2005-01-06 23:35:40 +00:00
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/*-
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2017-11-30 20:33:45 +00:00
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* SPDX-License-Identifier: Beerware
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*
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1994-10-03 05:23:01 +00:00
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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2002-03-25 13:52:45 +00:00
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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1994-10-03 05:23:01 +00:00
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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2005-01-06 23:35:40 +00:00
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*/
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/*
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1994-10-03 05:23:01 +00:00
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* This module handles execution of a.out files which have been run through
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1994-10-22 11:40:38 +00:00
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* "gzip". This saves diskspace, but wastes cpu-cycles and VM.
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1994-10-03 05:23:01 +00:00
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*
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* TODO:
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* text-segments should be made R/O after being filled
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* is the vm-stuff safe ?
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* should handle the entire header of gzip'ed stuff.
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* inflate isn't quite reentrant yet...
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* error-handling is a mess...
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* so is the rest...
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2013-04-17 11:42:40 +00:00
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* tidy up unnecessary includes
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1994-10-03 05:23:01 +00:00
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*/
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2003-06-11 00:56:59 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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1994-10-22 11:40:38 +00:00
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#include <sys/param.h>
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1994-10-03 05:23:01 +00:00
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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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2001-05-01 08:13:21 +00:00
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#include <sys/lock.h>
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1994-10-11 11:29:17 +00:00
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#include <sys/mman.h>
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2001-05-01 08:13:21 +00:00
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#include <sys/mutex.h>
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1996-05-01 02:43:13 +00:00
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#include <sys/proc.h>
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2011-04-05 20:23:59 +00:00
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#include <sys/racct.h>
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1994-10-11 11:29:17 +00:00
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#include <sys/resourcevar.h>
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1994-10-03 05:23:01 +00:00
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#include <sys/sysent.h>
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1994-10-11 11:29:17 +00:00
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#include <sys/systm.h>
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1996-05-01 02:43:13 +00:00
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#include <sys/vnode.h>
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1994-10-22 11:40:38 +00:00
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#include <sys/inflate.h>
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1994-10-03 05:23:01 +00:00
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#include <vm/vm.h>
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1995-12-07 12:48:31 +00:00
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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1994-10-03 05:23:01 +00:00
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#include <vm/vm_kern.h>
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1995-12-07 12:48:31 +00:00
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#include <vm/vm_extern.h>
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1994-10-03 05:23:01 +00:00
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1994-10-22 11:40:38 +00:00
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struct imgact_gzip {
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struct image_params *ip;
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struct exec a_out;
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int error;
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1999-06-21 16:23:13 +00:00
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int gotheader;
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1994-10-22 11:40:38 +00:00
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int where;
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u_char *inbuf;
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u_long offset;
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u_long output;
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u_long len;
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int idx;
