bf8e8a6e8f
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
1263 lines
32 KiB
C
1263 lines
32 KiB
C
/*-
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* Copyright (c) 2000 David O'Brien
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* Copyright (c) 1995-1996 Søren Schmidt
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* Copyright (c) 1996 Peter Wemm
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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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* in this position and unchanged.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/fcntl.h>
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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#include <sys/kernel.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/mman.h>
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#include <sys/namei.h>
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#include <sys/pioctl.h>
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#include <sys/proc.h>
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#include <sys/procfs.h>
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#include <sys/resourcevar.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/syscall.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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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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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <machine/elf.h>
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#include <machine/md_var.h>
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#define OLD_EI_BRAND 8
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static int __elfN(check_header)(const Elf_Ehdr *hdr);
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static Elf_Brandinfo *__elfN(get_brandinfo)(const Elf_Ehdr *hdr,
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const char *interp);
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static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
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u_long *entry, size_t pagesize);
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static int __elfN(load_section)(struct proc *p,
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struct vmspace *vmspace, struct vnode *vp, vm_object_t object,
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vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
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vm_prot_t prot, size_t pagesize);
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static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
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SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
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"");
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int __elfN(fallback_brand) = -1;
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SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
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fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
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__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
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TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
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&__elfN(fallback_brand));
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static int elf_trace = 0;
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SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, "");
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static int elf_legacy_coredump = 0;
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SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
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&elf_legacy_coredump, 0, "");
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static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
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int
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__elfN(insert_brand_entry)(Elf_Brandinfo *entry)
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{
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int i;
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for (i = 0; i < MAX_BRANDS; i++) {
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if (elf_brand_list[i] == NULL) {
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elf_brand_list[i] = entry;
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break;
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}
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}
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if (i == MAX_BRANDS)
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return (-1);
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return (0);
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}
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int
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__elfN(remove_brand_entry)(Elf_Brandinfo *entry)
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{
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int i;
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for (i = 0; i < MAX_BRANDS; i++) {
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if (elf_brand_list[i] == entry) {
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elf_brand_list[i] = NULL;
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break;
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}
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}
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if (i == MAX_BRANDS)
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return (-1);
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return (0);
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}
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int
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__elfN(brand_inuse)(Elf_Brandinfo *entry)
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{
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struct proc *p;
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int rval = FALSE;
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sx_slock(&allproc_lock);
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LIST_FOREACH(p, &allproc, p_list) {
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if (p->p_sysent == entry->sysvec) {
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rval = TRUE;
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break;
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}
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}
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sx_sunlock(&allproc_lock);
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return (rval);
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}
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static Elf_Brandinfo *
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__elfN(get_brandinfo)(const Elf_Ehdr *hdr, const char *interp)
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{
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Elf_Brandinfo *bi;
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int i;
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/*
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* We support three types of branding -- (1) the ELF EI_OSABI field
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* that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
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* branding w/in the ELF header, and (3) path of the `interp_path'
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* field. We should also look for an ".note.ABI-tag" ELF section now
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* in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones.
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*/
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/* If the executable has a brand, search for it in the brand list. */
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for (i = 0; i < MAX_BRANDS; i++) {
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bi = elf_brand_list[i];
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if (bi != NULL && hdr->e_machine == bi->machine &&
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(hdr->e_ident[EI_OSABI] == bi->brand ||
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strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
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bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
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return (bi);
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}
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/* Lacking a known brand, search for a recognized interpreter. */
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if (interp != NULL) {
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for (i = 0; i < MAX_BRANDS; i++) {
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bi = elf_brand_list[i];
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if (bi != NULL && hdr->e_machine == bi->machine &&
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strcmp(interp, bi->interp_path) == 0)
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return (bi);
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}
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}
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/* Lacking a recognized interpreter, try the default brand */
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for (i = 0; i < MAX_BRANDS; i++) {
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bi = elf_brand_list[i];
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if (bi != NULL && hdr->e_machine == bi->machine &&
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__elfN(fallback_brand) == bi->brand)
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return (bi);
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}
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return (NULL);
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}
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static int
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__elfN(check_header)(const Elf_Ehdr *hdr)
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{
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Elf_Brandinfo *bi;
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int i;
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if (!IS_ELF(*hdr) ||
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hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
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hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
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hdr->e_ident[EI_VERSION] != EV_CURRENT)
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return (ENOEXEC);
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/*
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* Make sure we have at least one brand for this machine.
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*/
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for (i = 0; i < MAX_BRANDS; i++) {
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bi = elf_brand_list[i];
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if (bi != NULL && bi->machine == hdr->e_machine)
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break;
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}
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if (i == MAX_BRANDS)
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return (ENOEXEC);
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if (hdr->e_version != ELF_TARG_VER)
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return (ENOEXEC);
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return (0);
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}
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static int
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__elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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vm_offset_t start, vm_offset_t end, vm_prot_t prot,
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vm_prot_t max)
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{
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int error, rv;
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vm_offset_t off;
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vm_offset_t data_buf = 0;
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/*
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* Create the page if it doesn't exist yet. Ignore errors.
