Revision 7ff57e98fb78ad94edafbdc7435f2d745e9e6bb5 authored by Fabio M. De Francesco on 23 February 2022, 10:02:52 UTC, committed by Jakub Kicinski on 24 February 2022, 17:09:33 UTC
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: 64e28b52c7a6 ("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>
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notifier-error-inject.h
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/atomic.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
struct notifier_err_inject_action {
unsigned long val;
int error;
const char *name;
};
#define NOTIFIER_ERR_INJECT_ACTION(action) \
.name = #action, .val = (action),
struct notifier_err_inject {
struct notifier_block nb;
struct notifier_err_inject_action actions[];
/* The last slot must be terminated with zero sentinel */
};
extern struct dentry *notifier_err_inject_dir;
extern struct dentry *notifier_err_inject_init(const char *name,
struct dentry *parent, struct notifier_err_inject *err_inject,
int priority);
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