kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00
Code Issues Releases Packages Activity
No description
1,399,405 commits 117 branches 5,827 tags 6.3 GiB
  • C 96.8%
  • Assembly 0.9%
  • Rust 0.7%
  • Shell 0.6%
  • Python 0.5%
  • Other 0.3%
Find a file
Duoming Zhou a880ef71a1 usb: typec: ucsi: fix use-after-free caused by uec->work 
commit 2b7a0f47aa upstream.

The delayed work uec->work is scheduled in gaokun_ucsi_probe()
but never properly canceled in gaokun_ucsi_remove(). This creates
use-after-free scenarios where the ucsi and gaokun_ucsi structure
are freed after ucsi_destroy() completes execution, while the
gaokun_ucsi_register_worker() might be either currently executing
or still pending in the work queue. The already-freed gaokun_ucsi
or ucsi structure may then be accessed.

Furthermore, the race window is 3 seconds, which is sufficiently
long to make this bug easily reproducible. The following is the
trace captured by KASAN:

==================================================================
BUG: KASAN: slab-use-after-free in __run_timers+0x5ec/0x630
Write of size 8 at addr ffff00000ec28cc8 by task swapper/0/0
...
Call trace:
 show_stack+0x18/0x24 (C)
 dump_stack_lvl+0x78/0x90
 print_report+0x114/0x580
 kasan_report+0xa4/0xf0
 __asan_report_store8_noabort+0x20/0x2c
 __run_timers+0x5ec/0x630
 run_timer_softirq+0xe8/0x1cc
 handle_softirqs+0x294/0x720
 __do_softirq+0x14/0x20
 ____do_softirq+0x10/0x1c
 call_on_irq_stack+0x30/0x48
 do_softirq_own_stack+0x1c/0x28
 __irq_exit_rcu+0x27c/0x364
 irq_exit_rcu+0x10/0x1c
 el1_interrupt+0x40/0x60
 el1h_64_irq_handler+0x18/0x24
 el1h_64_irq+0x6c/0x70
 arch_local_irq_enable+0x4/0x8 (P)
 do_idle+0x334/0x458
 cpu_startup_entry+0x60/0x70
 rest_init+0x158/0x174
 start_kernel+0x2f8/0x394
 __primary_switched+0x8c/0x94

Allocated by task 72 on cpu 0 at 27.510341s:
 kasan_save_stack+0x2c/0x54
 kasan_save_track+0x24/0x5c
 kasan_save_alloc_info+0x40/0x54
 __kasan_kmalloc+0xa0/0xb8
 __kmalloc_node_track_caller_noprof+0x1c0/0x588
 devm_kmalloc+0x7c/0x1c8
 gaokun_ucsi_probe+0xa0/0x840  auxiliary_bus_probe+0x94/0xf8
 really_probe+0x17c/0x5b8
 __driver_probe_device+0x158/0x2c4
 driver_probe_device+0x10c/0x264
 __device_attach_driver+0x168/0x2d0
 bus_for_each_drv+0x100/0x188
 __device_attach+0x174/0x368
 device_initial_probe+0x14/0x20
 bus_probe_device+0x120/0x150
 device_add+0xb3c/0x10fc
 __auxiliary_device_add+0x88/0x130
...

Freed by task 73 on cpu 1 at 28.910627s:
 kasan_save_stack+0x2c/0x54
 kasan_save_track+0x24/0x5c
 __kasan_save_free_info+0x4c/0x74
 __kasan_slab_free+0x60/0x8c
 kfree+0xd4/0x410
 devres_release_all+0x140/0x1f0
 device_unbind_cleanup+0x20/0x190
 device_release_driver_internal+0x344/0x460
 device_release_driver+0x18/0x24
 bus_remove_device+0x198/0x274
 device_del+0x310/0xa84
...

The buggy address belongs to the object at ffff00000ec28c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 200 bytes inside of
 freed 512-byte region
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ec28
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x3fffe0000000040(head|node=0|zone=0|lastcpupid=0x1ffff)
page_type: f5(slab)
raw: 03fffe0000000040 ffff000008801c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 03fffe0000000040 ffff000008801c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 03fffe0000000002 fffffdffc03b0a01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00000ec28b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff00000ec28c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff00000ec28c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff00000ec28d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00000ec28d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Add disable_delayed_work_sync() in gaokun_ucsi_remove() to ensure
that uec->work is properly canceled and prevented from executing
after the ucsi and gaokun_ucsi structure have been deallocated.

Fixes: 00327d7f2c ("usb: typec: ucsi: add Huawei Matebook E Go ucsi driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/cc31e12ef9ffbf86676585b02233165fd33f0d8e.1764065838.git.duoming@zju.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-12-18 14:03:42 +01:00
arch perf/x86/intel: Fix NULL event dereference crash in handle_pmi_common() 2025-12-18 14:03:41 +01:00
block block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock 2025-12-18 14:03:40 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: ahash - Zero positive err value in ahash_update_finish 2025-12-18 14:03:12 +01:00
Documentation docs: hwmon: fix link to g762 devicetree binding 2025-12-18 14:03:38 +01:00
drivers usb: typec: ucsi: fix use-after-free caused by uec->work 2025-12-18 14:03:42 +01:00
fs ocfs2: fix memory leak in ocfs2_merge_rec_left() 2025-12-18 14:03:41 +01:00
include efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs 2025-12-18 14:03:41 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/kbuf: use READ_ONCE() for userspace-mapped memory 2025-12-18 14:03:36 +01:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel cpu: Make atomic hotplug callbacks run with interrupts disabled on UP 2025-12-18 14:03:41 +01:00
lib lib/vsprintf: Check pointer before dereferencing in time_and_date() 2025-12-18 14:02:58 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
net net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop 2025-12-18 14:03:31 +01:00
rust rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags 2025-11-10 08:37:06 +08:00
samples samples: work around glibc redefining some of our defines wrong 2025-11-21 09:29:02 -08:00
scripts kbuild: install-extmod-build: Properly fix CC expansion when ccache is used 2025-12-18 14:03:33 +01:00
security landlock: Fix handling of disconnected directories 2025-12-18 14:03:27 +01:00
sound ASoC: amd: acp: update tdm channels for specific DAI 2025-12-18 14:03:40 +01:00
tools perf stat: Allow no events to open if this is a "--null" run 2025-12-18 14:03:32 +01:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-04 09:16:53 -08:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.1 2025-12-12 18:42:47 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

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.