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Jianbo Liu d628ba98eb net/mlx5e: Move representor neigh cleanup to profile cleanup_tx 
[ Upstream commit d03b6e6f31 ]

For IP tunnel encapsulation in ECMP (Equal-Cost Multipath) mode, as
the flow is duplicated to the peer eswitch, the related neighbour
information on the peer uplink representor is created as well.

In the cited commit, eswitch devcom unpair is moved to uplink unload
API, specifically the profile->cleanup_tx. If there is a encap rule
offloaded in ECMP mode, when one eswitch does unpair (because of
unloading the driver, for instance), and the peer rule from the peer
eswitch is going to be deleted, the use-after-free error is triggered
while accessing neigh info, as it is already cleaned up in uplink's
profile->disable, which is before its profile->cleanup_tx.

To fix this issue, move the neigh cleanup to profile's cleanup_tx
callback, and after mlx5e_cleanup_uplink_rep_tx is called. The neigh
init is moved to init_tx for symmeter.

[ 2453.376299] BUG: KASAN: slab-use-after-free in mlx5e_rep_neigh_entry_release+0x109/0x3a0 [mlx5_core]
[ 2453.379125] Read of size 4 at addr ffff888127af9008 by task modprobe/2496

[ 2453.381542] CPU: 7 PID: 2496 Comm: modprobe Tainted: G    B              6.4.0-rc7+ #15
[ 2453.383386] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[ 2453.384335] Call Trace:
[ 2453.384625]  <TASK>
[ 2453.384891]  dump_stack_lvl+0x33/0x50
[ 2453.385285]  print_report+0xc2/0x610
[ 2453.385667]  ? __virt_addr_valid+0xb1/0x130
[ 2453.386091]  ? mlx5e_rep_neigh_entry_release+0x109/0x3a0 [mlx5_core]
[ 2453.386757]  kasan_report+0xae/0xe0
[ 2453.387123]  ? mlx5e_rep_neigh_entry_release+0x109/0x3a0 [mlx5_core]
[ 2453.387798]  mlx5e_rep_neigh_entry_release+0x109/0x3a0 [mlx5_core]
[ 2453.388465]  mlx5e_rep_encap_entry_detach+0xa6/0xe0 [mlx5_core]
[ 2453.389111]  mlx5e_encap_dealloc+0xa7/0x100 [mlx5_core]
[ 2453.389706]  mlx5e_tc_tun_encap_dests_unset+0x61/0xb0 [mlx5_core]
[ 2453.390361]  mlx5_free_flow_attr_actions+0x11e/0x340 [mlx5_core]
[ 2453.391015]  ? complete_all+0x43/0xd0
[ 2453.391398]  ? free_flow_post_acts+0x38/0x120 [mlx5_core]
[ 2453.392004]  mlx5e_tc_del_fdb_flow+0x4ae/0x690 [mlx5_core]
[ 2453.392618]  mlx5e_tc_del_fdb_peers_flow+0x308/0x370 [mlx5_core]
[ 2453.393276]  mlx5e_tc_clean_fdb_peer_flows+0xf5/0x140 [mlx5_core]
[ 2453.393925]  mlx5_esw_offloads_unpair+0x86/0x540 [mlx5_core]
[ 2453.394546]  ? mlx5_esw_offloads_set_ns_peer.isra.0+0x180/0x180 [mlx5_core]
[ 2453.395268]  ? down_write+0xaa/0x100
[ 2453.395652]  mlx5_esw_offloads_devcom_event+0x203/0x530 [mlx5_core]
[ 2453.396317]  mlx5_devcom_send_event+0xbb/0x190 [mlx5_core]
[ 2453.396917]  mlx5_esw_offloads_devcom_cleanup+0xb0/0xd0 [mlx5_core]
[ 2453.397582]  mlx5e_tc_esw_cleanup+0x42/0x120 [mlx5_core]
[ 2453.398182]  mlx5e_rep_tc_cleanup+0x15/0x30 [mlx5_core]
[ 2453.398768]  mlx5e_cleanup_rep_tx+0x6c/0x80 [mlx5_core]
[ 2453.399367]  mlx5e_detach_netdev+0xee/0x120 [mlx5_core]
[ 2453.399957]  mlx5e_netdev_change_profile+0x84/0x170 [mlx5_core]
[ 2453.400598]  mlx5e_vport_rep_unload+0xe0/0xf0 [mlx5_core]
[ 2453.403781]  mlx5_eswitch_unregister_vport_reps+0x15e/0x190 [mlx5_core]
[ 2453.404479]  ? mlx5_eswitch_register_vport_reps+0x200/0x200 [mlx5_core]
[ 2453.405170]  ? up_write+0x39/0x60
[ 2453.405529]  ? kernfs_remove_by_name_ns+0xb7/0xe0
[ 2453.405985]  auxiliary_bus_remove+0x2e/0x40
[ 2453.406405]  device_release_driver_internal+0x243/0x2d0
[ 2453.406900]  ? kobject_put+0x42/0x2d0
[ 2453.407284]  bus_remove_device+0x128/0x1d0
[ 2453.407687]  device_del+0x240/0x550
[ 2453.408053]  ? waiting_for_supplier_show+0xe0/0xe0
[ 2453.408511]  ? kobject_put+0xfa/0x2d0
[ 2453.408889]  ? __kmem_cache_free+0x14d/0x280
[ 2453.409310]  mlx5_rescan_drivers_locked.part.0+0xcd/0x2b0 [mlx5_core]
[ 2453.409973]  mlx5_unregister_device+0x40/0x50 [mlx5_core]
[ 2453.410561]  mlx5_uninit_one+0x3d/0x110 [mlx5_core]
[ 2453.411111]  remove_one+0x89/0x130 [mlx5_core]
[ 2453.411628]  pci_device_remove+0x59/0xf0
[ 2453.412026]  device_release_driver_internal+0x243/0x2d0
[ 2453.412511]  ? parse_option_str+0x14/0x90
[ 2453.412915]  driver_detach+0x7b/0xf0
[ 2453.413289]  bus_remove_driver+0xb5/0x160
[ 2453.413685]  pci_unregister_driver+0x3f/0xf0
[ 2453.414104]  mlx5_cleanup+0xc/0x20 [mlx5_core]