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*/
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vm_map_lock(map);
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vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), max,
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max, 0);
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vm_map_unlock(map);
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/*
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* Find the page from the underlying object.
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*/
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if (object) {
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vm_object_reference(object);
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rv = vm_map_find(exec_map,
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object,
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trunc_page(offset),
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&data_buf,
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PAGE_SIZE,
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TRUE,
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VM_PROT_READ,
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VM_PROT_ALL,
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MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL);
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if (rv != KERN_SUCCESS) {
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vm_object_deallocate(object);
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return (rv);
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}
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off = offset - trunc_page(offset);
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error = copyout((caddr_t)data_buf + off, (caddr_t)start,
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end - start);
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vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE);
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if (error) {
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return (KERN_FAILURE);
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}
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}
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return (KERN_SUCCESS);
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}
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static int
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__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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vm_offset_t start, vm_offset_t end, vm_prot_t prot,
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vm_prot_t max, int cow)
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{
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int rv;
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if (start != trunc_page(start)) {
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rv = __elfN(map_partial)(map, object, offset, start,
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round_page(start), prot, max);
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if (rv)
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return (rv);
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offset += round_page(start) - start;
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start = round_page(start);
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}
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if (end != round_page(end)) {
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rv = __elfN(map_partial)(map, object, offset +
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trunc_page(end) - start, trunc_page(end), end, prot, max);
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if (rv)
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return (rv);
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end = trunc_page(end);
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}
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if (end > start) {
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if (offset & PAGE_MASK) {
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vm_offset_t data_buf, off;
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vm_size_t sz;
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int error;
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/*
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* The mapping is not page aligned. This means we have
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* to copy the data. Sigh.
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*/
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rv = vm_map_find(map, 0, 0, &start, end - start,
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FALSE, prot, max, 0);
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if (rv)
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return (rv);
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while (start < end) {
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vm_object_reference(object);
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rv = vm_map_find(exec_map,
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object,
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trunc_page(offset),
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&data_buf,
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2 * PAGE_SIZE,
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TRUE,
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VM_PROT_READ,
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VM_PROT_ALL,
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(MAP_COPY_ON_WRITE
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| MAP_PREFAULT_PARTIAL));
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if (rv != KERN_SUCCESS) {
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vm_object_deallocate(object);
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return (rv);
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}
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off = offset - trunc_page(offset);
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sz = end - start;
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if (sz > PAGE_SIZE)
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sz = PAGE_SIZE;
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error = copyout((caddr_t)data_buf + off,
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(caddr_t)start, sz);
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vm_map_remove(exec_map, data_buf,
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data_buf + 2 * PAGE_SIZE);
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if (error) {
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return (KERN_FAILURE);
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}
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start += sz;
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}
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rv = KERN_SUCCESS;
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} else {
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vm_map_lock(map);
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rv = vm_map_insert(map, object, offset, start, end,
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prot, max, cow);
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vm_map_unlock(map);
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}
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return (rv);
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} else {
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return (KERN_SUCCESS);
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}
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}
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static int
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__elfN(load_section)(struct proc *p, struct vmspace *vmspace,
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struct vnode *vp, vm_object_t object, vm_offset_t offset,
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caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
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size_t pagesize)
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{
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size_t map_len;
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vm_offset_t map_addr;
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int error, rv, cow;
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size_t copy_len;
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vm_offset_t file_addr;
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vm_offset_t data_buf = 0;
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GIANT_REQUIRED;
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error = 0;
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/*
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* It's necessary to fail if the filsz + offset taken from the
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* header is greater than the actual file pager object's size.
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* If we were to allow this, then the vm_map_find() below would
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* walk right off the end of the file object and into the ether.
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*
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* While I'm here, might as well check for something else that
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* is invalid: filsz cannot be greater than memsz.
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*/
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if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
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filsz > memsz) {
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uprintf("elf_load_section: truncated ELF file\n");
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return (ENOEXEC);
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}
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#define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
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#define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
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map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
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file_addr = trunc_page_ps(offset, pagesize);
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/*
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* We have two choices. We can either clear the data in the last page
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* of an oversized mapping, or we can start the anon mapping a page
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* early and copy the initialized data into that first page. We
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* choose the second..
