126b36a21e
i386 binaries on the amd64 and ia64 with the sysctl, instead of unconditionally enabling it. Reviewed by: marcel
1698 lines
45 KiB
C
1698 lines
45 KiB
C
/*-
|
|
* Copyright (c) 2000 David O'Brien
|
|
* Copyright (c) 1995-1996 Søren Schmidt
|
|
* Copyright (c) 1996 Peter Wemm
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in this position and unchanged.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_capsicum.h"
|
|
#include "opt_compat.h"
|
|
#include "opt_core.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/capability.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/imgact_elf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/pioctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/procfs.h>
|
|
#include <sys/racct.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/sf_buf.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/eventhandler.h>
|
|
|
|
#include <net/zlib.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include <machine/elf.h>
|
|
#include <machine/md_var.h>
|
|
|
|
#define OLD_EI_BRAND 8
|
|
|
|
static int __elfN(check_header)(const Elf_Ehdr *hdr);
|
|
static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
|
|
const char *interp, int32_t *osrel);
|
|
static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
|
|
u_long *entry, size_t pagesize);
|
|
static int __elfN(load_section)(struct vmspace *vmspace, vm_object_t object,
|
|
vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
|
|
vm_prot_t prot, size_t pagesize);
|
|
static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
|
|
static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
|
|
int32_t *osrel);
|
|
static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
|
|
static boolean_t __elfN(check_note)(struct image_params *imgp,
|
|
Elf_Brandnote *checknote, int32_t *osrel);
|
|
static vm_prot_t __elfN(trans_prot)(Elf_Word);
|
|
static Elf_Word __elfN(untrans_prot)(vm_prot_t);
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
|
|
"");
|
|
|
|
#ifdef COMPRESS_USER_CORES
|
|
static int compress_core(gzFile, char *, char *, unsigned int,
|
|
struct thread * td);
|
|
#define CORE_BUF_SIZE (16 * 1024)
|
|
#endif
|
|
|
|
int __elfN(fallback_brand) = -1;
|
|
SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
|
|
fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
|
|
__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
|
|
TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
|
|
&__elfN(fallback_brand));
|
|
|
|
static int elf_legacy_coredump = 0;
|
|
SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
|
|
&elf_legacy_coredump, 0, "");
|
|
|
|
static int __elfN(nxstack) = 0;
|
|
SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
|
|
nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
|
|
__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
|
|
|
|
#if __ELF_WORD_SIZE == 32
|
|
#if defined(__amd64__) || defined(__ia64__)
|
|
int i386_read_exec = 0;
|
|
SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
|
|
"enable execution from readable segments");
|
|
#endif
|
|
#endif
|
|
|
|
static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
|
|
|
|
#define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
|
|
#define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
|
|
#define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
|
|
|
|
static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
|
|
|
|
Elf_Brandnote __elfN(freebsd_brandnote) = {
|
|
.hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
|
|
.hdr.n_descsz = sizeof(int32_t),
|
|
.hdr.n_type = 1,
|
|
.vendor = FREEBSD_ABI_VENDOR,
|
|
.flags = BN_TRANSLATE_OSREL,
|
|
.trans_osrel = __elfN(freebsd_trans_osrel)
|
|
};
|
|
|
|
static boolean_t
|
|
__elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
|
|
{
|
|
uintptr_t p;
|
|
|
|
p = (uintptr_t)(note + 1);
|
|
p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
|
|
*osrel = *(const int32_t *)(p);
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
static const char GNU_ABI_VENDOR[] = "GNU";
|
|
static int GNU_KFREEBSD_ABI_DESC = 3;
|
|
|
|
Elf_Brandnote __elfN(kfreebsd_brandnote) = {
|
|
.hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
|
|
.hdr.n_descsz = 16, /* XXX at least 16 */
|
|
.hdr.n_type = 1,
|
|
.vendor = GNU_ABI_VENDOR,
|
|
.flags = BN_TRANSLATE_OSREL,
|
|
.trans_osrel = kfreebsd_trans_osrel
|
|
};
|
|
|
|
static boolean_t
|
|
kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
|
|
{
|
|
const Elf32_Word *desc;
|
|
uintptr_t p;
|
|
|
|
p = (uintptr_t)(note + 1);
|
|
p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
|
|
|
|
desc = (const Elf32_Word *)p;
|
|
if (desc[0] != GNU_KFREEBSD_ABI_DESC)
|
|
return (FALSE);
|
|
|
|
/*
|
|
* Debian GNU/kFreeBSD embed the earliest compatible kernel version
|
|
* (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
|
|
*/
|
|
*osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
int
|
|
__elfN(insert_brand_entry)(Elf_Brandinfo *entry)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
if (elf_brand_list[i] == NULL) {
|
|
elf_brand_list[i] = entry;
|
|
break;
|
|
}
|
|
}
|
|
if (i == MAX_BRANDS) {
|
|
printf("WARNING: %s: could not insert brandinfo entry: %p\n",
|
|
__func__, entry);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
__elfN(remove_brand_entry)(Elf_Brandinfo *entry)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
if (elf_brand_list[i] == entry) {
|
|
elf_brand_list[i] = NULL;
|
|
break;
|
|
}
|
|
}
|
|
if (i == MAX_BRANDS)
|
|
return (-1);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
__elfN(brand_inuse)(Elf_Brandinfo *entry)
|
|
{
|
|
struct proc *p;
|
|
int rval = FALSE;
|
|
|
|
sx_slock(&allproc_lock);
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
if (p->p_sysent == entry->sysvec) {
|
|
rval = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
|
|
return (rval);
|
|
}
|
|
|
|
static Elf_Brandinfo *
|
|
__elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
|
|
int32_t *osrel)
|
|
{
|
|
const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
|
|
Elf_Brandinfo *bi;
|
|
boolean_t ret;
|
|
int i;
|
|
|
|
/*
|
|
* We support four types of branding -- (1) the ELF EI_OSABI field
|
|
* that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
|
|
* branding w/in the ELF header, (3) path of the `interp_path'
|
|
* field, and (4) the ".note.ABI-tag" ELF section.
