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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 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* PNET table queries
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Thomas Richter <tmricht@linux.vnet.ibm.com>
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*/
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#ifndef _SMC_PNET_H
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#define _SMC_PNET_H
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#include <net/smc.h>
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#if IS_ENABLED(CONFIG_HAVE_PNETID)
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#include <asm/pnet.h>
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#endif
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struct smc_ib_device;
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struct smcd_dev;
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struct smc_init_info;
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struct smc_link_group;
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/**
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* struct smc_pnettable - SMC PNET table anchor
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* @lock: Lock for list action
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* @pnetlist: List of PNETIDs
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*/
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struct smc_pnettable {
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struct mutex lock;
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struct list_head pnetlist;
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};
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struct smc_pnetids_ndev { /* list of pnetids for net devices in UP state*/
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struct list_head list;
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rwlock_t lock;
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};
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struct smc_pnetids_ndev_entry {
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struct list_head list;
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u8 pnetid[SMC_MAX_PNETID_LEN];
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refcount_t refcnt;
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};
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static inline int smc_pnetid_by_dev_port(struct device *dev,
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unsigned short port, u8 *pnetid)
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{
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#if IS_ENABLED(CONFIG_HAVE_PNETID)
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return pnet_id_by_dev_port(dev, port, pnetid);
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#else
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return -ENOENT;
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#endif
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}
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int smc_pnet_init(void) __init;
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int smc_pnet_net_init(struct net *net);
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void smc_pnet_exit(void);
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void smc_pnet_net_exit(struct net *net);
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void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini);
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void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini);
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int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port);
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int smc_pnetid_by_table_smcd(struct smcd_dev *smcd);
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void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
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struct smc_init_info *ini,
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struct smc_ib_device *known_dev);
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bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid);
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bool smc_pnet_is_pnetid_set(u8 *pnetid);
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#endif
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