[PATCH Wily SRU] UBUNTU: SAUCE: (noup) crypto: 842 - Add CRC and validation support
tim.gardner at canonical.com
tim.gardner at canonical.com
Tue Oct 20 13:36:44 UTC 2015
From: Haren Myneni <haren at linux.vnet.ibm.com>
BugLink: http://bugs.launchpad.net/bugs/1497878
This patch adds CRC generation and validation support for nx-842.
Add CRC flag so that nx842 coprocessor includes CRC during compression
and validates during decompression.
Also changes in 842 SW compression to append CRC value at the end
of template and checks during decompression.
Signed-off-by: Haren Myneni <haren at us.ibm.com>
Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
(cherry picked from git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git commit ea0b3984c1cc8b28de27a3bec285102b4e366a4c)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
drivers/crypto/nx/nx-842-powernv.c | 4 ++--
drivers/crypto/nx/nx-842-pseries.c | 8 ++++++--
lib/842/842.h | 2 ++
lib/842/842_compress.c | 13 +++++++++++++
lib/842/842_decompress.c | 17 +++++++++++++++++
5 files changed, 40 insertions(+), 4 deletions(-)
diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c
index 684ce51..fbe9682 100644
--- a/drivers/crypto/nx/nx-842-powernv.c
+++ b/drivers/crypto/nx/nx-842-powernv.c
@@ -490,7 +490,7 @@ static int nx842_powernv_compress(const unsigned char *in, unsigned int inlen,
void *wmem)
{
return nx842_powernv_function(in, inlen, out, outlenp,
- wmem, CCW_FC_842_COMP_NOCRC);
+ wmem, CCW_FC_842_COMP_CRC);
}
/**
@@ -518,7 +518,7 @@ static int nx842_powernv_decompress(const unsigned char *in, unsigned int inlen,
void *wmem)
{
return nx842_powernv_function(in, inlen, out, outlenp,
- wmem, CCW_FC_842_DECOMP_NOCRC);
+ wmem, CCW_FC_842_DECOMP_CRC);
}
static int __init nx842_powernv_probe(struct device_node *dn)
diff --git a/drivers/crypto/nx/nx-842-pseries.c b/drivers/crypto/nx/nx-842-pseries.c
index b6a26907..d0ae5d0 100644
--- a/drivers/crypto/nx/nx-842-pseries.c
+++ b/drivers/crypto/nx/nx-842-pseries.c
@@ -231,6 +231,10 @@ static int nx842_validate_result(struct device *dev,
dev_dbg(dev, "%s: Compression output larger than input\n",
__func__);
return -ENOSPC;
+ case 65: /* Calculated CRC doesn't match the passed value */
+ dev_dbg(dev, "%s: CRC mismatch for decompression\n",
+ __func__);
+ return -EINVAL;
case 66: /* Input data contains an illegal template field */
case 67: /* Template indicates data past the end of the input stream */
dev_dbg(dev, "%s: Bad data for decompression (code:%d)\n",
@@ -321,7 +325,7 @@ static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen,
slout.entries = (struct nx842_slentry *)workmem->slout;
/* Init operation */
- op.flags = NX842_OP_COMPRESS;
+ op.flags = NX842_OP_COMPRESS_CRC;
csbcpb = &workmem->csbcpb;
memset(csbcpb, 0, sizeof(*csbcpb));
op.csbcpb = nx842_get_pa(csbcpb);
@@ -454,7 +458,7 @@ static int nx842_pseries_decompress(const unsigned char *in, unsigned int inlen,
slout.entries = (struct nx842_slentry *)workmem->slout;
/* Init operation */
- op.flags = NX842_OP_DECOMPRESS;
+ op.flags = NX842_OP_DECOMPRESS_CRC;
csbcpb = &workmem->csbcpb;
memset(csbcpb, 0, sizeof(*csbcpb));
op.csbcpb = nx842_get_pa(csbcpb);
diff --git a/lib/842/842.h b/lib/842/842.h
index 7c20003..e0a122bc 100644
--- a/lib/842/842.h
+++ b/lib/842/842.h
@@ -76,6 +76,7 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
+#include <linux/crc32.h>
#include <asm/unaligned.h>
#include <linux/sw842.h>
@@ -98,6 +99,7 @@
#define I2_BITS (8)
#define I4_BITS (9)
#define I8_BITS (8)
+#define CRC_BITS (32)
#define REPEAT_BITS_MAX (0x3f)
#define SHORT_DATA_BITS_MAX (0x7)
diff --git a/lib/842/842_compress.c b/lib/842/842_compress.c
index 7ce6894..4051339 100644
--- a/lib/842/842_compress.c
+++ b/lib/842/842_compress.c
@@ -490,6 +490,7 @@ int sw842_compress(const u8 *in, unsigned int ilen,
int ret;
u64 last, next, pad, total;
u8 repeat_count = 0;
+ u32 crc;
BUILD_BUG_ON(sizeof(*p) > SW842_MEM_COMPRESS);
@@ -580,6 +581,18 @@ skip_comp:
if (ret)
return ret;
+ /*
+ * crc(0:31) is appended to target data starting with the next
+ * bit after End of stream template.
+ * nx842 calculates CRC for data in big-endian format. So doing
+ * same here so that sw842 decompression can be used for both
+ * compressed data.
+ */
+ crc = crc32_be(0, in, ilen);
+ ret = add_bits(p, crc, CRC_BITS);
+ if (ret)
+ return ret;
+
if (p->bit) {
p->out++;
p->olen--;
diff --git a/lib/842/842_decompress.c b/lib/842/842_decompress.c
index 5446ff0..8881dad 100644
--- a/lib/842/842_decompress.c
+++ b/lib/842/842_decompress.c
@@ -285,6 +285,7 @@ int sw842_decompress(const u8 *in, unsigned int ilen,
struct sw842_param p;
int ret;
u64 op, rep, tmp, bytes, total;
+ u64 crc;
p.in = (u8 *)in;
p.bit = 0;
@@ -375,6 +376,22 @@ int sw842_decompress(const u8 *in, unsigned int ilen,
}
} while (op != OP_END);
+ /*
+ * crc(0:31) is saved in compressed data starting with the
+ * next bit after End of stream template.
+ */
+ ret = next_bits(&p, &crc, CRC_BITS);
+ if (ret)
+ return ret;
+
+ /*
+ * Validate CRC saved in compressed data.
+ */
+ if (crc != (u64)crc32_be(0, out, total - p.olen)) {
+ pr_debug("CRC mismatch for decompression\n");
+ return -EINVAL;
+ }
+
if (unlikely((total - p.olen) > UINT_MAX))
return -ENOSPC;
--
1.9.1
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