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*/
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if (memsz > filsz)
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map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
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else
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map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
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if (map_len != 0) {
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vm_object_reference(object);
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|
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/* cow flags: don't dump readonly sections in core */
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cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
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(prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
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rv = __elfN(map_insert)(&vmspace->vm_map,
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object,
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file_addr, /* file offset */
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map_addr, /* virtual start */
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map_addr + map_len,/* virtual end */
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prot,
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VM_PROT_ALL,
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cow);
|
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if (rv != KERN_SUCCESS) {
|
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vm_object_deallocate(object);
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return (EINVAL);
|
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}
|
|
|
|
/* we can stop now if we've covered it all */
|
|
if (memsz == filsz) {
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return (0);
|
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}
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}
|
|
|
|
|
|
/*
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|
* We have to get the remaining bit of the file into the first part
|
|
* of the oversized map segment. This is normally because the .data
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|
* segment in the file is extended to provide bss. It's a neat idea
|
|
* to try and save a page, but it's a pain in the behind to implement.
|
|
*/
|
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copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
|
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map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
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map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
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map_addr;
|
|
|
|
/* This had damn well better be true! */
|
|
if (map_len != 0) {
|
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rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr,
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map_addr + map_len, VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
if (rv != KERN_SUCCESS) {
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
if (copy_len != 0) {
|
|
vm_offset_t off;
|
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vm_object_reference(object);
|
|
rv = vm_map_find(exec_map,
|
|
object,
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trunc_page(offset + filsz),
|
|
&data_buf,
|
|
PAGE_SIZE,
|
|
TRUE,
|
|
VM_PROT_READ,
|
|
VM_PROT_ALL,
|
|
MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL);
|
|
if (rv != KERN_SUCCESS) {
|
|
vm_object_deallocate(object);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* send the page fragment to user space */
|
|
off = trunc_page_ps(offset + filsz, pagesize) -
|
|
trunc_page(offset + filsz);
|
|
error = copyout((caddr_t)data_buf + off, (caddr_t)map_addr,
|
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copy_len);
|
|
vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE);
|
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if (error) {
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* set it to the specified protection.
|
|
* XXX had better undo the damage from pasting over the cracks here!
|
|
*/
|
|
vm_map_protect(&vmspace->vm_map, trunc_page(map_addr),
|
|
round_page(map_addr + map_len), prot, FALSE);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Load the file "file" into memory. It may be either a shared object
|
|
* or an executable.
|
|
*
|
|
* The "addr" reference parameter is in/out. On entry, it specifies
|
|
* the address where a shared object should be loaded. If the file is
|
|
* an executable, this value is ignored. On exit, "addr" specifies
|
|
* where the file was actually loaded.
|
|
*
|
|
* The "entry" reference parameter is out only. On exit, it specifies
|
|
* the entry point for the loaded file.
|
|
*/
|
|
static int
|
|
__elfN(load_file)(struct proc *p, const char *file, u_long *addr,
|
|
u_long *entry, size_t pagesize)
|
|
{
|
|
struct {
|
|
struct nameidata nd;
|
|
struct vattr attr;
|
|
struct image_params image_params;
|
|
} *tempdata;
|
|
const Elf_Ehdr *hdr = NULL;
|
|
const Elf_Phdr *phdr = NULL;
|
|
struct nameidata *nd;
|
|
struct vmspace *vmspace = p->p_vmspace;
|
|
struct vattr *attr;
|
|
struct image_params *imgp;
|
|
vm_prot_t prot;
|
|
u_long rbase;
|
|
u_long base_addr = 0;
|
|
int error, i, numsegs;
|
|
|
|
if (curthread->td_proc != p)
|
|
panic("elf_load_file - thread"); /* XXXKSE DIAGNOSTIC */
|
|
|
|
tempdata = malloc(sizeof(*tempdata), M_TEMP, 0);
|
|
nd = &tempdata->nd;
|
|
attr = &tempdata->attr;
|
|
imgp = &tempdata->image_params;
|
|
|
|
/*
|
|
* Initialize part of the common data
|
|
*/
|
|
imgp->proc = p;
|
|
imgp->userspace_argv = NULL;
|
|
imgp->userspace_envv = NULL;
|
|
imgp->attr = attr;
|
|
imgp->firstpage = NULL;
|
|
imgp->image_header = (char *)kmem_alloc_wait(exec_map, PAGE_SIZE);
|
|
imgp->object = NULL;
|
|
imgp->execlabel = NULL;
|
|
|
|
if (imgp->image_header == NULL) {
|
|
nd->ni_vp = NULL;
|
|
error = ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
/* XXXKSE */
|
|
NDINIT(nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, curthread);
|
|
|
|
if ((error = namei(nd)) != 0) {
|
|
nd->ni_vp = NULL;
|
|
goto fail;
|
|
}
|
|
NDFREE(nd, NDF_ONLY_PNBUF);
|
|
imgp->vp = nd->ni_vp;
|
|
|
|
/*
|
|
* Check permissions, modes, uid, etc on the file, and "open" it.
|
|
*/
|
|
error = exec_check_permissions(imgp);
|
|
if (error) {
|
|
VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */
|
|
goto fail;
|
|
}
|
|
|
|
error = exec_map_first_page(imgp);
|
|
/*
|
|
* Also make certain that the interpreter stays the same, so set
|
|
* its VV_TEXT flag, too.
