crypto: vmx - Fix sleep-in-atomic bugs

This patch fixes sleep-in-atomic bugs in AES-CBC and AES-XTS VMX
implementations. The problem is that the blkcipher_* functions should
not be called in atomic context.

The bugs can be reproduced via the AF_ALG interface by trying to
encrypt/decrypt sufficiently large buffers (at least 64 KiB) using the
VMX implementations of 'cbc(aes)' or 'xts(aes)'. Such operations then
trigger BUG in crypto_yield():

[  891.863680] BUG: sleeping function called from invalid context at include/crypto/algapi.h:424
[  891.864622] in_atomic(): 1, irqs_disabled(): 0, pid: 12347, name: kcapi-enc
[  891.864739] 1 lock held by kcapi-enc/12347:
[  891.864811]  #0: 00000000f5d42c46 (sk_lock-AF_ALG){+.+.}, at: skcipher_recvmsg+0x50/0x530
[  891.865076] CPU: 5 PID: 12347 Comm: kcapi-enc Not tainted 4.19.0-0.rc0.git3.1.fc30.ppc64le #1
[  891.865251] Call Trace:
[  891.865340] [c0000003387578c0] [c000000000d67ea4] dump_stack+0xe8/0x164 (unreliable)
[  891.865511] [c000000338757910] [c000000000172a58] ___might_sleep+0x2f8/0x310
[  891.865679] [c000000338757990] [c0000000006bff74] blkcipher_walk_done+0x374/0x4a0
[  891.865825] [c0000003387579e0] [d000000007e73e70] p8_aes_cbc_encrypt+0x1c8/0x260 [vmx_crypto]
[  891.865993] [c000000338757ad0] [c0000000006c0ee0] skcipher_encrypt_blkcipher+0x60/0x80
[  891.866128] [c000000338757b10] [c0000000006ec504] skcipher_recvmsg+0x424/0x530
[  891.866283] [c000000338757bd0] [c000000000b00654] sock_recvmsg+0x74/0xa0
[  891.866403] [c000000338757c10] [c000000000b00f64] ___sys_recvmsg+0xf4/0x2f0
[  891.866515] [c000000338757d90] [c000000000b02bb8] __sys_recvmsg+0x68/0xe0
[  891.866631] [c000000338757e30] [c00000000000bbe4] system_call+0x5c/0x70

Fixes: 8c755ace357c ("crypto: vmx - Adding CBC routines for VMX module")
Fixes: c07f5d3da643 ("crypto: vmx - Adding support for XTS")
Cc: stable@vger.kernel.org
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 28 insertions, 23 deletions

diff --git a/drivers/crypto/vmx/aes_cbc.c b/drivers/crypto/vmx/aes_cbc.c
index 5285ece4f33a..b71895871be3 100644
--- a/drivers/crypto/vmx/aes_cbc.c
+++ b/drivers/crypto/vmx/aes_cbc.c
@@ -107,24 +107,23 @@ static int p8_aes_cbc_encrypt(struct blkcipher_desc *desc,
                 ret = crypto_skcipher_encrypt(req);
                 skcipher_request_zero(req);
         } else {
-                preempt_disable();
-                pagefault_disable();
-                enable_kernel_vsx();
-
                 blkcipher_walk_init(&walk, dst, src, nbytes);
                 ret = blkcipher_walk_virt(desc, &walk);
                 while ((nbytes = walk.nbytes)) {
+                        preempt_disable();
+                        pagefault_disable();
+                        enable_kernel_vsx();
                         aes_p8_cbc_encrypt(walk.src.virt.addr,
                                            walk.dst.virt.addr,
                                            nbytes & AES_BLOCK_MASK,
                                            &ctx->enc_key, walk.iv, 1);
+                        disable_kernel_vsx();
+                        pagefault_enable();
+                        preempt_enable();
+
                         nbytes &= AES_BLOCK_SIZE - 1;
                         ret = blkcipher_walk_done(desc, &walk, nbytes);
                 }
-
-                disable_kernel_vsx();
-                pagefault_enable();
-                preempt_enable();
         }
 
         return ret;
@@ -147,24 +146,23 @@ static int p8_aes_cbc_decrypt(struct blkcipher_desc *desc,
                 ret = crypto_skcipher_decrypt(req);
                 skcipher_request_zero(req);
         } else {
-                preempt_disable();
-                pagefault_disable();
-                enable_kernel_vsx();
-
                 blkcipher_walk_init(&walk, dst, src, nbytes);
                 ret = blkcipher_walk_virt(desc, &walk);
                 while ((nbytes = walk.nbytes)) {
+                        preempt_disable();
+                        pagefault_disable();
+                        enable_kernel_vsx();
                         aes_p8_cbc_encrypt(walk.src.virt.addr,
                                            walk.dst.virt.addr,
                                            nbytes & AES_BLOCK_MASK,
                                            &ctx->dec_key, walk.iv, 0);
+                        disable_kernel_vsx();
+                        pagefault_enable();
+                        preempt_enable();
+
                         nbytes &= AES_BLOCK_SIZE - 1;
                         ret = blkcipher_walk_done(desc, &walk, nbytes);
                 }
-
-                disable_kernel_vsx();
-                pagefault_enable();
-                preempt_enable();
         }
 
         return ret;
diff --git a/drivers/crypto/vmx/aes_xts.c b/drivers/crypto/vmx/aes_xts.c
index 8bd9aff0f55f..e9954a7d4694 100644
--- a/drivers/crypto/vmx/aes_xts.c
+++ b/drivers/crypto/vmx/aes_xts.c
@@ -116,32 +116,39 @@ static int p8_aes_xts_crypt(struct blkcipher_desc *desc,
                 ret = enc? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req);
                 skcipher_request_zero(req);
         } else {
+                blkcipher_walk_init(&walk, dst, src, nbytes);
+
+                ret = blkcipher_walk_virt(desc, &walk);
+
                 preempt_disable();
                 pagefault_disable();
                 enable_kernel_vsx();
 
-                blkcipher_walk_init(&walk, dst, src, nbytes);
-
-                ret = blkcipher_walk_virt(desc, &walk);
                 iv = walk.iv;
                 memset(tweak, 0, AES_BLOCK_SIZE);
                 aes_p8_encrypt(iv, tweak, &ctx->tweak_key);
 
+                disable_kernel_vsx();
+                pagefault_enable();
+                preempt_enable();
+
                 while ((nbytes = walk.nbytes)) {
+                        preempt_disable();
+                        pagefault_disable();
+                        enable_kernel_vsx();
                         if (enc)
                                 aes_p8_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
                                                 nbytes & AES_BLOCK_MASK, &ctx->enc_key, NULL, tweak);
                         else
                                 aes_p8_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
                                                 nbytes & AES_BLOCK_MASK, &ctx->dec_key, NULL, tweak);
+                        disable_kernel_vsx();
+                        pagefault_enable();
+                        preempt_enable();
 
                         nbytes &= AES_BLOCK_SIZE - 1;
                         ret = blkcipher_walk_done(desc, &walk, nbytes);
                 }
-
-                disable_kernel_vsx();
-                pagefault_enable();
-                preempt_enable();
         }
         return ret;
 }