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u_long virtual_offset, file_offset, file_end, bss_size;
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};
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2002-03-19 21:25:46 +00:00
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static int exec_gzip_imgact(struct image_params *imgp);
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static int NextByte(void *vp);
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static int do_aout_hdr(struct imgact_gzip *);
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static int Flush(void *vp, u_char *, u_long siz);
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1994-10-22 11:40:38 +00:00
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1995-12-02 16:32:03 +00:00
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static int
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2018-03-12 15:45:50 +00:00
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exec_gzip_imgact(struct image_params *imgp)
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1994-10-03 05:23:01 +00:00
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{
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2012-02-17 23:47:16 +00:00
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int error;
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1996-08-31 16:52:44 +00:00
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const u_char *p = (const u_char *) imgp->image_header;
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1994-10-22 11:40:38 +00:00
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struct imgact_gzip igz;
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struct inflate infl;
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1996-08-01 22:00:14 +00:00
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struct vmspace *vmspace;
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1994-10-03 05:23:01 +00:00
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1994-10-04 03:09:13 +00:00
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/* If these four are not OK, it isn't a gzip file */
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1994-10-22 11:40:38 +00:00
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if (p[0] != 0x1f)
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return -1; /* 0 Simply magic */
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if (p[1] != 0x8b)
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return -1; /* 1 Simply magic */
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if (p[2] != 0x08)
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return -1; /* 2 Compression method */
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if (p[9] != 0x03)
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return -1; /* 9 OS compressed on */
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/*
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* If this one contains anything but a comment or a filename marker,
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* we don't want to chew on it
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1994-10-04 03:09:13 +00:00
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*/
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1994-10-22 11:40:38 +00:00
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if (p[3] & ~(0x18))
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return ENOEXEC; /* 3 Flags */
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1994-10-04 03:09:13 +00:00
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/* These are of no use to us */
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1994-10-22 11:40:38 +00:00
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/* 4-7 Timestamp */
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/* 8 Extra flags */
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bzero(&igz, sizeof igz);
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bzero(&infl, sizeof infl);
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infl.gz_private = (void *) &igz;
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infl.gz_input = NextByte;
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infl.gz_output = Flush;
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1995-11-06 12:52:37 +00:00
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igz.ip = imgp;
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1994-10-22 11:40:38 +00:00
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igz.idx = 10;
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if (p[3] & 0x08) { /* skip a filename */
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while (p[igz.idx++])
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if (igz.idx >= PAGE_SIZE)
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return ENOEXEC;
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1994-10-04 03:09:13 +00:00
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}
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1994-10-22 11:40:38 +00:00
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if (p[3] & 0x10) { /* skip a comment */
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while (p[igz.idx++])
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if (igz.idx >= PAGE_SIZE)
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return ENOEXEC;
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1994-10-04 03:09:13 +00:00
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}
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1996-08-01 22:00:14 +00:00
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igz.len = imgp->attr->va_size;
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1994-10-04 03:09:13 +00:00
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1994-10-22 11:40:38 +00:00
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error = inflate(&infl);
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1994-10-04 03:09:13 +00:00
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1999-06-21 16:23:13 +00:00