|
|
*/
|
|
if (error == 0)
|
|
nd->ni_vp->v_vflag |= VV_TEXT;
|
|
|
|
VOP_GETVOBJECT(nd->ni_vp, &imgp->object);
|
|
vm_object_reference(imgp->object);
|
|
|
|
VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */
|
|
if (error)
|
|
goto fail;
|
|
|
|
hdr = (const Elf_Ehdr *)imgp->image_header;
|
|
if ((error = __elfN(check_header)(hdr)) != 0)
|
|
goto fail;
|
|
if (hdr->e_type == ET_DYN)
|
|
rbase = *addr;
|
|
else if (hdr->e_type == ET_EXEC)
|
|
rbase = 0;
|
|
else {
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
|
|
/* Only support headers that fit within first page for now */
|
|
if ((hdr->e_phoff > PAGE_SIZE) ||
|
|
(hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
|
|
phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
|
|
|
|
for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
|
|
if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */
|
|
prot = 0;
|
|
if (phdr[i].p_flags & PF_X)
|
|
prot |= VM_PROT_EXECUTE;
|
|
if (phdr[i].p_flags & PF_W)
|
|
prot |= VM_PROT_WRITE;
|
|
if (phdr[i].p_flags & PF_R)
|
|
prot |= VM_PROT_READ;
|
|
|
|
if ((error = __elfN(load_section)(p, vmspace,
|
|
nd->ni_vp, imgp->object, phdr[i].p_offset,
|
|
(caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
|
|
phdr[i].p_memsz, phdr[i].p_filesz, prot,
|
|
pagesize)) != 0)
|
|
goto fail;
|
|
/*
|
|
* Establish the base address if this is the
|
|
* first segment.
|
|
*/
|
|
if (numsegs == 0)
|
|
base_addr = trunc_page(phdr[i].p_vaddr +
|
|
rbase);
|
|
numsegs++;
|
|
}
|
|
}
|
|
*addr = base_addr;
|
|
*entry = (unsigned long)hdr->e_entry + rbase;
|
|
|
|
fail:
|
|
if (imgp->firstpage)
|
|
exec_unmap_first_page(imgp);
|
|
if (imgp->image_header)
|
|
kmem_free_wakeup(exec_map, (vm_offset_t)imgp->image_header,
|
|
PAGE_SIZE);
|
|
if (imgp->object)
|
|
vm_object_deallocate(imgp->object);
|
|
|
|
if (nd->ni_vp)
|
|
vrele(nd->ni_vp);
|
|
|
|
free(tempdata, M_TEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
__CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
|
|
{
|
|
const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
|
|
const Elf_Phdr *phdr;
|
|
Elf_Auxargs *elf_auxargs = NULL;
|
|
struct vmspace *vmspace;
|
|
vm_prot_t prot;
|
|
u_long text_size = 0, data_size = 0, total_size = 0;
|
|
u_long text_addr = 0, data_addr = 0;
|
|
u_long seg_size, seg_addr;
|
|
u_long addr, entry = 0, proghdr = 0;
|
|
int error, i;
|
|
const char *interp = NULL;
|
|
Elf_Brandinfo *brand_info;
|
|
char *path;
|
|
struct thread *td = curthread;
|
|
struct sysentvec *sv;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
/*
|
|
* Do we have a valid ELF header ?
|
|
*/
|
|
if (__elfN(check_header)(hdr) != 0 || hdr->e_type != ET_EXEC)
|
|
return (-1);
|
|
|
|
/*
|
|
* From here on down, we return an errno, not -1, as we've
|
|
* detected an ELF file.
|
|
*/
|
|
|
|
if ((hdr->e_phoff > PAGE_SIZE) ||
|
|
(hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
|
|
/* Only support headers in first page for now */
|
|
return (ENOEXEC);
|
|
}
|
|
phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
|
|
|
|
/*
|
|
* From this point on, we may have resources that need to be freed.
