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authorLevin, Alexander (Sasha Levin) <alexander.levin@verizon.com>2017-11-16 04:36:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-16 05:21:05 +0300
commit4675ff05de2d76d167336b368bd07f3fef6ed5a6 (patch)
tree212d8adf40e13c2a27ac7834d14ca4900923b98c /arch/x86/mm
parentd8be75663cec0069b85f80191abd2682ce4a512f (diff)
downloadlinux-4675ff05de2d76d167336b368bd07f3fef6ed5a6.tar.xz
kmemcheck: rip it out
Fix up makefiles, remove references, and git rm kmemcheck. Link: http://lkml.kernel.org/r/20171007030159.22241-4-alexander.levin@verizon.com Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Vegard Nossum <vegardno@ifi.uio.no> Cc: Pekka Enberg <penberg@kernel.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Alexander Potapenko <glider@google.com> Cc: Tim Hansen <devtimhansen@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/Makefile2
-rw-r--r--arch/x86/mm/init.c5
-rw-r--r--arch/x86/mm/kmemcheck/Makefile1
-rw-r--r--arch/x86/mm/kmemcheck/error.c227
-rw-r--r--arch/x86/mm/kmemcheck/error.h15
-rw-r--r--arch/x86/mm/kmemcheck/kmemcheck.c658
-rw-r--r--arch/x86/mm/kmemcheck/opcode.c106
-rw-r--r--arch/x86/mm/kmemcheck/opcode.h9
-rw-r--r--arch/x86/mm/kmemcheck/pte.c22
-rw-r--r--arch/x86/mm/kmemcheck/pte.h10
-rw-r--r--arch/x86/mm/kmemcheck/selftest.c70
-rw-r--r--arch/x86/mm/kmemcheck/selftest.h6
-rw-r--r--arch/x86/mm/kmemcheck/shadow.c173
-rw-r--r--arch/x86/mm/kmemcheck/shadow.h18
14 files changed, 2 insertions, 1320 deletions
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 7ba7f3d7f477..8e13b8cc6bed 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -29,8 +29,6 @@ obj-$(CONFIG_X86_PTDUMP) += debug_pagetables.o
obj-$(CONFIG_HIGHMEM) += highmem_32.o
-obj-$(CONFIG_KMEMCHECK) += kmemcheck/
-
KASAN_SANITIZE_kasan_init_$(BITS).o := n
obj-$(CONFIG_KASAN) += kasan_init_$(BITS).o
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index ef94620ceb8a..6fdf91ef130a 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -163,12 +163,11 @@ static int page_size_mask;
static void __init probe_page_size_mask(void)
{
/*
- * For CONFIG_KMEMCHECK or pagealloc debugging, identity mapping will
- * use small pages.
+ * For pagealloc debugging, identity mapping will use small pages.
* This will simplify cpa(), which otherwise needs to support splitting
* large pages into small in interrupt context, etc.
*/
- if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled() && !IS_ENABLED(CONFIG_KMEMCHECK))
+ if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled())
page_size_mask |= 1 << PG_LEVEL_2M;
else
direct_gbpages = 0;
diff --git a/arch/x86/mm/kmemcheck/Makefile b/arch/x86/mm/kmemcheck/Makefile
deleted file mode 100644
index 520b3bce4095..000000000000
--- a/arch/x86/mm/kmemcheck/Makefile
+++ /dev/null
@@ -1 +0,0 @@
-obj-y := error.o kmemcheck.o opcode.o pte.o selftest.o shadow.o
diff --git a/arch/x86/mm/kmemcheck/error.c b/arch/x86/mm/kmemcheck/error.c
index 872ec4159a68..cec594032515 100644
--- a/arch/x86/mm/kmemcheck/error.c
+++ b/arch/x86/mm/kmemcheck/error.c
@@ -1,228 +1 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/interrupt.h>
-#include <linux/kdebug.h>
-#include <linux/kmemcheck.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/stacktrace.h>
-#include <linux/string.h>
-
-#include "error.h"
-#include "shadow.h"
-
-enum kmemcheck_error_type {
- KMEMCHECK_ERROR_INVALID_ACCESS,
- KMEMCHECK_ERROR_BUG,
-};
-
-#define SHADOW_COPY_SIZE (1 << CONFIG_KMEMCHECK_SHADOW_COPY_SHIFT)
-
-struct kmemcheck_error {
- enum kmemcheck_error_type type;
-
- union {
- /* KMEMCHECK_ERROR_INVALID_ACCESS */
- struct {
- /* Kind of access that caused the error */
- enum kmemcheck_shadow state;
- /* Address and size of the erroneous read */
- unsigned long address;
- unsigned int size;
- };
- };
-
- struct pt_regs regs;
- struct stack_trace trace;
- unsigned long trace_entries[32];
-
- /* We compress it to a char. */
- unsigned char shadow_copy[SHADOW_COPY_SIZE];
- unsigned char memory_copy[SHADOW_COPY_SIZE];
-};
-
-/*
- * Create a ring queue of errors to output. We can't call printk() directly
- * from the kmemcheck traps, since this may call the console drivers and
- * result in a recursive fault.