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/*
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* The unzipped file may not even have been long enough to contain
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* a header giving Flush() a chance to return error. Check for this.
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*/
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if ( !igz.gotheader )
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return ENOEXEC;
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1996-08-01 22:00:14 +00:00
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if ( !error ) {
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vmspace = imgp->proc->p_vmspace;
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error = vm_map_protect(&vmspace->vm_map,
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(vm_offset_t) vmspace->vm_taddr,
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(vm_offset_t) (vmspace->vm_taddr +
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(vmspace->vm_tsize << PAGE_SHIFT)) ,
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VM_PROT_READ|VM_PROT_EXECUTE,0);
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}
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2012-02-17 23:47:16 +00:00
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if (igz.inbuf)
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2013-08-07 06:21:20 +00:00
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kmap_free_wakeup(exec_map, (vm_offset_t)igz.inbuf, PAGE_SIZE);
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2012-02-17 23:47:16 +00:00
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if (igz.error || error) {
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1994-10-22 11:40:38 +00:00
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printf("Output=%lu ", igz.output);
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2012-02-17 23:47:16 +00:00
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printf("Inflate_error=%d igz.error=%d where=%d\n",
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error, igz.error, igz.where);
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1994-10-04 03:09:13 +00:00
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}
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1994-10-22 11:40:38 +00:00
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if (igz.error)
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return igz.error;
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if (error)
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return ENOEXEC;
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return 0;
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1994-10-03 05:23:01 +00:00
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}
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1994-10-22 11:40:38 +00:00
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static int
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do_aout_hdr(struct imgact_gzip * gz)
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1994-10-03 05:23:01 +00:00
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{
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1994-10-22 11:40:38 +00:00
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int error;
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1997-04-13 01:48:35 +00:00
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struct vmspace *vmspace;
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1996-03-19 15:03:00 +00:00
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vm_offset_t vmaddr;
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1994-10-22 11:40:38 +00:00
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/*
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* Set file/virtual offset based on a.out variant. We do two cases:
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* host byte order and network byte order (for NetBSD compatibility)
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*/
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2012-06-28 07:33:43 +00:00
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switch ((int) (gz->a_out.a_midmag & 0xffff)) {
|
1994-10-03 05:23:01 +00:00
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case ZMAGIC:
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1994-10-22 11:40:38 +00:00
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gz->virtual_offset = 0;
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if (gz->a_out.a_text) {
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1996-05-02 10:43:17 +00:00
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gz->file_offset = PAGE_SIZE;
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1994-10-22 11:40:38 +00:00
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} else {
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/* Bill's "screwball mode" */
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gz->file_offset = 0;
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}
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break;
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1994-10-03 05:23:01 +00:00
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case QMAGIC:
|
1996-05-02 10:43:17 +00:00
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gz->virtual_offset = PAGE_SIZE;
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1994-10-22 11:40:38 +00:00
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gz->file_offset = 0;
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break;
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1994-10-03 05:23:01 +00:00
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default:
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1994-10-22 11:40:38 +00:00
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/* NetBSD compatibility */
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2012-06-28 07:33:43 +00:00