|
|
*/
|
|
|
|
VOP_UNLOCK(imgp->vp, 0, td);
|
|
|
|
for (i = 0; i < hdr->e_phnum; i++) {
|
|
switch (phdr[i].p_type) {
|
|
case PT_INTERP: /* Path to interpreter */
|
|
if (phdr[i].p_filesz > MAXPATHLEN ||
|
|
phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
interp = imgp->image_header + phdr[i].p_offset;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
brand_info = __elfN(get_brandinfo)(hdr, interp);
|
|
if (brand_info == NULL) {
|
|
uprintf("ELF binary type \"%u\" not known.\n",
|
|
hdr->e_ident[EI_OSABI]);
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
sv = brand_info->sysvec;
|
|
|
|
if ((error = exec_extract_strings(imgp)) != 0)
|
|
goto fail;
|
|
|
|
exec_new_vmspace(imgp, sv);
|
|
|
|
vmspace = imgp->proc->p_vmspace;
|
|
|
|
for (i = 0; i < hdr->e_phnum; i++) {
|
|
switch (phdr[i].p_type) {
|
|
case PT_LOAD: /* Loadable segment */
|
|
prot = 0;
|
|
if (phdr[i].p_flags & PF_X)
|
|
prot |= VM_PROT_EXECUTE;
|
|
if (phdr[i].p_flags & PF_W)
|
|
prot |= VM_PROT_WRITE;
|
|
if (phdr[i].p_flags & PF_R)
|
|
prot |= VM_PROT_READ;
|
|
|
|
#if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER)
|
|
/*
|
|
* Some x86 binaries assume read == executable,
|
|
* notably the M3 runtime and therefore cvsup
|
|
*/
|
|
if (prot & VM_PROT_READ)
|
|
prot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
|
|
if ((error = __elfN(load_section)(imgp->proc, vmspace,
|
|
imgp->vp, imgp->object, phdr[i].p_offset,
|
|
(caddr_t)(uintptr_t)phdr[i].p_vaddr,
|
|
phdr[i].p_memsz, phdr[i].p_filesz, prot,
|
|
sv->sv_pagesize)) != 0)
|
|
goto fail;
|
|
|
|
seg_addr = trunc_page(phdr[i].p_vaddr);
|
|
seg_size = round_page(phdr[i].p_memsz +
|
|
phdr[i].p_vaddr - seg_addr);
|
|
|
|
/*
|
|
* Is this .text or .data? We can't use
|
|
* VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
|
|
* alpha terribly and possibly does other bad
|
|
* things so we stick to the old way of figuring
|
|
* it out: If the segment contains the program
|
|
* entry point, it's a text segment, otherwise it
|
|
* is a data segment.
|
|
*
|
|
* Note that obreak() assumes that data_addr +
|
|
* data_size == end of data load area, and the ELF
|
|
* file format expects segments to be sorted by
|
|
* address. If multiple data segments exist, the
|
|
* last one will be used.
|
|
*/
|
|
if (hdr->e_entry >= phdr[i].p_vaddr &&
|
|
hdr->e_entry < (phdr[i].p_vaddr +
|
|
phdr[i].p_memsz)) {
|
|
text_size = seg_size;
|
|
text_addr = seg_addr;
|
|
entry = (u_long)hdr->e_entry;
|
|
} else {
|
|
data_size = seg_size;
|
|
data_addr = seg_addr;
|
|
}
|
|
total_size += seg_size;
|
|
break;
|
|
case PT_PHDR: /* Program header table info */
|
|
proghdr = phdr[i].p_vaddr;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (data_addr == 0 && data_size == 0) {
|
|
data_addr = text_addr;
|
|
data_size = text_size;
|
|
}
|
|
|
|
/*
|
|
* Check limits. It should be safe to check the
|
|
* limits after loading the segments since we do
|
|
* not actually fault in all the segments pages.
|
|
*/
|
|
if (data_size >
|
|
imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
|
|
text_size > maxtsiz ||
|
|
total_size >
|
|
imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
|
|
error = ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
vmspace->vm_tsize = text_size >> PAGE_SHIFT;
|
|
vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
|
|
vmspace->vm_dsize = data_size >> PAGE_SHIFT;
|
|
vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
|
|
|
|
addr = ELF_RTLD_ADDR(vmspace);
|
|
|
|
imgp->entry_addr = entry;
|
|
|
|
imgp->proc->p_sysent = sv;
|
|
if (interp != NULL) {
|
|
path = malloc(MAXPATHLEN, M_TEMP, 0);
|
|
snprintf(path, MAXPATHLEN, "%s%s", brand_info->emul_path,
|
|
interp);
|
|
if ((error = __elfN(load_file)(imgp->proc, path, &addr,
|
|
&imgp->entry_addr, sv->sv_pagesize)) != 0) {
|
|
if ((error = __elfN(load_file)(imgp->proc, interp,
|
|
&addr, &imgp->entry_addr, sv->sv_pagesize)) != 0) {
|
|
uprintf("ELF interpreter %s not found\n",
|
|
path);
|
|
free(path, M_TEMP);
|
|
goto fail;
|
|
}
|
|
}
|
|
free(path, M_TEMP);
|
|
}
|
|
|
|
/*
|
|
* Construct auxargs table (used by the fixup routine)
|
|
*/
|
|
elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, 0);
|
|
elf_auxargs->execfd = -1;
|
|
elf_auxargs->phdr = proghdr;
|
|
elf_auxargs->phent = hdr->e_phentsize;
|
|
elf_auxargs->phnum = hdr->e_phnum;
|
|
elf_auxargs->pagesz = PAGE_SIZE;
|
|
elf_auxargs->base = addr;
|
|
elf_auxargs->flags = 0;
|
|
elf_auxargs->entry = entry;
|
|
elf_auxargs->trace = elf_trace;
|
|
|
|
imgp->auxargs = elf_auxargs;
|
|
imgp->interpreted = 0;
|
|
|
|
fail:
|
|
vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
return (error);
|
|
}
|
|
|
|
#define suword __CONCAT(suword, __ELF_WORD_SIZE)
|
|
|
|
int
|
|
__elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
|
|
{
|
|
Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
|
|
Elf_Addr *base;
|
|
Elf_Addr *pos;
|
|
|
|
base = (Elf_Addr *)*stack_base;
|
|
pos = base + (imgp->argc + imgp->envc + 2);
|
|
|
|
if (args->trace) {
|
|
AUXARGS_ENTRY(pos, AT_DEBUG, 1);
|
|
}
|
|
if (args->execfd != -1) {
|
|
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
|
|
}
|
|
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
|
|
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
|
|
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
|
|
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
|
|
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
|
|
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
|
|
AUXARGS_ENTRY(pos, AT_BASE, args->base);
|
|
AUXARGS_ENTRY(pos, AT_NULL, 0);
|
|
|
|
free(imgp->auxargs, M_TEMP);
|
|
imgp->auxargs = NULL;
|
|
|
|
base--;
|
|
suword(base, (long)imgp->argc);
|
|
*stack_base = (register_t *)base;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Code for generating ELF core dumps.
