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ChenXiaoSong 93a3cda161 smb/server: fix use-after-free in ksmbd_conn_transport_destroy()
Reproducer (Link[1]):

  1. Build kernel with CONFIG_KASAN=y
  2. server: systemctl start ksmbd
  3. client: mount -t cifs //localhost/export /mnt
  4. client: umount /mnt
  5. server: modprobe -r ksmbd

The error message is as follows:

  ==================================================================
  BUG: KASAN: slab-use-after-free in proc_remove+0x3e/0x80
  Read of size 8 at addr ffff88810654e098 by task modprobe/785
  ...
  Call Trace:
   <TASK>
   __dump_stack+0x19/0x30
   dump_stack_lvl+0x49/0x60
   print_address_description+0x7b/0x200
   print_report+0x5b/0x70
   kasan_report+0xed/0x130
   __asan_report_load8_noabort+0x18/0x20
   proc_remove+0x3e/0x80
   ksmbd_conn_transport_destroy+0x2b/0x320 [ksmbd]
   cleanup_module+0x33/0xe00 [ksmbd]
   __se_sys_delete_module+0x276/0x400
   __x64_sys_delete_module+0x5f/0x70
   x64_sys_call+0x2675/0x3030
   do_syscall_64+0xf0/0x3b0
   entry_SYSCALL_64_after_hwframe+0x76/0x7e
  RIP: 0033:0x7f5b56d2b02b
  ...
   </TASK>

  Allocated by task 159:
   kasan_save_track+0x2f/0x70
   kasan_save_alloc_info+0x40/0x50
   __kasan_slab_alloc+0x52/0x70
   kmem_cache_alloc_noprof+0x168/0x3e0
   __proc_create+0x20b/0x710
   proc_create_single_data+0x78/0x150
   ksmbd_proc_create+0x24/0x30 [ksmbd]
   ksmbd_conn_transport_init+0x4f/0x80 [ksmbd]
   server_ctrl_handle_work+0x64/0x2c0 [ksmbd]
   process_scheduled_works+0x788/0xec0
   worker_thread+0x894/0xc10
   kthread+0x2e5/0x3c0
   ret_from_fork+0x168/0x4f0
   ret_from_fork_asm+0x1a/0x30

  Freed by task 785:
   kasan_save_track+0x2f/0x70
   kasan_save_free_info+0x4a/0x60
   __kasan_slab_free+0x47/0x70
   kmem_cache_free+0x122/0x410
   pde_put+0xfd/0x160
   remove_proc_subtree+0x365/0x540
   proc_remove+0x6a/0x80
   ksmbd_proc_cleanup+0x1f/0x60 [ksmbd]
   cleanup_module+0x18/0xe00 [ksmbd]
   __se_sys_delete_module+0x276/0x400
   __x64_sys_delete_module+0x5f/0x70
   x64_sys_call+0x2675/0x3030
   do_syscall_64+0xf0/0x3b0
   entry_SYSCALL_64_after_hwframe+0x76/0x7e
  ==================================================================

Reported-by: Kyenghwan Hwang <obnred@gmail.com>
Link[1]: https://lore.kernel.org/linux-cifs/8ea028f5-90f4-4d21-b1ac-a343f0f04d88@chenxiaosong.com/
Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
History 2026-08-17 22:38:22 +09:00
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Linux kernel
============

The Linux kernel is the core of any Linux operating system. It manages hardware,
system resources, and provides the fundamental services for all other software.

Quick Start
-----------

* Report a bug: See Documentation/admin-guide/reporting-issues.rst
* Get the latest kernel: https://kernel.org
* Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst
* Join the community: https://lore.kernel.org/

Essential Documentation
-----------------------

All users should be familiar with:

* Building requirements: Documentation/process/changes.rst
* Code of Conduct: Documentation/process/code-of-conduct.rst
* License: See COPYING

Documentation can be built with make htmldocs or viewed online at:
https://www.kernel.org/doc/html/latest/


Who Are You?
============

Find your role below:

