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Vlad Buslov 27b0420fd9 net/mlx5e: Lag, Fix use-after-free in fib event handler 
Recent commit that modified fib route event handler to handle events
according to their priority introduced use-after-free[0] in mp->mfi pointer
usage. The pointer now is not just cached in order to be compared to
following fib_info instances, but is also dereferenced to obtain
fib_priority. However, since mlx5 lag code doesn't hold the reference to
fin_info during whole mp->mfi lifetime, it could be used after fib_info
instance has already been freed be kernel infrastructure code.

Don't ever dereference mp->mfi pointer. Refactor it to be 'const void*'
type and cache fib_info priority in dedicated integer. Group
fib_info-related data into dedicated 'fib' structure that will be further
extended by following patches in the series.

[0]:

[  203.588029] ==================================================================
[  203.590161] BUG: KASAN: use-after-free in mlx5_lag_fib_update+0xabd/0xd60 [mlx5_core]
[  203.592386] Read of size 4 at addr ffff888144df2050 by task kworker/u20:4/138

[  203.594766] CPU: 3 PID: 138 Comm: kworker/u20:4 Tainted: G    B             5.17.0-rc7+ #6
[  203.596751] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[  203.598813] Workqueue: mlx5_lag_mp mlx5_lag_fib_update [mlx5_core]
[  203.600053] Call Trace:
[  203.600608]  <TASK>
[  203.601110]  dump_stack_lvl+0x48/0x5e
[  203.601860]  print_address_description.constprop.0+0x1f/0x160
[  203.602950]  ? mlx5_lag_fib_update+0xabd/0xd60 [mlx5_core]
[  203.604073]  ? mlx5_lag_fib_update+0xabd/0xd60 [mlx5_core]
[  203.605177]  kasan_report.cold+0x83/0xdf
[  203.605969]  ? mlx5_lag_fib_update+0xabd/0xd60 [mlx5_core]
[  203.607102]  mlx5_lag_fib_update+0xabd/0xd60 [mlx5_core]
[  203.608199]  ? mlx5_lag_init_fib_work+0x1c0/0x1c0 [mlx5_core]
[  203.609382]  ? read_word_at_a_time+0xe/0x20
[  203.610463]  ? strscpy+0xa0/0x2a0
[  203.611463]  process_one_work+0x722/0x1270
[  203.612344]  worker_thread+0x540/0x11e0
[  203.613136]  ? rescuer_thread+0xd50/0xd50
[  203.613949]  kthread+0x26e/0x300
[  203.614627]  ? kthread_complete_and_exit+0x20/0x20
[  203.615542]  ret_from_fork+0x1f/0x30
[  203.616273]  </TASK>

[  203.617174] Allocated by task 3746:
[  203.617874]  kasan_save_stack+0x1e/0x40
[  203.618644]  __kasan_kmalloc+0x81/0xa0
[  203.619394]  fib_create_info+0xb41/0x3c50
[  203.620213]  fib_table_insert+0x190/0x1ff0
[  203.621020]  fib_magic.isra.0+0x246/0x2e0
[  203.621803]  fib_add_ifaddr+0x19f/0x670
[  203.622563]  fib_inetaddr_event+0x13f/0x270
[  203.623377]  blocking_notifier_call_chain+0xd4/0x130
[  203.624355]  __inet_insert_ifa+0x641/0xb20
[  203.625185]  inet_rtm_newaddr+0xc3d/0x16a0
[  203.626009]  rtnetlink_rcv_msg+0x309/0x880
[  203.626826]  netlink_rcv_skb+0x11d/0x340
[  203.627626]  netlink_unicast+0x4cc/0x790
[  203.628430]  netlink_sendmsg+0x762/0xc00
[  203.629230]  sock_sendmsg+0xb2/0xe0
[  203.629955]  ____sys_sendmsg+0x58a/0x770
[  203.630756]  ___sys_sendmsg+0xd8/0x160
[  203.631523]  __sys_sendmsg+0xb7/0x140
[  203.632294]  do_syscall_64+0x35/0x80
[  203.633045]  entry_SYSCALL_64_after_hwframe+0x44/0xae

[  203.634427] Freed by task 0:
[  203.635063]  kasan_save_stack+0x1e/0x40
[  203.635844]  kasan_set_track+0x21/0x30
[  203.636618]  kasan_set_free_info+0x20/0x30
[  203.637450]  __kasan_slab_free+0xfc/0x140
[  203.638271]  kfree+0x94/0x3b0
[  203.638903]  rcu_core+0x5e4/0x1990
[  203.639640]  __do_softirq+0x1ba/0x5d3

