Received-SPF: pass (google.com: best guess record for domain of linux-crypto-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20191014121910.7264-1-ard.biesheuvel@linaro.org>
 <20191014121910.7264-6-ard.biesheuvel@linaro.org> <20191015172843.GB5610@atomide.com>
 <10a69466-7677-ff66-e5e4-9e563c1e457e@ti.com>
In-Reply-To: <10a69466-7677-ff66-e5e4-9e563c1e457e@ti.com>
From:   Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date:   Thu, 17 Oct 2019 12:45:32 +0200
Message-ID: <CAKv+Gu9QQkL7pHjczs6T+iHExpzSmKsP1jS48o464a8rTA9REA@mail.gmail.com>
Subject: Re: [PATCH 05/25] crypto: omap - switch to skcipher API
To:     Tero Kristo <t-kristo@ti.com>
Cc:     Tony Lindgren <tony@atomide.com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@vger.kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Biggers <ebiggers@google.com>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-omap@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Sender: linux-crypto-owner@vger.kernel.org
Precedence: bulk

On Thu, 17 Oct 2019 at 12:25, Tero Kristo <t-kristo@ti.com> wrote:
>
> On 15/10/2019 20:28, Tony Lindgren wrote:
> > * Ard Biesheuvel <ard.biesheuvel@linaro.org> [191014 12:20]:
> >> Commit 7a7ffe65c8c5 ("crypto: skcipher - Add top-level skcipher interface")
> >> dated 20 august 2015 introduced the new skcipher API which is supposed to
> >> replace both blkcipher and ablkcipher. While all consumers of the API have
> >> been converted long ago, some producers of the ablkcipher remain, forcing
> >> us to keep the ablkcipher support routines alive, along with the matching
> >> code to expose [a]blkciphers via the skcipher API.
> >>
> >> So switch this driver to the skcipher API, allowing us to finally drop the
> >> blkcipher code in the near future.
> >
> > Adding Tero to loop as I think he was the last one to update this code.
>
> With this patch, I am seeing the SW fallback fail with the following
> crash. Any ideas why this happens? This on top of 5.4-rc2, I did not
> pick any other crypto patches from the lists, but have couple of local
> fixes to get AES working properly with latest changes to testmgr. Am I
> missing something?
>

Thanks Tero.

It looks like the fallback ends up invoking __crypto_xor() with a
value of NULL for the IV.

This should fix the issue, I think.

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 329fddbe8a39..a1fc03ed01f3 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -715,6 +715,7 @@ static struct skcipher_alg algs_ecb_cbc[] = {

        .min_keysize            = AES_MIN_KEY_SIZE,
        .max_keysize            = AES_MAX_KEY_SIZE,
+       .ivsize                 = AES_BLOCK_SIZE,
        .setkey                 = omap_aes_setkey,
        .encrypt                = omap_aes_cbc_encrypt,
        .decrypt                = omap_aes_cbc_decrypt,


Thanks,
Ard.

