diff options
Diffstat (limited to 'sys/kern/imgact_aout.c')
| -rw-r--r-- | sys/kern/imgact_aout.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c new file mode 100644 index 0000000..71311eb --- /dev/null +++ b/sys/kern/imgact_aout.c @@ -0,0 +1,210 @@ +/* + * 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_rlimit.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/resourcevar.h> +#include <sys/exec.h> +#include <sys/mman.h> +#include <sys/imgact.h> +#include <sys/imgact_aout.h> +#include <sys/kernel.h> +#include <sys/proc.h> +#include <sys/sysent.h> +#include <sys/vnode.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/vm_prot.h> +#include <vm/lock.h> +#include <vm/pmap.h> +#include <vm/vm_map.h> +#include <vm/vm_extern.h> + +static int exec_aout_imgact __P((struct image_params *imgp)); + +static int +exec_aout_imgact(imgp) + struct image_params *imgp; +{ + const struct exec *a_out = (const struct exec *) imgp->image_header; + struct vmspace *vmspace = imgp->proc->p_vmspace; + vm_offset_t vmaddr; + unsigned long virtual_offset; + unsigned long file_offset; + unsigned long bss_size; + int error; + + /* + * 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; + 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 + */ + if (/* text can't exceed maximum text size */ + a_out->a_text > MAXTSIZ || + + /* data + bss can't exceed maximum data size */ + a_out->a_data + bss_size > MAXDSIZ || + + /* 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); + + /* + * Map text/data read/execute + */ + vmaddr = virtual_offset; + error = + vm_mmap(&vmspace->vm_map, /* map */ + &vmaddr, /* address */ + a_out->a_text + a_out->a_data, /* size */ + VM_PROT_READ | VM_PROT_EXECUTE, /* protection */ + VM_PROT_ALL, /* max protection */ + MAP_PRIVATE | MAP_FIXED, /* flags */ + (caddr_t)imgp->vp, /* vnode */ + file_offset); /* offset */ + if (error) + return (error); + + /* + * allow writing of data + */ + vm_map_protect(&vmspace->vm_map, + vmaddr + a_out->a_text, + vmaddr + a_out->a_text + a_out->a_data, + VM_PROT_ALL, + FALSE); + + if (bss_size != 0) { + /* + * Allocate demand-zeroed area for uninitialized data + * "bss" = 'block started by symbol' - named after the IBM 7090 + * instruction of the same name. + */ + vmaddr = virtual_offset + a_out->a_text + a_out->a_data; + error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); + if (error) + return (error); + } + + /* 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) virtual_offset; + vmspace->vm_daddr = (caddr_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); +} + +/* + * Tell kern_execve.c about it, with a little help from the linker. + * Since `const' objects end up in the text segment, TEXT_SET is the + * correct directive to use. + */ +static const struct execsw aout_execsw = { exec_aout_imgact, "a.out" }; +TEXT_SET(execsw_set, aout_execsw); |
