
|
/* Zero means do not send any signal */
|
|
if (data < 0 || data > _SIG_MAXSIG) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
switch (req) {
|
|
case PT_STEP:
|
|
error = ptrace_single_step(td2);
|
|
if (error)
|
|
goto out;
|
|
break;
|
|
case PT_CONTINUE:
|
|
case PT_TO_SCE:
|
|
case PT_TO_SCX:
|
|
case PT_SYSCALL:
|
|
if (addr != (void *)1) {
|
|
error = ptrace_set_pc(td2,
|
|
(u_long)(uintfptr_t)addr);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
switch (req) {
|
|
case PT_TO_SCE:
|
|
p->p_stops |= S_PT_SCE;
|
|
break;
|
|
case PT_TO_SCX:
|
|
p->p_stops |= S_PT_SCX;
|
|
break;
|
|
case PT_SYSCALL:
|
|
p->p_stops |= S_PT_SCE | S_PT_SCX;
|
|
break;
|
|
}
|
|
break;
|
|
case PT_DETACH:
|
|
/* reset process parent */
|
|
if (p->p_oppid != p->p_pptr->p_pid) {
|
|
PROC_LOCK(p->p_pptr);
|
|
sigqueue_take(p->p_ksi);
|
|
PROC_UNLOCK(p->p_pptr);
|
|
|
|
pp = proc_realparent(p);
|
|
proc_reparent(p, pp);
|
|
if (pp == initproc)
|
|
p->p_sigparent = SIGCHLD;
|
|
}
|
|
p->p_oppid = 0;
|
|
p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
|
|
|
|
/* should we send SIGCHLD? */
|
|
/* childproc_continued(p); */
|
|
break;
|
|
}
|
|
|
|
sendsig:
|
|
if (proctree_locked) {
|
|
sx_xunlock(&proctree_lock);
|
|
proctree_locked = 0;
|
|
}
|
|
p->p_xstat = data;
|
|
p->p_xthread = NULL;
|
|
if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
|
|
/* deliver or queue signal */
|
|
td2->td_dbgflags &= ~TDB_XSIG;
|
|
td2->td_xsig = data;
|
|
|
|
if (req == PT_DETACH) {
|
|
FOREACH_THREAD_IN_PROC(p, td3)
|
|
td3->td_dbgflags &= ~TDB_SUSPEND;
|
|
}
|
|
/*
|
|
* unsuspend all threads, to not let a thread run,
|
|
* you should use PT_SUSPEND to suspend it before
|
|
* continuing process.
|
|
*/
|
|
PROC_SLOCK(p);
|
|
p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
|
|
thread_unsuspend(p);
|
|
PROC_SUNLOCK(p);
|
|
if (req == PT_ATTACH)
|
|
kern_psignal(p, data);
|
|
} else {
|
|
if (data)
|
|
kern_psignal(p, data);
|
|
}
|
|
break;
|
|
|
|
case PT_WRITE_I:
|
|
case PT_WRITE_D:
|
|
td2->td_dbgflags |= TDB_USERWR;
|
|
write = 1;
|
|
/* FALLTHROUGH */
|
|
case PT_READ_I:
|
|
case PT_READ_D:
|
|
PROC_UNLOCK(p);
|
|
tmp = 0;
|
|
/* write = 0 set above */
|
|
iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
|
|
iov.iov_len = sizeof(int);
|
|
uio.uio_iov = &iov;
|
|
uio.uio_iovcnt = 1;
|
|
uio.uio_offset = (off_t)(uintptr_t)addr;
|
|
uio.uio_resid = sizeof(int);
|
|
uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
|
|
uio.uio_rw = write ? UIO_WRITE : UIO_READ;
|
|
uio.uio_td = td;
|
|
error = proc_rwmem(p, &uio);
|
|
if (uio.uio_resid != 0) {
|
|
/*
|
|
* XXX proc_rwmem() doesn't currently return ENOSPC,
|
|
* so I think write() can bogusly return 0.
|
|
* XXX what happens for short writes? We don't want
|
|
* to write partial data.
|
|
* XXX proc_rwmem() returns EPERM for other invalid
|
|
* addresses. Convert this to EINVAL. Does this
|
|
* clobber returns of EPERM for other reasons?
