From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, YueHaibing <yuehaibing@huawei.com>,
Hulk Robot <hulkci@huawei.com>, Kees Cook <keescook@chromium.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Al Viro <viro@zeniv.linux.org.uk>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.0 06/89] fs/proc/proc_sysctl.c: Fix a NULL pointer dereference
Date: Tue, 30 Apr 2019 13:37:57 +0200 [thread overview]
Message-ID: <20190430113610.084543897@linuxfoundation.org> (raw)
In-Reply-To: <20190430113609.741196396@linuxfoundation.org>
[ Upstream commit 89189557b47b35683a27c80ee78aef18248eefb4 ]
Syzkaller report this:
sysctl could not get directory: /net//bridge -12
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN PTI
CPU: 1 PID: 7027 Comm: syz-executor.0 Tainted: G C 5.1.0-rc3+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
RIP: 0010:__write_once_size include/linux/compiler.h:220 [inline]
RIP: 0010:__rb_change_child include/linux/rbtree_augmented.h:144 [inline]
RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:186 [inline]
RIP: 0010:rb_erase+0x5f4/0x19f0 lib/rbtree.c:459
Code: 00 0f 85 60 13 00 00 48 89 1a 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 75 0c 00 00 4d 85 ed 4c 89 2e 74 ce 4c 89 ea 48
RSP: 0018:ffff8881bb507778 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8881f224b5b8 RCX: ffffffff818f3f6a
RDX: 000000000000000a RSI: 0000000000000050 RDI: ffff8881f224b568
RBP: 0000000000000000 R08: ffffed10376a0ef4 R09: ffffed10376a0ef4
R10: 0000000000000001 R11: ffffed10376a0ef4 R12: ffff8881f224b558
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f3e7ce13700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd60fbe9398 CR3: 00000001cb55c001 CR4: 00000000007606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
erase_entry fs/proc/proc_sysctl.c:178 [inline]
erase_header+0xe3/0x160 fs/proc/proc_sysctl.c:207
start_unregistering fs/proc/proc_sysctl.c:331 [inline]
drop_sysctl_table+0x558/0x880 fs/proc/proc_sysctl.c:1631
get_subdir fs/proc/proc_sysctl.c:1022 [inline]
__register_sysctl_table+0xd65/0x1090 fs/proc/proc_sysctl.c:1335
br_netfilter_init+0x68/0x1000 [br_netfilter]
do_one_initcall+0xbc/0x47d init/main.c:901
do_init_module+0x1b5/0x547 kernel/module.c:3456
load_module+0x6405/0x8c10 kernel/module.c:3804
__do_sys_finit_module+0x162/0x190 kernel/module.c:3898
do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Modules linked in: br_netfilter(+) backlight comedi(C) hid_sensor_hub max3100 ti_ads8688 udc_core fddi snd_mona leds_gpio rc_streamzap mtd pata_netcell nf_log_common rc_winfast udp_tunnel snd_usbmidi_lib snd_usb_toneport snd_usb_line6 snd_rawmidi snd_seq_device snd_hwdep videobuf2_v4l2 videobuf2_common videodev media videobuf2_vmalloc videobuf2_memops rc_gadmei_rm008z 8250_of smm665 hid_tmff hid_saitek hwmon_vid rc_ati_tv_wonder_hd_600 rc_core pata_pdc202xx_old dn_rtmsg as3722 ad714x_i2c ad714x snd_soc_cs4265 hid_kensington panel_ilitek_ili9322 drm drm_panel_orientation_quirks ipack cdc_phonet usbcore phonet hid_jabra hid extcon_arizona can_dev industrialio_triggered_buffer kfifo_buf industrialio adm1031 i2c_mux_ltc4306 i2c_mux ipmi_msghandler mlxsw_core snd_soc_cs35l34 snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer ac97_bus snd_compress snd soundcore gpio_da9055 uio ecdh_generic mdio_thunder of_mdio fixed_phy libphy mdio_cavium iptable_security iptable_raw iptable_mangle
iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_filter bpfilter ip6_vti ip_vti ip_gre ipip sit tunnel4 ip_tunnel hsr veth netdevsim vxcan batman_adv cfg80211 rfkill chnl_net caif nlmon dummy team bonding vcan bridge stp llc ip6_gre gre ip6_tunnel tunnel6 tun joydev mousedev ppdev tpm kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel ide_pci_generic piix aes_x86_64 crypto_simd cryptd ide_core glue_helper input_leds psmouse intel_agp intel_gtt serio_raw ata_generic i2c_piix4 agpgart pata_acpi parport_pc parport floppy rtc_cmos sch_fq_codel ip_tables x_tables sha1_ssse3 sha1_generic ipv6 [last unloaded: br_netfilter]
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 68741688d5fbfe85 ]---
commit 23da9588037e ("fs/proc/proc_sysctl.c: fix NULL pointer
dereference in put_links") forgot to handle start_unregistering() case,
while header->parent is NULL, it calls erase_header() and as seen in the
above syzkaller call trace, accessing &header->parent->root will trigger
a NULL pointer dereference.
