pstore: migrate to crypto acomp interface

The crypto 'compress' interface is deprecated, so before adding new
features, migrate to the acomp interface. Note that we are only using
synchronous implementations of acomp, so we don't have to deal with
asynchronous completion.
Signed-off-by: NArd Biesheuvel <ardb@kernel.org>
Signed-off-by: NKees Cook <keescook@chromium.org>

fs/pstore/platform.c

@@ -28,11 +28,14 @@
 #include <linux/crypto.h>
 #include <linux/string.h>
 #include <linux/timer.h>
+#include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/jiffies.h>
 #include <linux/workqueue.h>
 
+#include <crypto/acompress.h>
+
 #include "internal.h"
 
 /*
@@ -90,7 +93,8 @@ module_param(compress, charp, 0444);
 MODULE_PARM_DESC(compress, "compression to use");
 
 /* Compression parameters */
-static struct crypto_comp *tfm;
+static struct crypto_acomp *tfm;
+static struct acomp_req *creq;
 
 struct pstore_zbackend {
 	int (*zbufsize)(size_t size);
@@ -268,12 +272,21 @@ static const struct pstore_zbackend zbackends[] = {
 static int pstore_compress(const void *in, void *out,
 			   unsigned int inlen, unsigned int outlen)
 {
+	struct scatterlist src, dst;
 	int ret;
 
 	if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS))
 		return -EINVAL;
 
-	ret = crypto_comp_compress(tfm, in, inlen, out, &outlen);
+	sg_init_table(&src, 1);
+	sg_set_buf(&src, in, inlen);
+
+	sg_init_table(&dst, 1);
+	sg_set_buf(&dst, out, outlen);
+
+	acomp_request_set_params(creq, &src, &dst, inlen, outlen);
+
+	ret = crypto_acomp_compress(creq);
 	if (ret) {
 		pr_err("crypto_comp_compress failed, ret = %d!\n", ret);
 		return ret;
@@ -284,7 +297,7 @@ static int pstore_compress(const void *in, void *out,
 
 static void allocate_buf_for_compression(void)
 {
-	struct crypto_comp *ctx;
+	struct crypto_acomp *acomp;
 	int size;
 	char *buf;
 
@@ -296,7 +309,7 @@ static void allocate_buf_for_compression(void)
 	if (!psinfo || tfm)
 		return;
 
-	if (!crypto_has_comp(zbackend->name, 0, 0)) {
+	if (!crypto_has_acomp(zbackend->name, 0, CRYPTO_ALG_ASYNC)) {
 		pr_err("Unknown compression: %s\n", zbackend->name);
 		return;
 	}
@@ -315,16 +328,24 @@ static void allocate_buf_for_compression(void)
 		return;
 	}
 
-	ctx = crypto_alloc_comp(zbackend->name, 0, 0);
-	if (IS_ERR_OR_NULL(ctx)) {
+	acomp = crypto_alloc_acomp(zbackend->name, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR_OR_NULL(acomp)) {
 		kfree(buf);
 		pr_err("crypto_alloc_comp('%s') failed: %ld\n", zbackend->name,
-		       PTR_ERR(ctx));
+		       PTR_ERR(acomp));
+		return;
+	}
+
+	creq = acomp_request_alloc(acomp);
+	if (!creq) {
+		crypto_free_acomp(acomp);
+		kfree(buf);
+		pr_err("acomp_request_alloc('%s') failed\n", zbackend->name);
 		return;
 	}
 
 	/* A non-NULL big_oops_buf indicates compression is available. */
-	tfm = ctx;
+	tfm = acomp;
 	big_oops_buf_sz = size;
 	big_oops_buf = buf;
 
@@ -334,7 +355,8 @@ static void allocate_buf_for_compression(void)
 static void free_buf_for_compression(void)
 {
 	if (IS_ENABLED(CONFIG_PSTORE_COMPRESS) && tfm) {
-		crypto_free_comp(tfm);
+		acomp_request_free(creq);
+		crypto_free_acomp(tfm);
 		tfm = NULL;
 	}
 	kfree(big_oops_buf);
@@ -671,6 +693,8 @@ static void decompress_record(struct pstore_record *record)
 	int ret;
 	int unzipped_len;
 	char *unzipped, *workspace;
+	struct acomp_req *dreq;
+	struct scatterlist src, dst;
 
 	if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS) || !record->compressed)
 		return;
@@ -694,16 +718,30 @@ static void decompress_record(struct pstore_record *record)
 	if (!workspace)
 		return;
 
+	dreq = acomp_request_alloc(tfm);
+	if (!dreq) {
+		kfree(workspace);
+		return;
+	}
+
+	sg_init_table(&src, 1);
+	sg_set_buf(&src, record->buf, record->size);
+
+	sg_init_table(&dst, 1);
+	sg_set_buf(&dst, workspace, unzipped_len);
+
+	acomp_request_set_params(dreq, &src, &dst, record->size, unzipped_len);
+
 	/* After decompression "unzipped_len" is almost certainly smaller. */
-	ret = crypto_comp_decompress(tfm, record->buf, record->size,
-					  workspace, &unzipped_len);
+	ret = crypto_acomp_decompress(dreq);
 	if (ret) {
-		pr_err("crypto_comp_decompress failed, ret = %d!\n", ret);
+		pr_err("crypto_acomp_decompress failed, ret = %d!\n", ret);
 		kfree(workspace);
 		return;
 	}
 
 	/* Append ECC notice to decompressed buffer. */
+	unzipped_len = dreq->dlen;
 	memcpy(workspace + unzipped_len, record->buf + record->size,
 	       record->ecc_notice_size);
 
@@ -711,6 +749,7 @@ static void decompress_record(struct pstore_record *record)
 	unzipped = kmemdup(workspace, unzipped_len + record->ecc_notice_size,
 			   GFP_KERNEL);
 	kfree(workspace);
+	acomp_request_free(dreq);
 	if (!unzipped)
 		return;