65bbec73d7
- excise some unused code (#if 0'd out - don't want to nuke it yet) - fix problems with "make depend" - some macros were screwing it up - get rid of some static local variables There still seems to be a small reentrancy problem somewhere.
291 lines
7.3 KiB
C
291 lines
7.3 KiB
C
/*
|
|
* Parts of this file are not covered by:
|
|
* ----------------------------------------------------------------------------
|
|
* "THE BEER-WARE LICENSE" (Revision 42):
|
|
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
|
|
* can do whatever you want with this stuff. If we meet some day, and you think
|
|
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
|
|
* ----------------------------------------------------------------------------
|
|
*
|
|
* $Id: imgact_gzip.c,v 1.7 1994/10/07 22:26:51 csgr Exp $
|
|
*
|
|
* This module handles execution of a.out files which have been run through
|
|
* "gzip -9".
|
|
*
|
|
* For now you need to use exactly this command to compress the binaries:
|
|
*
|
|
* gzip -9 -v < /bin/sh > /tmp/sh
|
|
*
|
|
* TODO:
|
|
* text-segments should be made R/O after being filled
|
|
* is the vm-stuff safe ?
|
|
* should handle the entire header of gzip'ed stuff.
|
|
* inflate isn't quite reentrant yet...
|
|
* error-handling is a mess...
|
|
* so is the rest...
|
|
* tidy up unnecesary includes
|
|
*/
|
|
|
|
|
|
#include <sys/param.h> /* some header file needs this first foo! */
|
|
|
|
#include <sys/exec.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/imgact_aout.h>
|
|
#include <sys/inflate.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_kern.h>
|
|
|
|
extern struct sysentvec aout_sysvec;
|
|
|
|
int
|
|
exec_gzip_imgact(iparams)
|
|
struct image_params *iparams;
|
|
{
|
|
int error,error2=0;
|
|
u_char *p = (u_char *) iparams->image_header;
|
|
struct gzip *gz;
|
|
struct gz_global gz_glbl;
|
|
|
|
/* If these four are not OK, it isn't a gzip file */
|
|
if (p[0] != 0x1f) return -1; /* 0 Simply magic */
|
|
if (p[1] != 0x8b) return -1; /* 1 Simply magic */
|
|
if (p[2] != 0x08) return -1; /* 2 Compression method */
|
|
if (p[9] != 0x03) return -1; /* 9 OS compressed on */
|
|
|
|
/* If this one contains anything but a comment or a filename
|
|
* marker, we don't want to chew on it
|
|
*/
|
|
if (p[3] & ~(0x18)) return ENOEXEC; /* 3 Flags */
|
|
|
|
/* These are of no use to us */
|
|
/* 4-7 Timestamp */
|
|
/* 8 Extra flags */
|
|
|
|
gz = malloc(sizeof *gz,M_GZIP,M_NOWAIT);
|
|
if (!gz)
|
|
return ENOMEM;
|
|
bzero(gz,sizeof *gz); /* waste of time ? */
|
|
|
|
gz->gz_slide = malloc(WSIZE,M_TEMP,M_NOWAIT);
|
|
if (!gz->gz_slide) {
|
|
free(gz,M_GZIP);
|
|
return ENOMEM;
|
|
}
|
|
|
|
gz->ip = iparams;
|
|
gz->error = ENOEXEC;
|
|
gz->idx = 10;
|
|
|
|
if (p[3] & 0x08) { /* skip a filename */
|
|
while (p[gz->idx++])
|
|
if (gz->idx >= PAGE_SIZE)
|
|
goto done;
|
|
}
|
|
|
|
if (p[3] & 0x10) { /* skip a comment */
|
|
while (p[gz->idx++])
|
|
if (gz->idx >= PAGE_SIZE)
|
|
goto done;
|
|
}
|
|
|
|
gz->len = gz->ip->attr->va_size;
|
|
|
|
gz->error = 0;
|
|
|
|
error = inflate(gz, &gz_glbl);
|
|
|
|
if (gz->inbuf) {
|
|
error2 =
|
|
vm_deallocate(kernel_map, (vm_offset_t)gz->inbuf, PAGE_SIZE);
|
|
}
|
|
|
|
if (gz->error || error || error2) {
|
|
printf("Output=%lu ",gz->output);
|
|
printf("Inflate_error=%d gz->error=%d error2=%d where=%d\n",
|
|
error,gz->error,error2,gz->where);
|
|
if (gz->error)
|
|
goto done;
|
|
if (error) {
|
|
gz->error = ENOEXEC;
|
|
goto done;
|
|
}
|
|
if (error2) {
|
|
gz->error = error2;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
error = gz->error;
|
|
free(gz->gz_slide,M_TEMP);
|
|
free(gz,M_GZIP);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
do_aout_hdr(struct gzip *gz)
|
|
{
|
|
int error;
|
|
struct vmspace *vmspace = gz->ip->proc->p_vmspace;
|
|
u_long vmaddr;
|
|
|
|
/*
|
|
* 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)(gz->a_out.a_magic & 0xffff)) {
|
|
case ZMAGIC:
|
|
gz->virtual_offset = 0;
|
|
if (gz->a_out.a_text) {
|
|
gz->file_offset = NBPG;
|
|
} else {
|
|
/* Bill's "screwball mode" */
|
|
gz->file_offset = 0;
|
|
}
|
|
break;
|
|
case QMAGIC:
|
|
gz->virtual_offset = NBPG;
|
|
gz->file_offset = 0;
|
|
break;
|
|
default:
|
|
/* NetBSD compatibility */
|
|
switch ((int)(ntohl(gz->a_out.a_magic) & 0xffff)) {
|
|
case ZMAGIC:
|
|
case QMAGIC:
|
|
gz->virtual_offset = NBPG;
|
|
gz->file_offset = 0;
|
|
break;
|
|
default:
|
|
gz->where = __LINE__;
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
gz->bss_size = roundup(gz->a_out.a_bss, NBPG);
|
|
|
|
/*
|
|
* Check various fields in header for validity/bounds.
