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Commit f87fda00 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

bonding: prevent out of bound accesses 



ether_addr_equal_64bits() requires some care about its arguments,
namely that 8 bytes might be read, even if last 2 byte values are not
used.

KASan detected a violation with null_mac_addr and lacpdu_mcast_addr
in bond_3ad.c

Same problem with mac_bcast[] and mac_v6_allmcast[] in bond_alb.c :
Although the 8-byte alignment was there, KASan would detect out
of bound accesses.

Fixes: 815117ad ("bonding: use ether_addr_equal_unaligned for bond addr compare")
Fixes: bb54e589 ("bonding: Verify RX LACPDU has proper dest mac-addr")
Fixes: 885a136c ("bonding: use compare_ether_addr_64bits() in ALB")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Acked-by: default avatarDmitry Vyukov <dvyukov@google.com>
Acked-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: default avatarDing Tianhong <dingtianhong@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3d8c4530

drivers/net/bonding/bond_3ad.c

+7 −4
Original line number Diff line number Diff line
@@ -101,11 +101,14 @@ enum ad_link_speed_type { 
#define MAC_ADDRESS_EQUAL(A, B)	\

	ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)



static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };

static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {

	0, 0, 0, 0, 0, 0

};

static u16 ad_ticks_per_sec;

static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;



static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;

static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =

	MULTICAST_LACPDU_ADDR;



/* ================= main 802.3ad protocol functions ================== */

static int ad_lacpdu_send(struct port *port);
@@ -1739,7 +1742,7 @@ static void ad_clear_agg(struct aggregator *aggregator) 
		aggregator->is_individual = false;

		aggregator->actor_admin_aggregator_key = 0;

		aggregator->actor_oper_aggregator_key = 0;

		aggregator->partner_system = null_mac_addr;

		eth_zero_addr(aggregator->partner_system.mac_addr_value);

		aggregator->partner_system_priority = 0;

		aggregator->partner_oper_aggregator_key = 0;

		aggregator->receive_state = 0;
@@ -1761,7 +1764,7 @@ static void ad_initialize_agg(struct aggregator *aggregator) 
	if (aggregator) {

		ad_clear_agg(aggregator);



		aggregator->aggregator_mac_address = null_mac_addr;

		eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);

		aggregator->aggregator_identifier = 0;

		aggregator->slave = NULL;

	}

drivers/net/bonding/bond_alb.c

+2 −5
Original line number Diff line number Diff line
@@ -42,13 +42,10 @@ 






#ifndef __long_aligned

#define __long_aligned __attribute__((aligned((sizeof(long)))))

#endif

static const u8 mac_bcast[ETH_ALEN] __long_aligned = {

static const u8 mac_bcast[ETH_ALEN + 2] __long_aligned = {

	0xff, 0xff, 0xff, 0xff, 0xff, 0xff

};

static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {

static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {

	0x33, 0x33, 0x00, 0x00, 0x00, 0x01

};

static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;

include/net/bonding.h

+6 −1
Original line number Diff line number Diff line
@@ -34,6 +34,9 @@ 


#define BOND_DEFAULT_MIIMON	100



#ifndef __long_aligned

#define __long_aligned __attribute__((aligned((sizeof(long)))))

#endif

/*

 * Less bad way to call ioctl from within the kernel; this needs to be

 * done some other way to get the call out of interrupt context.
@@ -138,7 +141,9 @@ struct bond_params { 
	struct reciprocal_value reciprocal_packets_per_slave;

	u16 ad_actor_sys_prio;

	u16 ad_user_port_key;

	u8 ad_actor_system[ETH_ALEN];



	/* 2 bytes of padding : see ether_addr_equal_64bits() */

	u8 ad_actor_system[ETH_ALEN + 2];

};



struct bond_parm_tbl {