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dc8aea47b9
In binder_add_freeze_work() we iterate over the proc->nodes with the
proc->inner_lock held. However, this lock is temporarily dropped in
order to acquire the node->lock first (lock nesting order). This can
race with binder_node_release() and trigger a use-after-free:
==================================================================
BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x19c
Write of size 4 at addr ffff53c04c29dd04 by task freeze/640
CPU: 5 UID: 0 PID: 640 Comm: freeze Not tainted 6.11.0-07343-ga727812a8d45 #17
Hardware name: linux,dummy-virt (DT)
Call trace:
_raw_spin_lock+0xe4/0x19c
binder_add_freeze_work+0x148/0x478
binder_ioctl+0x1e70/0x25ac
__arm64_sys_ioctl+0x124/0x190
Allocated by task 637:
__kmalloc_cache_noprof+0x12c/0x27c
binder_new_node+0x50/0x700
binder_transaction+0x35ac/0x6f74
binder_thread_write+0xfb8/0x42a0
binder_ioctl+0x18f0/0x25ac
__arm64_sys_ioctl+0x124/0x190
Freed by task 637:
kfree+0xf0/0x330
binder_thread_read+0x1e88/0x3a68
binder_ioctl+0x16d8/0x25ac
__arm64_sys_ioctl+0x124/0x190
==================================================================
Fix the race by taking a temporary reference on the node before
releasing the proc->inner lock. This ensures the node remains alive
while in use.
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.