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Juhee Kang e7f2742068 net: hsr: fix suspicious RCU usage warning in hsr_node_get_first() 
When hsr_create_self_node() calls hsr_node_get_first(), the suspicious
RCU usage warning is occurred. The reason why this warning is raised is
the callers of hsr_node_get_first() use rcu_read_lock_bh() and
other different synchronization mechanisms. Thus, this patch solved by
replacing rcu_dereference() with rcu_dereference_bh_check().

The kernel test robot reports:
    [   50.083470][ T3596] =============================
    [   50.088648][ T3596] WARNING: suspicious RCU usage
    [   50.093785][ T3596] 5.17.0-rc3-next-20220208-syzkaller #0 Not tainted
    [   50.100669][ T3596] -----------------------------
    [   50.105513][ T3596] net/hsr/hsr_framereg.c:34 suspicious rcu_dereference_check() usage!
    [   50.113799][ T3596]
    [   50.113799][ T3596] other info that might help us debug this:
    [   50.113799][ T3596]
    [   50.124257][ T3596]
    [   50.124257][ T3596] rcu_scheduler_active = 2, debug_locks = 1
    [   50.132368][ T3596] 2 locks held by syz-executor.0/3596:
    [   50.137863][ T3596]  #0: ffffffff8d3357e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80
    [   50.147470][ T3596]  #1: ffff88807ec9d5f0 (&hsr->list_lock){+...}-{2:2}, at: hsr_create_self_node+0x225/0x650
    [   50.157623][ T3596]
    [   50.157623][ T3596] stack backtrace:
    [   50.163510][ T3596] CPU: 1 PID: 3596 Comm: syz-executor.0 Not tainted 5.17.0-rc3-next-20220208-syzkaller #0
    [   50.173381][ T3596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    [   50.183623][ T3596] Call Trace:
    [   50.186904][ T3596]  <TASK>
    [   50.189844][ T3596]  dump_stack_lvl+0xcd/0x134
    [   50.194640][ T3596]  hsr_node_get_first+0x9b/0xb0
    [   50.199499][ T3596]  hsr_create_self_node+0x22d/0x650
    [   50.204688][ T3596]  hsr_dev_finalize+0x2c1/0x7d0
    [   50.209669][ T3596]  hsr_newlink+0x315/0x730
    [   50.214113][ T3596]  ? hsr_dellink+0x130/0x130
    [   50.218789][ T3596]  ? rtnl_create_link+0x7e8/0xc00
    [   50.223803][ T3596]  ? hsr_dellink+0x130/0x130
    [   50.228397][ T3596]  __rtnl_newlink+0x107c/0x1760
    [   50.233249][ T3596]  ? rtnl_setlink+0x3c0/0x3c0
    [   50.238043][ T3596]  ? is_bpf_text_address+0x77/0x170
    [   50.243362][ T3596]  ? lock_downgrade+0x6e0/0x6e0
    [   50.248219][ T3596]  ? unwind_next_frame+0xee1/0x1ce0
    [   50.253605][ T3596]  ? entry_SYSCALL_64_after_hwframe+0x44/0xae
    [   50.259669][ T3596]  ? __sanitizer_cov_trace_cmp4+0x1c/0x70
    [   50.265423][ T3596]  ? is_bpf_text_address+0x99/0x170
    [   50.270819][ T3596]  ? kernel_text_address+0x39/0x80
    [   50.275950][ T3596]  ? __kernel_text_address+0x9/0x30
    [   50.281336][ T3596]  ? unwind_get_return_address+0x51/0x90
    [   50.286975][ T3596]  ? create_prof_cpu_mask+0x20/0x20
    [   50.292178][ T3596]  ? arch_stack_walk+0x93/0xe0
    [   50.297172][ T3596]  ? kmem_cache_alloc_trace+0x42/0x2c0
    [   50.302637][ T3596]  ? rcu_read_lock_sched_held+0x3a/0x70
    [   50.308194][ T3596]  rtnl_newlink+0x64/0xa0
    [   50.312524][ T3596]  ? __rtnl_newlink+0x1760/0x1760
    [   50.317545][ T3596]  rtnetlink_rcv_msg+0x413/0xb80
    [   50.322631][ T3596]  ? rtnl_newlink+0xa0/0xa0
    [   50.327159][ T3596]  netlink_rcv_skb+0x153/0x420
    [   50.331931][ T3596]  ? rtnl_newlink+0xa0/0xa0
    [   50.336436][ T3596]  ? netlink_ack+0xa80/0xa80
    [   50.341095][ T3596]  ? netlink_deliver_tap+0x1a2/0xc40
    [   50.346532][ T3596]  ? netlink_deliver_tap+0x1b1/0xc40
    [   50.351839][ T3596]  netlink_unicast+0x539/0x7e0
    [   50.356633][ T3596]  ? netlink_attachskb+0x880/0x880
    [   50.361750][ T3596]  ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70
    [   50.368003][ T3596]  ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70
    [   50.374707][ T3596]  ? __phys_addr_symbol+0x2c/0x70
