mirror of
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d82de05480
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
415 lines
11 KiB
C
415 lines
11 KiB
C
/*-
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* Copyright (c) 2017 Edward Tomasz Napierala <trasz@FreeBSD.org>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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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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*
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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 <sys/param.h>
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#include <sys/proc.h>
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#include <sys/ptrace.h>
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#include <sys/syscallsubr.h>
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#include <machine/pcb.h>
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#include <machine/reg.h>
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#include <amd64/linux/linux.h>
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#include <amd64/linux/linux_proto.h>
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#include <compat/linux/linux_signal.h>
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#define LINUX_PTRACE_TRACEME 0
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#define LINUX_PTRACE_PEEKTEXT 1
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#define LINUX_PTRACE_PEEKDATA 2
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#define LINUX_PTRACE_PEEKUSER 3
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#define LINUX_PTRACE_POKETEXT 4
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#define LINUX_PTRACE_POKEDATA 5
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#define LINUX_PTRACE_POKEUSER 6
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#define LINUX_PTRACE_CONT 7
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#define LINUX_PTRACE_KILL 8
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#define LINUX_PTRACE_SINGLESTEP 9
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#define LINUX_PTRACE_GETREGS 12
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#define LINUX_PTRACE_SETREGS 13
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#define LINUX_PTRACE_GETFPREGS 14
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#define LINUX_PTRACE_SETFPREGS 15
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#define LINUX_PTRACE_ATTACH 16
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#define LINUX_PTRACE_DETACH 17
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#define LINUX_PTRACE_SYSCALL 24
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#define LINUX_PTRACE_SETOPTIONS 0x4200
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#define LINUX_PTRACE_GETREGSET 0x4204
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#define LINUX_PTRACE_SEIZE 0x4206
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#define LINUX_PTRACE_O_TRACESYSGOOD 1
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#define LINUX_PTRACE_O_TRACEFORK 2
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#define LINUX_PTRACE_O_TRACEVFORK 4
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#define LINUX_PTRACE_O_TRACECLONE 8
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#define LINUX_PTRACE_O_TRACEEXEC 16
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#define LINUX_PTRACE_O_TRACEVFORKDONE 32
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#define LINUX_PTRACE_O_TRACEEXIT 64
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#define LINUX_PTRACE_O_TRACESECCOMP 128
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#define LINUX_PTRACE_O_EXITKILL 1048576
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#define LINUX_PTRACE_O_SUSPEND_SECCOMP 2097152
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#define LINUX_NT_PRSTATUS 1
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#define LINUX_PTRACE_O_MASK (LINUX_PTRACE_O_TRACESYSGOOD | \
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LINUX_PTRACE_O_TRACEFORK | LINUX_PTRACE_O_TRACEVFORK | \
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LINUX_PTRACE_O_TRACECLONE | LINUX_PTRACE_O_TRACEEXEC | \
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LINUX_PTRACE_O_TRACEVFORKDONE | LINUX_PTRACE_O_TRACEEXIT | \
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LINUX_PTRACE_O_TRACESECCOMP | LINUX_PTRACE_O_EXITKILL | \
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LINUX_PTRACE_O_SUSPEND_SECCOMP)
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static int
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map_signum(int lsig, int *bsigp)
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{
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int bsig;
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if (lsig == 0) {
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*bsigp = 0;
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return (0);
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}
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if (lsig < 0 || lsig > LINUX_SIGRTMAX)
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return (EINVAL);
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bsig = linux_to_bsd_signal(lsig);
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if (bsig == SIGSTOP)
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bsig = 0;
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*bsigp = bsig;
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return (0);
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}
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struct linux_pt_reg {
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l_ulong r15;
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l_ulong r14;
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l_ulong r13;
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l_ulong r12;
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l_ulong rbp;
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l_ulong rbx;
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l_ulong r11;
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l_ulong r10;
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l_ulong r9;
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l_ulong r8;
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l_ulong rax;
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l_ulong rcx;
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l_ulong rdx;
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l_ulong rsi;
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l_ulong rdi;
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l_ulong orig_rax;
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l_ulong rip;
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l_ulong cs;
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l_ulong eflags;
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l_ulong rsp;
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l_ulong ss;
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};
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/*
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* Translate amd64 ptrace registers between Linux and FreeBSD formats.
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* The translation is pretty straighforward, for all registers but
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* orig_rax on Linux side and r_trapno and r_err in FreeBSD.