As that commit explained, there is also no need to call
start_unregistering() if header->parent is NULL.
Link: http://lkml.kernel.org/r/20190409153622.28112-1-yuehaibing@huawei.com
Fixes: 23da9588037e ("fs/proc/proc_sysctl.c: fix NULL pointer dereference in put_links")
Fixes: 0e47c99d7fe25 ("sysctl: Replace root_list with links between sysctl_table_sets")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/proc/proc_sysctl.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index d65390727541..7325baa8f9d4 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1626,9 +1626,11 @@ static void drop_sysctl_table(struct ctl_table_header *header)
if (--header->nreg)
return;
- if (parent)
+ if (parent) {
put_links(header);
- start_unregistering(header);
+ start_unregistering(header);
+ }
+
if (!--header->count)
kfree_rcu(header, rcu);
--
2.19.1
next prev parent reply other threads:[~2019-04-30 11:48 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 11:37 [PATCH 5.0 00/89] 5.0.11-stable review Greg Kroah-Hartman
2019-04-30 11:37 ` [PATCH 5.0 01/89] netfilter: nf_tables: bogus EBUSY when deleting set after flush Greg Kroah-Hartman
2019-04-30 11:37 ` [PATCH 5.0 02/89] netfilter: nf_tables: bogus EBUSY in helper removal from transaction Greg Kroah-Hartman
2019-04-30 11:37 ` [PATCH 5.0 03/89] intel_th: gth: Fix an off-by-one in output unassigning Greg Kroah-Hartman
2019-04-30 11:37 ` [PATCH 5.0 04/89] powerpc/vdso32: fix CLOCK_MONOTONIC on PPC64 Greg Kroah-Hartman
2019-04-30 11:37 ` [PATCH 5.0 05/89] ALSA: hda/realtek - Move to ACT_INIT state Greg Kroah-Hartman
2019-04-30 11:37 ` Greg Kroah-Hartman [this message]
2019-04-30 11:37 ` [PATCH 5.0 07/89] block, bfq: fix use after free in bfq_bfqq_expire Greg Kroah-Hartman
2019-04-30 11:37 ` [PATCH 5.0 08/89] cifs: fix memory leak in SMB2_read Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 09/89] cifs: fix page reference leak with readv/writev Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 10/89] cifs: do not attempt cifs operation on smb2+ rename error Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 11/89] tracing: Fix a memory leak by early error exit in trace_pid_write() Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 12/89] tracing: Fix buffer_ref pipe ops Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 13/89] crypto: xts - Fix atomic sleep when walking skcipher Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 14/89] crypto: lrw " Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 15/89] gpio: eic: sprd: Fix incorrect irq type setting for the sync EIC Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 16/89] zram: pass down the bvec we need to read into in the work struct Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 17/89] lib/Kconfig.debug: fix build error without CONFIG_BLOCK Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 18/89] MIPS: scall64-o32: Fix indirect syscall number load Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 19/89] trace: Fix preempt_enable_no_resched() abuse Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 20/89] mm: do not boost watermarks to avoid fragmentation for the DISCONTIG memory model Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 21/89] arm64: mm: Ensure tail of unaligned initrd is reserved Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 22/89] IB/rdmavt: Fix frwr memory registration Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 23/89] RDMA/mlx5: Do not allow the user to write to the clock page Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 24/89] RDMA/mlx5: Use rdma_user_map_io for mapping BAR pages Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 25/89] RDMA/ucontext: Fix regression with disassociate Greg Kroah-Hartman
2019-05-03 11:47 ` Michal Kubecek
2019-05-03 11:48 ` Michal Kubecek
2019-04-30 11:38 ` [PATCH 5.0 26/89] sched/numa: Fix a possible divide-by-zero Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 27/89] ceph: only use d_name directly when parent is locked Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 28/89] ceph: ensure d_name stability in ceph_dentry_hash() Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 29/89] ceph: fix ci->i_head_snapc leak Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 30/89] nfsd: Dont release the callback slot unless it was actually held Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 31/89] nfsd: wake waiters blocked on file_lock before deleting it Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 32/89] nfsd: wake blocked file lock waiters before sending callback Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 33/89] sunrpc: dont mark uninitialised items as VALID Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 34/89] perf/x86/intel: Update KBL Package C-state events to also include PC8/PC9/PC10 counters Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 35/89] Input: synaptics-rmi4 - write config register values to the right offset Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 36/89] vfio/type1: Limit DMA mappings per container Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 37/89] dmaengine: sh: rcar-dmac: With cyclic DMA residue 0 is valid Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 38/89] dmaengine: sh: rcar-dmac: Fix glitch in dmaengine_tx_status Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 39/89] dmaengine: mediatek-cqdma: fix wrong register usage in mtk_cqdma_start Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 40/89] ARM: 8857/1: efi: enable CP15 DMB instructions before cleaning the cache Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 41/89] powerpc/mm/radix: Make Radix require HUGETLB_PAGE Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 42/89] drm/vc4: Fix memory leak during gpu reset Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 43/89] drm/ttm: fix re-init of global structures Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 44/89] Revert "drm/i915/fbdev: Actually configure untiled displays" Greg Kroah-Hartman
