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HardenedBSD/sys/kern/subr_module.c
Warner Losh 4d846d260e spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD 
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:		pfg
MFC After:		3 days
Sponsored by:		Netflix
2023-05-12 10:44:03 -06:00

576 lines
13 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1998 Michael Smith
* All rights reserved.
* Copyright (c) 2020 NetApp Inc.
* Copyright (c) 2020 Klara Inc.
*
* 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.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/linker.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <machine/metadata.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
/*
* Preloaded module support
*/
vm_offset_t preload_addr_relocate = 0;
caddr_t preload_metadata;
/*
* Search for the preloaded module (name)
*/
caddr_t
preload_search_by_name(const char *name)
{
caddr_t curp;
uint32_t *hdr;
int next;
if (preload_metadata != NULL) {
curp = preload_metadata;
for (;;) {
hdr = (uint32_t *)curp;
if (hdr[0] == 0 && hdr[1] == 0)
break;
/* Search for a MODINFO_NAME field */
if ((hdr[0] == MODINFO_NAME) &&
!strcmp(name, curp + sizeof(uint32_t) * 2))
return(curp);
/* skip to next field */
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
}
}
return(NULL);
}
/*
* Search for the first preloaded module of (type)
*/
caddr_t
preload_search_by_type(const char *type)
{
caddr_t curp, lname;
uint32_t *hdr;
int next;
if (preload_metadata != NULL) {
curp = preload_metadata;
lname = NULL;
for (;;) {
hdr = (uint32_t *)curp;
if (hdr[0] == 0 && hdr[1] == 0)
break;
/* remember the start of each record */
if (hdr[0] == MODINFO_NAME)
lname = curp;
/* Search for a MODINFO_TYPE field */
if ((hdr[0] == MODINFO_TYPE) &&
!strcmp(type, curp + sizeof(uint32_t) * 2))
return(lname);
/* skip to next field */
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
}
}
return(NULL);
}
/*
* Walk through the preloaded module list
*/
caddr_t
preload_search_next_name(caddr_t base)
{
caddr_t curp;
uint32_t *hdr;
int next;
if (preload_metadata != NULL) {
/* Pick up where we left off last time */
if (base) {
/* skip to next field */
curp = base;
hdr = (uint32_t *)curp;
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
} else
curp = preload_metadata;
for (;;) {
hdr = (uint32_t *)curp;
if (hdr[0] == 0 && hdr[1] == 0)
break;
/* Found a new record? */
if (hdr[0] == MODINFO_NAME)
return curp;
/* skip to next field */
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
}
}
return(NULL);
}
/*
* Given a preloaded module handle (mod), return a pointer
* to the data for the attribute (inf).
*/
caddr_t
preload_search_info(caddr_t mod, int inf)
{
caddr_t curp;
uint32_t *hdr;
uint32_t type = 0;
int next;
if (mod == NULL)
return (NULL);
curp = mod;
for (;;) {
hdr = (uint32_t *)curp;
/* end of module data? */
if (hdr[0] == 0 && hdr[1] == 0)
break;
/*
* We give up once we've looped back to what we were looking at
* first - this should normally be a MODINFO_NAME field.
*/
if (type == 0) {
type = hdr[0];
} else {
if (hdr[0] == type)
break;
}
/*
* Attribute match? Return pointer to data.
* Consumer may safely assume that size value precedes
* data.
*/
if (hdr[0] == inf)
return(curp + (sizeof(uint32_t) * 2));
/* skip to next field */
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
}
return(NULL);
}
/*
* Delete a preload record by name.
*/
void
preload_delete_name(const char *name)
{
caddr_t addr, curp;
uint32_t *hdr, sz;
int next;
int clearing;
addr = 0;
sz = 0;
if (preload_metadata != NULL) {
clearing = 0;
curp = preload_metadata;
for (;;) {
hdr = (uint32_t *)curp;
if (hdr[0] == MODINFO_NAME || (hdr[0] == 0 && hdr[1] == 0)) {
/* Free memory used to store the file. */
if (addr != 0 && sz != 0)
kmem_bootstrap_free((vm_offset_t)addr, sz);
addr = 0;
sz = 0;
if (hdr[0] == 0)
break;
if (!strcmp(name, curp + sizeof(uint32_t) * 2))
clearing = 1; /* got it, start clearing */
else if (clearing) {
clearing = 0; /* at next one now.. better stop */
}
}
if (clearing) {
if (hdr[0] == MODINFO_ADDR)
addr = *(caddr_t *)(curp + sizeof(uint32_t) * 2);
else if (hdr[0] == MODINFO_SIZE)
sz = *(uint32_t *)(curp + sizeof(uint32_t) * 2);
hdr[0] = MODINFO_EMPTY;
}
/* skip to next field */
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
}
}
}
void *
preload_fetch_addr(caddr_t mod)
{
caddr_t *mdp;
mdp = (caddr_t *)preload_search_info(mod, MODINFO_ADDR);
if (mdp == NULL)
return (NULL);
return (*mdp + preload_addr_relocate);
}
size_t
preload_fetch_size(caddr_t mod)
{
size_t *mdp;
mdp = (size_t *)preload_search_info(mod, MODINFO_SIZE);
if (mdp == NULL)
return (0);
return (*mdp);
}
/* Called from locore. Convert physical pointers to kvm. Sigh. */
void
preload_bootstrap_relocate(vm_offset_t offset)
{
caddr_t curp;
uint32_t *hdr;
vm_offset_t *ptr;
int next;
if (preload_metadata != NULL) {
curp = preload_metadata;
for (;;) {
hdr = (uint32_t *)curp;
if (hdr[0] == 0 && hdr[1] == 0)
break;
/* Deal with the ones that we know we have to fix */
switch (hdr[0]) {
case MODINFO_ADDR:
case MODINFO_METADATA|MODINFOMD_FONT:
case MODINFO_METADATA|MODINFOMD_SSYM:
case MODINFO_METADATA|MODINFOMD_ESYM:
ptr = (vm_offset_t *)(curp + (sizeof(uint32_t) * 2));
*ptr += offset;
break;
}
/* The rest is beyond us for now */
/* skip to next field */
next = sizeof(uint32_t) * 2 + hdr[1];
next = roundup(next, sizeof(u_long));
curp += next;
}
}
}
/*
* Parse the modinfo type and append to the provided sbuf.