|
|
*/
|
|
|
|
/* Look for an ".note.ABI-tag" ELF section */
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
bi = elf_brand_list[i];
|
|
if (bi == NULL)
|
|
continue;
|
|
if (hdr->e_machine == bi->machine && (bi->flags &
|
|
(BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
|
|
ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
|
|
if (ret)
|
|
return (bi);
|
|
}
|
|
}
|
|
|
|
/* If the executable has a brand, search for it in the brand list. */
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
bi = elf_brand_list[i];
|
|
if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
|
|
continue;
|
|
if (hdr->e_machine == bi->machine &&
|
|
(hdr->e_ident[EI_OSABI] == bi->brand ||
|
|
strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
|
|
bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
|
|
return (bi);
|
|
}
|
|
|
|
/* Lacking a known brand, search for a recognized interpreter. */
|
|
if (interp != NULL) {
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
bi = elf_brand_list[i];
|
|
if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
|
|
continue;
|
|
if (hdr->e_machine == bi->machine &&
|
|
strcmp(interp, bi->interp_path) == 0)
|
|
return (bi);
|
|
}
|
|
}
|
|
|
|
/* Lacking a recognized interpreter, try the default brand */
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
bi = elf_brand_list[i];
|
|
if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
|
|
continue;
|
|
if (hdr->e_machine == bi->machine &&
|
|
__elfN(fallback_brand) == bi->brand)
|
|
return (bi);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
__elfN(check_header)(const Elf_Ehdr *hdr)
|
|
{
|
|
Elf_Brandinfo *bi;
|
|
int i;
|
|
|
|
if (!IS_ELF(*hdr) ||
|
|
hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
|
|
hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
|
|
hdr->e_ident[EI_VERSION] != EV_CURRENT ||
|
|
hdr->e_phentsize != sizeof(Elf_Phdr) ||
|
|
hdr->e_version != ELF_TARG_VER)
|
|
return (ENOEXEC);
|
|
|
|
/*
|
|
* Make sure we have at least one brand for this machine.
|
|
*/
|
|
|
|
for (i = 0; i < MAX_BRANDS; i++) {
|
|
bi = elf_brand_list[i];
|
|
if (bi != NULL && bi->machine == hdr->e_machine)
|
|
break;
|
|
}
|
|
if (i == MAX_BRANDS)
|
|
return (ENOEXEC);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
__elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
|
|
vm_offset_t start, vm_offset_t end, vm_prot_t prot)
|
|
{
|
|
struct sf_buf *sf;
|
|
int error;
|
|
vm_offset_t off;
|
|
|
|
/*
|
|
* Create the page if it doesn't exist yet. Ignore errors.
|
|
*/
|
|
vm_map_lock(map);
|
|
vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
|
|
VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
vm_map_unlock(map);
|
|
|
|
/*
|
|
* Find the page from the underlying object.
|
|
*/
|
|
if (object) {
|
|
sf = vm_imgact_map_page(object, offset);
|
|
if (sf == NULL)
|
|
return (KERN_FAILURE);
|
|
off = offset - trunc_page(offset);
|
|
error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
|
|
end - start);
|
|
vm_imgact_unmap_page(sf);
|
|
if (error) {
|
|
return (KERN_FAILURE);
|
|
}
|
|
}
|
|
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
static int
|
|
__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
|
|
vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
|
|
{
|
|
struct sf_buf *sf;
|
|
vm_offset_t off;
|
|
vm_size_t sz;
|
|
int error, rv;
|
|
|
|
if (start != trunc_page(start)) {
|
|
rv = __elfN(map_partial)(map, object, offset, start,
|
|
round_page(start), prot);
|
|
if (rv)
|
|
return (rv);
|
|
offset += round_page(start) - start;
|
|
start = round_page(start);
|
|
}
|
|
if (end != round_page(end)) {
|
|
rv = __elfN(map_partial)(map, object, offset +
|
|
trunc_page(end) - start, trunc_page(end), end, prot);
|
|
if (rv)
|
|
return (rv);
|
|
end = trunc_page(end);
|
|
}
|
|
if (end > start) {
|
|
if (offset & PAGE_MASK) {
|
|
/*
|
|
* The mapping is not page aligned. This means we have
|
|
* to copy the data. Sigh.