[  203.640828] Last potentially related work creation:
[  203.641785]  kasan_save_stack+0x1e/0x40
[  203.642571]  __kasan_record_aux_stack+0x9f/0xb0
[  203.643478]  call_rcu+0x88/0x9c0
[  203.644178]  fib_release_info+0x539/0x750
[  203.644997]  fib_table_delete+0x659/0xb80
[  203.645809]  fib_magic.isra.0+0x1a3/0x2e0
[  203.646617]  fib_del_ifaddr+0x93f/0x1300
[  203.647415]  fib_inetaddr_event+0x9f/0x270
[  203.648251]  blocking_notifier_call_chain+0xd4/0x130
[  203.649225]  __inet_del_ifa+0x474/0xc10
[  203.650016]  devinet_ioctl+0x781/0x17f0
[  203.650788]  inet_ioctl+0x1ad/0x290
[  203.651533]  sock_do_ioctl+0xce/0x1c0
[  203.652315]  sock_ioctl+0x27b/0x4f0
[  203.653058]  __x64_sys_ioctl+0x124/0x190
[  203.653850]  do_syscall_64+0x35/0x80
[  203.654608]  entry_SYSCALL_64_after_hwframe+0x44/0xae

[  203.666952] The buggy address belongs to the object at ffff888144df2000
                which belongs to the cache kmalloc-256 of size 256
[  203.669250] The buggy address is located 80 bytes inside of
                256-byte region [ffff888144df2000, ffff888144df2100)
[  203.671332] The buggy address belongs to the page:
[  203.672273] page:00000000bf6c9314 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x144df0
[  203.674009] head:00000000bf6c9314 order:2 compound_mapcount:0 compound_pincount:0
[  203.675422] flags: 0x2ffff800010200(slab|head|node=0|zone=2|lastcpupid=0x1ffff)
[  203.676819] raw: 002ffff800010200 0000000000000000 dead000000000122 ffff888100042b40
[  203.678384] raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
[  203.679928] page dumped because: kasan: bad access detected

[  203.681455] Memory state around the buggy address:
[  203.682421]  ffff888144df1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  203.683863]  ffff888144df1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  203.685310] >ffff888144df2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  203.686701]                                                  ^
[  203.687820]  ffff888144df2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  203.689226]  ffff888144df2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  203.690620] ==================================================================

Fixes: ad11c4f1d8 ("net/mlx5e: Lag, Only handle events from highest priority multipath entry")
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
2022-05-04 00:00:03 -07:00
arch Pin control fixes for v5.18: 2022-04-26 16:34:11 -07:00
block block: don't print I/O error warning for dead disks 2022-04-15 06:33:03 -06:00
certs Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
crypto for-5.18/64bit-pi-2022-03-25 2022-03-26 12:01:35 -07:00
Documentation Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf 2022-04-28 12:34:50 -07:00
drivers net/mlx5e: Lag, Fix use-after-free in fib event handler 2022-05-04 00:00:03 -07:00
fs gfs2 fix 2022-04-28 09:50:29 -07:00
include net: stmmac: disable Split Header (SPH) for Intel platforms 2022-05-01 13:20:03 +01:00
init Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
ipc fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
kernel Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf 2022-04-28 12:34:50 -07:00
lib hex2bin: fix access beyond string end 2022-04-27 10:57:33 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm kasan: prevent cpu_quarantine corruption when CPU offline and cache shrink occur at same time 2022-04-27 13:28:48 -07:00
net net: rds: acquire refcount on TCP sockets 2022-05-03 13:22:50 +02:00
samples dma-mapping updates for Linux 5.18 2022-03-29 08:50:14 -07:00
scripts hardening fixes for v5.18-rc3 2022-04-12 14:29:40 -10:00
security hardening updates for v5.18-rc1-fix1 2022-03-31 11:43:01 -07:00
sound ALSA: hda/realtek: Add quirk for Clevo NP70PNP 2022-04-21 21:23:47 +02:00
tools selftests/net: so_txtime: usage(): fix documentation of default clock 2022-05-03 13:18:26 +02:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: SEV: add cache flush to solve SEV cache incoherency issues 2022-04-21 15:41:00 -04:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update Vasily Averin's email address 2022-04-08 14:20:36 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf 2022-04-28 12:34:50 -07:00
Makefile Linux 5.18-rc4 2022-04-24 14:51:22 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
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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.