- */
-static struct kmemcheck_error error_fifo[CONFIG_KMEMCHECK_QUEUE_SIZE];
-static unsigned int error_count;
-static unsigned int error_rd;
-static unsigned int error_wr;
-static unsigned int error_missed_count;
-
-static struct kmemcheck_error *error_next_wr(void)
-{
- struct kmemcheck_error *e;
-
- if (error_count == ARRAY_SIZE(error_fifo)) {
- ++error_missed_count;
- return NULL;
- }
-
- e = &error_fifo[error_wr];
- if (++error_wr == ARRAY_SIZE(error_fifo))
- error_wr = 0;
- ++error_count;
- return e;
-}
-
-static struct kmemcheck_error *error_next_rd(void)
-{
- struct kmemcheck_error *e;
-
- if (error_count == 0)
- return NULL;
-
- e = &error_fifo[error_rd];
- if (++error_rd == ARRAY_SIZE(error_fifo))
- error_rd = 0;
- --error_count;
- return e;
-}
-
-void kmemcheck_error_recall(void)
-{
- static const char *desc[] = {
- [KMEMCHECK_SHADOW_UNALLOCATED] = "unallocated",
- [KMEMCHECK_SHADOW_UNINITIALIZED] = "uninitialized",
- [KMEMCHECK_SHADOW_INITIALIZED] = "initialized",
- [KMEMCHECK_SHADOW_FREED] = "freed",
- };
-
- static const char short_desc[] = {
- [KMEMCHECK_SHADOW_UNALLOCATED] = 'a',
- [KMEMCHECK_SHADOW_UNINITIALIZED] = 'u',
- [KMEMCHECK_SHADOW_INITIALIZED] = 'i',
- [KMEMCHECK_SHADOW_FREED] = 'f',
- };
-
- struct kmemcheck_error *e;
- unsigned int i;
-
- e = error_next_rd();
- if (!e)
- return;
-
- switch (e->type) {
- case KMEMCHECK_ERROR_INVALID_ACCESS:
- printk(KERN_WARNING "WARNING: kmemcheck: Caught %d-bit read from %s memory (%p)\n",
- 8 * e->size, e->state < ARRAY_SIZE(desc) ?
- desc[e->state] : "(invalid shadow state)",
- (void *) e->address);
-
- printk(KERN_WARNING);
- for (i = 0; i < SHADOW_COPY_SIZE; ++i)
- printk(KERN_CONT "%02x", e->memory_copy[i]);
- printk(KERN_CONT "\n");
-
- printk(KERN_WARNING);
- for (i = 0; i < SHADOW_COPY_SIZE; ++i) {
- if (e->shadow_copy[i] < ARRAY_SIZE(short_desc))
- printk(KERN_CONT " %c", short_desc[e->shadow_copy[i]]);
- else
- printk(KERN_CONT " ?");
- }
- printk(KERN_CONT "\n");
- printk(KERN_WARNING "%*c\n", 2 + 2
- * (int) (e->address & (SHADOW_COPY_SIZE - 1)), '^');
- break;
- case KMEMCHECK_ERROR_BUG:
- printk(KERN_EMERG "ERROR: kmemcheck: Fatal error\n");
- break;
- }
-
- __show_regs(&e->regs, 1);
- print_stack_trace(&e->trace, 0);
-}
-
-static void do_wakeup(unsigned long data)
-{
- while (error_count > 0)
- kmemcheck_error_recall();
-
- if (error_missed_count > 0) {
- printk(KERN_WARNING "kmemcheck: Lost %d error reports because "
- "the queue was too small\n", error_missed_count);
- error_missed_count = 0;
- }
-}
-
-static DECLARE_TASKLET(kmemcheck_tasklet, &do_wakeup, 0);
-
-/*
- * Save the context of an error report.
- */
-void kmemcheck_error_save(enum kmemcheck_shadow state,
- unsigned long address, unsigned int size, struct pt_regs *regs)
-{
- static unsigned long prev_ip;
-
- struct kmemcheck_error *e;
- void *shadow_copy;
- void *memory_copy;
-
- /* Don't report several adjacent errors from the same EIP. */
- if (regs->ip == prev_ip)
- return;
- prev_ip = regs->ip;
-
- e = error_next_wr();
- if (!e)
- return;
-
- e->type = KMEMCHECK_ERROR_INVALID_ACCESS;
-
- e->state = state;
- e->address = address;
- e->size = size;
-
- /* Save regs */
- memcpy(&e->regs, regs, sizeof(*regs));
-
- /* Save stack trace */
- e->trace.nr_entries = 0;
- e->trace.entries = e->trace_entries;
- e->trace.max_entries = ARRAY_SIZE(e->trace_entries);
- e->trace.skip = 0;
- save_stack_trace_regs(regs, &e->trace);
-
- /* Round address down to nearest 16 bytes */
- shadow_copy = kmemcheck_shadow_lookup(address
- & ~(SHADOW_COPY_SIZE - 1));
- BUG_ON(!shadow_copy);
-
- memcpy(e->shadow_copy, shadow_copy, SHADOW_COPY_SIZE);
-
- kmemcheck_show_addr(address);
- memory_copy = (void *) (address & ~(SHADOW_COPY_SIZE - 1));
- memcpy(e->memory_copy, memory_copy, SHADOW_COPY_SIZE);
- kmemcheck_hide_addr(address);
-
- tasklet_hi_schedule_first(&kmemcheck_tasklet);
-}
-
-/*
- * Save the context of a kmemcheck bug.
