Author: trasz Date: Thu Feb 16 13:32:15 2017 New Revision: 313809 URL: https://svnweb.freebsd.org/changeset/base/313809
Log: Implement linux version of ptrace(2). It's nowhere near complete, but it allows to use 64 bit linux strace(1) on 64 bit linux binaries. Reviewed by: dchagin (earlier version) MFC after: 2 weeks Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D9406 Added: head/sys/amd64/linux/linux_ptrace.c (contents, props changed) Modified: head/sys/amd64/linux/linux_dummy.c head/sys/modules/linux64/Makefile Modified: head/sys/amd64/linux/linux_dummy.c ============================================================================== --- head/sys/amd64/linux/linux_dummy.c Thu Feb 16 12:56:10 2017 (r313808) +++ head/sys/amd64/linux/linux_dummy.c Thu Feb 16 13:32:15 2017 (r313809) @@ -45,7 +45,6 @@ LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); DUMMY(mincore); DUMMY(sendfile); -DUMMY(ptrace); DUMMY(syslog); DUMMY(setfsuid); DUMMY(setfsgid); Added: head/sys/amd64/linux/linux_ptrace.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/amd64/linux/linux_ptrace.c Thu Feb 16 13:32:15 2017 (r313809) @@ -0,0 +1,414 @@ +/*- + * Copyright (c) 2017 Edward Tomasz Napierala <tr...@freebsd.org> + * All rights reserved. + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) + * ("CTSRD"), as part of the DARPA CRASH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/proc.h> +#include <sys/ptrace.h> +#include <sys/syscallsubr.h> + +#include <machine/pcb.h> +#include <machine/reg.h> + +#include <amd64/linux/linux.h> +#include <amd64/linux/linux_proto.h> +#include <compat/linux/linux_signal.h> + +#define LINUX_PTRACE_TRACEME 0 +#define LINUX_PTRACE_PEEKTEXT 1 +#define LINUX_PTRACE_PEEKDATA 2 +#define LINUX_PTRACE_PEEKUSER 3 +#define LINUX_PTRACE_POKETEXT 4 +#define LINUX_PTRACE_POKEDATA 5 +#define LINUX_PTRACE_POKEUSER 6 +#define LINUX_PTRACE_CONT 7 +#define LINUX_PTRACE_KILL 8 +#define LINUX_PTRACE_SINGLESTEP 9 +#define LINUX_PTRACE_GETREGS 12 +#define LINUX_PTRACE_SETREGS 13 +#define LINUX_PTRACE_GETFPREGS 14 +#define LINUX_PTRACE_SETFPREGS 15 +#define LINUX_PTRACE_ATTACH 16 +#define LINUX_PTRACE_DETACH 17 +#define LINUX_PTRACE_SYSCALL 24 +#define LINUX_PTRACE_SETOPTIONS 0x4200 +#define LINUX_PTRACE_GETREGSET 0x4204 +#define LINUX_PTRACE_SEIZE 0x4206 + +#define LINUX_PTRACE_O_TRACESYSGOOD 1 +#define LINUX_PTRACE_O_TRACEFORK 2 +#define LINUX_PTRACE_O_TRACEVFORK 4 +#define LINUX_PTRACE_O_TRACECLONE 8 +#define LINUX_PTRACE_O_TRACEEXEC 16 +#define LINUX_PTRACE_O_TRACEVFORKDONE 32 +#define LINUX_PTRACE_O_TRACEEXIT 64 +#define LINUX_PTRACE_O_TRACESECCOMP 128 +#define LINUX_PTRACE_O_EXITKILL 1048576 +#define LINUX_PTRACE_O_SUSPEND_SECCOMP 2097152 + +#define LINUX_NT_PRSTATUS 1 + +#define LINUX_PTRACE_O_MASK (LINUX_PTRACE_O_TRACESYSGOOD | \ + LINUX_PTRACE_O_TRACEFORK | LINUX_PTRACE_O_TRACEVFORK | \ + LINUX_PTRACE_O_TRACECLONE | LINUX_PTRACE_O_TRACEEXEC | \ + LINUX_PTRACE_O_TRACEVFORKDONE | LINUX_PTRACE_O_TRACEEXIT | \ + LINUX_PTRACE_O_TRACESECCOMP | LINUX_PTRACE_O_EXITKILL | \ + LINUX_PTRACE_O_SUSPEND_SECCOMP) + +static int +map_signum(int lsig, int *bsigp) +{ + int bsig; + + if (lsig == 0) { + *bsigp = 0; + return (0); + } + + if (lsig < 0 || lsig > LINUX_SIGRTMAX) + return (EINVAL); + + bsig = linux_to_bsd_signal(lsig); + if (bsig == SIGSTOP) + bsig = 0; + + *bsigp = bsig; + return (0); +} + +struct linux_pt_reg { + l_ulong r15; + l_ulong r14; + l_ulong r13; + l_ulong r12; + l_ulong rbp; + l_ulong rbx; + l_ulong r11; + l_ulong r10; + l_ulong r9; + l_ulong r8; + l_ulong rax; + l_ulong rcx; + l_ulong rdx; + l_ulong rsi; + l_ulong rdi; + l_ulong orig_rax; + l_ulong rip; + l_ulong cs; + l_ulong eflags; + l_ulong rsp; + l_ulong ss; +}; + +/* + * Translate amd64 ptrace registers between Linux and FreeBSD formats. + * The translation is pretty straighforward, for all registers but + * orig_rax on Linux side and r_trapno and r_err in FreeBSD. + */ +static void +map_regs_to_linux(struct reg *b_reg, struct linux_pt_reg *l_reg) +{ + + l_reg->r15 = b_reg->r_r15; + l_reg->r14 = b_reg->r_r14; + l_reg->r13 = b_reg->r_r13; + l_reg->r12 = b_reg->r_r12; + l_reg->rbp = b_reg->r_rbp; + l_reg->rbx = b_reg->r_rbx; + l_reg->r11 = b_reg->r_r11; + l_reg->r10 = b_reg->r_r10; + l_reg->r9 = b_reg->r_r9; + l_reg->r8 = b_reg->r_r8; + l_reg->rax = b_reg->r_rax; + l_reg->rcx = b_reg->r_rcx; + l_reg->rdx = b_reg->r_rdx; + l_reg->rsi = b_reg->r_rsi; + l_reg->rdi = b_reg->r_rdi; + l_reg->orig_rax = b_reg->r_rax; + l_reg->rip = b_reg->r_rip; + l_reg->cs = b_reg->r_cs; + l_reg->eflags = b_reg->r_rflags; + l_reg->rsp = b_reg->r_rsp; + l_reg->ss = b_reg->r_ss; +} + +static void +map_regs_from_linux(struct reg *b_reg, struct linux_pt_reg *l_reg) +{ + b_reg->r_r15 = l_reg->r15; + b_reg->r_r14 = l_reg->r14; + b_reg->r_r13 = l_reg->r13; + b_reg->r_r12 = l_reg->r12; + b_reg->r_r11 = l_reg->r11; + b_reg->r_r10 = l_reg->r10; + b_reg->r_r9 = l_reg->r9; + b_reg->r_r8 = l_reg->r8; + b_reg->r_rdi = l_reg->rdi; + b_reg->r_rsi = l_reg->rsi; + b_reg->r_rbp = l_reg->rbp; + b_reg->r_rbx = l_reg->rbx; + b_reg->r_rdx = l_reg->rdx; + b_reg->r_rcx = l_reg->rcx; + b_reg->r_rax = l_reg->rax; + + /* + * XXX: Are zeroes the right thing to put here? + */ + b_reg->r_trapno = 0; + b_reg->r_fs = 0; + b_reg->r_gs = 0; + b_reg->r_err = 0; + b_reg->r_es = 0; + b_reg->r_ds = 0; + + b_reg->r_rip = l_reg->rip; + b_reg->r_cs = l_reg->cs; + b_reg->r_rflags = l_reg->eflags; + b_reg->r_rsp = l_reg->rsp; + b_reg->r_ss = l_reg->ss; +} + +static int +linux_ptrace_peek(struct thread *td, pid_t pid, void *addr, void *data) +{ + int error; + + error = kern_ptrace(td, PT_READ_I, pid, addr, 0); + if (error == 0) + error = copyout(td->td_retval, data, sizeof(l_int)); + td->td_retval[0] = error; + + return (error); +} + +static int +linux_ptrace_setoptions(struct