> -Tero
>
>
> [   11.458071] 8<--- cut here ---
>
> [   11.461205] Unable to handle kernel NULL pointer dereference at
> virtual addre
> ss 00000000
>
> [   11.469352] pgd = e8df20f8
>
> [   11.472083] [00000000] *pgd=00000000
>
> [   11.475691] Internal error: Oops: 5 [#1] SMP ARM
>
> [   11.480325] Modules linked in: syscopyarea cfbimgblt sysfillrect
> sysimgblt fb
> _sys_fops cfbcopyarea sha512_arm(+) dwc3 ecb udc_core usb_common evdev
> aes_arm a
> es_generic snd_soc_simple_card snd_soc_simple_card_utils
> encoder_tpd12s015 leds_
> gpio led_class aes_arm_bs gpio_fan crypto_simd omapdss connector_hdmi
> omapdss_ba
> se cpufreq_dt cryptd drm omap_wdt watchdog drm_panel_orientation_quirks
> cec omap
> _aes_driver(+) omap_sham(+) phy_omap_usb2 dwc3_omap omap_mailbox
> rtc_omap blueto
> oth ecdh_generic ecc libaes snd_soc_davinci_mcasp snd_soc_ti_edma
> snd_soc_ti_sdm
> a bq27xxx_battery_hdq bq27xxx_battery snd_soc_tlv320aic3x extcon_palmas
> rtc_palm
> as palmas_pwrbutton snd_soc_core snd_pcm_dmaengine omap_rng snd_pcm
> rng_core snd
> _timer omap_hdq snd at24 soundcore tmp102 wire cn rtc_ds1307 hwmon
> omap_des cryp
> to_engine omap_crypto autofs4
>
> [   11.552884] CPU: 0 PID: 979 Comm: cryptomgr_test Not tainted
> 5.4.0-rc2-00014-
> g6f57ec1e433d-dirty #334
>
> [   11.562138] Hardware name: Generic DRA74X (Flattened Device Tree)
>
> [   11.568259] PC is at __crypto_xor+0x20/0xa0
> [   11.572454] LR is at 0x10
>
> [   11.575080] pc : [<c0494a10>]    lr : [<00000010>]    psr: 20010113
>
> [   11.581369] sp : eb5f9a3c  ip : 676e6953  fp : eb5f9cec
>
> [   11.586611] r10: c0e05148  r9 : eb4a4e80  r8 : 00000010
>
> [   11.591853] r7 : 00000003  r6 : eb2e6000  r5 : fffffffc  r4 :
> eb2e6000
> [   11.598403] r3 : 00000010  r2 : 00000000  r1 : eb2e6000  r0 :
> eb2e6000
> [   11.604955] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
> Segment none
> [   11.612115] Control: 10c5387d  Table: abd0806a  DAC: 00000051
>
> [   11.617883] Process cryptomgr_test (pid: 979, stack limit =
> 0x99cee04c)
> [   11.624521] Stack: (0xeb5f9a3c to 0xeb5fa000)
>
> [   11.628891] 9a20:
>
>      00000010
>
> [   11.637101] 9a40: eb2e6000 eb2e6000 00000003 c04a45f8 edc12858
> eb2e6000 edc12
> 858 eb2e6000
>
> [   11.645310] 9a60: eb057020 00000000 00000010 eb057020 00000000
> 00000010 00000
> 000 00000000
>
> [   11.653519] 9a80: 00000000 00000000 00000000 00000000 00000010
> 00000000 00000
> 010 00000010
>
> [   11.661729] 9aa0: 00000000 09865966 eb5f9b00 eb22c400 c0e05148
> 00000003 00000
> 400 00000000
>
> [   11.669938] 9ac0: 00000400 bf18c4c0 00000000 00000000 00000000
> 00000000 00000
> 0b3 00000000
>
> [   11.678147] 9ae0: 00000000 00000001 00000001 00000001 00000000
> 00000000 00000
> 000 09865966
> [   11.686356] 9b00: 00000010 00000000 eb057020 eb057020 eb379800
> eb379940 00000
> 000 00000000
>
> [   11.694566] 9b20: eb4a4e80 00000400 0000084c 00000000 00000002
> 00000001 00000
> 000 00000001
>
> [   11.702774] 9b40: 00000000 c016e38c 00000129 00000000 00000000
> 00000001 00000
> 001 00000001
>
> [   11.710983] 9b60: eb379940 a8a2cc6a 00000002 09865966 c0a04b3c
> efd86300 eb245
> 7c0 efd862c0
>
> [   11.719193] 9b80: eb245900 a8d4a57d 00000002 00000000 eb5f9cf4
> c016ef74 00000
> 000 efd86300
>
> [   11.727402] 9ba0: 00000000 00000001 00000000 00000001 00000000
> c016e38c eb379
> 80c 09865966
>
> [   11.735611] 9bc0: efd86300 efd86300 eb21f240 efd862c0 eb21f380
> 00000000 eb5f9
> d20 eb2e6010
>
> [   11.743819] 9be0: c0e05148 eb2e6000 00000010 c04dfdd4 00000000
> 00000001 c08fb
> 4b8 00000000
>
> [   11.752028] 9c00: 00000020 00000020 eb2e6000 eb057000 c0e05148
> eb0570c0 00000
> 001 c049e5f8
>
> [   11.760237] 9c20: eb057000 00000000 00000000 00000010 00000000
> c0a2eca8 00000
> 010 efd862c0
>
> [   11.768446] 9c40: 2eff5000 eb21f1c0 eb245740 c0e0554c eb5f9c94
> ebe5c040 efd86
> 2c0 ebe5c000
>
> [   11.776656] 9c60: eb4a4e40 ebf65c80 c0a30694 00000000 00000000
> 09865966 c0a2e
> c9c 00000010
> [   11.784865] 9c80: c0a2ec9c eb057000 c0e05148 c0a2eca8 00000000
> 00000010 eb5f9
> cac c049e6fc
>
> [   11.793073] 9ca0: eb5f9cac 00000000 00000000 00000009 00000000
> 00000000 eb5f9
