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e52b43883d
With CONFIG_CPUMASK_OFFSTACK=y, the 'bind_writers' buffer is allocated via
alloc_cpumask_var() in param_set_cpumask(). But it is not freed, when
setting the module parameter multiple times by sysfs interface or removing
module.
Below kmemleak trace is seen for this issue:
unreferenced object 0xffff888100aabff8 (size 8):
comm "bash", pid 323, jiffies 4295059233
hex dump (first 8 bytes):
07 00 00 00 00 00 00 00 ........
backtrace (crc ac50919):
__kmalloc_node_noprof+0x2e5/0x420
alloc_cpumask_var_node+0x1f/0x30
param_set_cpumask+0x26/0xb0 [locktorture]
param_attr_store+0x93/0x100
module_attr_store+0x1b/0x30
kernfs_fop_write_iter+0x114/0x1b0
vfs_write+0x300/0x410
ksys_write+0x60/0xd0
do_syscall_64+0xa4/0x260
entry_SYSCALL_64_after_hwframe+0x77/0x7f
This issue can be reproduced by:
insmod locktorture.ko bind_writers=1
rmmod locktorture
or:
insmod locktorture.ko bind_writers=1
echo 2 > /sys/module/locktorture/parameters/bind_writers
Considering that setting the module parameter 'bind_writers' or
'bind_readers' by sysfs interface has no real effect, set the parameter
permissions to 0444. To fix the memory leak when removing module, free
'bind_writers' and 'bind_readers' memory in lock_torture_cleanup().
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.