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
index.rst
========================================
The Linux driver implementer's API guide
========================================
The kernel offers a wide variety of interfaces to support the development
of device drivers. This document is an only somewhat organized collection
of some of those interfaces — it will hopefully get better over time! The
available subsections can be seen below.
.. class:: toc-title
Table of contents
.. toctree::
:maxdepth: 2
driver-model/index
basics
infrastructure
ioctl
early-userspace/index
pm/index
clk
device-io
dma-buf
device_link
component
message-based
infiniband
frame-buffer
regulator
reset
iio/index
input
usb/index
firewire
pci/index
cxl/index
spi
i2c
ipmb
ipmi
i3c/index
interconnect
devfreq
hsi
edac
scsi
libata
target
mailbox
mtdnand
miscellaneous
mei/index
mtd/index
mmc/index
nvdimm/index
w1
rapidio/index
s390-drivers
vme
80211/index
uio-howto
firmware/index
pin-control
gpio/index
md/index
media/index
misc_devices
nfc/index
dmaengine/index
slimbus
soundwire/index
thermal/index
fpga/index
acpi/index
auxiliary_bus
backlight/lp855x-driver.rst
connector
console
dcdbas
eisa
isa
isapnp
io-mapping
io_ordering
generic-counter
memory-devices/index
men-chameleon-bus
ntb
nvmem
parport-lowlevel
pps
ptp
phy/index
pwm
pldmfw/index
rfkill
serial/index
sm501
surface_aggregator/index
switchtec
sync_file
vfio-mediated-device
vfio
xilinx/index
xillybus
zorro
.. only:: subproject and html
Indices
=======
* :ref:`genindex`
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