Fixes: 2be5bd42a5 ("net/mlx5: Handle pairing of E-switch via uplink un/load APIs")
Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-08-11 12:08:12 +02:00
arch KVM: s390: fix sthyi error handling 2023-08-11 12:08:11 +02:00
block blk-mq: Fix stall due to recursive flush plug 2023-08-03 10:23:48 +02:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: jitter - correct health test during initialization 2023-07-19 16:21:42 +02:00
Documentation iommu/arm-smmu-v3: Document nesting-related errata 2023-08-11 12:08:09 +02:00
drivers net/mlx5e: Move representor neigh cleanup to profile cleanup_tx 2023-08-11 12:08:12 +02:00
fs erofs: fix wrong primary bvec selection on deduplicated extents 2023-08-11 12:08:11 +02:00
include word-at-a-time: use the same return type for has_zero regardless of endianness 2023-08-11 12:08:11 +02:00
init x86/mm: Initialize text poking earlier 2023-08-08 20:03:49 +02:00
io_uring io_uring: gate iowait schedule on having pending requests 2023-08-11 12:08:08 +02:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel perf: Fix function pointer case 2023-08-11 12:08:09 +02:00
lib lib/bitmap: workaround const_eval test build failure 2023-08-11 12:08:10 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm kasan: add kasan_tag_mismatch prototype 2023-07-23 13:49:32 +02:00
net wifi: cfg80211: Fix return value in scan logic 2023-08-11 12:08:11 +02:00
rust rust: kernel: Mark rust_fmt_argument as extern "C" 2023-04-26 14:28:38 +02:00
samples samples: ftrace: Save required argument registers in sample trampolines 2023-07-23 13:49:44 +02:00
scripts scripts/kallsyms: update the usage in the comment block 2023-07-27 08:50:50 +02:00
security security: keys: Modify mismatched function name 2023-07-27 08:50:43 +02:00
sound ASoC: wm8904: Fill the cache for WM8904_ADC_TEST_0 register 2023-08-03 10:24:16 +02:00
tools x86/srso: Add a Speculative RAS Overflow mitigation 2023-08-08 20:03:50 +02:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Grab a reference to KVM for VM and vCPU stats file descriptors 2023-08-03 10:24:08 +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 smb: move client and server files to common directory fs/smb 2023-06-28 11:12:40 +02:00
Makefile Linux 6.1.44 2023-08-08 20:03:51 +02:00
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.