|
|
*/
|
|
|
|
typedef void (*segment_callback)(vm_map_entry_t, void *);
|
|
|
|
/* Closure for cb_put_phdr(). */
|
|
struct phdr_closure {
|
|
Elf_Phdr *phdr; /* Program header to fill in */
|
|
Elf_Off offset; /* Offset of segment in core file */
|
|
};
|
|
|
|
/* Closure for cb_size_segment(). */
|
|
struct sseg_closure {
|
|
int count; /* Count of writable segments. */
|
|
size_t size; /* Total size of all writable segments. */
|
|
};
|
|
|
|
static void cb_put_phdr(vm_map_entry_t, void *);
|
|
static void cb_size_segment(vm_map_entry_t, void *);
|
|
static void each_writable_segment(struct proc *, segment_callback, void *);
|
|
static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
|
|
int, void *, size_t);
|
|
static void __elfN(puthdr)(struct proc *, void *, size_t *,
|
|
const prstatus_t *, const prfpregset_t *, const prpsinfo_t *, int);
|
|
static void __elfN(putnote)(void *, size_t *, const char *, int,
|
|
const void *, size_t);
|
|
|
|
extern int osreldate;
|
|
|
|
int
|
|
__elfN(coredump)(td, vp, limit)
|
|
struct thread *td;
|
|
register struct vnode *vp;
|
|
off_t limit;
|
|
{
|
|
register struct proc *p = td->td_proc;
|
|
register struct ucred *cred = td->td_ucred;
|
|
int error = 0;
|
|
struct sseg_closure seginfo;
|
|
void *hdr;
|
|
size_t hdrsize;
|
|
|
|
/* Size the program segments. */
|
|
seginfo.count = 0;
|
|
seginfo.size = 0;
|
|
each_writable_segment(p, cb_size_segment, &seginfo);
|
|
|
|
/*
|
|
* Calculate the size of the core file header area by making
|
|
* a dry run of generating it. Nothing is written, but the
|
|
* size is calculated.
|
|
*/
|
|
hdrsize = 0;
|
|
__elfN(puthdr)((struct proc *)NULL, (void *)NULL, &hdrsize,
|
|
(const prstatus_t *)NULL, (const prfpregset_t *)NULL,
|
|
(const prpsinfo_t *)NULL, seginfo.count);
|
|
|
|
if (hdrsize + seginfo.size >= limit)
|
|
return (EFAULT);
|
|
|
|
/*
|
|
* Allocate memory for building the header, fill it up,
|
|
* and write it out.
|
|
*/
|
|
hdr = malloc(hdrsize, M_TEMP, 0);
|
|
if (hdr == NULL) {
|
|
return (EINVAL);
|
|
}
|
|
error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize);
|
|
|
|
/* Write the contents of all of the writable segments. */
|
|
if (error == 0) {
|
|
Elf_Phdr *php;
|
|
off_t offset;
|
|
int i;
|
|
|
|
php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
|
|
offset = hdrsize;
|
|
for (i = 0; i < seginfo.count; i++) {
|
|
error = vn_rdwr_inchunks(UIO_WRITE, vp,
|
|
(caddr_t)(uintptr_t)php->p_vaddr,
|
|
php->p_filesz, offset, UIO_USERSPACE,
|
|
IO_UNIT | IO_DIRECT, cred, NOCRED, (int *)NULL,
|
|
curthread); /* XXXKSE */
|
|
if (error != 0)
|
|
break;
|
|
offset += php->p_filesz;
|
|
php++;
|
|
}
|
|
}
|
|
free(hdr, M_TEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* A callback for each_writable_segment() to write out the segment's
|
|
* program header entry.