|
|
*/
|
|
rv = vm_map_find(map, NULL, 0, &start, end - start,
|
|
FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0);
|
|
if (rv)
|
|
return (rv);
|
|
if (object == NULL)
|
|
return (KERN_SUCCESS);
|
|
for (; start < end; start += sz) {
|
|
sf = vm_imgact_map_page(object, offset);
|
|
if (sf == NULL)
|
|
return (KERN_FAILURE);
|
|
off = offset - trunc_page(offset);
|
|
sz = end - start;
|
|
if (sz > PAGE_SIZE - off)
|
|
sz = PAGE_SIZE - off;
|
|
error = copyout((caddr_t)sf_buf_kva(sf) + off,
|
|
(caddr_t)start, sz);
|
|
vm_imgact_unmap_page(sf);
|
|
if (error) {
|
|
return (KERN_FAILURE);
|
|
}
|
|
offset += sz;
|
|
}
|
|
rv = KERN_SUCCESS;
|
|
} else {
|
|
vm_object_reference(object);
|
|
vm_map_lock(map);
|
|
rv = vm_map_insert(map, object, offset, start, end,
|
|
prot, VM_PROT_ALL, cow);
|
|
vm_map_unlock(map);
|
|
if (rv != KERN_SUCCESS)
|
|
vm_object_deallocate(object);
|
|
}
|
|
return (rv);
|
|
} else {
|
|
return (KERN_SUCCESS);
|
|
}
|
|
}
|
|
|
|
static int
|
|
__elfN(load_section)(struct vmspace *vmspace,
|
|
vm_object_t object, vm_offset_t offset,
|
|
caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
|
|
size_t pagesize)
|
|
{
|
|
struct sf_buf *sf;
|
|
size_t map_len;
|
|
vm_offset_t map_addr;
|
|
int error, rv, cow;
|
|
size_t copy_len;
|
|
vm_offset_t file_addr;
|
|
|
|
/*
|
|
* It's necessary to fail if the filsz + offset taken from the
|
|
* header is greater than the actual file pager object's size.
|
|
* If we were to allow this, then the vm_map_find() below would
|
|
* walk right off the end of the file object and into the ether.
|
|
*
|
|
* While I'm here, might as well check for something else that
|
|
* is invalid: filsz cannot be greater than memsz.
|
|
*/
|
|
if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
|
|
filsz > memsz) {
|
|
uprintf("elf_load_section: truncated ELF file\n");
|
|
return (ENOEXEC);
|
|
}
|
|
|
|
map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
|
|
file_addr = trunc_page_ps(offset, pagesize);
|
|
|
|
/*
|
|
* We have two choices. We can either clear the data in the last page
|
|
* of an oversized mapping, or we can start the anon mapping a page
|
|
* early and copy the initialized data into that first page. We
|
|
* choose the second..
|
|
*/
|
|
if (memsz > filsz)
|
|
map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
|
|
else
|
|
map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
|
|
|
|
if (map_len != 0) {
|
|
/* cow flags: don't dump readonly sections in core */
|
|
cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
|
|
(prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
|
|
|
|
rv = __elfN(map_insert)(&vmspace->vm_map,
|
|
object,
|
|
file_addr, /* file offset */
|
|
map_addr, /* virtual start */
|
|
map_addr + map_len,/* virtual end */
|
|
prot,
|
|
cow);
|
|
if (rv != KERN_SUCCESS)
|
|
return (EINVAL);
|
|
|
|
/* we can stop now if we've covered it all */
|
|
if (memsz == filsz) {
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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
|
|
* 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.
|
|
*/
|
|
copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
|
|
map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
|
|
map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
|
|
map_addr;
|
|
|
|
/* This had damn well better be true! */
|
|
if (map_len != 0) {
|
|
rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr,
|
|
map_addr + map_len, VM_PROT_ALL, 0);
|
|
if (rv != KERN_SUCCESS) {
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
if (copy_len != 0) {
|
|
vm_offset_t off;
|
|
|
|
sf = vm_imgact_map_page(object, offset + filsz);
|
|
if (sf == NULL)
|
|
return (EIO);
|
|
|
|
/* send the page fragment to user space */
|
|
off = trunc_page_ps(offset + filsz, pagesize) -
|
|
trunc_page(offset + filsz);
|
|
error = copyout((caddr_t)sf_buf_kva(sf) + off,
|
|
(caddr_t)map_addr, copy_len);
|
|
vm_imgact_unmap_page(sf);
|
|
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 (0);
|
|
}
|
|
|
|
/*
|
|
* 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 vfslocked, error, i, numsegs;
|
|
|
|
#ifdef CAPABILITY_MODE
|
|
/*
|
|
* XXXJA: This check can go away once we are sufficiently confident
|
|
* that the checks in namei() are correct.