*/
static void
preload_modinfo_type(struct sbuf *sbp, int type)
{
if ((type & MODINFO_METADATA) == 0) {
switch (type) {
case MODINFO_END:
sbuf_cat(sbp, "MODINFO_END");
break;
case MODINFO_NAME:
sbuf_cat(sbp, "MODINFO_NAME");
break;
case MODINFO_TYPE:
sbuf_cat(sbp, "MODINFO_TYPE");
break;
case MODINFO_ADDR:
sbuf_cat(sbp, "MODINFO_ADDR");
break;
case MODINFO_SIZE:
sbuf_cat(sbp, "MODINFO_SIZE");
break;
case MODINFO_EMPTY:
sbuf_cat(sbp, "MODINFO_EMPTY");
break;
case MODINFO_ARGS:
sbuf_cat(sbp, "MODINFO_ARGS");
break;
default:
sbuf_cat(sbp, "unrecognized modinfo attribute");
}
return;
}
sbuf_cat(sbp, "MODINFO_METADATA | ");
switch (type & ~MODINFO_METADATA) {
case MODINFOMD_ELFHDR:
sbuf_cat(sbp, "MODINFOMD_ELFHDR");
break;
case MODINFOMD_SSYM:
sbuf_cat(sbp, "MODINFOMD_SSYM");
break;
case MODINFOMD_ESYM:
sbuf_cat(sbp, "MODINFOMD_ESYM");
break;
case MODINFOMD_DYNAMIC:
sbuf_cat(sbp, "MODINFOMD_DYNAMIC");
break;
case MODINFOMD_ENVP:
sbuf_cat(sbp, "MODINFOMD_ENVP");
break;
case MODINFOMD_HOWTO:
sbuf_cat(sbp, "MODINFOMD_HOWTO");
break;
case MODINFOMD_KERNEND:
sbuf_cat(sbp, "MODINFOMD_KERNEND");
break;
case MODINFOMD_SHDR:
sbuf_cat(sbp, "MODINFOMD_SHDR");
break;
case MODINFOMD_CTORS_ADDR:
sbuf_cat(sbp, "MODINFOMD_CTORS_ADDR");
break;
case MODINFOMD_CTORS_SIZE:
sbuf_cat(sbp, "MODINFOMD_CTORS_SIZE");
break;
case MODINFOMD_FW_HANDLE:
sbuf_cat(sbp, "MODINFOMD_FW_HANDLE");
break;
case MODINFOMD_KEYBUF:
sbuf_cat(sbp, "MODINFOMD_KEYBUF");
break;
#ifdef MODINFOMD_SMAP
case MODINFOMD_SMAP:
sbuf_cat(sbp, "MODINFOMD_SMAP");
break;
#endif
#ifdef MODINFOMD_SMAP_XATTR
case MODINFOMD_SMAP_XATTR:
sbuf_cat(sbp, "MODINFOMD_SMAP_XATTR");
break;
#endif
#ifdef MODINFOMD_DTBP
case MODINFOMD_DTBP:
sbuf_cat(sbp, "MODINFOMD_DTBP");
break;
#endif
#ifdef MODINFOMD_EFI_MAP
case MODINFOMD_EFI_MAP:
sbuf_cat(sbp, "MODINFOMD_EFI_MAP");
break;
#endif
#ifdef MODINFOMD_EFI_FB
case MODINFOMD_EFI_FB:
sbuf_cat(sbp, "MODINFOMD_EFI_FB");
break;
#endif
#ifdef MODINFOMD_MODULEP
case MODINFOMD_MODULEP:
sbuf_cat(sbp, "MODINFOMD_MODULEP");
break;
#endif
#ifdef MODINFOMD_VBE_FB
case MODINFOMD_VBE_FB:
sbuf_cat(sbp, "MODINFOMD_VBE_FB");
break;
#endif
#ifdef MODINFOMD_FONT
case MODINFOMD_FONT:
sbuf_cat(sbp, "MODINFOMD_FONT");
break;
#endif
default:
sbuf_cat(sbp, "unrecognized metadata type");
}
}
/*
* Print the modinfo value, depending on type.
