diff options
Diffstat (limited to 'sys/kern/imgact_aout.c')
| -rw-r--r-- | sys/kern/imgact_aout.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c new file mode 100644 index 0000000..41ae8cf --- /dev/null +++ b/sys/kern/imgact_aout.c @@ -0,0 +1,289 @@ +/* + * Copyright (c) 1993, David Greenman + * All rights reserved. + * + * 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. + * + * $FreeBSD$ + */ + +#include "opt_kstack_pages.h" + +#include <sys/param.h> +#include <sys/exec.h> +#include <sys/fcntl.h> +#include <sys/imgact.h> +#include <sys/imgact_aout.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/namei.h> +#include <sys/pioctl.h> +#include <sys/proc.h> +#include <sys/resourcevar.h> +#include <sys/systm.h> +#include <sys/signalvar.h> +#include <sys/stat.h> +#include <sys/sysent.h> +#include <sys/syscall.h> +#include <sys/vnode.h> +#include <sys/user.h> + +#include <machine/md_var.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> +#include <vm/vm_map.h> +#include <vm/vm_object.h> + +static int exec_aout_imgact(struct image_params *imgp); + +struct sysentvec aout_sysvec = { + SYS_MAXSYSCALL, + sysent, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + sendsig, + sigcode, + &szsigcode, + 0, + "FreeBSD a.out", + aout_coredump, + NULL, + MINSIGSTKSZ +}; + +static int +exec_aout_imgact(imgp) + struct image_params *imgp; +{ + const struct exec *a_out = (const struct exec *) imgp->image_header; + struct vmspace *vmspace; + struct vnode *vp; + vm_map_t map; + vm_object_t object; + vm_offset_t text_end, data_end; + unsigned long virtual_offset; + unsigned long file_offset; + unsigned long bss_size; + int error; + + GIANT_REQUIRED; + + /* + * Linux and *BSD binaries look very much alike, + * only the machine id is different: + * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI. + * NetBSD is in network byte order.. ugh. + */ + if (((a_out->a_magic >> 16) & 0xff) != 0x86 && + ((a_out->a_magic >> 16) & 0xff) != 0 && + ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86) + return -1; + + /* + * Set file/virtual offset based on a.out variant. + * We do two cases: host byte order and network byte order + * (for NetBSD compatibility) + */ + switch ((int)(a_out->a_magic & 0xffff)) { + case ZMAGIC: + virtual_offset = 0; + if (a_out->a_text) { + file_offset = PAGE_SIZE; + } else { + /* Bill's "screwball mode" */ + file_offset = 0; + } + break; + case QMAGIC: + virtual_offset = PAGE_SIZE; + file_offset = 0; + /* Pass PS_STRINGS for BSD/OS binaries only. */ + if (N_GETMID(*a_out) == MID_ZERO) + imgp->ps_strings = PS_STRINGS; + break; + default: + /* NetBSD compatibility */ + switch ((int)(ntohl(a_out->a_magic) & 0xffff)) { + case ZMAGIC: + case QMAGIC: + virtual_offset = PAGE_SIZE; + file_offset = 0; + break; + default: + return (-1); + } + } + + bss_size = roundup(a_out->a_bss, PAGE_SIZE); + + /* + * Check various fields in header for validity/bounds. + */ + if (/* entry point must lay with text region */ + a_out->a_entry < virtual_offset || + a_out->a_entry >= virtual_offset + a_out->a_text || + + /* text and data size must each be page rounded */ + a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) + return (-1); + + /* text + data can't exceed file size */ + if (a_out->a_data + a_out->a_text > imgp->attr->va_size) + return (EFAULT); + + /* + * text/data/bss must not exceed limits + */ + mtx_assert(&Giant, MA_OWNED); + if (/* text can't exceed maximum text size */ + a_out->a_text > maxtsiz || + + /* data + bss can't exceed rlimit */ + a_out->a_data + bss_size > + imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur) + return (ENOMEM); + + /* copy in arguments and/or environment from old process */ + error = exec_extract_strings(imgp); + if (error) + return (error); + + /* + * Destroy old process VM and create a new one (with a new stack) + */ + exec_new_vmspace(imgp); + + /* + * The vm space can be changed by exec_new_vmspace + */ + vmspace = imgp->proc->p_vmspace; + + vp = imgp->vp; + map = &vmspace->vm_map; + vm_map_lock(map); + VOP_GETVOBJECT(vp, &object); + vm_object_reference(object); + + text_end = virtual_offset + a_out->a_text; + error = vm_map_insert(map, object, + file_offset, + virtual_offset, text_end, + VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL, + MAP_COPY_ON_WRITE | MAP_PREFAULT); + if (error) { + vm_map_unlock(map); + return (error); + } + data_end = text_end + a_out->a_data; + if (a_out->a_data) { + vm_object_reference(object); + error = vm_map_insert(map, object, + file_offset + a_out->a_text, + text_end, data_end, + VM_PROT_ALL, VM_PROT_ALL, + MAP_COPY_ON_WRITE | MAP_PREFAULT); + if (error) { + vm_map_unlock(map); + return (error); + } + } + + if (bss_size) { + error = vm_map_insert(map, NULL, 0, + data_end, data_end + bss_size, + VM_PROT_ALL, VM_PROT_ALL, 0); + if (error) { + vm_map_unlock(map); + return (error); + } + } + vm_map_unlock(map); + + /* Fill in process VM information */ + vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; + vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; + vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset; + vmspace->vm_daddr = (caddr_t) (uintptr_t) + (virtual_offset + a_out->a_text); + + /* Fill in image_params */ + imgp->interpreted = 0; + imgp->entry_addr = a_out->a_entry; + + imgp->proc->p_sysent = &aout_sysvec; + + /* Indicate that this file should not be modified */ + imgp->vp->v_flag |= VTEXT; + + return (0); +} + +/* + * Dump core, into a file named as described in the comments for + * expand_name(), unless the process was setuid/setgid. + */ +int +aout_coredump(td, vp, limit) + register struct thread *td; + register struct vnode *vp; + off_t limit; +{ + struct proc *p = td->td_proc; + register struct ucred *cred = td->td_ucred; + register struct vmspace *vm = p->p_vmspace; + int error; + + if (ctob((UAREA_PAGES + KSTACK_PAGES) + + vm->vm_dsize + vm->vm_ssize) >= limit) + return (EFAULT); + PROC_LOCK(p); + fill_kinfo_proc(p, &p->p_uarea->u_kproc); + PROC_UNLOCK(p); + error = cpu_coredump(td, vp, cred); + if (error == 0) + error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr, + (int)ctob(vm->vm_dsize), + (off_t)ctob(UAREA_PAGES + KSTACK_PAGES), UIO_USERSPACE, + IO_UNIT | IO_DIRECT, cred, (int *) NULL, td); + if (error == 0) + error = vn_rdwr_inchunks(UIO_WRITE, vp, + (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)), + round_page(ctob(vm->vm_ssize)), + (off_t)ctob(UAREA_PAGES + KSTACK_PAGES) + + ctob(vm->vm_dsize), UIO_USERSPACE, + IO_UNIT | IO_DIRECT, cred, (int *) NULL, td); + return (error); +} + +/* + * Tell kern_execve.c about it, with a little help from the linker. + */ +static struct execsw aout_execsw = { exec_aout_imgact, "a.out" }; +EXEC_SET(aout, aout_execsw); |