|
|
*/
|
|
if (IN_CAPABILITY_MODE(curthread))
|
|
return (ECAPMODE);
|
|
#endif
|
|
|
|
tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
|
|
nd = &tempdata->nd;
|
|
attr = &tempdata->attr;
|
|
imgp = &tempdata->image_params;
|
|
|
|
/*
|
|
* Initialize part of the common data
|
|
*/
|
|
imgp->proc = p;
|
|
imgp->attr = attr;
|
|
imgp->firstpage = NULL;
|
|
imgp->image_header = NULL;
|
|
imgp->object = NULL;
|
|
imgp->execlabel = NULL;
|
|
|
|
NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file,
|
|
curthread);
|
|
vfslocked = 0;
|
|
if ((error = namei(nd)) != 0) {
|
|
nd->ni_vp = NULL;
|
|
goto fail;
|
|
}
|
|
vfslocked = NDHASGIANT(nd);
|
|
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)
|
|
goto fail;
|
|
|
|
error = exec_map_first_page(imgp);
|
|
if (error)
|
|
goto fail;
|
|
|
|
/*
|
|
* Also make certain that the interpreter stays the same, so set
|
|
* its VV_TEXT flag, too.
|
|
*/
|
|
nd->ni_vp->v_vflag |= VV_TEXT;
|
|
|
|
imgp->object = nd->ni_vp->v_object;
|
|
|
|
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 */
|
|
/* (multiplication of two Elf_Half fields will not overflow) */
|
|
if ((hdr->e_phoff > PAGE_SIZE) ||
|
|
(hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
|
|
phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
|
|
if (!aligned(phdr, Elf_Addr)) {
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
|
|
if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
|
|
/* Loadable segment */
|
|
prot = __elfN(trans_prot)(phdr[i].p_flags);
|
|
if ((error = __elfN(load_section)(vmspace,
|
|
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 (nd->ni_vp)
|
|
vput(nd->ni_vp);
|
|
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
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;
|
|
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, baddr, et_dyn_addr, entry = 0, proghdr = 0;
|
|
int32_t osrel = 0;
|
|
int error = 0, i, n;
|
|
const char *interp = NULL, *newinterp = NULL;
|
|
Elf_Brandinfo *brand_info;
|
|
char *path;
|
|
struct sysentvec *sv;
|
|
|
|
/*
|
|
* Do we have a valid ELF header ?
|
|
*
|
|
* Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
|
|
* if particular brand doesn't support it.
|
|
*/
|
|
if (__elfN(check_header)(hdr) != 0 ||
|
|
(hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
|
|
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);
|
|
if (!aligned(phdr, Elf_Addr))
|
|
return (ENOEXEC);
|
|
n = 0;
|
|
baddr = 0;
|
|
for (i = 0; i < hdr->e_phnum; i++) {
|
|
switch (phdr[i].p_type) {
|
|
case PT_LOAD:
|
|
if (n == 0)
|
|
baddr = phdr[i].p_vaddr;
|
|
n++;
|
|
break;
|
|
case PT_INTERP:
|
|
/* Path to interpreter */
|
|
if (phdr[i].p_filesz > MAXPATHLEN ||
|
|
phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE)
|
|
return (ENOEXEC);
|
|
interp = imgp->image_header + phdr[i].p_offset;
|
|
break;
|
|
case PT_GNU_STACK:
|
|
if (__elfN(nxstack))
|
|
imgp->stack_prot =
|
|
__elfN(trans_prot)(phdr[i].p_flags);
|
|
break;
|
|
}
|
|
}
|
|
|
|
brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
|
|
if (brand_info == NULL) {
|
|
uprintf("ELF binary type \"%u\" not known.\n",
|
|
hdr->e_ident[EI_OSABI]);
|
|
return (ENOEXEC);
|
|
}
|
|
if (hdr->e_type == ET_DYN) {
|
|
if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
|
|
return (ENOEXEC);
|
|
/*
|
|
* Honour the base load address from the dso if it is
|
|
* non-zero for some reason.
|
|
*/
|
|
if (baddr == 0)
|
|
et_dyn_addr = ET_DYN_LOAD_ADDR;
|
|
else
|
|
et_dyn_addr = 0;
|
|
} else
|
|
et_dyn_addr = 0;
|
|
sv = brand_info->sysvec;
|
|
if (interp != NULL && brand_info->interp_newpath != NULL)
|
|
newinterp = brand_info->interp_newpath;
|
|
|
|
/*
|
|
* Avoid a possible deadlock if the current address space is destroyed
|
|
* and that address space maps the locked vnode. In the common case,
|
|
* the locked vnode's v_usecount is decremented but remains greater
|
|
* than zero. Consequently, the vnode lock is not needed by vrele().
|
|
* However, in cases where the vnode lock is external, such as nullfs,
|
|
* v_usecount may become zero.
|
|
*/
|
|
VOP_UNLOCK(imgp->vp, 0);
|
|
|
|
error = exec_new_vmspace(imgp, sv);
|
|
imgp->proc->p_sysent = sv;
|
|
|
|
vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (error)
|
|
return (error);
|
|
|
|
vmspace = imgp->proc->p_vmspace;
|
|
|
|
for (i = 0; i < hdr->e_phnum; i++) {
|
|
switch (phdr[i].p_type) {
|
|
case PT_LOAD: /* Loadable segment */
|
|
if (phdr[i].p_memsz == 0)
|
|
break;
|
|
prot = __elfN(trans_prot)(phdr[i].p_flags);
|
|
|
|
#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)(vmspace,
|
|
imgp->object, phdr[i].p_offset,
|
|
(caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
|
|
phdr[i].p_memsz, phdr[i].p_filesz, prot,
|
|
sv->sv_pagesize)) != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* If this segment contains the program headers,
|
|
* remember their virtual address for the AT_PHDR
|
|
* aux entry. Static binaries don't usually include
|
|
* a PT_PHDR entry.