* New Kernel Developer - Getting started with kernel development
* Academic Researcher - Studying kernel internals and architecture
* Security Expert - Hardening and vulnerability analysis
* Backport/Maintenance Engineer - Maintaining stable kernels
* System Administrator - Configuring and troubleshooting
* Maintainer - Leading subsystems and reviewing patches
* Hardware Vendor - Writing drivers for new hardware
* Distribution Maintainer - Packaging kernels for distros
* AI Coding Assistant - LLMs and AI-powered development tools


For Specific Users
==================

New Kernel Developer
--------------------

Welcome! Start your kernel development journey here:

* Getting Started: Documentation/process/development-process.rst
* Your First Patch: Documentation/process/submitting-patches.rst
* Coding Style: Documentation/process/coding-style.rst
* Build System: Documentation/kbuild/index.rst
* Development Tools: Documentation/dev-tools/index.rst
* Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst
* Core APIs: Documentation/core-api/index.rst

Academic Researcher
-------------------

Explore the kernel's architecture and internals:

* Researcher Guidelines: Documentation/process/researcher-guidelines.rst
* Memory Management: Documentation/mm/index.rst
* Scheduler: Documentation/scheduler/index.rst
* Networking Stack: Documentation/networking/index.rst
* Filesystems: Documentation/filesystems/index.rst
* RCU (Read-Copy Update): Documentation/RCU/index.rst
* Locking Primitives: Documentation/locking/index.rst
* Power Management: Documentation/power/index.rst

Security Expert
---------------

Security documentation and hardening guides:

* Security Documentation: Documentation/security/index.rst
* LSM Development: Documentation/security/lsm-development.rst
* Self Protection: Documentation/security/self-protection.rst
* Reporting Vulnerabilities: Documentation/process/security-bugs.rst
* CVE Procedures: Documentation/process/cve.rst
* Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst
* Security Features: Documentation/userspace-api/seccomp_filter.rst

Backport/Maintenance Engineer
-----------------------------

Maintain and stabilize kernel versions:

* Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst
* Backporting Guide: Documentation/process/backporting.rst
* Applying Patches: Documentation/process/applying-patches.rst
* Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst
* Git for Maintainers: Documentation/maintainer/configure-git.rst

System Administrator
--------------------

Configure, tune, and troubleshoot Linux systems:

* Admin Guide: Documentation/admin-guide/index.rst
* Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst
* Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst
* Tracing/Debugging: Documentation/trace/index.rst
* Performance Security: Documentation/admin-guide/perf-security.rst
* Hardware Monitoring: Documentation/hwmon/index.rst

Maintainer
----------

Lead kernel subsystems and manage contributions:

* Maintainer Handbook: Documentation/maintainer/index.rst
* Pull Requests: Documentation/maintainer/pull-requests.rst
* Managing Patches: Documentation/maintainer/modifying-patches.rst
* Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst
* Development Process: Documentation/process/maintainer-handbooks.rst
* Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst
* Git Configuration: Documentation/maintainer/configure-git.rst

Hardware Vendor
---------------

Write drivers and support new hardware:

* Driver API Guide: Documentation/driver-api/index.rst
* Driver Model: Documentation/driver-api/driver-model/driver.rst
* Device Drivers: Documentation/driver-api/infrastructure.rst
* Bus Types: Documentation/driver-api/driver-model/bus.rst
* Device Tree Bindings: Documentation/devicetree/bindings/
* Power Management: Documentation/driver-api/pm/index.rst
* DMA API: Documentation/core-api/dma-api.rst

Distribution Maintainer
-----------------------

Package and distribute the kernel:

* Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst
* ABI Documentation: Documentation/ABI/README
* Kernel Configuration: Documentation/kbuild/kconfig.rst
* Module Signing: Documentation/admin-guide/module-signing.rst
* Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst
* Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst

AI Coding Assistant
-------------------

CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and
follow the AI coding assistants documentation before contributing to the Linux
kernel:

* Documentation/process/coding-assistants.rst

This documentation contains essential requirements about licensing, attribution,
and the Developer Certificate of Origin that all AI tools must comply with.


Communication and Support
=========================

* Mailing Lists: https://lore.kernel.org/
* IRC: #kernelnewbies on irc.oftc.net
* Bugzilla: https://bugzilla.kernel.org/
* MAINTAINERS file: Lists subsystem maintainers and mailing lists
* Email Clients: Documentation/process/email-clients.rst