mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 02:50:43 +00:00
![H.J. Lu](/assets/img/avatar_default.png)
commit b21ebf2fb4
upstream.
On i386, there are 2 types of PLTs, PIC and non-PIC. PIE and shared
objects must use PIC PLT. To use PIC PLT, you need to load
_GLOBAL_OFFSET_TABLE_ into EBX first. There is no need for that on
x86-64 since x86-64 uses PC-relative PLT.
On x86-64, for 32-bit PC-relative branches, we can generate PLT32
relocation, instead of PC32 relocation, which can also be used as
a marker for 32-bit PC-relative branches. Linker can always reduce
PLT32 relocation to PC32 if function is defined locally. Local
functions should use PC32 relocation. As far as Linux kernel is
concerned, R_X86_64_PLT32 can be treated the same as R_X86_64_PC32
since Linux kernel doesn't use PLT.
R_X86_64_PLT32 for 32-bit PC-relative branches has been enabled in
binutils master branch which will become binutils 2.31.
[ hjl is working on having better documentation on this all, but a few
more notes from him:
"PLT32 relocation is used as marker for PC-relative branches. Because
of EBX, it looks odd to generate PLT32 relocation on i386 when EBX
doesn't have GOT.
As for symbol resolution, PLT32 and PC32 relocations are almost
interchangeable. But when linker sees PLT32 relocation against a
protected symbol, it can resolved locally at link-time since it is
used on a branch instruction. Linker can't do that for PC32
relocation"
but for the kernel use, the two are basically the same, and this
commit gets things building and working with the current binutils
master - Linus ]
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
280 lines
7.2 KiB
C
280 lines
7.2 KiB
C
/* Kernel module help for x86.
|
|
Copyright (C) 2001 Rusty Russell.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kasan.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/jump_label.h>
|
|
#include <linux/random.h>
|
|
|
|
#include <asm/text-patching.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/unwind.h>
|
|
|
|
#if 0
|
|
#define DEBUGP(fmt, ...) \
|
|
printk(KERN_DEBUG fmt, ##__VA_ARGS__)
|
|
#else
|
|
#define DEBUGP(fmt, ...) \
|
|
do { \
|
|
if (0) \
|
|
printk(KERN_DEBUG fmt, ##__VA_ARGS__); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_RANDOMIZE_BASE
|
|
static unsigned long module_load_offset;
|
|
|
|
/* Mutex protects the module_load_offset. */
|
|
static DEFINE_MUTEX(module_kaslr_mutex);
|
|
|
|
static unsigned long int get_module_load_offset(void)
|
|
{
|
|
if (kaslr_enabled()) {
|
|
mutex_lock(&module_kaslr_mutex);
|
|
/*
|
|
* Calculate the module_load_offset the first time this
|
|
* code is called. Once calculated it stays the same until
|
|
* reboot.
|
|
*/
|
|
if (module_load_offset == 0)
|
|
module_load_offset =
|
|
(get_random_int() % 1024 + 1) * PAGE_SIZE;
|
|
mutex_unlock(&module_kaslr_mutex);
|
|
}
|
|
return module_load_offset;
|
|
}
|
|
#else
|
|
static unsigned long int get_module_load_offset(void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
void *p;
|
|
|
|
if (PAGE_ALIGN(size) > MODULES_LEN)
|
|
return NULL;
|
|
|
|
p = __vmalloc_node_range(size, MODULE_ALIGN,
|
|
MODULES_VADDR + get_module_load_offset(),
|
|
MODULES_END, GFP_KERNEL,
|
|
PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
|
|
__builtin_return_address(0));
|
|
if (p && (kasan_module_alloc(p, size) < 0)) {
|
|
vfree(p);
|
|
return NULL;
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
int apply_relocate(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
|
|
Elf32_Sym *sym;
|
|
uint32_t *location;
|
|
|
|
DEBUGP("Applying relocate section %u to %u\n",
|
|
relsec, sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
|
/* This is where to make the change */
|
|
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rel[i].r_offset;
|
|
/* This is the symbol it is referring to. Note that all
|
|
undefined symbols have been resolved. */
|
|
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF32_R_SYM(rel[i].r_info);
|
|
|
|
switch (ELF32_R_TYPE(rel[i].r_info)) {
|
|
case R_386_32:
|
|
/* We add the value into the location given */
|
|
*location += sym->st_value;
|
|
break;
|
|
case R_386_PC32:
|
|
/* Add the value, subtract its position */
|
|
*location += sym->st_value - (uint32_t)location;
|
|
break;
|
|
default:
|
|
pr_err("%s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#else /*X86_64*/
|
|
int apply_relocate_add(Elf64_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
|
|
Elf64_Sym *sym;
|
|
void *loc;
|
|
u64 val;
|
|
|
|
DEBUGP("Applying relocate section %u to %u\n",
|
|
relsec, sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
|
/* This is where to make the change */
|
|
loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rel[i].r_offset;
|
|
|
|
/* This is the symbol it is referring to. Note that all
|
|
undefined symbols have been resolved. */
|
|
sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF64_R_SYM(rel[i].r_info);
|
|
|
|
DEBUGP("type %d st_value %Lx r_addend %Lx loc %Lx\n",
|
|
(int)ELF64_R_TYPE(rel[i].r_info),
|
|
sym->st_value, rel[i].r_addend, (u64)loc);
|
|
|
|
val = sym->st_value + rel[i].r_addend;
|
|
|
|
switch (ELF64_R_TYPE(rel[i].r_info)) {
|
|
case R_X86_64_NONE:
|
|
break;
|
|
case R_X86_64_64:
|
|
if (*(u64 *)loc != 0)
|
|
goto invalid_relocation;
|
|
*(u64 *)loc = val;
|
|
break;
|
|
case R_X86_64_32:
|
|
if (*(u32 *)loc != 0)
|
|
goto invalid_relocation;
|
|
*(u32 *)loc = val;
|
|
if (val != *(u32 *)loc)
|
|
goto overflow;
|
|
break;
|
|
case R_X86_64_32S:
|
|
if (*(s32 *)loc != 0)
|
|
goto invalid_relocation;
|
|
*(s32 *)loc = val;
|
|
if ((s64)val != *(s32 *)loc)
|
|
goto overflow;
|
|
break;
|
|
case R_X86_64_PC32:
|
|
case R_X86_64_PLT32:
|
|
if (*(u32 *)loc != 0)
|
|
goto invalid_relocation;
|
|
val -= (u64)loc;
|
|
*(u32 *)loc = val;
|
|
#if 0
|
|
if ((s64)val != *(s32 *)loc)
|
|
goto overflow;
|
|
#endif
|
|
break;
|
|
default:
|
|
pr_err("%s: Unknown rela relocation: %llu\n",
|
|
me->name, ELF64_R_TYPE(rel[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
invalid_relocation:
|
|
pr_err("x86/modules: Skipping invalid relocation target, existing value is nonzero for type %d, loc %p, val %Lx\n",
|
|
(int)ELF64_R_TYPE(rel[i].r_info), loc, val);
|
|
return -ENOEXEC;
|
|
|
|
overflow:
|
|
pr_err("overflow in relocation type %d val %Lx\n",
|
|
(int)ELF64_R_TYPE(rel[i].r_info), val);
|
|
pr_err("`%s' likely not compiled with -mcmodel=kernel\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
#endif
|
|
|
|
int module_finalize(const Elf_Ehdr *hdr,
|
|
const Elf_Shdr *sechdrs,
|
|
struct module *me)
|
|
{
|
|
const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,
|
|
*para = NULL, *orc = NULL, *orc_ip = NULL;
|
|
char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
|
|
|
for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
|
|
if (!strcmp(".text", secstrings + s->sh_name))
|
|
text = s;
|
|
if (!strcmp(".altinstructions", secstrings + s->sh_name))
|
|
alt = s;
|
|
if (!strcmp(".smp_locks", secstrings + s->sh_name))
|
|
locks = s;
|
|
if (!strcmp(".parainstructions", secstrings + s->sh_name))
|
|
para = s;
|
|
if (!strcmp(".orc_unwind", secstrings + s->sh_name))
|
|
orc = s;
|
|
if (!strcmp(".orc_unwind_ip", secstrings + s->sh_name))
|
|
orc_ip = s;
|
|
}
|
|
|
|
if (alt) {
|
|
/* patch .altinstructions */
|
|
void *aseg = (void *)alt->sh_addr;
|
|
apply_alternatives(aseg, aseg + alt->sh_size);
|
|
}
|
|
if (locks && text) {
|
|
void *lseg = (void *)locks->sh_addr;
|
|
void *tseg = (void *)text->sh_addr;
|
|
alternatives_smp_module_add(me, me->name,
|
|
lseg, lseg + locks->sh_size,
|
|
tseg, tseg + text->sh_size);
|
|
}
|
|
|
|
if (para) {
|
|
void *pseg = (void *)para->sh_addr;
|
|
apply_paravirt(pseg, pseg + para->sh_size);
|
|
}
|
|
|
|
/* make jump label nops */
|
|
jump_label_apply_nops(me);
|
|
|
|
if (orc && orc_ip)
|
|
unwind_module_init(me, (void *)orc_ip->sh_addr, orc_ip->sh_size,
|
|
(void *)orc->sh_addr, orc->sh_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void module_arch_cleanup(struct module *mod)
|
|
{
|
|
alternatives_smp_module_del(mod);
|
|
}
|