- */
-void kmemcheck_error_save_bug(struct pt_regs *regs)
-{
- struct kmemcheck_error *e;
-
- e = error_next_wr();
- if (!e)
- return;
-
- e->type = KMEMCHECK_ERROR_BUG;
-
- memcpy(&e->regs, regs, sizeof(*regs));
-
- e->trace.nr_entries = 0;
- e->trace.entries = e->trace_entries;
- e->trace.max_entries = ARRAY_SIZE(e->trace_entries);
- e->trace.skip = 1;
- save_stack_trace(&e->trace);
-
- tasklet_hi_schedule_first(&kmemcheck_tasklet);
-}
diff --git a/arch/x86/mm/kmemcheck/error.h b/arch/x86/mm/kmemcheck/error.h
index 39f80d7a874d..ea32a7d3cf1b 100644
--- a/arch/x86/mm/kmemcheck/error.h
+++ b/arch/x86/mm/kmemcheck/error.h
@@ -1,16 +1 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ARCH__X86__MM__KMEMCHECK__ERROR_H
-#define ARCH__X86__MM__KMEMCHECK__ERROR_H
-
-#include <linux/ptrace.h>
-
-#include "shadow.h"
-
-void kmemcheck_error_save(enum kmemcheck_shadow state,
- unsigned long address, unsigned int size, struct pt_regs *regs);
-
-void kmemcheck_error_save_bug(struct pt_regs *regs);
-
-void kmemcheck_error_recall(void);
-
-#endif
diff --git a/arch/x86/mm/kmemcheck/kmemcheck.c b/arch/x86/mm/kmemcheck/kmemcheck.c
deleted file mode 100644
index 4515bae36bbe..000000000000
--- a/arch/x86/mm/kmemcheck/kmemcheck.c
+++ /dev/null
@@ -1,658 +0,0 @@
-/**
- * kmemcheck - a heavyweight memory checker for the linux kernel
- * Copyright (C) 2007, 2008 Vegard Nossum <vegardno@ifi.uio.no>
- * (With a lot of help from Ingo Molnar and Pekka Enberg.)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License (version 2) as
- * published by the Free Software Foundation.
- */
-
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/kallsyms.h>
-#include <linux/kernel.h>
-#include <linux/kmemcheck.h>
-#include <linux/mm.h>
-#include <linux/page-flags.h>
-#include <linux/percpu.h>
-#include <linux/ptrace.h>
-#include <linux/string.h>
-#include <linux/types.h>
-
-#include <asm/cacheflush.h>
-#include <asm/kmemcheck.h>
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-
-#include "error.h"
-#include "opcode.h"
-#include "pte.h"
-#include "selftest.h"
-#include "shadow.h"
-
-
-#ifdef CONFIG_KMEMCHECK_DISABLED_BY_DEFAULT
-# define KMEMCHECK_ENABLED 0
-#endif
-
-#ifdef CONFIG_KMEMCHECK_ENABLED_BY_DEFAULT
-# define KMEMCHECK_ENABLED 1
-#endif
-
-#ifdef CONFIG_KMEMCHECK_ONESHOT_BY_DEFAULT
-# define KMEMCHECK_ENABLED 2
-#endif
-
-int kmemcheck_enabled = KMEMCHECK_ENABLED;
-
-int __init kmemcheck_init(void)
-{
-#ifdef CONFIG_SMP
- /*
- * Limit SMP to use a single CPU. We rely on the fact that this code
- * runs before SMP is set up.
- */
- if (setup_max_cpus > 1) {
- printk(KERN_INFO
- "kmemcheck: Limiting number of CPUs to 1.\n");
- setup_max_cpus = 1;
- }
-#endif
-
- if (!kmemcheck_selftest()) {
- printk(KERN_INFO "kmemcheck: self-tests failed; disabling\n");
- kmemcheck_enabled = 0;
- return -EINVAL;
- }
-
- printk(KERN_INFO "kmemcheck: Initialized\n");
- return 0;
-}
-
-early_initcall(kmemcheck_init);
-
-/*
- * We need to parse the kmemcheck= option before any memory is allocated.
- */
-static int __init param_kmemcheck(char *str)
-{
- int val;
- int ret;
-
- if (!str)
- return -EINVAL;
-
- ret = kstrtoint(str, 0, &val);
- if (ret)
- return ret;
- kmemcheck_enabled = val;
- return 0;
-}
-
-early_param("kmemcheck", param_kmemcheck);
-
-int kmemcheck_show_addr(unsigned long address)
-{
- pte_t *pte;
-
- pte = kmemcheck_pte_lookup(address);
- if (!pte)
- return 0;
-
- set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
- __flush_tlb_one(address);
- return 1;
-}
-
-int kmemcheck_hide_addr(unsigned long address)
-{
- pte_t *pte;
-
- pte = kmemcheck_pte_lookup(address);
- if (!pte)
- return 0;
-
- set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
- __flush_tlb_one(address);
- return 1;
-}
-
-struct kmemcheck_context {
- bool busy;
- int balance;
-
- /*
- * There can be at most two memory operands to an instruction, but
- * each address can cross a page boundary -- so we may need up to
- * four addresses that must be hidden/revealed for each fault.
- */
- unsigned long addr[4];
- unsigned long n_addrs;
- unsigned long flags;
-
- /* Data size of the instruction that caused a fault. */
- unsigned int size;
-};
-
-static DEFINE_PER_CPU(struct kmemcheck_context, kmemcheck_context);
-
-bool kmemcheck_active(struct pt_regs *regs)
-{
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
-
- return data->balance > 0;
-}
-
-/* Save an address that needs to be shown/hidden */
-static void kmemcheck_save_addr(unsigned long addr)
-{
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
-
- BUG_ON(data->n_addrs >= ARRAY_SIZE(data->addr));
- data->addr[data->n_addrs++] = addr;
-}
-
-static unsigned int kmemcheck_show_all(void)
-{
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
- unsigned int i;
- unsigned int n;
-
- n = 0;
- for (i = 0; i < data->n_addrs; ++i)
- n += kmemcheck_show_addr(data->addr[i]);
-
- return n;
-}
-
-static unsigned int kmemcheck_hide_all(void)
-{
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
- unsigned int i;
- unsigned int n;
-
- n = 0;
- for (i = 0; i < data->n_addrs; ++i)
- n += kmemcheck_hide_addr(data->addr[i]);
-
- return n;
-}
-
-/*
- * Called from the #PF handler.
