372 lines
10 KiB
C
372 lines
10 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1993, David Greenman
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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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*
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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/exec.h>
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#include <sys/imgact.h>
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#include <sys/imgact_aout.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/syscall.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_param.h>
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#ifdef __amd64__
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#include <compat/freebsd32/freebsd32_signal.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/freebsd32/freebsd32_syscall.h>
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#include <compat/ia32/ia32_signal.h>
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#endif
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static int exec_aout_imgact(struct image_params *imgp);
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static int aout_fixup(uintptr_t *stack_base, struct image_params *imgp);
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#define AOUT32_USRSTACK 0xbfc00000
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#if defined(__i386__)
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#define AOUT32_PS_STRINGS (AOUT32_USRSTACK - sizeof(struct ps_strings))
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struct sysentvec aout_sysvec = {
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.sv_size = SYS_MAXSYSCALL,
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.sv_table = sysent,
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.sv_fixup = aout_fixup,
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.sv_sendsig = sendsig,
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.sv_sigcode = sigcode,
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.sv_szsigcode = &szsigcode,
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.sv_name = "FreeBSD a.out",
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.sv_coredump = NULL,
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.sv_imgact_try = NULL,
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.sv_minsigstksz = MINSIGSTKSZ,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = AOUT32_USRSTACK,
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.sv_usrstack = AOUT32_USRSTACK,
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.sv_psstrings = AOUT32_PS_STRINGS,
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.sv_psstringssz = sizeof(struct ps_strings),
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = exec_copyout_strings,
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.sv_setregs = exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = SV_ABI_FREEBSD | SV_AOUT | SV_IA32 | SV_ILP32,
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.sv_set_syscall_retval = cpu_set_syscall_retval,
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.sv_fetch_syscall_args = cpu_fetch_syscall_args,
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.sv_syscallnames = syscallnames,
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.sv_schedtail = NULL,
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.sv_thread_detach = NULL,
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.sv_trap = NULL,
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.sv_onexec_old = exec_onexec_old,
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.sv_onexit = exit_onexit,
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.sv_set_fork_retval = x86_set_fork_retval,
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};
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#elif defined(__amd64__)
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#include "vdso_ia32_offsets.h"
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extern const char _binary_elf_vdso32_so_1_start[];
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extern const char _binary_elf_vdso32_so_1_end[];
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extern char _binary_elf_vdso32_so_1_size;
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#define AOUT32_PS_STRINGS \
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(AOUT32_USRSTACK - sizeof(struct freebsd32_ps_strings))
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#define AOUT32_MINUSER FREEBSD32_MINUSER
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extern const char *freebsd32_syscallnames[];
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extern u_long ia32_maxssiz;
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static int aout_szsigcode;
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struct sysentvec aout_sysvec = {
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.sv_size = FREEBSD32_SYS_MAXSYSCALL,
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.sv_table = freebsd32_sysent,
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.sv_fixup = aout_fixup,
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.sv_sendsig = ia32_sendsig,
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.sv_sigcode = _binary_elf_vdso32_so_1_start,
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.sv_szsigcode = &aout_szsigcode,
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.sv_name = "FreeBSD a.out",
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.sv_coredump = NULL,
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.sv_imgact_try = NULL,
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.sv_minsigstksz = MINSIGSTKSZ,
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.sv_minuser = AOUT32_MINUSER,
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.sv_maxuser = AOUT32_USRSTACK,
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.sv_usrstack = AOUT32_USRSTACK,
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.sv_psstrings = AOUT32_PS_STRINGS,
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.sv_psstringssz = sizeof(struct freebsd32_ps_strings),
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = freebsd32_copyout_strings,
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.sv_setregs = ia32_setregs,
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.sv_fixlimit = ia32_fixlimit,
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.sv_maxssiz = &ia32_maxssiz,
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.sv_flags = SV_ABI_FREEBSD | SV_AOUT | SV_IA32 | SV_ILP32,
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.sv_set_syscall_retval = ia32_set_syscall_retval,
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.sv_fetch_syscall_args = ia32_fetch_syscall_args,
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.sv_syscallnames = freebsd32_syscallnames,
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.sv_onexec_old = exec_onexec_old,
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.sv_onexit = exit_onexit,
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.sv_set_fork_retval = x86_set_fork_retval,
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};
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static void
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aout_sysent(void *arg __unused)
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{
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aout_szsigcode = (int)(uintptr_t)&_binary_elf_vdso32_so_1_size;
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}
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SYSINIT(aout_sysent, SI_SUB_EXEC, SI_ORDER_ANY, aout_sysent, NULL);
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#else
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#error "Only ia32 arch is supported"
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#endif
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static int
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aout_fixup(uintptr_t *stack_base, struct image_params *imgp)
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{
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*stack_base -= sizeof(uint32_t);
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if (suword32((void *)*stack_base, imgp->args->argc) != 0)
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return (EFAULT);
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return (0);
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}
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static int
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exec_aout_imgact(struct image_params *imgp)
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{
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const struct exec *a_out;
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struct vmspace *vmspace;
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vm_map_t map;
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vm_object_t object;
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vm_offset_t text_end, data_end;
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unsigned long virtual_offset;
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unsigned long file_offset;
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unsigned long bss_size;
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int error;
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a_out = (const struct exec *)imgp->image_header;
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/*
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* Linux and *BSD binaries look very much alike,
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* only the machine id is different:
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* 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
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* NetBSD is in network byte order.. ugh.
