#include <mach/vm_param.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/namei.h>
#include <sys/vnode_internal.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/acct.h>
#include <sys/file_internal.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/disk.h>
#include <sys/conf.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <kern/kalloc.h>
#include <vm/vm_kern.h>
#include <pexpert/pexpert.h>
extern unsigned char rootdevice[];
extern struct mach_header _mh_execute_header;
static int kernel_symfile_opened = 0;
static int error_code = 0;
extern int IODTGetLoaderInfo(char *key, void **infoAddr, int *infoSize);
extern void IODTFreeLoaderInfo(char *key, void *infoAddr, int infoSize);
static int
output_kernel_symbols(struct proc *p)
{
struct vnode *vp;
kauth_cred_t cred = p->p_ucred;
struct vnode_attr va;
struct vfs_context context;
struct load_command *cmd;
struct mach_header *orig_mh, *mh;
struct segment_command *orig_ds, *orig_ts, *orig_le, *sg;
struct section *se, *const_text;
struct symtab_command *st, *orig_st;
struct nlist *sym;
vm_size_t orig_mhsize, orig_st_size;
vm_offset_t header;
vm_size_t header_size = 0;
int error, error1;
unsigned int i, j;
caddr_t addr;
vm_offset_t offset;
int rc_mh, rc_sc;
error = EFAULT;
vp = NULL;
header = NULL;
orig_mh = NULL;
orig_st = NULL;
rc_mh = IODTGetLoaderInfo("Kernel-__HEADER",
(void **)&orig_mh, &orig_mhsize);
if (rc_mh == 0 && orig_mh)
IODTFreeLoaderInfo("Kernel-__HEADER",
(void *)orig_mh, round_page_32(orig_mhsize));
rc_sc = IODTGetLoaderInfo("Kernel-__SYMTAB",
(void **) &orig_st, &orig_st_size);
if (rc_sc == 0 && orig_st)
IODTFreeLoaderInfo("Kernel-__SYMTAB",
(void *)orig_st, round_page_32(orig_st_size));
if (cred->cr_svuid != cred->cr_ruid || cred->cr_svgid != cred->cr_rgid)
goto out;
if (rootdevice[0] == 'e' && rootdevice[1] == 'n')
goto out;
context.vc_proc = p;
context.vc_ucred = cred;
if ((error = vnode_open("mach.sym", (O_CREAT | FWRITE), (S_IRUSR | S_IRGRP | S_IROTH), 0, &vp, &context)))
goto out;
error = EFAULT;
VATTR_INIT(&va);
VATTR_WANTED(&va, va_nlink);
if ((vp->v_type != VREG) || vnode_getattr(vp, &va, &context) || (va.va_nlink != 1))
goto out;
VATTR_INIT(&va);
VATTR_SET(&va, va_data_size, 0);
vnode_setattr(vp, &va, &context);
p->p_acflag |= ACORE;
orig_ds = orig_ts = orig_le = NULL;
orig_st = NULL;
orig_mh = &_mh_execute_header;
cmd = (struct load_command *) &orig_mh[1];
for (i = 0; i < orig_mh->ncmds; i++) {
if (cmd->cmd == LC_SEGMENT) {
struct segment_command *orig_sg = (struct segment_command *) cmd;
if (!strcmp(SEG_TEXT, orig_sg->segname))
orig_ts = orig_sg;
else if (!strcmp(SEG_DATA, orig_sg->segname))
orig_ds = orig_sg;
else if (!strcmp(SEG_LINKEDIT, orig_sg->segname))
orig_le = orig_sg;
}
else if (cmd->cmd == LC_SYMTAB)
orig_st = (struct symtab_command *) cmd;
cmd = (struct load_command *) ((caddr_t) cmd + cmd->cmdsize);
}
if (!orig_ts || !orig_ds || !orig_le || !orig_st)
goto out;
const_text = NULL;
se = (struct section *) &orig_ts[1];
for (i = 0; i < orig_ts->nsects; i++, se++) {
if (!strcmp("__const", se->sectname)) {