|
|
*/
|
|
if (phdr[i].p_offset == 0 &&
|
|
hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
|
|
<= phdr[i].p_filesz)
|
|
proghdr = phdr[i].p_vaddr + hdr->e_phoff +
|
|
et_dyn_addr;
|
|
|
|
seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
|
|
seg_size = round_page(phdr[i].p_memsz +
|
|
phdr[i].p_vaddr + et_dyn_addr - seg_addr);
|
|
|
|
/*
|
|
* Make the largest executable segment the official
|
|
* text segment and all others data.
|
|
*
|
|
* 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 (phdr[i].p_flags & PF_X && text_size < seg_size) {
|
|
text_size = seg_size;
|
|
text_addr = seg_addr;
|
|
} 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 + et_dyn_addr;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (data_addr == 0 && data_size == 0) {
|
|
data_addr = text_addr;
|
|
data_size = text_size;
|
|
}
|
|
|
|
entry = (u_long)hdr->e_entry + et_dyn_addr;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
PROC_LOCK(imgp->proc);
|
|
if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
|
|
text_size > maxtsiz ||
|
|
total_size > lim_cur(imgp->proc, RLIMIT_VMEM) ||
|
|
racct_set(imgp->proc, RACCT_DATA, data_size) != 0 ||
|
|
racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) {
|
|
PROC_UNLOCK(imgp->proc);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
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;
|
|
|
|
/*
|
|
* We load the dynamic linker where a userland call
|
|
* to mmap(0, ...) would put it. The rationale behind this
|
|
* calculation is that it leaves room for the heap to grow to
|
|
* its maximum allowed size.
|
|
*/
|
|
addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr +
|
|
lim_max(imgp->proc, RLIMIT_DATA));
|
|
PROC_UNLOCK(imgp->proc);
|
|
|
|
imgp->entry_addr = entry;
|
|
|
|
if (interp != NULL) {
|
|
int have_interp = FALSE;
|
|
VOP_UNLOCK(imgp->vp, 0);
|
|
if (brand_info->emul_path != NULL &&
|
|
brand_info->emul_path[0] != '\0') {
|
|
path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
|
|
snprintf(path, MAXPATHLEN, "%s%s",
|
|
brand_info->emul_path, interp);
|
|
error = __elfN(load_file)(imgp->proc, path, &addr,
|
|
&imgp->entry_addr, sv->sv_pagesize);
|
|
free(path, M_TEMP);
|
|
if (error == 0)
|
|
have_interp = TRUE;
|
|
}
|
|
if (!have_interp && newinterp != NULL) {
|
|
error = __elfN(load_file)(imgp->proc, newinterp, &addr,
|
|
&imgp->entry_addr, sv->sv_pagesize);
|
|
if (error == 0)
|
|
have_interp = TRUE;
|
|
}
|
|
if (!have_interp) {
|
|
error = __elfN(load_file)(imgp->proc, interp, &addr,
|
|
&imgp->entry_addr, sv->sv_pagesize);
|
|
}
|
|
vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (error != 0) {
|
|
uprintf("ELF interpreter %s not found\n", interp);
|
|
return (error);
|
|
}
|
|
} else
|
|
addr = et_dyn_addr;
|
|
|
|
/*
|
|
* Construct auxargs table (used by the fixup routine)
|
|
*/
|
|
elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
|
|
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;
|
|
|
|
imgp->auxargs = elf_auxargs;
|
|
imgp->interpreted = 0;
|
|
imgp->reloc_base = addr;
|
|
imgp->proc->p_osrel = osrel;
|
|
|
|
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->args->argc + imgp->args->envc + 2);
|
|
|
|
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);
|
|
if (imgp->execpathp != 0)
|
|
AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
|
|
AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate);
|
|
if (imgp->canary != 0) {
|
|
AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
|
|
AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
|
|
}
|
|
AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
|
|
if (imgp->pagesizes != 0) {
|
|
AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
|
|
AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
|
|
}
|
|
AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
|
|
!= NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
|
|
imgp->sysent->sv_stackprot);
|
|
AUXARGS_ENTRY(pos, AT_NULL, 0);
|
|
|
|
free(imgp->auxargs, M_TEMP);
|
|
imgp->auxargs = NULL;
|
|
|
|
base--;
|
|
suword(base, (long)imgp->args->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 thread *, segment_callback, void *);
|
|
static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
|
|
int, void *, size_t, gzFile);
|
|
static void __elfN(puthdr)(struct thread *, void *, size_t *, int);
|
|
static void __elfN(putnote)(void *, size_t *, const char *, int,
|
|
const void *, size_t);