- */
-void kmemcheck_show(struct pt_regs *regs)
-{
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
-
- BUG_ON(!irqs_disabled());
-
- if (unlikely(data->balance != 0)) {
- kmemcheck_show_all();
- kmemcheck_error_save_bug(regs);
- data->balance = 0;
- return;
- }
-
- /*
- * None of the addresses actually belonged to kmemcheck. Note that
- * this is not an error.
- */
- if (kmemcheck_show_all() == 0)
- return;
-
- ++data->balance;
-
- /*
- * The IF needs to be cleared as well, so that the faulting
- * instruction can run "uninterrupted". Otherwise, we might take
- * an interrupt and start executing that before we've had a chance
- * to hide the page again.
- *
- * NOTE: In the rare case of multiple faults, we must not override
- * the original flags:
- */
- if (!(regs->flags & X86_EFLAGS_TF))
- data->flags = regs->flags;
-
- regs->flags |= X86_EFLAGS_TF;
- regs->flags &= ~X86_EFLAGS_IF;
-}
-
-/*
- * Called from the #DB handler.
- */
-void kmemcheck_hide(struct pt_regs *regs)
-{
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
- int n;
-
- BUG_ON(!irqs_disabled());
-
- if (unlikely(data->balance != 1)) {
- kmemcheck_show_all();
- kmemcheck_error_save_bug(regs);
- data->n_addrs = 0;
- data->balance = 0;
-
- if (!(data->flags & X86_EFLAGS_TF))
- regs->flags &= ~X86_EFLAGS_TF;
- if (data->flags & X86_EFLAGS_IF)
- regs->flags |= X86_EFLAGS_IF;
- return;
- }
-
- if (kmemcheck_enabled)
- n = kmemcheck_hide_all();
- else
- n = kmemcheck_show_all();
-
- if (n == 0)
- return;
-
- --data->balance;
-
- data->n_addrs = 0;
-
- if (!(data->flags & X86_EFLAGS_TF))
- regs->flags &= ~X86_EFLAGS_TF;
- if (data->flags & X86_EFLAGS_IF)
- regs->flags |= X86_EFLAGS_IF;
-}
-
-void kmemcheck_show_pages(struct page *p, unsigned int n)
-{
- unsigned int i;
-
- for (i = 0; i < n; ++i) {
- unsigned long address;
- pte_t *pte;
- unsigned int level;
-
- address = (unsigned long) page_address(&p[i]);
- pte = lookup_address(address, &level);
- BUG_ON(!pte);
- BUG_ON(level != PG_LEVEL_4K);
-
- set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
- set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_HIDDEN));
- __flush_tlb_one(address);
- }
-}
-
-bool kmemcheck_page_is_tracked(struct page *p)
-{
- /* This will also check the "hidden" flag of the PTE. */
- return kmemcheck_pte_lookup((unsigned long) page_address(p));
-}
-
-void kmemcheck_hide_pages(struct page *p, unsigned int n)
-{
- unsigned int i;
-
- for (i = 0; i < n; ++i) {
- unsigned long address;
- pte_t *pte;
- unsigned int level;
-
- address = (unsigned long) page_address(&p[i]);
- pte = lookup_address(address, &level);
- BUG_ON(!pte);
- BUG_ON(level != PG_LEVEL_4K);
-
- set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
- set_pte(pte, __pte(pte_val(*pte) | _PAGE_HIDDEN));
- __flush_tlb_one(address);
- }
-}
-
-/* Access may NOT cross page boundary */
-static void kmemcheck_read_strict(struct pt_regs *regs,
- unsigned long addr, unsigned int size)
-{
- void *shadow;
- enum kmemcheck_shadow status;
-
- shadow = kmemcheck_shadow_lookup(addr);
- if (!shadow)
- return;
-
- kmemcheck_save_addr(addr);
- status = kmemcheck_shadow_test(shadow, size);
- if (status == KMEMCHECK_SHADOW_INITIALIZED)
- return;
-
- if (kmemcheck_enabled)
- kmemcheck_error_save(status, addr, size, regs);
-
- if (kmemcheck_enabled == 2)
- kmemcheck_enabled = 0;
-
- /* Don't warn about it again. */
- kmemcheck_shadow_set(shadow, size);
-}
-
-bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size)
-{
- enum kmemcheck_shadow status;
- void *shadow;
-
- shadow = kmemcheck_shadow_lookup(addr);
- if (!shadow)
- return true;
-
- status = kmemcheck_shadow_test_all(shadow, size);
-
- return status == KMEMCHECK_SHADOW_INITIALIZED;
-}
-
-/* Access may cross page boundary */
-static void kmemcheck_read(struct pt_regs *regs,
- unsigned long addr, unsigned int size)
-{
- unsigned long page = addr & PAGE_MASK;
- unsigned long next_addr = addr + size - 1;
- unsigned long next_page = next_addr & PAGE_MASK;
-
- if (likely(page == next_page)) {
- kmemcheck_read_strict(regs, addr, size);
- return;
- }
-
- /*
- * What we do is basically to split the access across the
- * two pages and handle each part separately. Yes, this means
- * that we may now see reads that are 3 + 5 bytes, for
- * example (and if both are uninitialized, there will be two
- * reports), but it makes the code a lot simpler.
