Subject: Re: [PATCH 05/25] crypto: omap - switch to skcipher API

From: Tero Kristo <[email-masked]>
Date: Thu, 17 Oct 2019 15:07:30 +0300

On 17/10/2019 14:56, Ard Biesheuvel wrote:
> On Thu, 17 Oct 2019 at 13:25, Tero Kristo <[email-masked]> wrote:
>>
>> On 17/10/2019 13:45, Ard Biesheuvel wrote:
>>> On Thu, 17 Oct 2019 at 12:25, Tero Kristo <[email-masked]> wrote:
>>>>
>>>> On 15/10/2019 20:28, Tony Lindgren wrote:
>>>>> * Ard Biesheuvel <[email-masked]> [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.
>>
>> Thats right, it fixes it. There is another skcipher missing the ivsize
>> within omap-aes.c it seems.
>>
> 
> I take it you are referring to ecb(aes)? That one actually has a
> ivsize of 0, so that one is correct.

Oh yeah, you are right.

> 
>> Do you want to send a patch out for both or shall I send a patch with
>> you as suggested by?
>>
> 
> I'll fold the cbc fix into my series, thanks.

Ok, that works for me.

> 
>> I have some 10 omap crypto related patches on their way.
>>
> 
> Would I be able to test those on a BeagleBone white? In any case,
> please cc me so I can have a look as well.

Yeah, I can CC you there, you can use beaglebone to test them. It has 
the crypto accelerators available.

-Tero

> 
> Thanks,
> Ard.
> 
> 
>>>
>>> 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 ]---
>>>> --
>>
>> --

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