const_text = se;
break;
}
}
if (!const_text)
goto out;
header_size = sizeof(struct mach_header)
+ orig_ts->cmdsize
+ orig_ds->cmdsize
+ sizeof(struct symtab_command);
(void) kmem_alloc(kernel_map,
(vm_offset_t *) &header,
(vm_size_t) header_size);
if (header)
bzero((void *) header, header_size);
else
goto out;
mh = (struct mach_header *) header;
mh->magic = orig_mh->magic;
mh->cputype = orig_mh->cputype;
mh->cpusubtype = orig_mh->cpusubtype;
mh->filetype = orig_mh->filetype;
mh->ncmds = 3;
mh->sizeofcmds = header_size - sizeof(struct mach_header);
mh->flags = orig_mh->flags;
offset = round_page(header_size);
addr = (caddr_t) const_text->addr;
sg = (struct segment_command *) &mh[1];
bcopy(orig_ts, sg, orig_ts->cmdsize);
sg->vmaddr = (unsigned long) addr;
sg->vmsize = const_text->size;
sg->fileoff = 0;
sg->filesize = const_text->size + round_page(header_size);
sg->maxprot = 0;
sg->initprot = 0;
sg->flags = 0;
se = (struct section *)(sg+1);
for ( j = 0; j < sg->nsects; j++, se++ ) {
se->addr = (unsigned long) addr;
se->size = 0;
se->offset = offset;
se->nreloc = 0;
if (!strcmp("__const", se->sectname)) {
se->size = const_text->size;
addr += const_text->size;
offset += const_text->size;
const_text = se;
}
}
offset = round_page(offset);
sg = (struct segment_command *)((int)sg + sg->cmdsize);
bcopy(orig_ds, sg, orig_ds->cmdsize);
sg->vmaddr = (unsigned long) addr;
sg->vmsize = 0x1000; sg->fileoff = offset;
sg->filesize = 0;
sg->maxprot = 0;
sg->initprot = 0;
sg->flags = 0;
se = (struct section *)(sg+1);
for ( j = 0; j < sg->nsects; j++, se++ ) {
se->addr = (unsigned long) addr;
se->size = 0;
se->offset = offset;
se->nreloc = 0;
}
offset = round_page(offset);
st = (struct symtab_command *)((int)sg + sg->cmdsize);
st->cmd = LC_SYMTAB;
st->cmdsize = sizeof(struct symtab_command);
st->symoff = offset;
st->nsyms = orig_st->nsyms;
st->strsize = orig_st->strsize;
st->stroff = offset + st->nsyms * sizeof(struct nlist);
sym = (struct nlist *) orig_le->vmaddr;
for (i = 0; i < st->nsyms; i++, sym++ ) {
if ( (sym->n_type & N_TYPE) == N_SECT) {
sym->n_sect = NO_SECT;
sym->n_type = (sym->n_type & ~N_TYPE) | N_ABS;
}
}
error = vn_rdwr(UIO_WRITE, vp, (caddr_t) mh, header_size, (off_t) 0,
UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
if (error)
goto out;
error = vn_rdwr(UIO_WRITE, vp, (caddr_t) const_text->addr,
const_text->size, const_text->offset,
UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
if (error)
goto out;
offset = st->nsyms * sizeof(struct nlist) + st->strsize; error = vn_rdwr(UIO_WRITE, vp,
(caddr_t) orig_le->vmaddr, offset, st->symoff,
UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
out:
if (header)
kmem_free(kernel_map, header, header_size);
if (vp) {
error1 = vnode_close(vp, FWRITE, &context);
if (!error) error = error1;
}
return(error);
}
int get_kernel_symfile(struct proc *p, char **symfile)
{
if (!kernel_symfile_opened) {
kernel_symfile_opened = 1;
error_code = output_kernel_symbols(p);
}
if (!error_code)
*symfile = "\\mach.sym";
return error_code;
}