From: Eric Biggers <ebiggers@xxxxxxxxxx>
Like the skcipher_walk and blkcipher_walk cases:
scatterwalk_done() is only meant to be called after a nonzero number of
bytes have been processed, since scatterwalk_pagedone() will flush the
dcache of the *previous* page. But in the error case of
ablkcipher_walk_done(), e.g. if the input wasn't an integer number of
blocks, scatterwalk_done() was actually called after advancing 0 bytes.
This caused a crash ("BUG: unable to handle kernel paging request")
during '!PageSlab(page)' on architectures like arm and arm64 that define
ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE, provided that the input was
page-aligned as in that case walk->offset == 0.
Fix it by reorganizing ablkcipher_walk_done() to skip the
scatterwalk_advance() and scatterwalk_done() if an error has occurred.
Reported-by: Liu Chao <liuchao741@xxxxxxxxxx>
Fixes: bf06099db18a ("crypto: skcipher - Add ablkcipher_walk interfaces")
Cc: <stable@xxxxxxxxxxxxxxx> # v2.6.35+
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
crypto/ablkcipher.c | 57 +++++++++++++++++++++------------------------
1 file changed, 26 insertions(+), 31 deletions(-)
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 1edb5000d783..8882e90e868e 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -71,11 +71,9 @@ static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
return max(start, end_page);
}
-static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
- unsigned int bsize)
+static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk,
+ unsigned int n)
{
- unsigned int n = bsize;
-
for (;;) {
unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
@@ -87,17 +85,13 @@ static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
n -= len_this_page;
scatterwalk_start(&walk->out, sg_next(walk->out.sg));
}
-
- return bsize;
}
-static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
- unsigned int n)
+static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
+ unsigned int n)
{
scatterwalk_advance(&walk->in, n);
scatterwalk_advance(&walk->out, n);
-
- return n;
}
static int ablkcipher_walk_next(struct ablkcipher_request *req,
@@ -107,39 +101,40 @@ int ablkcipher_walk_done(struct ablkcipher_request *req,
struct ablkcipher_walk *walk, int err)
{
struct crypto_tfm *tfm = req->base.tfm;
- unsigned int nbytes = 0;
+ unsigned int n; /* bytes processed */
+ bool more;
- if (likely(err >= 0)) {
- unsigned int n = walk->nbytes - err;
+ if (unlikely(err < 0))
+ goto finish;
- if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
- n = ablkcipher_done_fast(walk, n);
- else if (WARN_ON(err)) {
- err = -EINVAL;
- goto err;
- } else
- n = ablkcipher_done_slow(walk, n);
+ n = walk->nbytes - err;
+ walk->total -= n;
+ more = (walk->total != 0);
- nbytes = walk->total - n;
- err = 0;
+ if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
+ ablkcipher_done_fast(walk, n);
+ } else {
+ if (WARN_ON(err)) {
+ /* unexpected case; didn't process all bytes */
+ err = -EINVAL;
+ goto finish;
+ }
+ ablkcipher_done_slow(walk, n);
}
- scatterwalk_done(&walk->in, 0, nbytes);
- scatterwalk_done(&walk->out, 1, nbytes);
-
-err:
- walk->total = nbytes;
- walk->nbytes = nbytes;
+ scatterwalk_done(&walk->in, 0, more);
+ scatterwalk_done(&walk->out, 1, more);
- if (nbytes) {
+ if (more) {
crypto_yield(req->base.flags);
return ablkcipher_walk_next(req, walk);
}
-
+ err = 0;
+finish:
+ walk->nbytes = 0;
if (walk->iv != req->info)
memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
kfree(walk->iv_buffer);
-
return err;
}
EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
--
2.18.0.233.g985f88cf7e-goog
