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Revision 16e604a437c89751dc626c9e90cf88ba93c5be64 authored by Alexandru Elisei on 07 August 2019, 09:53:20 UTC, committed by Marc Zyngier on 09 August 2019, 07:07:26 UTC 
KVM: arm/arm64: vgic: Reevaluate level sensitive interrupts on enable
 
A HW mapped level sensitive interrupt asserted by a device will not be put
into the ap_list if it is disabled at the VGIC level. When it is enabled
again, it will be inserted into the ap_list and written to a list register
on guest entry regardless of the state of the device.

We could argue that this can also happen on real hardware, when the command
to enable the interrupt reached the GIC before the device had the chance to
de-assert the interrupt signal; however, we emulate the distributor and
redistributors in software and we can do better than that.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
1 parent c69509c
Raw File
aes_cmac.c 
// SPDX-License-Identifier: GPL-2.0-only
/*
 * AES-128-CMAC with TLen 16 for IEEE 802.11w BIP
 * Copyright 2008, Jouni Malinen <j@w1.fi>
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/export.h>
#include <linux/err.h>
#include <crypto/aes.h>

#include <net/mac80211.h>
#include "key.h"
#include "aes_cmac.h"

#define CMAC_TLEN 8 /* CMAC TLen = 64 bits (8 octets) */
#define CMAC_TLEN_256 16 /* CMAC TLen = 128 bits (16 octets) */
#define AAD_LEN 20

static const u8 zero[CMAC_TLEN_256];

void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
			const u8 *data, size_t data_len, u8 *mic)
{
	SHASH_DESC_ON_STACK(desc, tfm);
	u8 out[AES_BLOCK_SIZE];

	desc->tfm = tfm;

	crypto_shash_init(desc);
	crypto_shash_update(desc, aad, AAD_LEN);
	crypto_shash_update(desc, data, data_len - CMAC_TLEN);
	crypto_shash_finup(desc, zero, CMAC_TLEN, out);

	memcpy(mic, out, CMAC_TLEN);
}

void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad,
			    const u8 *data, size_t data_len, u8 *mic)
{
	SHASH_DESC_ON_STACK(desc, tfm);

	desc->tfm = tfm;

	crypto_shash_init(desc);
	crypto_shash_update(desc, aad, AAD_LEN);
	crypto_shash_update(desc, data, data_len - CMAC_TLEN_256);
	crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic);
}

struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
						  size_t key_len)
{
	struct crypto_shash *tfm;

	tfm = crypto_alloc_shash("cmac(aes)", 0, 0);
	if (!IS_ERR(tfm))
		crypto_shash_setkey(tfm, key, key_len);

	return tfm;
}

void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
{
	crypto_free_shash(tfm);
}
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