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switch ((int) (ntohl(gz->a_out.a_midmag) & 0xffff)) {
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1994-10-22 11:40:38 +00:00
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case ZMAGIC:
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case QMAGIC:
|
1996-05-02 10:43:17 +00:00
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gz->virtual_offset = PAGE_SIZE;
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1994-10-22 11:40:38 +00:00
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gz->file_offset = 0;
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break;
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default:
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gz->where = __LINE__;
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return (-1);
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}
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1994-10-03 05:23:01 +00:00
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}
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1996-05-02 10:43:17 +00:00
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gz->bss_size = roundup(gz->a_out.a_bss, PAGE_SIZE);
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1994-10-03 05:23:01 +00:00
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1994-10-22 11:40:38 +00:00
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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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gz->a_out.a_entry < gz->virtual_offset ||
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gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text ||
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1994-10-03 05:23:01 +00:00
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/* text and data size must each be page rounded */
|
1996-05-02 10:43:17 +00:00
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gz->a_out.a_text & PAGE_MASK || gz->a_out.a_data & PAGE_MASK) {
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1994-10-22 11:40:38 +00:00
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gz->where = __LINE__;
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return (-1);
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}
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/*
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* text/data/bss must not exceed limits
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*/
|
2004-02-04 21:52:57 +00:00
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PROC_LOCK(gz->ip->proc);
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1994-10-22 11:40:38 +00:00
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if ( /* text can't exceed maximum text size */
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2001-10-10 23:06:54 +00:00
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gz->a_out.a_text > maxtsiz ||
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1994-10-03 05:23:01 +00:00
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/* data + bss can't exceed rlimit */
|
1994-10-22 11:40:38 +00:00
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gz->a_out.a_data + gz->bss_size >
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2015-06-10 10:48:12 +00:00
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lim_cur_proc(gz->ip->proc, RLIMIT_DATA) ||
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2011-04-05 20:23:59 +00:00
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racct_set(gz->ip->proc, RACCT_DATA,
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gz->a_out.a_data + gz->bss_size) != 0) {
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2004-02-04 21:52:57 +00:00
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PROC_UNLOCK(gz->ip->proc);
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1994-10-22 11:40:38 +00:00
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gz->where = __LINE__;
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return (ENOMEM);
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}
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2004-02-04 21:52:57 +00:00
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PROC_UNLOCK(gz->ip->proc);
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1994-10-22 11:40:38 +00:00
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/* Find out how far we should go */
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gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data;
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2005-12-24 04:57:50 +00:00
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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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*/
|
2008-01-13 14:44:15 +00:00
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VOP_UNLOCK(gz->ip->vp, 0);
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2005-12-24 04:57:50 +00:00
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1994-10-22 11:40:38 +00:00
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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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*/
|
2007-11-05 11:36:16 +00:00
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error = exec_new_vmspace(gz->ip, &aout_sysvec);
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1994-10-22 11:40:38 +00:00
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2008-01-10 01:10:58 +00:00
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vn_lock(gz->ip->vp, LK_EXCLUSIVE | LK_RETRY);
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2007-11-05 11:36:16 +00:00
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|
if (error) {
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gz->where = __LINE__;
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return (error);
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|
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}
|
2005-12-24 04:57:50 +00:00
