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Revision f2d7b53c0153f2daa8bc8f1ff29b5a1e03a36458 authored by Alexander Potapenko on 02 November 2022, 10:15:00 UTC, committed by Alexander Potapenko on 02 November 2022, 10:55:06 UTC 
x86/traps: avoid KMSAN bugs originating from handle_bug()
 
There is a case in exc_invalid_op handler that is executed outside the
irqentry_enter()/irqentry_exit() region when an UD2 instruction is used
to encode a call to __warn().

In that case the `struct pt_regs` passed to the interrupt handler is
never unpoisoned by KMSAN (this is normally done in irqentry_enter()),
which leads to false positives inside handle_bug().

Use kmsan_unpoison_entry_regs() to explicitly unpoison those registers
before using them.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Signed-off-by: Alexander Potapenko <glider@google.com>
1 parent 4dbc4d5
Raw File
hash_info.c 
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hash Info: Hash algorithms information
 *
 * Copyright (c) 2013 Dmitry Kasatkin <d.kasatkin@samsung.com>
 */

#include <linux/export.h>
#include <crypto/hash_info.h>

const char *const hash_algo_name[HASH_ALGO__LAST] = {
	[HASH_ALGO_MD4]		= "md4",
	[HASH_ALGO_MD5]		= "md5",
	[HASH_ALGO_SHA1]	= "sha1",
	[HASH_ALGO_RIPE_MD_160]	= "rmd160",
	[HASH_ALGO_SHA256]	= "sha256",
	[HASH_ALGO_SHA384]	= "sha384",
	[HASH_ALGO_SHA512]	= "sha512",
	[HASH_ALGO_SHA224]	= "sha224",
	[HASH_ALGO_RIPE_MD_128]	= "rmd128",
	[HASH_ALGO_RIPE_MD_256]	= "rmd256",
	[HASH_ALGO_RIPE_MD_320]	= "rmd320",
	[HASH_ALGO_WP_256]	= "wp256",
	[HASH_ALGO_WP_384]	= "wp384",
	[HASH_ALGO_WP_512]	= "wp512",
	[HASH_ALGO_TGR_128]	= "tgr128",
	[HASH_ALGO_TGR_160]	= "tgr160",
	[HASH_ALGO_TGR_192]	= "tgr192",
	[HASH_ALGO_SM3_256]	= "sm3",
	[HASH_ALGO_STREEBOG_256] = "streebog256",
	[HASH_ALGO_STREEBOG_512] = "streebog512",
};
EXPORT_SYMBOL_GPL(hash_algo_name);

const int hash_digest_size[HASH_ALGO__LAST] = {
	[HASH_ALGO_MD4]		= MD5_DIGEST_SIZE,
	[HASH_ALGO_MD5]		= MD5_DIGEST_SIZE,
	[HASH_ALGO_SHA1]	= SHA1_DIGEST_SIZE,
	[HASH_ALGO_RIPE_MD_160]	= RMD160_DIGEST_SIZE,
	[HASH_ALGO_SHA256]	= SHA256_DIGEST_SIZE,
	[HASH_ALGO_SHA384]	= SHA384_DIGEST_SIZE,
	[HASH_ALGO_SHA512]	= SHA512_DIGEST_SIZE,
	[HASH_ALGO_SHA224]	= SHA224_DIGEST_SIZE,
	[HASH_ALGO_RIPE_MD_128]	= RMD128_DIGEST_SIZE,
	[HASH_ALGO_RIPE_MD_256]	= RMD256_DIGEST_SIZE,
	[HASH_ALGO_RIPE_MD_320]	= RMD320_DIGEST_SIZE,
	[HASH_ALGO_WP_256]	= WP256_DIGEST_SIZE,
	[HASH_ALGO_WP_384]	= WP384_DIGEST_SIZE,
	[HASH_ALGO_WP_512]	= WP512_DIGEST_SIZE,
	[HASH_ALGO_TGR_128]	= TGR128_DIGEST_SIZE,
	[HASH_ALGO_TGR_160]	= TGR160_DIGEST_SIZE,
	[HASH_ALGO_TGR_192]	= TGR192_DIGEST_SIZE,
	[HASH_ALGO_SM3_256]	= SM3256_DIGEST_SIZE,
	[HASH_ALGO_STREEBOG_256] = STREEBOG256_DIGEST_SIZE,
	[HASH_ALGO_STREEBOG_512] = STREEBOG512_DIGEST_SIZE,
};
EXPORT_SYMBOL_GPL(hash_digest_size);
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