|
|
*/
|
|
if (error == 0 || error == ENOSPC || error == EPERM)
|
|
error = EINVAL; /* EOF */
|
|
}
|
|
if (!write)
|
|
td->td_retval[0] = tmp;
|
|
PROC_LOCK(p);
|
|
break;
|
|
|
|
case PT_IO:
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (wrap32) {
|
|
piod32 = addr;
|
|
iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
|
|
iov.iov_len = piod32->piod_len;
|
|
uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
|
|
uio.uio_resid = piod32->piod_len;
|
|
} else
|
|
#endif
|
|
{
|
|
piod = addr;
|
|
iov.iov_base = piod->piod_addr;
|
|
iov.iov_len = piod->piod_len;
|
|
uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
|
|
uio.uio_resid = piod->piod_len;
|
|
}
|
|
uio.uio_iov = &iov;
|
|
uio.uio_iovcnt = 1;
|
|
uio.uio_segflg = UIO_USERSPACE;
|
|
uio.uio_td = td;
|
|
#ifdef COMPAT_FREEBSD32
|
|
tmp = wrap32 ? piod32->piod_op : piod->piod_op;
|
|
#else
|
|
tmp = piod->piod_op;
|
|
#endif
|
|
switch (tmp) {
|
|
case PIOD_READ_D:
|
|
case PIOD_READ_I:
|
|
uio.uio_rw = UIO_READ;
|
|
break;
|
|
case PIOD_WRITE_D:
|
|
case PIOD_WRITE_I:
|
|
td2->td_dbgflags |= TDB_USERWR;
|
|
uio.uio_rw = UIO_WRITE;
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
error = proc_rwmem(p, &uio);
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (wrap32)
|
|
piod32->piod_len -= uio.uio_resid;
|
|
else
|
|
#endif
|
|
piod->piod_len -= uio.uio_resid;
|
|
PROC_LOCK(p);
|
|
break;
|
|
|
|
case PT_KILL:
|
|
data = SIGKILL;
|
|
goto sendsig; /* in PT_CONTINUE above */
|
|
|
|
case PT_SETREGS:
|
|
td2->td_dbgflags |= TDB_USERWR;
|
|
error = PROC_WRITE(regs, td2, addr);
|
|
break;
|
|
|
|
case PT_GETREGS:
|
|
error = PROC_READ(regs, td2, addr);
|
|
break;
|
|
|
|
case PT_SETFPREGS:
|
|
td2->td_dbgflags |= TDB_USERWR;
|
|
error = PROC_WRITE(fpregs, td2, addr);
|
|
break;
|
|
|
|
case PT_GETFPREGS:
|
|
error = PROC_READ(fpregs, td2, addr);
|
|
break;
|
|
|
|
case PT_SETDBREGS:
|
|
td2->td_dbgflags |= TDB_USERWR;
|
|
error = PROC_WRITE(dbregs, td2, addr);
|
|
break;
|
|
|
|
case PT_GETDBREGS:
|
|
error = PROC_READ(dbregs, td2, addr);
|
|
break;
|
|
|
|
case PT_LWPINFO:
|
|
if (data <= 0 ||
|
|
#ifdef COMPAT_FREEBSD32
|
|
(!wrap32 && data > sizeof(*pl)) ||
|
|
(wrap32 && data > sizeof(*pl32))) {
|
|
#else
|
|
data > sizeof(*pl)) {
|
|
#endif
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (wrap32) {
|
|
pl = &plr;
|
|
pl32 = addr;
|
|
} else
|
|
#endif
|
|
pl = addr;
|
|
pl->pl_lwpid = td2->td_tid;
|
|
pl->pl_event = PL_EVENT_NONE;
|
|
pl->pl_flags = 0;
|
|
if (td2->td_dbgflags & TDB_XSIG) {
|
|
pl->pl_event = PL_EVENT_SIGNAL;
|
|
if (td2->td_dbgksi.ksi_signo != 0 &&
|
|
#ifdef COMPAT_FREEBSD32
|
|
((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
|
|
pl_siginfo) + sizeof(pl->pl_siginfo)) ||
|
|
(wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
|
|
pl_siginfo) + sizeof(struct siginfo32)))
|
|
#else
|
|
data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
|
|