thread *td, pid_t pid, l_ulong data) +{ + int mask; + + mask = 0; + + if (data & ~LINUX_PTRACE_O_MASK) { + printf("%s: unknown ptrace option %lx set; " + "returning EINVAL\n", + __func__, data & ~LINUX_PTRACE_O_MASK); + return (EINVAL); + } + + /* + * PTRACE_O_EXITKILL is ignored, we do that by default. + */ + + if (data & LINUX_PTRACE_O_TRACESYSGOOD) { + printf("%s: PTRACE_O_TRACESYSGOOD not implemented; " + "returning EINVAL\n", __func__); + return (EINVAL); + } + + if (data & LINUX_PTRACE_O_TRACEFORK) + mask |= PTRACE_FORK; + + if (data & LINUX_PTRACE_O_TRACEVFORK) + mask |= PTRACE_VFORK; + + if (data & LINUX_PTRACE_O_TRACECLONE) + mask |= PTRACE_VFORK; + + if (data & LINUX_PTRACE_O_TRACEEXEC) + mask |= PTRACE_EXEC; + + if (data & LINUX_PTRACE_O_TRACEVFORKDONE) + mask |= PTRACE_VFORK; /* XXX: Close enough? */ + + if (data & LINUX_PTRACE_O_TRACEEXIT) { + printf("%s: PTRACE_O_TRACEEXIT not implemented; " + "returning EINVAL\n", __func__); + return (EINVAL); + } + + return (kern_ptrace(td, PT_SET_EVENT_MASK, pid, &mask, sizeof(mask))); +} + +static int +linux_ptrace_getregs(struct thread *td, pid_t pid, void *data) +{ + struct ptrace_lwpinfo lwpinfo; + struct reg b_reg; + struct linux_pt_reg l_reg; + int error; + + error = kern_ptrace(td, PT_GETREGS, pid, &b_reg, 0); + if (error != 0) + return (error); + + map_regs_to_linux(&b_reg, &l_reg); + + /* + * The strace(1) utility depends on RAX being set to -ENOSYS + * on syscall entry. + */ + error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo)); + if (error != 0) { + printf("%s: PT_LWPINFO failed with error %d\n", __func__, error); + return (error); + } + if (lwpinfo.pl_flags & PL_FLAG_SCE) + l_reg.rax = -38; // XXX: Don't hardcode? + + error = copyout(&l_reg, (void *)data, sizeof(l_reg)); + return (error); +} + +static int +linux_ptrace_setregs(struct thread *td, pid_t pid, void *data) +{ + struct reg b_reg; + struct linux_pt_reg l_reg; + int error; + + error = copyin(data, &l_reg, sizeof(l_reg)); + if (error != 0) + return (error); + map_regs_from_linux(&b_reg, &l_reg); + error = kern_ptrace(td, PT_SETREGS, pid, &b_reg, 0); + return (error); +} + +static int +linux_ptrace_getregset(struct thread *td, pid_t pid, l_ulong addr, l_ulong data) +{ + + switch (addr) { + case LINUX_NT_PRSTATUS: + printf("%s: NT_PRSTATUS not implemented; returning EINVAL\n", + __func__); + return (EINVAL); + default: + printf("%s: PTRACE_GETREGSET request %ld not implemented; " + "returning EINVAL\n", __func__, addr); + return (EINVAL); + } +} + +static int +linux_ptrace_seize(struct thread *td, pid_t pid, l_ulong addr, l_ulong data) +{ + + printf("%s: PTRACE_SEIZE not implemented; returning EINVAL\n", __func__); + return (EINVAL); +} + +int +linux_ptrace(struct thread *td, struct linux_ptrace_args *uap) +{ + void *addr; + pid_t pid; + int error, sig; + + pid = (pid_t)uap->pid; + addr = (void *)uap->addr; + + switch (uap->req) { + case LINUX_PTRACE_TRACEME: + error = kern_ptrace(td, PT_TRACE_ME, 0, 0, 0); + break; + case LINUX_PTRACE_PEEKTEXT: + case LINUX_PTRACE_PEEKDATA: + error = linux_ptrace_peek(td, pid, addr, (void *)uap->data); + if (error != 0) + return (error); + /* + * Linux expects this syscall to read 64 bits, not 32. + */ + error = linux_ptrace_peek(td, pid, + (void *)(uap->addr + 4), (void *)(uap->data + 4)); + break; + case LINUX_PTRACE_POKETEXT: + error = kern_ptrace(td, PT_WRITE_I, pid, addr, uap->data); + break; + case LINUX_PTRACE_POKEDATA: + error = kern_ptrace(td, PT_WRITE_D, pid, addr, uap->data); + break; + case LINUX_PTRACE_CONT: + error = map_signum(uap->data, &sig); + if (error != 0) + break; + error = kern_ptrace(td, PT_CONTINUE, pid, (void *)1, sig); + break; + case LINUX_PTRACE_KILL: + error = kern_ptrace(td, PT_KILL, pid, addr, uap->data); + break; + case LINUX_PTRACE_SINGLESTEP: + error = map_signum(uap->data, &sig); + if (error != 0) + break; + error = kern_ptrace(td, PT_STEP, pid, (void *)1, sig); + break; + case LINUX_PTRACE_GETREGS: + error = linux_ptrace_getregs(td, pid, (void *)uap->data); + break; + case LINUX_PTRACE_SETREGS: + error = linux_ptrace_setregs(td, pid, (void *)uap->data); + break; + case LINUX_PTRACE_ATTACH: + error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data); + break; + case LINUX_PTRACE_DETACH: + error = map_signum(uap->data, &sig); + if (error != 0) + break; + error = kern_ptrace(td, PT_DETACH, pid, (void *)1, sig); + break; + case LINUX_PTRACE_SYSCALL: + error = map_signum(uap->data, &sig); + if (error != 0) + break; + error = kern_ptrace(td, PT_SYSCALL, pid, (void *)1, sig); + break; + case LINUX_PTRACE_SETOPTIONS: + error = linux_ptrace_setoptions(td, pid, uap->data); + break; + case LINUX_PTRACE_GETREGSET: + error = linux_ptrace_getregset(td, pid, uap->addr, uap->data); + break; + case LINUX_PTRACE_SEIZE: + error = linux_ptrace_seize(td, pid, uap->addr, uap->data); + break; + default: + printf("%s: ptrace(%ld, ...) not implemented; returning EINVAL\n", + __func__, uap->req); + error = EINVAL; + break; + } + + return (error); +} Modified: head/sys/modules/linux64/Makefile ============================================================================== --- head/sys/modules/linux64/Makefile Thu Feb 16 12:56:10 2017 (r313808) +++ head/sys/modules/linux64/Makefile Thu Feb 16 13:32:15 2017 (r313809) @@ -7,7 +7,7 @@ VDSO= linux_vdso KMOD= linux64 SRCS= linux_fork.c linux_dummy.c linux_file.c linux_event.c \ linux_futex.c linux_getcwd.c linux_ioctl.c linux_ipc.c \ - linux_machdep.c linux_misc.c linux_signal.c \ + linux_machdep.c linux_misc.c linux_ptrace.c linux_signal.c \ linux_socket.c linux_stats.c linux_sysctl.c linux_sysent.c \ linux_sysvec.c linux_time.c linux_vdso.c linux_timer.c \ opt_inet6.h opt_compat.h opt_posix.h opt_usb.h \ _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