|
|
*/
|
|
static void
|
|
cb_put_phdr(entry, closure)
|
|
vm_map_entry_t entry;
|
|
void *closure;
|
|
{
|
|
struct phdr_closure *phc = (struct phdr_closure *)closure;
|
|
Elf_Phdr *phdr = phc->phdr;
|
|
|
|
phc->offset = round_page(phc->offset);
|
|
|
|
phdr->p_type = PT_LOAD;
|
|
phdr->p_offset = phc->offset;
|
|
phdr->p_vaddr = entry->start;
|
|
phdr->p_paddr = 0;
|
|
phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
|
|
phdr->p_align = PAGE_SIZE;
|
|
phdr->p_flags = 0;
|
|
if (entry->protection & VM_PROT_READ)
|
|
phdr->p_flags |= PF_R;
|
|
if (entry->protection & VM_PROT_WRITE)
|
|
phdr->p_flags |= PF_W;
|
|
if (entry->protection & VM_PROT_EXECUTE)
|
|
phdr->p_flags |= PF_X;
|
|
|
|
phc->offset += phdr->p_filesz;
|
|
phc->phdr++;
|
|
}
|
|
|
|
/*
|
|
* A callback for each_writable_segment() to gather information about
|
|
* the number of segments and their total size.
|
|
*/
|
|
static void
|
|
cb_size_segment(entry, closure)
|
|
vm_map_entry_t entry;
|
|
void *closure;
|
|
{
|
|
struct sseg_closure *ssc = (struct sseg_closure *)closure;
|
|
|
|
ssc->count++;
|
|
ssc->size += entry->end - entry->start;
|
|
}
|
|
|
|
/*
|
|
* For each writable segment in the process's memory map, call the given
|
|
* function with a pointer to the map entry and some arbitrary
|
|
* caller-supplied data.
|
|
*/
|
|
static void
|
|
each_writable_segment(p, func, closure)
|
|
struct proc *p;
|
|
segment_callback func;
|
|
void *closure;
|
|
{
|
|
vm_map_t map = &p->p_vmspace->vm_map;
|
|
vm_map_entry_t entry;
|
|
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
vm_object_t obj;
|
|
|
|
/*
|
|
* Don't dump inaccessible mappings, deal with legacy
|
|
* coredump mode.
|
|
*
|
|
* Note that read-only segments related to the elf binary
|
|
* are marked MAP_ENTRY_NOCOREDUMP now so we no longer
|
|
* need to arbitrarily ignore such segments.
|
|
*/
|
|
if (elf_legacy_coredump) {
|
|
if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
|
|
continue;
|
|
} else {
|
|
if ((entry->protection & VM_PROT_ALL) == 0)
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Dont include memory segment in the coredump if
|
|
* MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
|
|
* madvise(2). Do not dump submaps (i.e. parts of the
|
|
* kernel map).
|
|
*/
|
|
if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
|
|
continue;
|
|
|
|
if ((obj = entry->object.vm_object) == NULL)
|
|
continue;
|
|
|
|
/* Find the deepest backing object. */
|
|
while (obj->backing_object != NULL)
|
|
obj = obj->backing_object;
|
|
|
|
/* Ignore memory-mapped devices and such things. */
|
|
if (obj->type != OBJT_DEFAULT &&
|
|
obj->type != OBJT_SWAP &&
|
|
obj->type != OBJT_VNODE)
|
|
continue;
|
|
|
|
(*func)(entry, closure);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Write the core file header to the file, including padding up to
|
|
* the page boundary.
|
|
*/
|
|
static int
|
|
__elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize)
|
|
struct thread *td;
|
|
struct vnode *vp;
|
|
struct ucred *cred;
|
|
int numsegs;
|
|
size_t hdrsize;
|
|
void *hdr;
|
|
{
|
|
struct {
|
|
prstatus_t status;
|
|
prfpregset_t fpregset;
|
|
prpsinfo_t psinfo;
|
|
} *tempdata;
|
|
struct proc *p = td->td_proc;
|
|
size_t off;
|
|
prstatus_t *status;
|
|
prfpregset_t *fpregset;
|
|
prpsinfo_t *psinfo;
|
|
|
|
tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | 0);
|
|
status = &tempdata->status;
|
|
fpregset = &tempdata->fpregset;
|
|
psinfo = &tempdata->psinfo;
|
|
|
|
/* Gather the information for the header. */
|
|
status->pr_version = PRSTATUS_VERSION;
|
|
status->pr_statussz = sizeof(prstatus_t);
|
|
status->pr_gregsetsz = sizeof(gregset_t);
|
|
status->pr_fpregsetsz = sizeof(fpregset_t);
|
|
status->pr_osreldate = osreldate;
|
|
status->pr_cursig = p->p_sig;
|
|
status->pr_pid = p->p_pid;
|
|
fill_regs(td, &status->pr_reg);