|
|
*/
|
|
if (/* entry point must lay with text region */
|
|
gz->a_out.a_entry < gz->virtual_offset ||
|
|
gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text ||
|
|
|
|
/* text and data size must each be page rounded */
|
|
gz->a_out.a_text % NBPG ||
|
|
gz->a_out.a_data % NBPG) {
|
|
gz->where = __LINE__;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* text/data/bss must not exceed limits
|
|
*/
|
|
if (/* text can't exceed maximum text size */
|
|
gz->a_out.a_text > MAXTSIZ ||
|
|
|
|
/* data + bss can't exceed maximum data size */
|
|
gz->a_out.a_data + gz->bss_size > MAXDSIZ ||
|
|
|
|
/* data + bss can't exceed rlimit */
|
|
gz->a_out.a_data + gz->bss_size >
|
|
gz->ip->proc->p_rlimit[RLIMIT_DATA].rlim_cur) {
|
|
gz->where = __LINE__;
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/* Find out how far we should go */
|
|
gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data;
|
|
|
|
/* copy in arguments and/or environment from old process */
|
|
error = exec_extract_strings(gz->ip);
|
|
if (error) {
|
|
gz->where = __LINE__;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Destroy old process VM and create a new one (with a new stack)
|
|
*/
|
|
exec_new_vmspace(gz->ip);
|
|
|
|
vmaddr = gz->virtual_offset;
|
|
|
|
error = vm_mmap(&vmspace->vm_map, /* map */
|
|
&vmaddr, /* address */
|
|
gz->a_out.a_text, /* size */
|
|
VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* protection */
|
|
VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE,
|
|
MAP_ANON | MAP_FIXED, /* flags */
|
|
0, /* vnode */
|
|
0); /* offset */
|
|
|
|
if (error) {
|
|
gz->where = __LINE__;
|
|
return (error);
|
|
}
|
|
|
|
vmaddr = gz->virtual_offset + gz->a_out.a_text;
|
|
|
|
/*
|
|
* Map data read/write (if text is 0, assume text is in data area
|
|
* [Bill's screwball mode])
|
|
*/
|
|
|
|
error = vm_mmap(&vmspace->vm_map,
|
|
&vmaddr,
|
|
gz->a_out.a_data,
|
|
VM_PROT_READ | VM_PROT_WRITE | (gz->a_out.a_text ? 0 : VM_PROT_EXECUTE),
|
|
VM_PROT_ALL, MAP_ANON | MAP_FIXED,
|
|
0,
|
|
0);
|
|
|
|
if (error) {
|
|
gz->where = __LINE__;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Allocate demand-zeroed area for uninitialized data
|
|
* "bss" = 'block started by symbol' - named after the IBM 7090
|
|
* instruction of the same name.
|
|
*/
|
|
vmaddr = gz->virtual_offset + gz->a_out.a_text + gz->a_out.a_data;
|
|
error = vm_allocate(&vmspace->vm_map, &vmaddr, gz->bss_size, FALSE);
|
|
if (error) {
|
|
gz->where = __LINE__;
|
|
return (error);
|
|
}
|
|
|
|
/* Fill in process VM information */
|
|
vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT;
|
|
vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT;
|
|
vmspace->vm_taddr = (caddr_t) gz->virtual_offset;
|
|
vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text;
|
|
|
|
/* Fill in image_params */
|
|
gz->ip->interpreted = 0;
|
|
gz->ip->entry_addr = gz->a_out.a_entry;
|
|
|
|
gz->ip->proc->p_sysent = &aout_sysvec;
|
|
|
|
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 gzip_execsw = { exec_gzip_imgact, "gzip" };
|
|
TEXT_SET(execsw_set, gzip_execsw);
|
|
|