|
|
|
|
#ifdef COMPRESS_USER_CORES
|
|
extern int compress_user_cores;
|
|
extern int compress_user_cores_gzlevel;
|
|
#endif
|
|
|
|
static int
|
|
core_output(struct vnode *vp, void *base, size_t len, off_t offset,
|
|
struct ucred *active_cred, struct ucred *file_cred,
|
|
struct thread *td, char *core_buf, gzFile gzfile) {
|
|
|
|
int error;
|
|
if (gzfile) {
|
|
#ifdef COMPRESS_USER_CORES
|
|
error = compress_core(gzfile, base, core_buf, len, td);
|
|
#else
|
|
panic("shouldn't be here");
|
|
#endif
|
|
} else {
|
|
error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset,
|
|
UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred,
|
|
NULL, td);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
__elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
|
|
{
|
|
struct ucred *cred = td->td_ucred;
|
|
int error = 0;
|
|
struct sseg_closure seginfo;
|
|
void *hdr;
|
|
size_t hdrsize;
|
|
|
|
gzFile gzfile = Z_NULL;
|
|
char *core_buf = NULL;
|
|
#ifdef COMPRESS_USER_CORES
|
|
char gzopen_flags[8];
|
|
char *p;
|
|
int doing_compress = flags & IMGACT_CORE_COMPRESS;
|
|
#endif
|
|
|
|
hdr = NULL;
|
|
|
|
#ifdef COMPRESS_USER_CORES
|
|
if (doing_compress) {
|
|
p = gzopen_flags;
|
|
*p++ = 'w';
|
|
if (compress_user_cores_gzlevel >= 0 &&
|
|
compress_user_cores_gzlevel <= 9)
|
|
*p++ = '0' + compress_user_cores_gzlevel;
|
|
*p = 0;
|
|
gzfile = gz_open("", gzopen_flags, vp);
|
|
if (gzfile == Z_NULL) {
|
|
error = EFAULT;
|
|
goto done;
|
|
}
|
|
core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
|
|
if (!core_buf) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Size the program segments. */
|
|
seginfo.count = 0;
|
|
seginfo.size = 0;
|
|
each_writable_segment(td, 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)(td, (void *)NULL, &hdrsize, seginfo.count);
|
|
|
|
#ifdef RACCT
|
|
PROC_LOCK(td->td_proc);
|
|
error = racct_add(td->td_proc, RACCT_CORE, hdrsize + seginfo.size);
|
|
PROC_UNLOCK(td->td_proc);
|
|
if (error != 0) {
|
|
error = EFAULT;
|
|
goto done;
|
|
}
|
|
#endif
|
|
if (hdrsize + seginfo.size >= limit) {
|
|
error = EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Allocate memory for building the header, fill it up,
|
|
* and write it out.
|
|
*/
|
|
hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
|
|
if (hdr == NULL) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize,
|
|
gzfile);
|
|
|
|
/* 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 = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr,
|
|
php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile);
|
|
if (error != 0)
|
|
break;
|
|
offset += php->p_filesz;
|
|
php++;
|
|
}
|
|
}
|
|
if (error) {
|
|
log(LOG_WARNING,
|
|
"Failed to write core file for process %s (error %d)\n",
|
|
curproc->p_comm, error);
|
|
}
|
|
|
|
done:
|
|
#ifdef COMPRESS_USER_CORES
|
|
if (core_buf)
|
|
free(core_buf, M_TEMP);
|
|
if (gzfile)
|
|
gzclose(gzfile);
|
|
#endif
|
|
|
|
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 = __elfN(untrans_prot)(entry->protection);
|
|
|
|
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(td, func, closure)
|
|
struct thread *td;
|
|
segment_callback func;
|
|
void *closure;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
vm_map_t map = &p->p_vmspace->vm_map;
|
|
vm_map_entry_t entry;
|
|
vm_object_t backing_object, object;
|
|
boolean_t ignore_entry;
|
|
|
|
vm_map_lock_read(map);
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
/*
|
|
* 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 ((object = entry->object.vm_object) == NULL)
|
|
continue;
|
|
|
|
/* Ignore memory-mapped devices and such things. */
|
|
VM_OBJECT_LOCK(object);
|
|
while ((backing_object = object->backing_object) != NULL) {
|
|
VM_OBJECT_LOCK(backing_object);
|
|
VM_OBJECT_UNLOCK(object);
|
|
object = backing_object;
|
|
}
|
|
ignore_entry = object->type != OBJT_DEFAULT &&
|
|
object->type != OBJT_SWAP && object->type != OBJT_VNODE;
|
|
VM_OBJECT_UNLOCK(object);
|
|
if (ignore_entry)
|
|
continue;
|
|
|
|
(*func)(entry, closure);
|
|
}
|
|
vm_map_unlock_read(map);
|
|
}
|
|
|
|
/*
|
|
* 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, gzfile)
|
|
struct thread *td;
|
|
struct vnode *vp;
|
|
struct ucred *cred;
|
|
int numsegs;
|
|
size_t hdrsize;
|
|
void *hdr;
|
|
gzFile gzfile;
|
|
{
|
|
size_t off;
|
|
|
|
/* Fill in the header. */
|
|
bzero(hdr, hdrsize);
|
|
off = 0;
|
|