    [   50.379753][ T3596]  ? __sanitizer_cov_trace_cmp8+0x1d/0x70
    [   50.385568][ T3596]  ? __check_object_size+0x16c/0x4f0
    [   50.390859][ T3596]  netlink_sendmsg+0x904/0xe00
    [   50.395715][ T3596]  ? netlink_unicast+0x7e0/0x7e0
    [   50.400722][ T3596]  ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70
    [   50.407003][ T3596]  ? netlink_unicast+0x7e0/0x7e0
    [   50.412119][ T3596]  sock_sendmsg+0xcf/0x120
    [   50.416548][ T3596]  __sys_sendto+0x21c/0x320
    [   50.421052][ T3596]  ? __ia32_sys_getpeername+0xb0/0xb0
    [   50.426427][ T3596]  ? lockdep_hardirqs_on_prepare+0x400/0x400
    [   50.432721][ T3596]  ? __context_tracking_exit+0xb8/0xe0
    [   50.438188][ T3596]  ? lock_downgrade+0x6e0/0x6e0
    [   50.443041][ T3596]  ? lock_downgrade+0x6e0/0x6e0
    [   50.447902][ T3596]  __x64_sys_sendto+0xdd/0x1b0
    [   50.452759][ T3596]  ? lockdep_hardirqs_on+0x79/0x100
    [   50.457964][ T3596]  ? syscall_enter_from_user_mode+0x21/0x70
    [   50.464150][ T3596]  do_syscall_64+0x35/0xb0
    [   50.468565][ T3596]  entry_SYSCALL_64_after_hwframe+0x44/0xae
    [   50.474452][ T3596] RIP: 0033:0x7f3148504e1c
    [   50.479052][ T3596] Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b
    [   50.498926][ T3596] RSP: 002b:00007ffeab5f2ab0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
    [   50.507342][ T3596] RAX: ffffffffffffffda RBX: 00007f314959d320 RCX: 00007f3148504e1c
    [   50.515393][ T3596] RDX: 0000000000000048 RSI: 00007f314959d370 RDI: 0000000000000003
    [   50.523444][ T3596] RBP: 0000000000000000 R08: 00007ffeab5f2b04 R09: 000000000000000c
    [   50.531492][ T3596] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
    [   50.539455][ T3596] R13: 00007f314959d370 R14: 0000000000000003 R15: 0000000000000000

Fixes: 4acc45db71 ("net: hsr: use hlist_head instead of list_head for mac addresses")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Reported-and-tested-by: syzbot+f0eb4f3876de066b128c@syzkaller.appspotmail.com
Signed-off-by: Juhee Kang <claudiajkang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-02-19 16:39:45 +00:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-03 21:09:24 -07:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: af_alg - get rid of alg_memory_allocated 2022-02-15 14:29:04 +00:00
Documentation dt-bindings: net: New binding mctp-i2c-controller 2022-02-19 16:18:49 +00:00
drivers atm: nicstar: Use kcalloc() to simplify code 2022-02-19 16:38:12 +00:00
fs fs/file_table: fix adding missing kmemleak_not_leak() 2022-02-17 10:23:19 -08:00
include net: ip6mr: add support for passing full packet on wrong mif 2022-02-19 16:05:54 +00:00
init Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-02-09 18:40:56 -08:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-02-17 17:23:52 -08:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-10 17:29:56 -08:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: don't try to NUMA-migrate COW pages that have other uses 2022-02-17 08:57:47 -08:00
net net: hsr: fix suspicious RCU usage warning in hsr_node_get_first() 2022-02-19 16:39:45 +00:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
scripts Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
security Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-10 17:29:56 -08:00
sound ASoC: Fixes for v5.17 2022-02-01 16:52:54 +01:00
tools selftests: mptcp: add csum mib check for mptcp_connect 2022-02-17 19:59:59 -08:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt Two larger x86 series: 2022-01-28 19:00:26 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.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 Christian Brauner's email address 2022-02-01 11:21:31 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
Makefile Linux 5.17-rc4 2022-02-13 12:13:30 -08:00
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.