- */
- kmemcheck_read_strict(regs, addr, next_page - addr);
- kmemcheck_read_strict(regs, next_page, next_addr - next_page);
-}
-
-static void kmemcheck_write_strict(struct pt_regs *regs,
- unsigned long addr, unsigned int size)
-{
- void *shadow;
-
- shadow = kmemcheck_shadow_lookup(addr);
- if (!shadow)
- return;
-
- kmemcheck_save_addr(addr);
- kmemcheck_shadow_set(shadow, size);
-}
-
-static void kmemcheck_write(struct pt_regs *regs,
- unsigned long addr, unsigned int size)
-{
- unsigned long page = addr & PAGE_MASK;
- unsigned long next_addr = addr + size - 1;
- unsigned long next_page = next_addr & PAGE_MASK;
-
- if (likely(page == next_page)) {
- kmemcheck_write_strict(regs, addr, size);
- return;
- }
-
- /* See comment in kmemcheck_read(). */
- kmemcheck_write_strict(regs, addr, next_page - addr);
- kmemcheck_write_strict(regs, next_page, next_addr - next_page);
-}
-
-/*
- * Copying is hard. We have two addresses, each of which may be split across
- * a page (and each page will have different shadow addresses).
- */
-static void kmemcheck_copy(struct pt_regs *regs,
- unsigned long src_addr, unsigned long dst_addr, unsigned int size)
-{
- uint8_t shadow[8];
- enum kmemcheck_shadow status;
-
- unsigned long page;
- unsigned long next_addr;
- unsigned long next_page;
-
- uint8_t *x;
- unsigned int i;
- unsigned int n;
-
- BUG_ON(size > sizeof(shadow));
-
- page = src_addr & PAGE_MASK;
- next_addr = src_addr + size - 1;
- next_page = next_addr & PAGE_MASK;
-
- if (likely(page == next_page)) {
- /* Same page */
- x = kmemcheck_shadow_lookup(src_addr);
- if (x) {
- kmemcheck_save_addr(src_addr);
- for (i = 0; i < size; ++i)
- shadow[i] = x[i];
- } else {
- for (i = 0; i < size; ++i)
- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
- }
- } else {
- n = next_page - src_addr;
- BUG_ON(n > sizeof(shadow));
-
- /* First page */
- x = kmemcheck_shadow_lookup(src_addr);
- if (x) {
- kmemcheck_save_addr(src_addr);
- for (i = 0; i < n; ++i)
- shadow[i] = x[i];
- } else {
- /* Not tracked */
- for (i = 0; i < n; ++i)
- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
- }
-
- /* Second page */
- x = kmemcheck_shadow_lookup(next_page);
- if (x) {
- kmemcheck_save_addr(next_page);
- for (i = n; i < size; ++i)
- shadow[i] = x[i - n];
- } else {
- /* Not tracked */
- for (i = n; i < size; ++i)
- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
- }
- }
-
- page = dst_addr & PAGE_MASK;
- next_addr = dst_addr + size - 1;
- next_page = next_addr & PAGE_MASK;
-
- if (likely(page == next_page)) {
- /* Same page */
- x = kmemcheck_shadow_lookup(dst_addr);
- if (x) {
- kmemcheck_save_addr(dst_addr);
- for (i = 0; i < size; ++i) {
- x[i] = shadow[i];
- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
- }
- }
- } else {
- n = next_page - dst_addr;
- BUG_ON(n > sizeof(shadow));
-
- /* First page */
- x = kmemcheck_shadow_lookup(dst_addr);
- if (x) {
- kmemcheck_save_addr(dst_addr);
- for (i = 0; i < n; ++i) {
- x[i] = shadow[i];
- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
- }
- }
-
- /* Second page */
- x = kmemcheck_shadow_lookup(next_page);
- if (x) {
- kmemcheck_save_addr(next_page);
- for (i = n; i < size; ++i) {
- x[i - n] = shadow[i];
- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
- }
- }
- }
-
- status = kmemcheck_shadow_test(shadow, size);
- if (status == KMEMCHECK_SHADOW_INITIALIZED)
- return;
-
- if (kmemcheck_enabled)
- kmemcheck_error_save(status, src_addr, size, regs);
-
- if (kmemcheck_enabled == 2)
- kmemcheck_enabled = 0;
-}
-
-enum kmemcheck_method {
- KMEMCHECK_READ,
- KMEMCHECK_WRITE,
-};
-
-static void kmemcheck_access(struct pt_regs *regs,
- unsigned long fallback_address, enum kmemcheck_method fallback_method)
-{
- const uint8_t *insn;
- const uint8_t *insn_primary;
- unsigned int size;
-
- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
-
- /* Recursive fault -- ouch. */
- if (data->busy) {
- kmemcheck_show_addr(fallback_address);
- kmemcheck_error_save_bug(regs);
- return;
- }
-
- data->busy = true;
-
- insn = (const uint8_t *) regs->ip;
- insn_primary = kmemcheck_opcode_get_primary(insn);
-
- kmemcheck_opcode_decode(insn, &size);
-
- switch (insn_primary[0]) {
-#ifdef CONFIG_KMEMCHECK_BITOPS_OK
- /* AND, OR, XOR */
- /*
- * Unfortunately, these instructions have to be excluded from
- * our regular checking since they access only some (and not
- * all) bits. This clears out "bogus" bitfield-access warnings.
- */
- case 0x80:
- case 0x81:
- case 0x82:
- case 0x83:
- switch ((insn_primary[1] >> 3) & 7) {
- /* OR */
- case 1:
- /* AND */
- case 4:
- /* XOR */
- case 6:
- kmemcheck_write(regs, fallback_address, size);
- goto out;
-
- /* ADD */
- case 0:
- /* ADC */
- case 2:
- /* SBB */
- case 3:
- /* SUB */
- case 5:
- /* CMP */
- case 7:
- break;
- }
- break;
-#endif
-
- /* MOVS, MOVSB, MOVSW, MOVSD */
- case 0xa4:
- case 0xa5:
- /*
- * These instructions are special because they take two
- * addresses, but we only get one page fault.
