kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/powerpc/crypto/crc-vpmsum_test.c
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@@ -1,10 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * CRC vpmsum tester
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  * Copyright 2017 Daniel Axtens, IBM Corporation.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/crc-t10dif.h>
..
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@@ -12,6 +9,7 @@
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 #include <crypto/internal/hash.h>
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 #include <linux/init.h>
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 #include <linux/module.h>
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+#include <linux/random.h>
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 #include <linux/string.h>
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 #include <linux/kernel.h>
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 #include <linux/cpufeature.h>
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@@ -25,10 +23,11 @@
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 static int __init crc_test_init(void)
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 {
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 	u16 crc16 = 0, verify16 = 0;
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-	u32 crc32 = 0, verify32 = 0;
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 	__le32 verify32le = 0;
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 	unsigned char *data;
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+	u32 verify32 = 0;
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 	unsigned long i;
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+	__le32 crc32;
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 	int ret;
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 	struct crypto_shash *crct10dif_tfm;
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@@ -78,16 +77,12 @@
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 		pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
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 		for (i=0; i<iterations; i++) {
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-			size_t len, offset;
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+			size_t offset = prandom_u32_max(16);
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+			size_t len = prandom_u32_max(MAX_CRC_LENGTH);
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-			get_random_bytes(data, MAX_CRC_LENGTH);
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-			get_random_bytes(&len, sizeof(len));
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-			get_random_bytes(&offset, sizeof(offset));
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-
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-			len %= MAX_CRC_LENGTH;
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-			offset &= 15;
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 			if (len <= offset)
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 				continue;
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+			prandom_bytes(data, len);
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 			len -= offset;
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 			crypto_shash_update(crct10dif_shash, data+offset, len);
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@@ -105,11 +100,12 @@
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 			crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
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 			verify32 = le32_to_cpu(verify32le);
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 		        verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
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-			if (crc32 != (u32)verify32le) {
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+			if (crc32 != verify32le) {
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 				pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
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 				       crc32, verify32, len);
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 				break;
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 			}
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+		cond_resched();
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 		}
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 		pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
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 	} while (0);