__elfN(puthdr)(td, hdr, &off, numsegs);
|
|
|
|
if (!gzfile) {
|
|
/* 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));
|
|
} else {
|
|
#ifdef COMPRESS_USER_CORES
|
|
if (gzwrite(gzfile, hdr, hdrsize) != hdrsize) {
|
|
log(LOG_WARNING,
|
|
"Failed to compress core file header for process"
|
|
" %s.\n", curproc->p_comm);
|
|
return (EFAULT);
|
|
}
|
|
else {
|
|
return (0);
|
|
}
|
|
#else
|
|
panic("shouldn't be here");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
|
|
#include <compat/freebsd32/freebsd32.h>
|
|
|
|
typedef struct prstatus32 elf_prstatus_t;
|
|
typedef struct prpsinfo32 elf_prpsinfo_t;
|
|
typedef struct fpreg32 elf_prfpregset_t;
|
|
typedef struct fpreg32 elf_fpregset_t;
|
|
typedef struct reg32 elf_gregset_t;
|
|
typedef struct thrmisc32 elf_thrmisc_t;
|
|
#else
|
|
typedef prstatus_t elf_prstatus_t;
|
|
typedef prpsinfo_t elf_prpsinfo_t;
|
|
typedef prfpregset_t elf_prfpregset_t;
|
|
typedef prfpregset_t elf_fpregset_t;
|
|
typedef gregset_t elf_gregset_t;
|
|
typedef thrmisc_t elf_thrmisc_t;
|
|
#endif
|
|
|
|
static void
|
|
__elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
|
|
{
|
|
struct {
|
|
elf_prstatus_t status;
|
|
elf_prfpregset_t fpregset;
|
|
elf_prpsinfo_t psinfo;
|
|
elf_thrmisc_t thrmisc;
|
|
} *tempdata;
|
|
elf_prstatus_t *status;
|
|
elf_prfpregset_t *fpregset;
|
|
elf_prpsinfo_t *psinfo;
|
|
elf_thrmisc_t *thrmisc;
|
|
struct proc *p;
|
|
struct thread *thr;
|
|
size_t ehoff, noteoff, notesz, phoff;
|
|
|
|
p = td->td_proc;
|
|
|
|
ehoff = *off;
|
|
*off += sizeof(Elf_Ehdr);
|
|
|
|
phoff = *off;
|
|
*off += (numsegs + 1) * sizeof(Elf_Phdr);
|
|
|
|
noteoff = *off;
|
|
/*
|
|
* Don't allocate space for the notes if we're just calculating
|
|
* the size of the header. We also don't collect the data.
|
|
*/
|
|
if (dst != NULL) {
|
|
tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK);
|
|
status = &tempdata->status;
|
|
fpregset = &tempdata->fpregset;
|
|
psinfo = &tempdata->psinfo;
|
|
thrmisc = &tempdata->thrmisc;
|
|
} else {
|
|
tempdata = NULL;
|
|
status = NULL;
|
|
fpregset = NULL;
|
|
psinfo = NULL;
|
|
thrmisc = NULL;
|
|
}
|
|
|
|
if (dst != NULL) {
|
|
psinfo->pr_version = PRPSINFO_VERSION;
|
|
psinfo->pr_psinfosz = sizeof(elf_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));
|
|
}
|
|
__elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
|
|
sizeof *psinfo);
|
|
|
|
/*
|
|
* To have the debugger select the right thread (LWP) as the initial
|
|
* thread, we dump the state of the thread passed to us in td first.
|
|
* This is the thread that causes the core dump and thus likely to
|
|
* be the right thread one wants to have selected in the debugger.
|
|
*/
|
|
thr = td;
|
|
while (thr != NULL) {
|
|
if (dst != NULL) {
|
|
status->pr_version = PRSTATUS_VERSION;
|
|
status->pr_statussz = sizeof(elf_prstatus_t);
|
|
status->pr_gregsetsz = sizeof(elf_gregset_t);
|
|
status->pr_fpregsetsz = sizeof(elf_fpregset_t);
|
|
status->pr_osreldate = osreldate;
|
|
status->pr_cursig = p->p_sig;
|
|
status->pr_pid = thr->td_tid;
|
|
#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
|
|
fill_regs32(thr, &status->pr_reg);
|
|
fill_fpregs32(thr, fpregset);
|
|
#else
|
|
fill_regs(thr, &status->pr_reg);
|
|
fill_fpregs(thr, fpregset);
|
|
#endif
|
|
memset(&thrmisc->_pad, 0, sizeof (thrmisc->_pad));
|
|
strcpy(thrmisc->pr_tname, thr->td_name);
|
|
}
|
|
__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_THRMISC, thrmisc,
|
|
sizeof *thrmisc);
|
|
/*
|
|
* Allow for MD specific notes, as well as any MD
|
|
* specific preparations for writing MI notes.
|
|
*/
|
|
__elfN(dump_thread)(thr, dst, off);
|
|
|
|
thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
|
|
TAILQ_NEXT(thr, td_plist);
|
|
if (thr == td)
|
|
thr = TAILQ_NEXT(thr, td_plist);
|
|
}
|
|
|
|
notesz = *off - noteoff;
|
|
|
|
if (dst != NULL)
|
|
free(tempdata, M_TEMP);
|
|
|
|
/* 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;
|
|
#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
|
|
ehdr->e_machine = ELF_ARCH32;
|
|
#else
|
|
ehdr->e_machine = ELF_ARCH;
|
|
#endif
|
|
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(td, 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));
|
|
}
|
|
|
|
/*
|
|
* Try to find the appropriate ABI-note section for checknote,
|
|
* fetch the osreldate for binary from the ELF OSABI-note. Only the
|
|
* first page of the image is searched, the same as for headers.