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*/
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static void
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map_regs_to_linux(struct reg *b_reg, struct linux_pt_reg *l_reg)
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{
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l_reg->r15 = b_reg->r_r15;
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l_reg->r14 = b_reg->r_r14;
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l_reg->r13 = b_reg->r_r13;
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l_reg->r12 = b_reg->r_r12;
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l_reg->rbp = b_reg->r_rbp;
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l_reg->rbx = b_reg->r_rbx;
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l_reg->r11 = b_reg->r_r11;
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l_reg->r10 = b_reg->r_r10;
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l_reg->r9 = b_reg->r_r9;
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l_reg->r8 = b_reg->r_r8;
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l_reg->rax = b_reg->r_rax;
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l_reg->rcx = b_reg->r_rcx;
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l_reg->rdx = b_reg->r_rdx;
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l_reg->rsi = b_reg->r_rsi;
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l_reg->rdi = b_reg->r_rdi;
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l_reg->orig_rax = b_reg->r_rax;
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l_reg->rip = b_reg->r_rip;
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l_reg->cs = b_reg->r_cs;
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l_reg->eflags = b_reg->r_rflags;
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l_reg->rsp = b_reg->r_rsp;
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l_reg->ss = b_reg->r_ss;
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}
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static void
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map_regs_from_linux(struct reg *b_reg, struct linux_pt_reg *l_reg)
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{
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b_reg->r_r15 = l_reg->r15;
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b_reg->r_r14 = l_reg->r14;
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b_reg->r_r13 = l_reg->r13;
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b_reg->r_r12 = l_reg->r12;
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b_reg->r_r11 = l_reg->r11;
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b_reg->r_r10 = l_reg->r10;
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b_reg->r_r9 = l_reg->r9;
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b_reg->r_r8 = l_reg->r8;
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b_reg->r_rdi = l_reg->rdi;
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b_reg->r_rsi = l_reg->rsi;
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b_reg->r_rbp = l_reg->rbp;
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b_reg->r_rbx = l_reg->rbx;
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b_reg->r_rdx = l_reg->rdx;
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b_reg->r_rcx = l_reg->rcx;
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b_reg->r_rax = l_reg->rax;
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/*
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* XXX: Are zeroes the right thing to put here?
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*/
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b_reg->r_trapno = 0;
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b_reg->r_fs = 0;
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b_reg->r_gs = 0;
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b_reg->r_err = 0;
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b_reg->r_es = 0;
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b_reg->r_ds = 0;
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b_reg->r_rip = l_reg->rip;
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b_reg->r_cs = l_reg->cs;
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b_reg->r_rflags = l_reg->eflags;
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b_reg->r_rsp = l_reg->rsp;
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b_reg->r_ss = l_reg->ss;
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}
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static int
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linux_ptrace_peek(struct thread *td, pid_t pid, void *addr, void *data)
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{
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int error;
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error = kern_ptrace(td, PT_READ_I, pid, addr, 0);
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if (error == 0)
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error = copyout(td->td_retval, data, sizeof(l_int));
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td->td_retval[0] = error;
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return (error);
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}
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static int
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linux_ptrace_setoptions(struct thread *td, pid_t pid, l_ulong data)
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{
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int mask;
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mask = 0;
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if (data & ~LINUX_PTRACE_O_MASK) {
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printf("%s: unknown ptrace option %lx set; "
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"returning EINVAL\n",
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__func__, data & ~LINUX_PTRACE_O_MASK);
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return (EINVAL);
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}
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/*
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* PTRACE_O_EXITKILL is ignored, we do that by default.
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*/
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if (data & LINUX_PTRACE_O_TRACESYSGOOD) {
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printf("%s: PTRACE_O_TRACESYSGOOD not implemented; "
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"returning EINVAL\n", __func__);
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return (EINVAL);
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}
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if (data & LINUX_PTRACE_O_TRACEFORK)
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mask |= PTRACE_FORK;
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if (data & LINUX_PTRACE_O_TRACEVFORK)
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mask |= PTRACE_VFORK;
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if (data & LINUX_PTRACE_O_TRACECLONE)
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mask |= PTRACE_VFORK;
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if (data & LINUX_PTRACE_O_TRACEEXEC)
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mask |= PTRACE_EXEC;
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if (data & LINUX_PTRACE_O_TRACEVFORKDONE)
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mask |= PTRACE_VFORK; /* XXX: Close enough? */
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if (data & LINUX_PTRACE_O_TRACEEXIT) {
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printf("%s: PTRACE_O_TRACEEXIT not implemented; "
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"returning EINVAL\n", __func__);
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return (EINVAL);
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}
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return (kern_ptrace(td, PT_SET_EVENT_MASK, pid, &mask, sizeof(mask)));
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}
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static int
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linux_ptrace_getregs(struct thread *td, pid_t pid, void *data)
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{
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struct ptrace_lwpinfo lwpinfo;
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struct reg b_reg;
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struct linux_pt_reg l_reg;
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int error;
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error = kern_ptrace(td, PT_GETREGS, pid, &b_reg, 0);
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if (error != 0)
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return (error);
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map_regs_to_linux(&b_reg, &l_reg);
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/*
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* The strace(1) utility depends on RAX being set to -ENOSYS
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* on syscall entry.