2019-05-01 13:02 ` Sasha Levin
2019-05-01 13:06 ` Sasha Levin
2019-05-01 13:08 ` Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 45/89] drm/vc4: Fix compilation error reported by kbuild test bot Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 46/89] USB: Add new USB LPM helpers Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 47/89] USB: Consolidate LPM checks to avoid enabling LPM twice Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 48/89] ext4: fix some error pointer dereferences Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 49/89] loop: do not print warn message if partition scan is successful Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 50/89] tipc: handle the err returned from cmd header function Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 51/89] slip: make slhc_free() silently accept an error pointer Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 52/89] workqueue: Try to catch flush_work() without INIT_WORK() Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 53/89] binder: fix handling of misaligned binder object Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 54/89] sched/deadline: Correctly handle active 0-lag timers Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 55/89] mac80211_hwsim: calculate if_combination.max_interfaces Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 56/89] NFS: Forbid setting AF_INET6 to "struct sockaddr_in"->sin_family Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 57/89] netfilter: ebtables: CONFIG_COMPAT: drop a bogus WARN_ON Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 58/89] fm10k: Fix a potential NULL pointer dereference Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 59/89] tipc: check bearer name with right length in tipc_nl_compat_bearer_enable Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 60/89] tipc: check link name with right length in tipc_nl_compat_link_set Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 61/89] net: netrom: Fix error cleanup path of nr_proto_init Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 62/89] net/rds: Check address length before reading address family Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 63/89] rxrpc: fix race condition in rxrpc_input_packet() Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 64/89] pin iocb through aio Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 65/89] aio: fold lookup_kiocb() into its sole caller Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 66/89] aio: keep io_event in aio_kiocb Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 67/89] aio: store event at final iocb_put() Greg Kroah-Hartman
2019-04-30 11:38 ` [PATCH 5.0 68/89] Fix aio_poll() races Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 69/89] x86, retpolines: Raise limit for generating indirect calls from switch-case Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 70/89] x86/retpolines: Disable switch jump tables when retpolines are enabled Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 71/89] rdma: fix build errors on s390 and MIPS due to bad ZERO_PAGE use Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 72/89] ipv4: add sanity checks in ipv4_link_failure() Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 73/89] ipv4: set the tcp_min_rtt_wlen range from 0 to one day Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 74/89] mlxsw: spectrum: Fix autoneg status in ethtool Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 75/89] net/mlx5e: ethtool, Remove unsupported SFP EEPROM high pages query Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 76/89] net: rds: exchange of 8K and 1M pool Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 77/89] net/rose: fix unbound loop in rose_loopback_timer() Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 78/89] net: stmmac: move stmmac_check_ether_addr() to driver probe Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 79/89] net/tls: fix refcount adjustment in fallback Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 80/89] stmmac: pci: Adjust IOT2000 matching Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 81/89] team: fix possible recursive locking when add slaves Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 82/89] net: socionext: replace napi_alloc_frag with the netdev variant on init Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 83/89] net/ncsi: handle overflow when incrementing mac address Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 84/89] mlxsw: pci: Reincrease PCI reset timeout Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 85/89] mlxsw: spectrum: Put MC TCs into DWRR mode Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 86/89] net/mlx5e: Fix the max MTU check in case of XDP Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 87/89] net/mlx5e: Fix use-after-free after xdp_return_frame Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 88/89] net/tls: avoid potential deadlock in tls_set_device_offload_rx() Greg Kroah-Hartman
2019-04-30 11:39 ` [PATCH 5.0 89/89] net/tls: dont leak IV and record seq when offload fails Greg Kroah-Hartman
2019-04-30 17:06 ` [PATCH 5.0 00/89] 5.0.11-stable review kernelci.org bot
2019-04-30 22:33 ` shuah
2019-05-01 7:55 ` Greg Kroah-Hartman
2019-05-01 6:21 ` Naresh Kamboju
2019-05-01 7:55 ` Greg Kroah-Hartman
2019-05-01 8:26 ` Jon Hunter
2019-05-01 8:43 ` Greg Kroah-Hartman
2019-05-01 16:44 ` Guenter Roeck
2019-05-01 17:14 ` Greg Kroah-Hartman
2019-05-02 5:30 ` Bharath Vedartham
2019-05-02 6:44 ` Greg Kroah-Hartman
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