|
|
*/
|
|
static boolean_t
|
|
__elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
|
|
int32_t *osrel)
|
|
{
|
|
const Elf_Note *note, *note0, *note_end;
|
|
const Elf_Phdr *phdr, *pnote;
|
|
const Elf_Ehdr *hdr;
|
|
const char *note_name;
|
|
int i;
|
|
|
|
pnote = NULL;
|
|
hdr = (const Elf_Ehdr *)imgp->image_header;
|
|
phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
|
|
|
|
for (i = 0; i < hdr->e_phnum; i++) {
|
|
if (phdr[i].p_type == PT_NOTE) {
|
|
pnote = &phdr[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (pnote == NULL || pnote->p_offset >= PAGE_SIZE ||
|
|
pnote->p_offset + pnote->p_filesz >= PAGE_SIZE)
|
|
return (FALSE);
|
|
|
|
note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
|
|
note_end = (const Elf_Note *)(imgp->image_header +
|
|
pnote->p_offset + pnote->p_filesz);
|
|
for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
|
|
if (!aligned(note, Elf32_Addr))
|
|
return (FALSE);
|
|
if (note->n_namesz != checknote->hdr.n_namesz ||
|
|
note->n_descsz != checknote->hdr.n_descsz ||
|
|
note->n_type != checknote->hdr.n_type)
|
|
goto nextnote;
|
|
note_name = (const char *)(note + 1);
|
|
if (strncmp(checknote->vendor, note_name,
|
|
checknote->hdr.n_namesz) != 0)
|
|
goto nextnote;
|
|
|
|
/*
|
|
* Fetch the osreldate for binary
|
|
* from the ELF OSABI-note if necessary.
|
|
*/
|
|
if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
|
|
checknote->trans_osrel != NULL)
|
|
return (checknote->trans_osrel(note, osrel));
|
|
return (TRUE);
|
|
|
|
nextnote:
|
|
note = (const Elf_Note *)((const char *)(note + 1) +
|
|
roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
|
|
roundup2(note->n_descsz, sizeof(Elf32_Addr)));
|
|
}
|
|
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* 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));
|
|
|
|
#ifdef COMPRESS_USER_CORES
|
|
/*
|
|
* Compress and write out a core segment for a user process.
|
|
*
|
|
* 'inbuf' is the starting address of a VM segment in the process' address
|
|
* space that is to be compressed and written out to the core file. 'dest_buf'
|
|
* is a buffer in the kernel's address space. The segment is copied from
|
|
* 'inbuf' to 'dest_buf' first before being processed by the compression
|
|
* routine gzwrite(). This copying is necessary because the content of the VM
|
|
* segment may change between the compression pass and the crc-computation pass
|
|
* in gzwrite(). This is because realtime threads may preempt the UNIX kernel.
|
|
*/
|
|
static int
|
|
compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len,
|
|
struct thread *td)
|
|
{
|
|
int len_compressed;
|
|
int error = 0;
|
|
unsigned int chunk_len;
|
|
|
|
while (len) {
|
|
chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len;
|
|
copyin(inbuf, dest_buf, chunk_len);
|
|
len_compressed = gzwrite(file, dest_buf, chunk_len);
|
|
|
|
EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed);
|
|
|
|
if ((unsigned int)len_compressed != chunk_len) {
|
|
log(LOG_WARNING,
|
|
"compress_core: length mismatch (0x%x returned, "
|
|
"0x%x expected)\n", len_compressed, chunk_len);
|
|
EVENTHANDLER_INVOKE(app_coredump_error, td,
|
|
"compress_core: length mismatch %x -> %x",
|
|
chunk_len, len_compressed);
|
|
error = EFAULT;
|
|
break;
|
|
}
|
|
inbuf += chunk_len;
|
|
len -= chunk_len;
|
|
maybe_yield();
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#endif /* COMPRESS_USER_CORES */
|
|
|
|
static vm_prot_t
|
|
__elfN(trans_prot)(Elf_Word flags)
|
|
{
|
|
vm_prot_t prot;
|
|
|
|
prot = 0;
|
|
if (flags & PF_X)
|
|
prot |= VM_PROT_EXECUTE;
|
|
if (flags & PF_W)
|
|
prot |= VM_PROT_WRITE;
|
|
if (flags & PF_R)
|
|
prot |= VM_PROT_READ;
|
|
#if __ELF_WORD_SIZE == 32
|
|
#if defined(__amd64__) || defined(__ia64__)
|
|
if (i386_read_exec && (flags & PF_R))
|
|
prot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
#endif
|
|
return (prot);
|
|
}
|
|
|
|
static Elf_Word
|
|
__elfN(untrans_prot)(vm_prot_t prot)
|
|
{
|
|
Elf_Word flags;
|
|
|
|
flags = 0;
|
|
if (prot & VM_PROT_EXECUTE)
|
|
flags |= PF_X;
|
|
if (prot & VM_PROT_READ)
|
|
flags |= PF_R;
|
|
if (prot & VM_PROT_WRITE)
|
|
flags |= PF_W;
|
|
return (flags);
|
|
}
|