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*/
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error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo));
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if (error != 0) {
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printf("%s: PT_LWPINFO failed with error %d\n", __func__, error);
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return (error);
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}
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if (lwpinfo.pl_flags & PL_FLAG_SCE)
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l_reg.rax = -38; // XXX: Don't hardcode?
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error = copyout(&l_reg, (void *)data, sizeof(l_reg));
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return (error);
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}
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static int
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linux_ptrace_setregs(struct thread *td, pid_t pid, void *data)
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{
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struct reg b_reg;
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struct linux_pt_reg l_reg;
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int error;
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error = copyin(data, &l_reg, sizeof(l_reg));
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if (error != 0)
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return (error);
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map_regs_from_linux(&b_reg, &l_reg);
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error = kern_ptrace(td, PT_SETREGS, pid, &b_reg, 0);
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return (error);
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}
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static int
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linux_ptrace_getregset(struct thread *td, pid_t pid, l_ulong addr, l_ulong data)
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{
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switch (addr) {
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case LINUX_NT_PRSTATUS:
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printf("%s: NT_PRSTATUS not implemented; returning EINVAL\n",
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__func__);
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return (EINVAL);
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default:
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printf("%s: PTRACE_GETREGSET request %ld not implemented; "
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"returning EINVAL\n", __func__, addr);
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return (EINVAL);
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}
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}
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static int
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linux_ptrace_seize(struct thread *td, pid_t pid, l_ulong addr, l_ulong data)
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{
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printf("%s: PTRACE_SEIZE not implemented; returning EINVAL\n", __func__);
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return (EINVAL);
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}
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int
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linux_ptrace(struct thread *td, struct linux_ptrace_args *uap)
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{
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void *addr;
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pid_t pid;
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int error, sig;
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pid = (pid_t)uap->pid;
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addr = (void *)uap->addr;
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switch (uap->req) {
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case LINUX_PTRACE_TRACEME:
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error = kern_ptrace(td, PT_TRACE_ME, 0, 0, 0);
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break;
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case LINUX_PTRACE_PEEKTEXT:
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case LINUX_PTRACE_PEEKDATA:
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error = linux_ptrace_peek(td, pid, addr, (void *)uap->data);
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if (error != 0)
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return (error);
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/*
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* Linux expects this syscall to read 64 bits, not 32.
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*/
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error = linux_ptrace_peek(td, pid,
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(void *)(uap->addr + 4), (void *)(uap->data + 4));
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break;
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case LINUX_PTRACE_POKETEXT:
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error = kern_ptrace(td, PT_WRITE_I, pid, addr, uap->data);
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break;
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case LINUX_PTRACE_POKEDATA:
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error = kern_ptrace(td, PT_WRITE_D, pid, addr, uap->data);
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break;
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case LINUX_PTRACE_CONT:
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error = map_signum(uap->data, &sig);
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if (error != 0)
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break;
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error = kern_ptrace(td, PT_CONTINUE, pid, (void *)1, sig);
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break;
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case LINUX_PTRACE_KILL:
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error = kern_ptrace(td, PT_KILL, pid, addr, uap->data);
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break;
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case LINUX_PTRACE_SINGLESTEP:
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error = map_signum(uap->data, &sig);
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if (error != 0)
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break;
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error = kern_ptrace(td, PT_STEP, pid, (void *)1, sig);
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break;
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case LINUX_PTRACE_GETREGS:
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error = linux_ptrace_getregs(td, pid, (void *)uap->data);
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break;
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case LINUX_PTRACE_SETREGS:
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error = linux_ptrace_setregs(td, pid, (void *)uap->data);
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break;
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case LINUX_PTRACE_ATTACH:
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error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data);
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break;
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case LINUX_PTRACE_DETACH:
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error = map_signum(uap->data, &sig);
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if (error != 0)
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break;
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error = kern_ptrace(td, PT_DETACH, pid, (void *)1, sig);
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break;
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case LINUX_PTRACE_SYSCALL:
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error = map_signum(uap->data, &sig);
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if (error != 0)
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break;
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error = kern_ptrace(td, PT_SYSCALL, pid, (void *)1, sig);
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break;
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case LINUX_PTRACE_SETOPTIONS:
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error = linux_ptrace_setoptions(td, pid, uap->data);
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break;
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case LINUX_PTRACE_GETREGSET:
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error = linux_ptrace_getregset(td, pid, uap->addr, uap->data);
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break;
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case LINUX_PTRACE_SEIZE:
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error = linux_ptrace_seize(td, pid, uap->addr, uap->data);
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break;
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default:
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printf("%s: ptrace(%ld, ...) not implemented; returning EINVAL\n",
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__func__, uap->req);
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error = EINVAL;
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break;
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}
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return (error);
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}
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