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c8fafb3485
A sched_ext scheduler may trigger __scx_exit() from a BPF timer
callback, where scx_root may not be safely dereferenced.
This can lead to a NULL pointer dereference as shown below (triggered by
scx_tickless):
BUG: kernel NULL pointer dereference, address: 0000000000000330
...
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.14.0-virtme #1 PREEMPT(full)
RIP: 0010:__scx_exit+0x2b/0x190
...
Call Trace:
<IRQ>
scx_bpf_get_idle_smtmask+0x59/0x80
bpf_prog_8320d4217989178c_dispatch_all_cpus+0x35/0x1b6
...
bpf_prog_97f847d871513f95_sched_timerfn+0x4c/0x264
bpf_timer_cb+0x7a/0x140
__hrtimer_run_queues+0x1f9/0x3a0
hrtimer_run_softirq+0x8c/0xd0
handle_softirqs+0xd3/0x3d0
__irq_exit_rcu+0x9a/0xc0
irq_exit_rcu+0xe/0x20
Fix this by checking for a valid scx_root and adding proper RCU
protection.
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.