mm/page_poison.c: enable PAGE_POISONING as a separate option

Page poisoning is currently set up as a feature if architectures don't
have architecture debug page_alloc to allow unmapping of pages.  It has
uses apart from that though.  Clearing of the pages on free provides an
increase in security as it helps to limit the risk of information leaks.
Allow page poisoning to be enabled as a separate option independent of
kernel_map pages since the two features do separate work.  Because of
how hiberanation is implemented, the checks on alloc cannot occur if
hibernation is enabled.  The runtime alloc checks can also be enabled
with an option when !HIBERNATION.

Credit to Grsecurity/PaX team for inspiring this work

Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jianyu Zhan <nasa4836@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 137 deletions

diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
deleted file mode 100644
index 5bf5906ce13b..000000000000
--- a/mm/debug-pagealloc.c
+++ /dev/null
@@ -1,137 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/highmem.h>
-#include <linux/page_ext.h>
-#include <linux/poison.h>
-#include <linux/ratelimit.h>
-
-static bool page_poisoning_enabled __read_mostly;
-
-static bool need_page_poisoning(void)
-{
-	if (!debug_pagealloc_enabled())
-		return false;
-
-	return true;
-}
-
-static void init_page_poisoning(void)
-{
-	if (!debug_pagealloc_enabled())
-		return;
-
-	page_poisoning_enabled = true;
-}
-
-struct page_ext_operations page_poisoning_ops = {
-	.need = need_page_poisoning,
-	.init = init_page_poisoning,
-};
-
-static inline void set_page_poison(struct page *page)
-{
-	struct page_ext *page_ext;
-
-	page_ext = lookup_page_ext(page);
-	__set_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags);
-}
-
-static inline void clear_page_poison(struct page *page)
-{
-	struct page_ext *page_ext;
-
-	page_ext = lookup_page_ext(page);
-	__clear_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags);
-}
-
-static inline bool page_poison(struct page *page)
-{
-	struct page_ext *page_ext;
-
-	page_ext = lookup_page_ext(page);
-	return test_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags);
-}
-
-static void poison_page(struct page *page)
-{
-	void *addr = kmap_atomic(page);
-
-	set_page_poison(page);
-	memset(addr, PAGE_POISON, PAGE_SIZE);
-	kunmap_atomic(addr);
-}
-
-static void poison_pages(struct page *page, int n)
-{
-	int i;
-
-	for (i = 0; i < n; i++)
-		poison_page(page + i);
-}
-
-static bool single_bit_flip(unsigned char a, unsigned char b)
-{
-	unsigned char error = a ^ b;
-
-	return error && !(error & (error - 1));
-}
-
-static void check_poison_mem(unsigned char *mem, size_t bytes)
-{
-	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 10);
-	unsigned char *start;
-	unsigned char *end;
-
-	start = memchr_inv(mem, PAGE_POISON, bytes);
-	if (!start)
-		return;
-
-	for (end = mem + bytes - 1; end > start; end--) {
-		if (*end != PAGE_POISON)
-			break;
-	}
-
-	if (!__ratelimit(&ratelimit))
-		return;
-	else if (start == end && single_bit_flip(*start, PAGE_POISON))
-		printk(KERN_ERR "pagealloc: single bit error\n");
-	else
-		printk(KERN_ERR "pagealloc: memory corruption\n");
-
-	print_hex_dump(KERN_ERR, "", DUMP_PREFIX_ADDRESS, 16, 1, start,
-			end - start + 1, 1);
-	dump_stack();
-}
-
-static void unpoison_page(struct page *page)
-{
-	void *addr;
-
-	if (!page_poison(page))
-		return;
-
-	addr = kmap_atomic(page);
-	check_poison_mem(addr, PAGE_SIZE);
-	clear_page_poison(page);
-	kunmap_atomic(addr);
-}
-
-static void unpoison_pages(struct page *page, int n)
-{
-	int i;
-
-	for (i = 0; i < n; i++)
-		unpoison_page(page + i);
-}
-
-void __kernel_map_pages(struct page *page, int numpages, int enable)
-{
-	if (!page_poisoning_enabled)
-		return;
-
-	if (enable)
-		unpoison_pages(page, numpages);
-	else
-		poison_pages(page, numpages);
-}