mirror of
https://github.com/torvalds/linux
synced 2024-07-09 04:38:56 +00:00
7ff57e98fb
smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib()
which, in turn, calls mutex_lock(&smc_ib_devices.mutex).
read_lock() disables preemption. Therefore, the code acquires a mutex while in
atomic context and it leads to a SAC bug.
Fix this bug by replacing the rwlock with a mutex.
Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
Fixes: 64e28b52c7 ("net/smc: add pnet table namespace support")
Confirmed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Shared Memory Communications over RDMA (SMC-R) and RoCE
|
|
*
|
|
* PNET table queries
|
|
*
|
|
* Copyright IBM Corp. 2016
|
|
*
|
|
* Author(s): Thomas Richter <tmricht@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#ifndef _SMC_PNET_H
|
|
#define _SMC_PNET_H
|
|
|
|
#include <net/smc.h>
|
|
|
|
#if IS_ENABLED(CONFIG_HAVE_PNETID)
|
|
#include <asm/pnet.h>
|
|
#endif
|
|
|
|
struct smc_ib_device;
|
|
struct smcd_dev;
|
|
struct smc_init_info;
|
|
struct smc_link_group;
|
|
|
|
/**
|
|
* struct smc_pnettable - SMC PNET table anchor
|
|
* @lock: Lock for list action
|
|
* @pnetlist: List of PNETIDs
|
|
*/
|
|
struct smc_pnettable {
|
|
struct mutex lock;
|
|
struct list_head pnetlist;
|
|
};
|
|
|
|
struct smc_pnetids_ndev { /* list of pnetids for net devices in UP state*/
|
|
struct list_head list;
|
|
rwlock_t lock;
|
|
};
|
|
|
|
struct smc_pnetids_ndev_entry {
|
|
struct list_head list;
|
|
u8 pnetid[SMC_MAX_PNETID_LEN];
|
|
refcount_t refcnt;
|
|
};
|
|
|
|
static inline int smc_pnetid_by_dev_port(struct device *dev,
|
|
unsigned short port, u8 *pnetid)
|
|
{
|
|
#if IS_ENABLED(CONFIG_HAVE_PNETID)
|
|
return pnet_id_by_dev_port(dev, port, pnetid);
|
|
#else
|
|
return -ENOENT;
|
|
#endif
|
|
}
|
|
|
|
int smc_pnet_init(void) __init;
|
|
int smc_pnet_net_init(struct net *net);
|
|
void smc_pnet_exit(void);
|
|
void smc_pnet_net_exit(struct net *net);
|
|
void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini);
|
|
void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini);
|
|
int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port);
|
|
int smc_pnetid_by_table_smcd(struct smcd_dev *smcd);
|
|
void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
|
|
struct smc_init_info *ini,
|
|
struct smc_ib_device *known_dev);
|
|
bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid);
|
|
bool smc_pnet_is_pnetid_set(u8 *pnetid);
|
|
#endif
|