+ sizeof(pl->pl_siginfo)
|
|
#endif
|
|
){
|
|
pl->pl_flags |= PL_FLAG_SI;
|
|
pl->pl_siginfo = td2->td_dbgksi.ksi_info;
|
|
}
|
|
}
|
|
if ((pl->pl_flags & PL_FLAG_SI) == 0)
|
|
bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
|
|
if (td2->td_dbgflags & TDB_SCE)
|
|
pl->pl_flags |= PL_FLAG_SCE;
|
|
else if (td2->td_dbgflags & TDB_SCX)
|
|
pl->pl_flags |= PL_FLAG_SCX;
|
|
if (td2->td_dbgflags & TDB_EXEC)
|
|
pl->pl_flags |= PL_FLAG_EXEC;
|
|
if (td2->td_dbgflags & TDB_FORK) {
|
|
pl->pl_flags |= PL_FLAG_FORKED;
|
|
pl->pl_child_pid = td2->td_dbg_forked;
|
|
}
|
|
if (td2->td_dbgflags & TDB_CHILD)
|
|
pl->pl_flags |= PL_FLAG_CHILD;
|
|
pl->pl_sigmask = td2->td_sigmask;
|
|
pl->pl_siglist = td2->td_siglist;
|
|
strcpy(pl->pl_tdname, td2->td_name);
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (wrap32)
|
|
ptrace_lwpinfo_to32(pl, pl32);
|
|
#endif
|
|
break;
|
|
|
|
case PT_GETNUMLWPS:
|
|
td->td_retval[0] = p->p_numthreads;
|
|
break;
|
|
|
|
case PT_GETLWPLIST:
|
|
if (data <= 0) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
num = imin(p->p_numthreads, data);
|
|
PROC_UNLOCK(p);
|
|
buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
|
|
tmp = 0;
|
|
PROC_LOCK(p);
|
|
FOREACH_THREAD_IN_PROC(p, td2) {
|
|
if (tmp >= num)
|
|
break;
|
|
buf[tmp++] = td2->td_tid;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
error = copyout(buf, addr, tmp * sizeof(lwpid_t));
|
|
free(buf, M_TEMP);
|
|
if (!error)
|
|
td->td_retval[0] = tmp;
|
|
PROC_LOCK(p);
|
|
break;
|
|
|
|
case PT_VM_TIMESTAMP:
|
|
td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
|
|
break;
|
|
|
|
case PT_VM_ENTRY:
|
|
PROC_UNLOCK(p);
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (wrap32)
|
|
error = ptrace_vm_entry32(td, p, addr);
|
|
else
|
|
#endif
|
|
error = ptrace_vm_entry(td, p, addr);
|
|
PROC_LOCK(p);
|
|
break;
|
|
|
|
default:
|
|
#ifdef __HAVE_PTRACE_MACHDEP
|
|
if (req >= PT_FIRSTMACH) {
|
|
PROC_UNLOCK(p);
|
|
error = cpu_ptrace(td2, req, addr, data);
|
|
PROC_LOCK(p);
|
|
} else
|
|
#endif
|
|
/* Unknown request. */
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
out:
|
|
/* Drop our hold on this process now that the request has completed. */
|
|
_PRELE(p);
|
|
fail:
|
|
PROC_UNLOCK(p);
|
|
if (proctree_locked)
|
|
sx_xunlock(&proctree_lock);
|
|
return (error);
|
|
}
|
|
#undef PROC_READ
|
|
#undef PROC_WRITE
|
|
|
|
/*
|
|
* Stop a process because of a debugging event;
|
|
* stay stopped until p->p_step is cleared
|
|
* (cleared by PIOCCONT in procfs).
|
|
*/
|
|
void
|
|
stopevent(struct proc *p, unsigned int event, unsigned int val)
|
|
{
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
p->p_step = 1;
|
|
do {
|
|
p->p_xstat = val;
|
|
p->p_xthread = NULL;
|
|
p->p_stype = event; /* Which event caused the stop? */
|
|
wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
|
|
msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
|
|
} while (p->p_step);
|
|
}
|