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Shifeng Li 01877daaef net/mlx5e: Fix a race in command alloc flow 
[ Upstream commit 8f5100da56 ]

Fix a cmd->ent use after free due to a race on command entry.
Such race occurs when one of the commands releases its last refcount and
frees its index and entry while another process running command flush
flow takes refcount to this command entry. The process which handles
commands flush may see this command as needed to be flushed if the other
process allocated a ent->idx but didn't set ent to cmd->ent_arr in
cmd_work_handler(). Fix it by moving the assignment of cmd->ent_arr into
the spin lock.

[70013.081955] BUG: KASAN: use-after-free in mlx5_cmd_trigger_completions+0x1e2/0x4c0 [mlx5_core]
[70013.081967] Write of size 4 at addr ffff88880b1510b4 by task kworker/26:1/1433361
[70013.081968]
[70013.082028] Workqueue: events aer_isr
[70013.082053] Call Trace:
[70013.082067]  dump_stack+0x8b/0xbb
[70013.082086]  print_address_description+0x6a/0x270
[70013.082102]  kasan_report+0x179/0x2c0
[70013.082173]  mlx5_cmd_trigger_completions+0x1e2/0x4c0 [mlx5_core]
[70013.082267]  mlx5_cmd_flush+0x80/0x180 [mlx5_core]
[70013.082304]  mlx5_enter_error_state+0x106/0x1d0 [mlx5_core]
[70013.082338]  mlx5_try_fast_unload+0x2ea/0x4d0 [mlx5_core]
[70013.082377]  remove_one+0x200/0x2b0 [mlx5_core]
[70013.082409]  pci_device_remove+0xf3/0x280
[70013.082439]  device_release_driver_internal+0x1c3/0x470
[70013.082453]  pci_stop_bus_device+0x109/0x160
[70013.082468]  pci_stop_and_remove_bus_device+0xe/0x20
[70013.082485]  pcie_do_fatal_recovery+0x167/0x550
[70013.082493]  aer_isr+0x7d2/0x960
[70013.082543]  process_one_work+0x65f/0x12d0
[70013.082556]  worker_thread+0x87/0xb50
[70013.082571]  kthread+0x2e9/0x3a0
[70013.082592]  ret_from_fork+0x1f/0x40

The logical relationship of this error is as follows:

             aer_recover_work              |          ent->work
-------------------------------------------+------------------------------
aer_recover_work_func                      |
|- pcie_do_recovery                        |
  |- report_error_detected                 |
    |- mlx5_pci_err_detected               |cmd_work_handler
      |- mlx5_enter_error_state            |  |- cmd_alloc_index
        |- enter_error_state               |    |- lock cmd->alloc_lock
          |- mlx5_cmd_flush                |    |- clear_bit
            |- mlx5_cmd_trigger_completions|    |- unlock cmd->alloc_lock
              |- lock cmd->alloc_lock      |
              |- vector = ~dev->cmd.vars.bitmask
              |- for_each_set_bit          |
                |- cmd_ent_get(cmd->ent_arr[i]) (UAF)
              |- unlock cmd->alloc_lock    |  |- cmd->ent_arr[ent->idx]=ent

The cmd->ent_arr[ent->idx] assignment and the bit clearing are not
protected by the cmd->alloc_lock in cmd_work_handler().

Fixes: 50b2412b7e ("net/mlx5: Avoid possible free of command entry while timeout comp handler")
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Shifeng Li <lishifeng@sangfor.com.cn>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-01-01 12:38:55 +00:00
arch s390/vx: fix save/restore of fpu kernel context 2024-01-01 12:38:53 +00:00
block blk-cgroup: bypass blkcg_deactivate_policy after destroying 2023-12-20 17:00:21 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: pcrypt - Fix hungtask for PADATA_RESET 2023-11-28 17:06:58 +00:00
Documentation tee: optee: Fix supplicant based device enumeration 2023-12-13 18:39:12 +01:00
drivers net/mlx5e: Fix a race in command alloc flow 2024-01-01 12:38:55 +00:00
fs smb: client: fix OOB in smb2_query_reparse_point() 2023-12-20 17:00:27 +01:00
include net/mlx5: Re-organize mlx5_cmd struct 2024-01-01 12:38:55 +00:00
init proc: sysctl: prevent aliased sysctls from getting passed to init 2023-11-28 17:07:08 +00:00
io_uring io_uring: fix mutex_unlock with unreferenced ctx 2023-12-13 18:39:18 +01:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel bpf: Fix prog_array_map_poke_run map poke update 2024-01-01 12:38:52 +00:00
lib zstd: Fix array-index-out-of-bounds UBSAN warning 2023-12-13 18:39:04 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm kasan: disable kasan_non_canonical_hook() for HW tags 2024-01-01 12:38:52 +00:00
net wifi: mac80211: mesh_plink: fix matches_local logic 2024-01-01 12:38:54 +00:00
rust rust: allocator: Prevent mis-aligned allocation 2023-08-11 12:08:18 +02:00
samples fprobe: Pass entry_data to handlers 2023-10-25 12:03:12 +02:00
scripts sign-file: Fix incorrect return values check 2023-12-20 17:00:19 +01:00
security ima: detect changes to the backing overlay file 2023-11-28 17:07:12 +00:00
sound ALSA: hda/realtek: Apply mute LED quirk for HP15-db 2023-12-20 17:00:20 +01:00
tools selftests/bpf: fix bpf_loop_bench for new callback verification scheme 2023-12-20 17:00:23 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add() 2023-09-13 09:42:46 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.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: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS devlink: move code to a dedicated directory 2023-08-30 16:11:00 +02:00
Makefile Linux 6.1.69 2023-12-20 17:00:29 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.