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Miller" , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Jonathan Corbet , Ovidiu Panait , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Cc: Arnaud Ferraris , Andrey Skvortsov Subject: [PATCH] crypto: sun8i-ce - Fix use after free in unprepare. Date: Tue, 27 Feb 2024 00:53:57 +0300 Message-ID: <20240226215358.555234-1-andrej.skvortzov@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" sun8i_ce_cipher_unprepare should be called before crypto_finalize_skcipher_request, because client callbacks may immediately free memory, that isn't needed anymore. But it will be used by unprepare after free. Before removing prepare/unprepare callbacks it was handled by crypto engine in crypto_finalize_request. Usually that results in a pointer dereference problem during a in crypto selftest. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030 Mem abort info: ESR =3D 0x0000000096000004 EC =3D 0x25: DABT (current EL), IL =3D 32 bits SET =3D 0, FnV =3D 0 EA =3D 0, S1PTW =3D 0 FSC =3D 0x04: level 0 translation fault Data abort info: ISV =3D 0, ISS =3D 0x00000004, ISS2 =3D 0x00000000 CM =3D 0, WnR =3D 0, TnD =3D 0, TagAccess =3D 0 GCS =3D 0, Overlay =3D 0, DirtyBit =3D 0, Xs =3D 0 user pgtable: 4k pages, 48-bit VAs, pgdp=3D000000004716d000 [0000000000000030] pgd=3D0000000000000000, p4d=3D0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP This problem is detected by KASAN as well. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D BUG: KASAN: slab-use-after-free in sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun= 8i_ce] Read of size 8 at addr ffff00000dcdc040 by task 1c15000.crypto-/373 Hardware name: Pine64 PinePhone (1.2) (DT) Call trace: dump_backtrace+0x9c/0x128 show_stack+0x20/0x38 dump_stack_lvl+0x48/0x60 print_report+0xf8/0x5d8 kasan_report+0x90/0xd0 __asan_load8+0x9c/0xc0 sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce] crypto_pump_work+0x354/0x620 [crypto_engine] kthread_worker_fn+0x244/0x498 kthread+0x168/0x178 ret_from_fork+0x10/0x20 Allocated by task 379: kasan_save_stack+0x3c/0x68 kasan_set_track+0x2c/0x40 kasan_save_alloc_info+0x24/0x38 __kasan_kmalloc+0xd4/0xd8 __kmalloc+0x74/0x1d0 alg_test_skcipher+0x90/0x1f0 alg_test+0x24c/0x830 cryptomgr_test+0x38/0x60 kthread+0x168/0x178 ret_from_fork+0x10/0x20 Freed by task 379: kasan_save_stack+0x3c/0x68 kasan_set_track+0x2c/0x40 kasan_save_free_info+0x38/0x60 __kasan_slab_free+0x100/0x170 slab_free_freelist_hook+0xd4/0x1e8 __kmem_cache_free+0x15c/0x290 kfree+0x74/0x100 kfree_sensitive+0x80/0xb0 alg_test_skcipher+0x12c/0x1f0 alg_test+0x24c/0x830 cryptomgr_test+0x38/0x60 kthread+0x168/0x178 ret_from_fork+0x10/0x20 The buggy address belongs to the object at ffff00000dcdc000 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 64 bytes inside of freed 256-byte region [ffff00000dcdc000, ffff00000dcdc100) Signed-off-by: Andrey Skvortsov Fixes: 4136212ab18e ("crypto: sun8i-ce - Remove prepare/unprepare request") --- .../allwinner/sun8i-ce/sun8i-ce-cipher.c | 34 +++++++++---------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c b/drivers/= crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c index 1262a7773ef3..de50c00ba218 100644 --- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c +++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c @@ -299,22 +299,6 @@ static int sun8i_ce_cipher_prepare(struct crypto_engin= e *engine, void *async_req return err; } =20 -static void sun8i_ce_cipher_run(struct crypto_engine *engine, void *areq) -{ - struct skcipher_request *breq =3D container_of(areq, struct skcipher_requ= est, base); - struct crypto_skcipher *tfm =3D crypto_skcipher_reqtfm(breq); - struct sun8i_cipher_tfm_ctx *op =3D crypto_skcipher_ctx(tfm); - struct sun8i_ce_dev *ce =3D op->ce; - struct sun8i_cipher_req_ctx *rctx =3D skcipher_request_ctx(breq); - int flow, err; - - flow =3D rctx->flow; - err =3D sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm)); - local_bh_disable(); - crypto_finalize_skcipher_request(engine, breq, err); - local_bh_enable(); -} - static void sun8i_ce_cipher_unprepare(struct crypto_engine *engine, void *async_req) { @@ -360,6 +344,23 @@ static void sun8i_ce_cipher_unprepare(struct crypto_en= gine *engine, dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE); } =20 +static void sun8i_ce_cipher_run(struct crypto_engine *engine, void *areq) +{ + struct skcipher_request *breq =3D container_of(areq, struct skcipher_requ= est, base); + struct crypto_skcipher *tfm =3D crypto_skcipher_reqtfm(breq); + struct sun8i_cipher_tfm_ctx *op =3D crypto_skcipher_ctx(tfm); + struct sun8i_ce_dev *ce =3D op->ce; + struct sun8i_cipher_req_ctx *rctx =3D skcipher_request_ctx(breq); + int flow, err; + + flow =3D rctx->flow; + err =3D sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm)); + sun8i_ce_cipher_unprepare(engine, areq); + local_bh_disable(); + crypto_finalize_skcipher_request(engine, breq, err); + local_bh_enable(); +} + int sun8i_ce_cipher_do_one(struct crypto_engine *engine, void *areq) { int err =3D sun8i_ce_cipher_prepare(engine, areq); @@ -368,7 +369,6 @@ int sun8i_ce_cipher_do_one(struct crypto_engine *engine= , void *areq) return err; =20 sun8i_ce_cipher_run(engine, areq); - sun8i_ce_cipher_unprepare(engine, areq); return 0; } =20 --=20 2.43.0