- */
- kmemcheck_copy(regs, regs->si, regs->di, size);
- goto out;
-
- /* CMPS, CMPSB, CMPSW, CMPSD */
- case 0xa6:
- case 0xa7:
- kmemcheck_read(regs, regs->si, size);
- kmemcheck_read(regs, regs->di, size);
- goto out;
- }
-
- /*
- * If the opcode isn't special in any way, we use the data from the
- * page fault handler to determine the address and type of memory
- * access.
- */
- switch (fallback_method) {
- case KMEMCHECK_READ:
- kmemcheck_read(regs, fallback_address, size);
- goto out;
- case KMEMCHECK_WRITE:
- kmemcheck_write(regs, fallback_address, size);
- goto out;
- }
-
-out:
- data->busy = false;
-}
-
-bool kmemcheck_fault(struct pt_regs *regs, unsigned long address,
- unsigned long error_code)
-{
- pte_t *pte;
-
- /*
- * XXX: Is it safe to assume that memory accesses from virtual 86
- * mode or non-kernel code segments will _never_ access kernel
- * memory (e.g. tracked pages)? For now, we need this to avoid
- * invoking kmemcheck for PnP BIOS calls.
- */
- if (regs->flags & X86_VM_MASK)
- return false;
- if (regs->cs != __KERNEL_CS)
- return false;
-
- pte = kmemcheck_pte_lookup(address);
- if (!pte)
- return false;
-
- WARN_ON_ONCE(in_nmi());
-
- if (error_code & 2)
- kmemcheck_access(regs, address, KMEMCHECK_WRITE);
- else
- kmemcheck_access(regs, address, KMEMCHECK_READ);
-
- kmemcheck_show(regs);
- return true;
-}
-
-bool kmemcheck_trap(struct pt_regs *regs)
-{
- if (!kmemcheck_active(regs))
- return false;
-
- /* We're done. */
- kmemcheck_hide(regs);
- return true;
-}
diff --git a/arch/x86/mm/kmemcheck/opcode.c b/arch/x86/mm/kmemcheck/opcode.c
index df8109ddf7fe..cec594032515 100644
--- a/arch/x86/mm/kmemcheck/opcode.c
+++ b/arch/x86/mm/kmemcheck/opcode.c
@@ -1,107 +1 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/types.h>
-
-#include "opcode.h"
-
-static bool opcode_is_prefix(uint8_t b)
-{
- return
- /* Group 1 */
- b == 0xf0 || b == 0xf2 || b == 0xf3
- /* Group 2 */
- || b == 0x2e || b == 0x36 || b == 0x3e || b == 0x26
- || b == 0x64 || b == 0x65
- /* Group 3 */
- || b == 0x66
- /* Group 4 */
- || b == 0x67;
-}
-
-#ifdef CONFIG_X86_64
-static bool opcode_is_rex_prefix(uint8_t b)
-{
- return (b & 0xf0) == 0x40;
-}
-#else
-static bool opcode_is_rex_prefix(uint8_t b)
-{
- return false;
-}
-#endif
-
-#define REX_W (1 << 3)
-
-/*
- * This is a VERY crude opcode decoder. We only need to find the size of the
- * load/store that caused our #PF and this should work for all the opcodes
- * that we care about. Moreover, the ones who invented this instruction set
- * should be shot.
- */
-void kmemcheck_opcode_decode(const uint8_t *op, unsigned int *size)
-{
- /* Default operand size */
- int operand_size_override = 4;
-
- /* prefixes */
- for (; opcode_is_prefix(*op); ++op) {
- if (*op == 0x66)
- operand_size_override = 2;
- }
-
- /* REX prefix */
- if (opcode_is_rex_prefix(*op)) {
- uint8_t rex = *op;
-
- ++op;
- if (rex & REX_W) {
- switch (*op) {
- case 0x63:
- *size = 4;
- return;
- case 0x0f:
- ++op;
-
- switch (*op) {
- case 0xb6:
- case 0xbe:
- *size = 1;
- return;
- case 0xb7:
- case 0xbf:
- *size = 2;
- return;
- }
-
- break;
- }
-
- *size = 8;
- return;
- }
- }
-
- /* escape opcode */
- if (*op == 0x0f) {
- ++op;
-
- /*
- * This is move with zero-extend and sign-extend, respectively;
- * we don't have to think about 0xb6/0xbe, because this is
- * already handled in the conditional below.
