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Niranjana Vishwanathapura
2988cf02ee
The wait_event_timeout() on g2h_fence.wq which is declared on stack can return before the wake_up() gets called, resulting in a stack out of bound access when wake_up() accesses the g2h_fene.wq. Do not declare g2h_fence related wait_queue_head_t on stack. Fixes the below KASAN BUG and associated kernel crashes. BUG: KASAN: stack-out-of-bounds in do_raw_spin_lock+0x6f/0x1e0 Read of size 4 at addr ffff88826252f4ac by task kworker/u128:5/467 CPU: 25 PID: 467 Comm: kworker/u128:5 Tainted: G U 6.3.0-rc4-xe #1 Workqueue: events_unbound g2h_worker_func [xe] Call Trace: <TASK> dump_stack_lvl+0x64/0xb0 print_report+0xc2/0x600 kasan_report+0x96/0xc0 do_raw_spin_lock+0x6f/0x1e0 _raw_spin_lock_irqsave+0x47/0x60 __wake_up_common_lock+0xc0/0x150 dequeue_one_g2h+0x20f/0x6a0 [xe] g2h_worker_func+0xa9/0x180 [xe] process_one_work+0x527/0x990 worker_thread+0x2d1/0x640 kthread+0x174/0x1b0 ret_from_fork+0x29/0x50 </TASK> Tested-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Bruce Chang <yu.bruce.chang@intel.com> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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 Restructured Text 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.