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|
1997-04-13 01:48:35 +00:00
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vmspace = gz->ip->proc->p_vmspace;
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1994-10-22 11:40:38 +00:00
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vmaddr = gz->virtual_offset;
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error = vm_mmap(&vmspace->vm_map,
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&vmaddr,
|
1996-08-01 22:00:14 +00:00
|
|
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gz->a_out.a_text + gz->a_out.a_data,
|
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|
|
VM_PROT_ALL, VM_PROT_ALL, MAP_ANON | MAP_FIXED,
|
2005-04-01 20:00:11 +00:00
|
|
|
OBJT_DEFAULT,
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NULL,
|
1994-10-22 11:40:38 +00:00
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0);
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if (error) {
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gz->where = __LINE__;
|
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|
|
return (error);
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|
|
|
}
|
1996-08-01 22:00:14 +00:00
|
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|
|
1995-02-20 22:23:31 +00:00
|
|
|
if (gz->bss_size != 0) {
|
|
|
|
/*
|
1996-02-13 14:16:36 +00:00
|
|
|
* Allocate demand-zeroed area for uninitialized data.
|
|
|
|
* "bss" = 'block started by symbol' - named after the
|
|
|
|
* IBM 7090 instruction of the same name.
|
1995-02-20 22:23:31 +00:00
|
|
|
*/
|
1996-02-13 14:16:36 +00:00
|
|
|
vmaddr = gz->virtual_offset + gz->a_out.a_text +
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|
|
gz->a_out.a_data;
|
2013-09-09 18:11:59 +00:00
|
|
|
error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
|
|
|
|
gz->bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL,
|
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|
|
0);
|
1995-02-20 22:23:31 +00:00
|
|
|
if (error) {
|
|
|
|
gz->where = __LINE__;
|
|
|
|
return (error);
|
|
|
|
}
|
1994-10-22 11:40:38 +00:00
|
|
|
}
|
|
|
|
/* 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;
|
1998-07-15 05:00:26 +00:00
|
|
|
vmspace->vm_taddr = (caddr_t) (uintptr_t) gz->virtual_offset;
|
|
|
|
vmspace->vm_daddr = (caddr_t) (uintptr_t)
|
|
|
|
(gz->virtual_offset + gz->a_out.a_text);
|
1994-10-22 11:40:38 +00:00
|
|
|
|
|
|
|
/* 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
NextByte(void *vp)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
struct imgact_gzip *igz = (struct imgact_gzip *) vp;
|
|
|
|
|
|
|
|
if (igz->idx >= igz->len) {
|
|
|
|
igz->where = __LINE__;
|
|
|
|
return GZ_EOF;
|
|
|
|
}
|
|
|
|
if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) {
|
|
|
|
return igz->inbuf[(igz->idx++) - igz->offset];
|
|
|
|
}
|
2012-02-17 23:47:16 +00:00
|
|
|
if (igz->inbuf)
|
2013-08-07 06:21:20 +00:00
|
|
|
kmap_free_wakeup(exec_map, (vm_offset_t)igz->inbuf, PAGE_SIZE);
|
1995-02-13 07:40:33 +00:00
|
|
|
igz->offset = igz->idx & ~PAGE_MASK;
|
1994-10-22 11:40:38 +00:00
|
|
|
|
2012-02-17 23:47:16 +00:00
|
|
|
error = vm_mmap(exec_map, /* map */
|
1994-10-22 11:40:38 +00:00
|
|
|
(vm_offset_t *) & igz->inbuf, /* address */
|
|
|
|
PAGE_SIZE, /* size */
|
|
|
|
VM_PROT_READ, /* protection */
|
|
|
|
VM_PROT_READ, /* max protection */
|
|
|
|
0, /* flags */
|
2005-04-01 20:00:11 +00:00
|
|
|
OBJT_VNODE, /* handle type */
|
|
|
|
igz->ip->vp, /* vnode */
|
1994-10-22 11:40:38 +00:00
|
|
|
igz->offset); /* offset */
|
|
|
|
if (error) {
|
|
|
|
igz->where = __LINE__;
|
|
|
|
igz->error = error;
|
|
|
|
return GZ_EOF;
|
|
|
|
}
|
|
|
|
return igz->inbuf[(igz->idx++) - igz->offset];
|
1994-10-03 05:23:01 +00:00
|
|
|
}
|
|
|
|
|
1994-10-22 11:40:38 +00:00
|
|
|
static int
|
|
|
|
Flush(void *vp, u_char * ptr, u_long siz)
|
|
|
|
{
|
|
|
|
struct imgact_gzip *gz = (struct imgact_gzip *) vp;
|
|
|
|
u_char *p = ptr, *q;
|
|
|
|
int i;
|
|
|
|
|
2003-01-01 18:49:04 +00:00
|
|
|
/* First, find an a.out-header. */
|
1994-10-22 11:40:38 +00:00
|
|
|
if (gz->output < sizeof gz->a_out) {
|
|
|
|
q = (u_char *) & gz->a_out;
|
|
|
|
i = min(siz, sizeof gz->a_out - gz->output);
|
|
|
|
bcopy(p, q + gz->output, i);
|
|
|
|
gz->output += i;
|
|
|
|
p += i;
|
|
|
|
siz -= i;
|
|
|
|
if (gz->output == sizeof gz->a_out) {
|
1999-06-21 16:23:13 +00:00
|
|
|
gz->gotheader = 1;
|
1994-10-22 11:40:38 +00:00
|
|
|
i = do_aout_hdr(gz);
|
|
|
|
if (i == -1) {
|
1994-10-22 11:55:16 +00:00
|
|
|
if (!gz->where)
|
|
|
|
gz->where = __LINE__;
|
1994-10-22 11:40:38 +00:00
|
|
|
gz->error = ENOEXEC;
|
|
|
|
return ENOEXEC;
|
|
|
|
} else if (i) {
|
|
|
|
gz->where = __LINE__;
|
|
|
|
gz->error = i;
|
|
|
|
return ENOEXEC;
|
|
|
|
}
|
1997-12-14 19:36:24 +00:00
|
|
|
if (gz->file_offset == 0) {
|
1998-07-15 05:00:26 +00:00
|
|
|
q = (u_char *) (uintptr_t) gz->virtual_offset;
|
1998-06-16 14:36:40 +00:00
|
|
|
copyout(&gz->a_out, q, sizeof gz->a_out);
|
1994-10-22 11:40:38 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Skip over zero-padded first PAGE if needed */
|
1998-06-16 14:36:40 +00:00
|
|
|
if (gz->output < gz->file_offset &&
|
|
|
|
gz->output + siz > gz->file_offset) {
|
1994-10-22 11:40:38 +00:00
|
|
|
i = min(siz, gz->file_offset - gz->output);
|
|
|
|
gz->output += i;
|
|
|
|
p += i;
|
|
|
|
siz -= i;
|
|
|
|
}
|
|
|
|
if (gz->output >= gz->file_offset && gz->output < gz->file_end) {
|
|
|
|
i = min(siz, gz->file_end - gz->output);
|
1998-07-15 05:00:26 +00:00
|
|
|
q = (u_char *) (uintptr_t)
|
|
|
|
(gz->virtual_offset + gz->output - gz->file_offset);
|
1998-06-16 14:36:40 +00:00
|
|
|
copyout(p, q, i);
|
1994-10-22 11:40:38 +00:00
|
|
|
gz->output += i;
|
|
|
|
p += i;
|
|
|
|
siz -= i;
|
|
|
|
}
|
|
|
|
gz->output += siz;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
1994-10-03 05:23:01 +00:00
|
|
|
/*
|
|
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
|
|
*/
|
1999-01-29 22:59:43 +00:00
|
|
|
static struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"};
|
1998-10-16 03:55:01 +00:00
|
|
|
EXEC_SET(execgzip, gzip_execsw);
|