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freebsd-nq/sys/amd64/linux/linux_ptrace.c
Edward Tomasz Napierala d82de05480 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
2017-02-16 13:32:15 +00:00

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/*-
* Copyright (c) 2017 Edward Tomasz Napierala <trasz@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);
}
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