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*/
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if (((a_out->a_midmag >> 16) & 0xff) != 0x86 &&
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((a_out->a_midmag >> 16) & 0xff) != 0 &&
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((((int)ntohl(a_out->a_midmag)) >> 16) & 0xff) != 0x86)
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return (-1);
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/*
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* Set file/virtual offset based on a.out variant.
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* We do two cases: host byte order and network byte order
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* (for NetBSD compatibility)
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*/
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switch ((int)(a_out->a_midmag & 0xffff)) {
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case ZMAGIC:
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virtual_offset = 0;
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if (a_out->a_text) {
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file_offset = PAGE_SIZE;
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} else {
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/* Bill's "screwball mode" */
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file_offset = 0;
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}
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break;
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case QMAGIC:
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virtual_offset = PAGE_SIZE;
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file_offset = 0;
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/* Pass PS_STRINGS for BSD/OS binaries only. */
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if (N_GETMID(*a_out) == MID_ZERO)
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imgp->ps_strings = (void *)aout_sysvec.sv_psstrings;
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break;
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default:
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/* NetBSD compatibility */
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switch ((int)(ntohl(a_out->a_midmag) & 0xffff)) {
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case ZMAGIC:
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case QMAGIC:
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virtual_offset = PAGE_SIZE;
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file_offset = 0;
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break;
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default:
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return (-1);
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}
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}
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bss_size = roundup(a_out->a_bss, PAGE_SIZE);
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/*
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* Check various fields in header for validity/bounds.
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*/
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if (/* entry point must lay with text region */
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a_out->a_entry < virtual_offset ||
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a_out->a_entry >= virtual_offset + a_out->a_text ||
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/* text and data size must each be page rounded */
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a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK
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#ifdef __amd64__
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||
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/* overflows */
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virtual_offset + a_out->a_text + a_out->a_data + bss_size > UINT_MAX
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#endif
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)
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return (-1);
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/* text + data can't exceed file size */
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if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
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return (EFAULT);
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/*
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* text/data/bss must not exceed limits
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*/
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PROC_LOCK(imgp->proc);
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if (/* text can't exceed maximum text size */
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a_out->a_text > maxtsiz ||
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/* data + bss can't exceed rlimit */
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a_out->a_data + bss_size > lim_cur_proc(imgp->proc, RLIMIT_DATA) ||
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racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {
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PROC_UNLOCK(imgp->proc);
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return (ENOMEM);
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}
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PROC_UNLOCK(imgp->proc);
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/*
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* Avoid a possible deadlock if the current address space is destroyed
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* and that address space maps the locked vnode. In the common case,
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* the locked vnode's v_usecount is decremented but remains greater
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* than zero. Consequently, the vnode lock is not needed by vrele().
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* However, in cases where the vnode lock is external, such as nullfs,
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* v_usecount may become zero.
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*/
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VOP_UNLOCK(imgp->vp);
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/*
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* Destroy old process VM and create a new one (with a new stack)
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*/
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error = exec_new_vmspace(imgp, &aout_sysvec);
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vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
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if (error)
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return (error);
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/*
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* The vm space can be changed by exec_new_vmspace
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*/
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vmspace = imgp->proc->p_vmspace;
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object = imgp->object;
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map = &vmspace->vm_map;
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vm_map_lock(map);
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vm_object_reference(object);
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text_end = virtual_offset + a_out->a_text;
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error = vm_map_insert(map, object,
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file_offset,
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virtual_offset, text_end,
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VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
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MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_VN_EXEC);
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if (error) {
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vm_map_unlock(map);
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vm_object_deallocate(object);
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return (error);
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}
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VOP_SET_TEXT_CHECKED(imgp->vp);
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data_end = text_end + a_out->a_data;
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if (a_out->a_data) {
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vm_object_reference(object);
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error = vm_map_insert(map, object,
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file_offset + a_out->a_text,
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text_end, data_end,
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VM_PROT_ALL, VM_PROT_ALL,
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MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_VN_EXEC);
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if (error) {
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vm_map_unlock(map);
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vm_object_deallocate(object);
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return (error);
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}
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VOP_SET_TEXT_CHECKED(imgp->vp);
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}
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if (bss_size) {
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error = vm_map_insert(map, NULL, 0,
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data_end, data_end + bss_size,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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if (error) {
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vm_map_unlock(map);
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return (error);
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}
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}
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vm_map_unlock(map);
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/* Fill in process VM information */
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vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
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vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
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vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
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vmspace->vm_daddr = (caddr_t) (uintptr_t)
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(virtual_offset + a_out->a_text);
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error = exec_map_stack(imgp);
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if (error != 0)
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return (error);
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/* Fill in image_params */
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imgp->interpreted = 0;
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imgp->entry_addr = a_out->a_entry;
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imgp->proc->p_sysent = &aout_sysvec;
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return (0);
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}
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/*
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* Tell kern_execve.c about it, with a little help from the linker.
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*/
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static struct execsw aout_execsw = {
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.ex_imgact = exec_aout_imgact,
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.ex_name = "a.out"
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};
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EXEC_SET(aout, aout_execsw);
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