*/
static void
preload_modinfo_value(struct sbuf *sbp, uint32_t *bptr, int type, int len)
{
#ifdef __LP64__
#define sbuf_print_vmoffset(sb, o) sbuf_printf(sb, "0x%016lx", o);
#else
#define sbuf_print_vmoffset(sb, o) sbuf_printf(sb, "0x%08x", o);
#endif
switch (type) {
case MODINFO_NAME:
case MODINFO_TYPE:
case MODINFO_ARGS:
sbuf_printf(sbp, "%s", (char *)bptr);
break;
case MODINFO_SIZE:
case MODINFO_METADATA | MODINFOMD_CTORS_SIZE:
sbuf_printf(sbp, "%lu", *(u_long *)bptr);
break;
case MODINFO_ADDR:
case MODINFO_METADATA | MODINFOMD_SSYM:
case MODINFO_METADATA | MODINFOMD_ESYM:
case MODINFO_METADATA | MODINFOMD_DYNAMIC:
case MODINFO_METADATA | MODINFOMD_KERNEND:
case MODINFO_METADATA | MODINFOMD_ENVP:
case MODINFO_METADATA | MODINFOMD_CTORS_ADDR:
#ifdef MODINFOMD_SMAP
case MODINFO_METADATA | MODINFOMD_SMAP:
#endif
#ifdef MODINFOMD_SMAP_XATTR
case MODINFO_METADATA | MODINFOMD_SMAP_XATTR:
#endif
#ifdef MODINFOMD_DTBP
case MODINFO_METADATA | MODINFOMD_DTBP:
#endif
#ifdef MODINFOMD_EFI_FB
case MODINFO_METADATA | MODINFOMD_EFI_FB:
#endif
#ifdef MODINFOMD_VBE_FB
case MODINFO_METADATA | MODINFOMD_VBE_FB:
#endif
#ifdef MODINFOMD_FONT
case MODINFO_METADATA | MODINFOMD_FONT:
#endif
sbuf_print_vmoffset(sbp, *(vm_offset_t *)bptr);
break;
case MODINFO_METADATA | MODINFOMD_HOWTO:
sbuf_printf(sbp, "0x%08x", *bptr);
break;
case MODINFO_METADATA | MODINFOMD_SHDR:
case MODINFO_METADATA | MODINFOMD_ELFHDR:
case MODINFO_METADATA | MODINFOMD_FW_HANDLE:
case MODINFO_METADATA | MODINFOMD_KEYBUF:
#ifdef MODINFOMD_EFI_MAP
case MODINFO_METADATA | MODINFOMD_EFI_MAP:
#endif
/* Don't print data buffers. */
sbuf_cat(sbp, "buffer contents omitted");
break;
default:
break;
}
#undef sbuf_print_vmoffset
}
static void
preload_dump_internal(struct sbuf *sbp)
{
uint32_t *bptr, type, len;
KASSERT(preload_metadata != NULL,
("%s called without setting up preload_metadata", __func__));
/*
* Iterate through the TLV-encoded sections.
*/
bptr = (uint32_t *)preload_metadata;
sbuf_putc(sbp, '\n');
while (bptr[0] != MODINFO_END || bptr[1] != MODINFO_END) {
sbuf_printf(sbp, " %p:\n", bptr);
type = *bptr++;
len = *bptr++;
sbuf_printf(sbp, "\ttype:\t(%#04x) ", type);
preload_modinfo_type(sbp, type);
sbuf_putc(sbp, '\n');
sbuf_printf(sbp, "\tlen:\t%u\n", len);
sbuf_cat(sbp, "\tvalue:\t");
preload_modinfo_value(sbp, bptr, type, len);
sbuf_putc(sbp, '\n');
bptr += roundup(len, sizeof(u_long)) / sizeof(uint32_t);
}
}
/*
* Print the preloaded data to the console. Called from the machine-dependent
* initialization routines, e.g. hammer_time().
*/
void
preload_dump(void)
{
char buf[512];
struct sbuf sb;
/*
* This function is expected to be called before malloc is available,
* so use a static buffer and struct sbuf.
*/
sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
sbuf_set_drain(&sb, sbuf_printf_drain, NULL);
preload_dump_internal(&sb);
sbuf_finish(&sb);
sbuf_delete(&sb);
}
static int
sysctl_preload_dump(SYSCTL_HANDLER_ARGS)
{
struct sbuf sb;
int error;
if (preload_metadata == NULL)
return (EINVAL);
sbuf_new_for_sysctl(&sb, NULL, 512, req);
preload_dump_internal(&sb);
error = sbuf_finish(&sb);
sbuf_delete(&sb);
return (error);
}
SYSCTL_PROC(_debug, OID_AUTO, dump_modinfo,
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
NULL, 0, sysctl_preload_dump, "A",
"pretty-print the bootloader metadata");
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