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>
1 parent e13ad14
tmp108.rst
Kernel driver tmp108
====================
Supported chips:
* Texas Instruments TMP108
Prefix: 'tmp108'
Addresses scanned: none
Datasheet: https://www.ti.com/product/tmp108
Author:
John Muir <john@jmuir.com>
Description
-----------
The Texas Instruments TMP108 implements one temperature sensor. An alert pin
can be set when temperatures exceed minimum or maximum values plus or minus a
hysteresis value. (This driver does not support interrupts for the alert pin,
and the device runs in comparator mode.)
The sensor is accurate to 0.75C over the range of -25 to +85 C, and to 1.0
degree from -40 to +125 C. Resolution of the sensor is 0.0625 degree. The
operating temperature has a minimum of -55 C and a maximum of +150 C.
Hysteresis values can be set to 0, 1, 2, or 4C.
The TMP108 has a programmable update rate that can select between 8, 4, 1, and
0.5 Hz.
By default the TMP108 reads the temperature continuously. To conserve power,
the TMP108 has a one-shot mode where the device is normally shut-down. When a
one shot is requested the temperature is read, the result can be retrieved,
and then the device is shut down automatically. (This driver only supports
continuous mode.)
The driver provides the common sysfs-interface for temperatures (see
Documentation/hwmon/sysfs-interface.rst under Temperatures).
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