- */
- if (*op == 0xb7 || *op == 0xbf)
- operand_size_override = 2;
- }
-
- *size = (*op & 1) ? operand_size_override : 1;
-}
-
-const uint8_t *kmemcheck_opcode_get_primary(const uint8_t *op)
-{
- /* skip prefixes */
- while (opcode_is_prefix(*op))
- ++op;
- if (opcode_is_rex_prefix(*op))
- ++op;
- return op;
-}
diff --git a/arch/x86/mm/kmemcheck/opcode.h b/arch/x86/mm/kmemcheck/opcode.h
index 51a1ce94c24a..ea32a7d3cf1b 100644
--- a/arch/x86/mm/kmemcheck/opcode.h
+++ b/arch/x86/mm/kmemcheck/opcode.h
@@ -1,10 +1 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ARCH__X86__MM__KMEMCHECK__OPCODE_H
-#define ARCH__X86__MM__KMEMCHECK__OPCODE_H
-
-#include <linux/types.h>
-
-void kmemcheck_opcode_decode(const uint8_t *op, unsigned int *size);
-const uint8_t *kmemcheck_opcode_get_primary(const uint8_t *op);
-
-#endif
diff --git a/arch/x86/mm/kmemcheck/pte.c b/arch/x86/mm/kmemcheck/pte.c
index 8a03be90272a..cec594032515 100644
--- a/arch/x86/mm/kmemcheck/pte.c
+++ b/arch/x86/mm/kmemcheck/pte.c
@@ -1,23 +1 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/mm.h>
-
-#include <asm/pgtable.h>
-
-#include "pte.h"
-
-pte_t *kmemcheck_pte_lookup(unsigned long address)
-{
- pte_t *pte;
- unsigned int level;
-
- pte = lookup_address(address, &level);
- if (!pte)
- return NULL;
- if (level != PG_LEVEL_4K)
- return NULL;
- if (!pte_hidden(*pte))
- return NULL;
-
- return pte;
-}
-
diff --git a/arch/x86/mm/kmemcheck/pte.h b/arch/x86/mm/kmemcheck/pte.h
index b595612382c2..ea32a7d3cf1b 100644
--- a/arch/x86/mm/kmemcheck/pte.h
+++ b/arch/x86/mm/kmemcheck/pte.h
@@ -1,11 +1 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ARCH__X86__MM__KMEMCHECK__PTE_H
-#define ARCH__X86__MM__KMEMCHECK__PTE_H
-
-#include <linux/mm.h>
-
-#include <asm/pgtable.h>
-
-pte_t *kmemcheck_pte_lookup(unsigned long address);
-
-#endif
diff --git a/arch/x86/mm/kmemcheck/selftest.c b/arch/x86/mm/kmemcheck/selftest.c
index 7ce0be1f99eb..cec594032515 100644
--- a/arch/x86/mm/kmemcheck/selftest.c
+++ b/arch/x86/mm/kmemcheck/selftest.c
@@ -1,71 +1 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/bug.h>
-#include <linux/kernel.h>
-
-#include "opcode.h"
-#include "selftest.h"
-
-struct selftest_opcode {
- unsigned int expected_size;
- const uint8_t *insn;
- const char *desc;
-};
-
-static const struct selftest_opcode selftest_opcodes[] = {
- /* REP MOVS */
- {1, "\xf3\xa4", "rep movsb <mem8>, <mem8>"},
- {4, "\xf3\xa5", "rep movsl <mem32>, <mem32>"},
-
- /* MOVZX / MOVZXD */
- {1, "\x66\x0f\xb6\x51\xf8", "movzwq <mem8>, <reg16>"},
- {1, "\x0f\xb6\x51\xf8", "movzwq <mem8>, <reg32>"},
-
- /* MOVSX / MOVSXD */
- {1, "\x66\x0f\xbe\x51\xf8", "movswq <mem8>, <reg16>"},
- {1, "\x0f\xbe\x51\xf8", "movswq <mem8>, <reg32>"},
-
-#ifdef CONFIG_X86_64
- /* MOVZX / MOVZXD */
- {1, "\x49\x0f\xb6\x51\xf8", "movzbq <mem8>, <reg64>"},
- {2, "\x49\x0f\xb7\x51\xf8", "movzbq <mem16>, <reg64>"},
-
- /* MOVSX / MOVSXD */
- {1, "\x49\x0f\xbe\x51\xf8", "movsbq <mem8>, <reg64>"},
- {2, "\x49\x0f\xbf\x51\xf8", "movsbq <mem16>, <reg64>"},
- {4, "\x49\x63\x51\xf8", "movslq <mem32>, <reg64>"},
-#endif
-};
-
-static bool selftest_opcode_one(const struct selftest_opcode *op)
-{
- unsigned size;
-
- kmemcheck_opcode_decode(op->insn, &size);
-
- if (size == op->expected_size)
- return true;
-
- printk(KERN_WARNING "kmemcheck: opcode %s: expected size %d, got %d\n",
- op->desc, op->expected_size, size);
- return false;
-}
-
-static bool selftest_opcodes_all(void)
-{
- bool pass = true;
- unsigned int i;
-
- for (i = 0; i < ARRAY_SIZE(selftest_opcodes); ++i)
- pass = pass && selftest_opcode_one(&selftest_opcodes[i]);
-
- return pass;
-}
-
-bool kmemcheck_selftest(void)
-{
- bool pass = true;
-
- pass = pass && selftest_opcodes_all();
-
- return pass;
-}
diff --git a/arch/x86/mm/kmemcheck/selftest.h b/arch/x86/mm/kmemcheck/selftest.h
index 8d759aae453d..ea32a7d3cf1b 100644
--- a/arch/x86/mm/kmemcheck/selftest.h
+++ b/arch/x86/mm/kmemcheck/selftest.h
@@ -1,7 +1 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ARCH_X86_MM_KMEMCHECK_SELFTEST_H
-#define ARCH_X86_MM_KMEMCHECK_SELFTEST_H
-
-bool kmemcheck_selftest(void);
-
-#endif
diff --git a/arch/x86/mm/kmemcheck/shadow.c b/arch/x86/mm/kmemcheck/shadow.c
deleted file mode 100644
index c2638a7d2c10..000000000000
--- a/arch/x86/mm/kmemcheck/shadow.c
+++ /dev/null
@@ -1,173 +0,0 @@
-#include <linux/kmemcheck.h>
-#include <linux/export.h>
-#include <linux/mm.h>
-
-#include <asm/page.h>
-#include <asm/pgtable.h>
-
-#include "pte.h"
-#include "shadow.h"
-
-/*
- * Return the shadow address for the given address. Returns NULL if the
- * address is not tracked.
- *
- * We need to be extremely careful not to follow any invalid pointers,
- * because this function can be called for *any* possible address.
