From: Minchan Kim <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit d72e9a7a93e4f8e9e52491921d99e0c8aa89eb4e upstream.
The copy_page is optimized memcpy for page-alinged address. If it is
used with non-page aligned address, it can corrupt memory which means
system corruption. With zram, it can happen with
1. 64K architecture
2. partial IO
3. slub debug
Partial IO need to allocate a page and zram allocates it via kmalloc.
With slub debug, kmalloc(PAGE_SIZE) doesn't return page-size aligned
address. And finally, copy_page(mem, cmem) corrupts memory.
So, this patch changes it to memcpy.
Actuaully, we don't need to change zram_bvec_write part because zsmalloc
returns page-aligned address in case of PAGE_SIZE class but it's not
good to rely on the internal of zsmalloc.
Note:
When this patch is merged to stable, clear_page should be fixed, too.
Unfortunately, recent zram removes it by "same page merge" feature so
it's hard to backport this patch to -stable tree.
I will handle it when I receive the mail from stable tree maintainer to
merge this patch to backport.
Fixes: 42e99bd ("zram: optimize memory operations with
clear_page()/copy_page()")
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Minchan Kim <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
drivers/staging/zram/zram_drv.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 162e01a27d40..f893a902a534 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -321,13 +321,13 @@ static int zram_decompress_page(struct zram *zram, char
*mem, u32 index)
unsigned long handle = meta->table[index].handle;
if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) {
- clear_page(mem);
+ memset(mem, 0, PAGE_SIZE);
return 0;
}
cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_RO);
if (meta->table[index].size == PAGE_SIZE)
- copy_page(mem, cmem);
+ memcpy(mem, cmem, PAGE_SIZE);
else
ret = lzo1x_decompress_safe(cmem, meta->table[index].size,
mem, &clen);
@@ -482,7 +482,7 @@ static int zram_bvec_write(struct zram *zram, struct
bio_vec *bvec, u32 index,
if ((clen == PAGE_SIZE) && !is_partial_io(bvec)) {
src = kmap_atomic(page);
- copy_page(cmem, src);
+ memcpy(cmem, src, PAGE_SIZE);
kunmap_atomic(src);
} else {
memcpy(cmem, src, clen);
--
2.12.2
