linux-kernel - [PATCH v2] crypto: talitos - fix ablkcipher for CONFIG_VMAP

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Message-Id: <7f27d91e7e78d8aac28e8b6c600fd874b7d5be9f.1544686398.git.christophe.leroy@c-s.fr>
Date:   Thu, 13 Dec 2018 07:34:37 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2] crypto: talitos - fix ablkcipher for CONFIG_VMAP_STACK

[    2.364486] WARNING: CPU: 0 PID: 60 at ./arch/powerpc/include/asm/io.h:837 dma_nommu_map_page+0x44/0xd4
[    2.373579] CPU: 0 PID: 60 Comm: cryptomgr_test Tainted: G        W         4.20.0-rc5-00560-g6bfb52e23a00-dirty #531
[    2.384740] NIP:  c000c540 LR: c000c584 CTR: 00000000
[    2.389743] REGS: c95abab0 TRAP: 0700   Tainted: G        W          (4.20.0-rc5-00560-g6bfb52e23a00-dirty)
[    2.400042] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 24042204  XER: 00000000
[    2.406669]
[    2.406669] GPR00: c02f2244 c95abb60 c6262990 c95abd80 0000256a 00000001 00000001 00000001
[    2.406669] GPR08: 00000000 00002000 00000010 00000010 24042202 00000000 00000100 c95abd88
[    2.406669] GPR16: 00000000 c05569d4 00000001 00000010 c95abc88 c0615664 00000004 00000000
[    2.406669] GPR24: 00000010 c95abc88 c95abc88 00000000 c61ae210 c7ff6d40 c61ae210 00003d68
[    2.441559] NIP [c000c540] dma_nommu_map_page+0x44/0xd4
[    2.446720] LR [c000c584] dma_nommu_map_page+0x88/0xd4
[    2.451762] Call Trace:
[    2.454195] [c95abb60] [82000808] 0x82000808 (unreliable)
[    2.459572] [c95abb80] [c02f2244] talitos_edesc_alloc+0xbc/0x3c8
[    2.465493] [c95abbb0] [c02f2600] ablkcipher_edesc_alloc+0x4c/0x5c
[    2.471606] [c95abbd0] [c02f4ed0] ablkcipher_encrypt+0x20/0x64
[    2.477389] [c95abbe0] [c02023b0] __test_skcipher+0x4bc/0xa08
[    2.483049] [c95abe00] [c0204b60] test_skcipher+0x2c/0xcc
[    2.488385] [c95abe20] [c0204c48] alg_test_skcipher+0x48/0xbc
[    2.494064] [c95abe40] [c0205cec] alg_test+0x164/0x2e8
[    2.499142] [c95abf00] [c0200dec] cryptomgr_test+0x48/0x50
[    2.504558] [c95abf10] [c0039ff4] kthread+0xe4/0x110
[    2.509471] [c95abf40] [c000e1d0] ret_from_kernel_thread+0x14/0x1c
[    2.515532] Instruction dump:
[    2.518468] 7c7e1b78 7c9d2378 7cbf2b78 41820054 3d20c076 8089c200 3d20c076 7c84e850
[    2.526127] 8129c204 7c842e70 7f844840 419c0008 <0fe00000> 2f9e0000 54847022 7c84fa14
[    2.533960] ---[ end trace bf78d94af73fe3b8 ]---
[    2.539123] talitos ff020000.crypto: master data transfer error
[    2.544775] talitos ff020000.crypto: TEA error: ISR 0x20000000_00000040
[    2.551625] alg: skcipher: encryption failed on test 1 for ecb-aes-talitos: ret=22

IV cannot be on stack when CONFIG_VMAP_STACK is selected because the stack
cannot be DMA mapped anymore.

This patch copies the IV from areq->info into the request context.

Fixes: 4de9d0b547b9 ("crypto: talitos - Add ablkcipher algorithms")
Cc: stable@...r.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 v2: Using per-request context.

 drivers/crypto/talitos.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 6988012deca4..df289758755c 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1664,12 +1664,16 @@ static int common_nonsnoop(struct talitos_edesc *edesc,
 static struct talitos_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request *
 						    areq, bool encrypt)
 {
+	void *req_ctx = ablkcipher_request_ctx(areq);
 	struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
 	struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
 	unsigned int ivsize = crypto_ablkcipher_ivsize(cipher);
 
+	if (ivsize)
+		memcpy(req_ctx, areq->info, ivsize);
+
 	return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst,
-				   areq->info, 0, areq->nbytes, 0, ivsize, 0,
+				   req_ctx, 0, areq->nbytes, 0, ivsize, 0,
 				   areq->base.flags, encrypt);
 }
 
@@ -3066,6 +3070,13 @@ static int talitos_cra_init_ahash(struct crypto_tfm *tfm)
 	return 0;
 }
 
+static int talitos_cra_init_ablkcipher(struct crypto_tfm *tfm)
+{
+	tfm->crt_ablkcipher.reqsize = TALITOS_MAX_IV_LENGTH;
+
+	return talitos_cra_init(tfm);
+}
+
 static void talitos_cra_exit(struct crypto_tfm *tfm)
 {
 	struct talitos_ctx *ctx = crypto_tfm_ctx(tfm);
@@ -3149,7 +3160,7 @@ static struct talitos_crypto_alg *talitos_alg_alloc(struct device *dev,
 	switch (t_alg->algt.type) {
 	case CRYPTO_ALG_TYPE_ABLKCIPHER:
 		alg = &t_alg->algt.alg.crypto;
-		alg->cra_init = talitos_cra_init;
+		alg->cra_init = talitos_cra_init_ablkcipher;
 		alg->cra_exit = talitos_cra_exit;
 		alg->cra_type = &crypto_ablkcipher_type;
 		alg->cra_ablkcipher.setkey = ablkcipher_setkey;
-- 
2.13.3