- */
-void *kmemcheck_shadow_lookup(unsigned long address)
-{
- pte_t *pte;
- struct page *page;
-
- if (!virt_addr_valid(address))
- return NULL;
-
- pte = kmemcheck_pte_lookup(address);
- if (!pte)
- return NULL;
-
- page = virt_to_page(address);
- if (!page->shadow)
- return NULL;
- return page->shadow + (address & (PAGE_SIZE - 1));
-}
-
-static void mark_shadow(void *address, unsigned int n,
- enum kmemcheck_shadow status)
-{
- unsigned long addr = (unsigned long) address;
- unsigned long last_addr = addr + n - 1;
- unsigned long page = addr & PAGE_MASK;
- unsigned long last_page = last_addr & PAGE_MASK;
- unsigned int first_n;
- void *shadow;
-
- /* If the memory range crosses a page boundary, stop there. */
- if (page == last_page)
- first_n = n;
- else
- first_n = page + PAGE_SIZE - addr;
-
- shadow = kmemcheck_shadow_lookup(addr);
- if (shadow)
- memset(shadow, status, first_n);
-
- addr += first_n;
- n -= first_n;
-
- /* Do full-page memset()s. */
- while (n >= PAGE_SIZE) {
- shadow = kmemcheck_shadow_lookup(addr);
- if (shadow)
- memset(shadow, status, PAGE_SIZE);
-
- addr += PAGE_SIZE;
- n -= PAGE_SIZE;
- }
-
- /* Do the remaining page, if any. */
- if (n > 0) {
- shadow = kmemcheck_shadow_lookup(addr);
- if (shadow)
- memset(shadow, status, n);
- }
-}
-
-void kmemcheck_mark_unallocated(void *address, unsigned int n)
-{
- mark_shadow(address, n, KMEMCHECK_SHADOW_UNALLOCATED);
-}
-
-void kmemcheck_mark_uninitialized(void *address, unsigned int n)
-{
- mark_shadow(address, n, KMEMCHECK_SHADOW_UNINITIALIZED);
-}
-
-/*
- * Fill the shadow memory of the given address such that the memory at that
- * address is marked as being initialized.
- */
-void kmemcheck_mark_initialized(void *address, unsigned int n)
-{
- mark_shadow(address, n, KMEMCHECK_SHADOW_INITIALIZED);
-}
-EXPORT_SYMBOL_GPL(kmemcheck_mark_initialized);
-
-void kmemcheck_mark_freed(void *address, unsigned int n)
-{
- mark_shadow(address, n, KMEMCHECK_SHADOW_FREED);
-}
-
-void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n)
-{
- unsigned int i;
-
- for (i = 0; i < n; ++i)
- kmemcheck_mark_unallocated(page_address(&p[i]), PAGE_SIZE);
-}
-
-void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n)
-{
- unsigned int i;
-
- for (i = 0; i < n; ++i)
- kmemcheck_mark_uninitialized(page_address(&p[i]), PAGE_SIZE);
-}
-
-void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n)
-{
- unsigned int i;
-
- for (i = 0; i < n; ++i)
- kmemcheck_mark_initialized(page_address(&p[i]), PAGE_SIZE);
-}
-
-enum kmemcheck_shadow kmemcheck_shadow_test(void *shadow, unsigned int size)
-{
-#ifdef CONFIG_KMEMCHECK_PARTIAL_OK
- uint8_t *x;
- unsigned int i;
-
- x = shadow;
-
- /*
- * Make sure _some_ bytes are initialized. Gcc frequently generates
- * code to access neighboring bytes.
- */
- for (i = 0; i < size; ++i) {
- if (x[i] == KMEMCHECK_SHADOW_INITIALIZED)
- return x[i];
- }
-
- return x[0];
-#else
- return kmemcheck_shadow_test_all(shadow, size);
-#endif
-}
-
-enum kmemcheck_shadow kmemcheck_shadow_test_all(void *shadow, unsigned int size)
-{
- uint8_t *x;
- unsigned int i;
-
- x = shadow;
-
- /* All bytes must be initialized. */
- for (i = 0; i < size; ++i) {
- if (x[i] != KMEMCHECK_SHADOW_INITIALIZED)
- return x[i];
- }
-
- return x[0];
-}
-
-void kmemcheck_shadow_set(void *shadow, unsigned int size)
-{
- uint8_t *x;
- unsigned int i;
-
- x = shadow;
- for (i = 0; i < size; ++i)
- x[i] = KMEMCHECK_SHADOW_INITIALIZED;
-}
diff --git a/arch/x86/mm/kmemcheck/shadow.h b/arch/x86/mm/kmemcheck/shadow.h
index 49768dc18664..ea32a7d3cf1b 100644
--- a/arch/x86/mm/kmemcheck/shadow.h
+++ b/arch/x86/mm/kmemcheck/shadow.h
@@ -1,19 +1 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ARCH__X86__MM__KMEMCHECK__SHADOW_H
-#define ARCH__X86__MM__KMEMCHECK__SHADOW_H
-
-enum kmemcheck_shadow {
- KMEMCHECK_SHADOW_UNALLOCATED,
- KMEMCHECK_SHADOW_UNINITIALIZED,
- KMEMCHECK_SHADOW_INITIALIZED,
- KMEMCHECK_SHADOW_FREED,
-};
-
-void *kmemcheck_shadow_lookup(unsigned long address);
-
-enum kmemcheck_shadow kmemcheck_shadow_test(void *shadow, unsigned int size);
-enum kmemcheck_shadow kmemcheck_shadow_test_all(void *shadow,
- unsigned int size);
-void kmemcheck_shadow_set(void *shadow, unsigned int size);
-
-#endif