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linux_dsm_epyc7002/include/linux/can/dev.h
Oliver Hartkopp e7153bf70c can: can_dropped_invalid_skb(): ensure an initialized headroom in outgoing CAN sk_buffs 
KMSAN sysbot detected a read access to an untinitialized value in the
headroom of an outgoing CAN related sk_buff. When using CAN sockets this
area is filled appropriately - but when using a packet socket this
initialization is missing.

The problematic read access occurs in the CAN receive path which can
only be triggered when the sk_buff is sent through a (virtual) CAN
interface. So we check in the sending path whether we need to perform
the missing initializations.

Fixes: d3b58c47d3 ("can: replace timestamp as unique skb attribute")
Reported-by: syzbot+b02ff0707a97e4e79ebb@syzkaller.appspotmail.com
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: linux-stable <stable@vger.kernel.org> # >= v4.1
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-01-02 15:34:27 +01:00

224 lines
6.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/can/dev.h
*
* Definitions for the CAN network device driver interface
*
* Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com>
* Varma Electronics Oy
*
* Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com>
*
*/
#ifndef _CAN_DEV_H
#define _CAN_DEV_H
#include <linux/can.h>
#include <linux/can/error.h>
#include <linux/can/led.h>
#include <linux/can/netlink.h>
#include <linux/can/skb.h>
#include <linux/netdevice.h>
/*
* CAN mode
*/
enum can_mode {
CAN_MODE_STOP = 0,
CAN_MODE_START,
CAN_MODE_SLEEP
};
/*
* CAN common private data
*/
struct can_priv {
struct net_device *dev;
struct can_device_stats can_stats;
struct can_bittiming bittiming, data_bittiming;
const struct can_bittiming_const *bittiming_const,
*data_bittiming_const;
const u16 *termination_const;
unsigned int termination_const_cnt;
u16 termination;
const u32 *bitrate_const;
unsigned int bitrate_const_cnt;
const u32 *data_bitrate_const;
unsigned int data_bitrate_const_cnt;
u32 bitrate_max;
struct can_clock clock;
enum can_state state;
/* CAN controller features - see include/uapi/linux/can/netlink.h */
u32 ctrlmode; /* current options setting */
u32 ctrlmode_supported; /* options that can be modified by netlink */
u32 ctrlmode_static; /* static enabled options for driver/hardware */
int restart_ms;
struct delayed_work restart_work;
int (*do_set_bittiming)(struct net_device *dev);
int (*do_set_data_bittiming)(struct net_device *dev);
int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
int (*do_set_termination)(struct net_device *dev, u16 term);
int (*do_get_state)(const struct net_device *dev,
enum can_state *state);
int (*do_get_berr_counter)(const struct net_device *dev,
struct can_berr_counter *bec);
unsigned int echo_skb_max;
struct sk_buff **echo_skb;
#ifdef CONFIG_CAN_LEDS
struct led_trigger *tx_led_trig;
char tx_led_trig_name[CAN_LED_NAME_SZ];
struct led_trigger *rx_led_trig;
char rx_led_trig_name[CAN_LED_NAME_SZ];
struct led_trigger *rxtx_led_trig;
char rxtx_led_trig_name[CAN_LED_NAME_SZ];
#endif
};
/*
* get_can_dlc(value) - helper macro to cast a given data length code (dlc)
* to __u8 and ensure the dlc value to be max. 8 bytes.
*
* To be used in the CAN netdriver receive path to ensure conformance with
* ISO 11898-1 Chapter 8.4.2.3 (DLC field)
*/
#define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC))
#define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC))
/* Check for outgoing skbs that have not been created by the CAN subsystem */
static inline bool can_skb_headroom_valid(struct net_device *dev,
struct sk_buff *skb)
{
/* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */
if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv)))
return false;
/* af_packet does not apply CAN skb specific settings */
if (skb->ip_summed == CHECKSUM_NONE) {
/* init headroom */
can_skb_prv(skb)->ifindex = dev->ifindex;
can_skb_prv(skb)->skbcnt = 0;
skb->ip_summed = CHECKSUM_UNNECESSARY;
/* preform proper loopback on capable devices */
if (dev->flags & IFF_ECHO)
skb->pkt_type = PACKET_LOOPBACK;
else
skb->pkt_type = PACKET_HOST;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
}
return true;
}
/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
static inline bool can_dropped_invalid_skb(struct net_device *dev,
struct sk_buff *skb)
{
const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
if (skb->protocol == htons(ETH_P_CAN)) {
if (unlikely(skb->len != CAN_MTU ||
cfd->len > CAN_MAX_DLEN))
goto inval_skb;
} else if (skb->protocol == htons(ETH_P_CANFD)) {
if (unlikely(skb->len != CANFD_MTU ||
cfd->len > CANFD_MAX_DLEN))
goto inval_skb;
} else
goto inval_skb;
if (!can_skb_headroom_valid(dev, skb))
goto inval_skb;
return false;
inval_skb:
kfree_skb(skb);
dev->stats.tx_dropped++;
return true;
}
static inline bool can_is_canfd_skb(const struct sk_buff *skb)
{
/* the CAN specific type of skb is identified by its data length */
return skb->len == CANFD_MTU;
}
/* helper to define static CAN controller features at device creation time */
static inline void can_set_static_ctrlmode(struct net_device *dev,
u32 static_mode)
{
struct can_priv *priv = netdev_priv(dev);
/* alloc_candev() succeeded => netdev_priv() is valid at this point */
priv->ctrlmode = static_mode;
priv->ctrlmode_static = static_mode;
/* override MTU which was set by default in can_setup()? */
if (static_mode & CAN_CTRLMODE_FD)
dev->mtu = CANFD_MTU;
}
/* get data length from can_dlc with sanitized can_dlc */
u8 can_dlc2len(u8 can_dlc);
/* map the sanitized data length to an appropriate data length code */
u8 can_len2dlc(u8 len);
struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
unsigned int txqs, unsigned int rxqs);
#define alloc_candev(sizeof_priv, echo_skb_max) \
alloc_candev_mqs(sizeof_priv, echo_skb_max, 1, 1)
#define alloc_candev_mq(sizeof_priv, echo_skb_max, count) \
alloc_candev_mqs(sizeof_priv, echo_skb_max, count, count)
void free_candev(struct net_device *dev);
/* a candev safe wrapper around netdev_priv */
struct can_priv *safe_candev_priv(struct net_device *dev);
int open_candev(struct net_device *dev);
void close_candev(struct net_device *dev);
int can_change_mtu(struct net_device *dev, int new_mtu);
int register_candev(struct net_device *dev);
void unregister_candev(struct net_device *dev);
int can_restart_now(struct net_device *dev);
void can_bus_off(struct net_device *dev);
void can_change_state(struct net_device *dev, struct can_frame *cf,
enum can_state tx_state, enum can_state rx_state);
void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
unsigned int idx);
struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx,
u8 *len_ptr);
unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
void can_free_echo_skb(struct net_device *dev, unsigned int idx);
#ifdef CONFIG_OF
void of_can_transceiver(struct net_device *dev);
#else
static inline void of_can_transceiver(struct net_device *dev) { }
#endif
struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
struct sk_buff *alloc_canfd_skb(struct net_device *dev,
struct canfd_frame **cfd);
struct sk_buff *alloc_can_err_skb(struct net_device *dev,
struct can_frame **cf);
#endif /* !_CAN_DEV_H */
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