|
|
|
|
fill_fpregs(td, fpregset);
|
|
|
|
psinfo->pr_version = PRPSINFO_VERSION;
|
|
psinfo->pr_psinfosz = sizeof(prpsinfo_t);
|
|
strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
|
|
|
|
/* XXX - We don't fill in the command line arguments properly yet. */
|
|
strlcpy(psinfo->pr_psargs, p->p_comm, sizeof(psinfo->pr_psargs));
|
|
|
|
/* Fill in the header. */
|
|
bzero(hdr, hdrsize);
|
|
off = 0;
|
|
__elfN(puthdr)(p, hdr, &off, status, fpregset, psinfo, numsegs);
|
|
|
|
free(tempdata, M_TEMP);
|
|
|
|
/* Write it to the core file. */
|
|
return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
|
|
UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
|
|
td)); /* XXXKSE */
|
|
}
|
|
|
|
static void
|
|
__elfN(puthdr)(struct proc *p, void *dst, size_t *off, const prstatus_t *status,
|
|
const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs)
|
|
{
|
|
size_t ehoff;
|
|
size_t phoff;
|
|
size_t noteoff;
|
|
size_t notesz;
|
|
|
|
ehoff = *off;
|
|
*off += sizeof(Elf_Ehdr);
|
|
|
|
phoff = *off;
|
|
*off += (numsegs + 1) * sizeof(Elf_Phdr);
|
|
|
|
noteoff = *off;
|
|
__elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
|
|
sizeof *status);
|
|
__elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
|
|
sizeof *fpregset);
|
|
__elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
|
|
sizeof *psinfo);
|
|
notesz = *off - noteoff;
|
|
|
|
/* Align up to a page boundary for the program segments. */
|
|
*off = round_page(*off);
|
|
|
|
if (dst != NULL) {
|
|
Elf_Ehdr *ehdr;
|
|
Elf_Phdr *phdr;
|
|
struct phdr_closure phc;
|
|
|
|
/*
|
|
* Fill in the ELF header.
|
|
*/
|
|
ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
|
|
ehdr->e_ident[EI_MAG0] = ELFMAG0;
|
|
ehdr->e_ident[EI_MAG1] = ELFMAG1;
|
|
ehdr->e_ident[EI_MAG2] = ELFMAG2;
|
|
ehdr->e_ident[EI_MAG3] = ELFMAG3;
|
|
ehdr->e_ident[EI_CLASS] = ELF_CLASS;
|
|
ehdr->e_ident[EI_DATA] = ELF_DATA;
|
|
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
|
|
ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
|
|
ehdr->e_ident[EI_ABIVERSION] = 0;
|
|
ehdr->e_ident[EI_PAD] = 0;
|
|
ehdr->e_type = ET_CORE;
|
|
ehdr->e_machine = ELF_ARCH;
|
|
ehdr->e_version = EV_CURRENT;
|
|
ehdr->e_entry = 0;
|
|
ehdr->e_phoff = phoff;
|
|
ehdr->e_flags = 0;
|
|
ehdr->e_ehsize = sizeof(Elf_Ehdr);
|
|
ehdr->e_phentsize = sizeof(Elf_Phdr);
|
|
ehdr->e_phnum = numsegs + 1;
|
|
ehdr->e_shentsize = sizeof(Elf_Shdr);
|
|
ehdr->e_shnum = 0;
|
|
ehdr->e_shstrndx = SHN_UNDEF;
|
|
|
|
/*
|
|
* Fill in the program header entries.
|
|
*/
|
|
phdr = (Elf_Phdr *)((char *)dst + phoff);
|
|
|
|
/* The note segement. */
|
|
phdr->p_type = PT_NOTE;
|
|
phdr->p_offset = noteoff;
|
|
phdr->p_vaddr = 0;
|
|
phdr->p_paddr = 0;
|
|
phdr->p_filesz = notesz;
|
|
phdr->p_memsz = 0;
|
|
phdr->p_flags = 0;
|
|
phdr->p_align = 0;
|
|
phdr++;
|
|
|
|
/* All the writable segments from the program. */
|
|
phc.phdr = phdr;
|
|
phc.offset = *off;
|
|
each_writable_segment(p, cb_put_phdr, &phc);
|
|
}
|
|
}
|
|
|
|
static void
|
|
__elfN(putnote)(void *dst, size_t *off, const char *name, int type,
|
|
const void *desc, size_t descsz)
|
|
{
|
|
Elf_Note note;
|
|
|
|
note.n_namesz = strlen(name) + 1;
|
|
note.n_descsz = descsz;
|
|
note.n_type = type;
|
|
if (dst != NULL)
|
|
bcopy(¬e, (char *)dst + *off, sizeof note);
|
|
*off += sizeof note;
|
|
if (dst != NULL)
|
|
bcopy(name, (char *)dst + *off, note.n_namesz);
|
|
*off += roundup2(note.n_namesz, sizeof(Elf_Size));
|
|
if (dst != NULL)
|
|
bcopy(desc, (char *)dst + *off, note.n_descsz);
|
|
*off += roundup2(note.n_descsz, sizeof(Elf_Size));
|
|
}
|
|
|
|
/*
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
*/
|
|
static struct execsw __elfN(execsw) = {
|
|
__CONCAT(exec_, __elfN(imgact)),
|
|
__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
|
|
};
|
|
EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
|