> d28 00000000
>
> [   11.801282] 9cc0: bf18f880 09865966 00000000 09865966 eb22c400
> eb057000 eb22c
> 400 c0a498f8
>
> [   11.809492] 9ce0: 00000000 eb5f9d28 c0a2ec9c c049f850 00000010
> eb5f9d20 00000
> 001 7fffffff
>
> [   11.817702] 9d00: 00000001 00000000 eb07e200 eb5f9e64 c0b7dc78
> eb20ccc0 00000
> 000 00000000
>
> [   11.825910] 9d20: c0b80cf4 00000010 00000000 00000000 eb5f9d30
> eb5f9d30 00000
> 000 00000001
>
> [   11.834119] 9d40: c0e05148 09865966 eb49e004 00000000 00000001
> 00000001 00000
> cc0 eb057168
>
> [   11.842328] 9d60: eb20cd00 eb07e280 00000001 c02963a4 00000000
> 0000000a 00000
> 000 00000000
>
> [   11.850536] 9d80: ffffffff 00000000 00000000 ffffffff 00000000
> eb1f2800 00000
> dc0 00000c30
>
> [   11.858746] 9da0: c0e763bc edc172e0 c0a2d3dc c015d2a4 00000cc0
> 09865966 ec800
> 180 eb5f9e64
>
> [   11.866954] 9dc0: c0b685b2 eb5f9e44 ffffffff c0b685b2 00000002
> eb5f9df4 c0aab
> 698 c08f6464
>
> [   11.875163] 9de0: ffffff0f ffff0a00 14a0619b eb5f9e64 bf18f8a8
> ffffff0f ffff0
> a00 09865966
> [   11.883373] 9e00: c0eac400 c0e05148 c0a498f8 eb07e200 eb07e200
> 00000001 eb22c
> 400 09865966
>
> [   11.891582] 9e20: c0a2d74c c0a2ec9c c0a498f8 c0a2f620 eb07e200
> 00000001 eb22c
> 400 eb057000
>
> [   11.899790] 9e40: c0a2d74c c049fef0 c0a2ec9c eb22c400 eb057000
> eb057180 00000
> 000 00000000
>
> [   11.907998] 9e60: eb057168 eb200030 eb07e280 c049d63c eb057000
> 09865966 eb07e
> 200 eb20ccc0
>
> [   11.916208] 9e80: eb22c400 eb07e200 eb057000 c0a2d74c eb20cd00
> eb07e280 c0a2d
> 3dc c04a1eb8
>
> [   11.924418] 9ea0: eb057000 00000000 c04a1e38 0000001b 00001185
> ffffffff c0e05
> 148 eb07e200
>
> [   11.932626] 9ec0: eb07e280 c049dff0 ecb29100 00000400 efd862c0
> ecb29080 c0e09
> ebc ffffffff
>
> [   11.940835] 9ee0: c08fb4b8 00000102 eb0c6018 efd862c0 ecb29080
> eb245740 ebca5
> 000 00000001
>
> [   11.949043] 9f00: 00000002 eb0c7b64 eb5f9f6c c08fb4b8 00000000
> eb0c7b60 00000
> 001 eb0c7b6c
>
> [   11.957251] 9f20: 00000000 2eff5000 c0a04adc c08fba14 eb245b90
> efd862c0 00000
> 000 00000000
> [   11.965460] 9f40: 00000000 09865966 eb0c7b64 eb245740 eb5f8000
> 09865966 ffffe
> 000 eb07e200
>
> [   11.973668] 9f60: 00000000 eb3f8b80 eb5f8000 eb07e200 c049d144
> eb0c7b64 eb22e
> 29c c049d184
>
> [   11.981877] 9f80: eb22e280 c015c708 00000001 eb3f8b80 c015c5fc
> 00000000 00000
> 000 00000000
>
> [   11.990086] 9fa0: 00000000 00000000 00000000 c01010e8 00000000
> 00000000 00000
> 000 00000000
>
> [   11.998294] 9fc0: 00000000 00000000 00000000 00000000 00000000
> 00000000 00000
> 000 00000000
>
> [   12.006502] 9fe0: 00000000 00000000 00000000 00000000 00000013
> 00000000 00000
> 000 00000000
>
> [   12.014721] [<c0494a10>] (__crypto_xor) from [<c04a45f8>]
> (crypto_cbc_encrypt
> +0xf4/0x13c)
>
> [   12.022945] [<c04a45f8>] (crypto_cbc_encrypt) from [<bf18c4c0>]
> (omap_aes_cry
> pt+0xc8/0x114 [omap_aes_driver])
>
> [   12.032924] [<bf18c4c0>] (omap_aes_crypt [omap_aes_driver]) from
> [<c049f850>]
>   (test_skcipher_vec_cfg+0x1c8/0x7e4)
>
> [   12.043228] [<c049f850>] (test_skcipher_vec_cfg) from [<c049fef0>]
> (test_skci
> pher+0x84/0xf0)
> [   12.051701] [<c049fef0>] (test_skcipher) from [<c04a1eb8>]
> (alg_test_skcipher
> +0x80/0x140)
>
> [   12.059912] [<c04a1eb8>] (alg_test_skcipher) from [<c049dff0>]
> (alg_test.part
> .8+0x8c/0x3a0)
>
> [   12.068297] [<c049dff0>] (alg_test.part.8) from [<c049d184>]
> (cryptomgr_test+
> 0x40/0x48)
>
> [   12.076336] [<c049d184>] (cryptomgr_test) from [<c015c708>]
> (kthread+0x10c/0x
> 148)
>
> [   12.083853] [<c015c708>] (kthread) from [<c01010e8>]
> (ret_from_fork+0x14/0x2c
> )
>
> [   12.091100] Exception stack(0xeb5f9fb0 to 0xeb5f9ff8)
>
> [   12.096169] 9fa0:                                     00000000
> 00000000 00000
> 000 00000000
>
> [   12.104378] 9fc0: 00000000 00000000 00000000 00000000 00000000
> 00000000 00000
> 000 00000000
>
> [   12.112593] 9fe0: 00000000 00000000 00000000 00000000 00000013
> 00000000
> [   12.119240] Code: e2425004 e1a0e003 e1a04000 e5b6c004 (e5b57004)
>
> [   12.125437] ---[ end trace 9b4a71e796035151 ]---
> --
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki