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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Liang Chen <liangchen.linux@gmail.com>,
	Coly Li <colyli@suse.de>, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4.19 079/105] bcache: fix a race between cache register and cacheset unregister
Date: Mon, 20 May 2019 14:14:25 +0200
Message-ID: <20190520115252.726150063@linuxfoundation.org> (raw)
In-Reply-To: <20190520115247.060821231@linuxfoundation.org>

From: Liang Chen <liangchen.linux@gmail.com>

commit a4b732a248d12cbdb46999daf0bf288c011335eb upstream.

There is a race between cache device register and cache set unregister.
For an already registered cache device, register_bcache will call
bch_is_open to iterate through all cachesets and check every cache
there. The race occurs if cache_set_free executes at the same time and
clears the caches right before ca is dereferenced in bch_is_open_cache.
To close the race, let's make sure the clean up work is protected by
the bch_register_lock as well.

This issue can be reproduced as follows,
while true; do echo /dev/XXX> /sys/fs/bcache/register ; done&
while true; do echo 1> /sys/block/XXX/bcache/set/unregister ; done &

and results in the following oops,

[  +0.000053] BUG: unable to handle kernel NULL pointer dereference at 0000000000000998
[  +0.000457] #PF error: [normal kernel read fault]
[  +0.000464] PGD 800000003ca9d067 P4D 800000003ca9d067 PUD 3ca9c067 PMD 0
[  +0.000388] Oops: 0000 [#1] SMP PTI
[  +0.000269] CPU: 1 PID: 3266 Comm: bash Not tainted 5.0.0+ #6
[  +0.000346] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.fc28 04/01/2014
[  +0.000472] RIP: 0010:register_bcache+0x1829/0x1990 [bcache]
[  +0.000344] Code: b0 48 83 e8 50 48 81 fa e0 e1 10 c0 0f 84 a9 00 00 00 48 89 c6 48 89 ca 0f b7 ba 54 04 00 00 4c 8b 82 60 0c 00 00 85 ff 74 2f <49> 3b a8 98 09 00 00 74 4e 44 8d 47 ff 31 ff 49 c1 e0 03 eb 0d
[  +0.000839] RSP: 0018:ffff92ee804cbd88 EFLAGS: 00010202
[  +0.000328] RAX: ffffffffc010e190 RBX: ffff918b5c6b5000 RCX: ffff918b7d8e0000
[  +0.000399] RDX: ffff918b7d8e0000 RSI: ffffffffc010e190 RDI: 0000000000000001
[  +0.000398] RBP: ffff918b7d318340 R08: 0000000000000000 R09: ffffffffb9bd2d7a
[  +0.000385] R10: ffff918b7eb253c0 R11: ffffb95980f51200 R12: ffffffffc010e1a0
[  +0.000411] R13: fffffffffffffff2 R14: 000000000000000b R15: ffff918b7e232620
[  +0.000384] FS:  00007f955bec2740(0000) GS:ffff918b7eb00000(0000) knlGS:0000000000000000
[  +0.000420] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  +0.000801] CR2: 0000000000000998 CR3: 000000003cad6000 CR4: 00000000001406e0
[  +0.000837] Call Trace:
[  +0.000682]  ? _cond_resched+0x10/0x20
[  +0.000691]  ? __kmalloc+0x131/0x1b0
[  +0.000710]  kernfs_fop_write+0xfa/0x170
[  +0.000733]  __vfs_write+0x2e/0x190
[  +0.000688]  ? inode_security+0x10/0x30
[  +0.000698]  ? selinux_file_permission+0xd2/0x120
[  +0.000752]  ? security_file_permission+0x2b/0x100
[  +0.000753]  vfs_write+0xa8/0x1a0
[  +0.000676]  ksys_write+0x4d/0xb0
[  +0.000699]  do_syscall_64+0x3a/0xf0
[  +0.000692]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/bcache/super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1511,6 +1511,7 @@ static void cache_set_free(struct closur
 	bch_btree_cache_free(c);
 	bch_journal_free(c);
 
+	mutex_lock(&bch_register_lock);
 	for_each_cache(ca, c, i)
 		if (ca) {
 			ca->set = NULL;
@@ -1529,7 +1530,6 @@ static void cache_set_free(struct closur
 	mempool_exit(&c->search);
 	kfree(c->devices);
 
-	mutex_lock(&bch_register_lock);
 	list_del(&c->list);
 	mutex_unlock(&bch_register_lock);
 



  parent reply index

Thread overview: 131+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-20 12:13 [PATCH 4.19 000/105] 4.19.45-stable review Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 001/105] locking/rwsem: Prevent decrement of reader count before increment Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 002/105] x86/speculation/mds: Revert CPU buffer clear on double fault exit Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 003/105] x86/speculation/mds: Improve CPU buffer clear documentation Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 004/105] objtool: Fix function fallthrough detection Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 005/105] arm64: dts: rockchip: Disable DCMDs on RK3399s eMMC controller Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 006/105] ARM: dts: exynos: Fix interrupt for shared EINTs on Exynos5260 Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 007/105] ARM: dts: exynos: Fix audio (microphone) routing on Odroid XU3 Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 008/105] mmc: sdhci-of-arasan: Add DTS property to disable DCMDs Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 009/105] ARM: exynos: Fix a leaked reference by adding missing of_node_put Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 010/105] power: supply: axp288_charger: Fix unchecked return value Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 011/105] power: supply: axp288_fuel_gauge: Add ACEPC T8 and T11 mini PCs to the blacklist Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 012/105] arm64: mmap: Ensure file offset is treated as unsigned Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 013/105] arm64: arch_timer: Ensure counter register reads occur with seqlock held Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 014/105] arm64: compat: Reduce address limit Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 015/105] arm64: Clear OSDLR_EL1 on CPU boot Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 016/105] arm64: Save and restore OSDLR_EL1 across suspend/resume Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 017/105] sched/x86: Save [ER]FLAGS on context switch Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 018/105] crypto: crypto4xx - fix ctr-aes missing output IV Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 019/105] crypto: crypto4xx - fix cfb and ofb "overran dst buffer" issues Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 020/105] crypto: salsa20 - dont access already-freed walk.iv Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 021/105] crypto: chacha20poly1305 - set cra_name correctly Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 022/105] crypto: ccp - Do not free psp_master when PLATFORM_INIT fails Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 023/105] crypto: vmx - fix copy-paste error in CTR mode Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 024/105] crypto: skcipher - dont WARN on unprocessed data after slow walk step Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 025/105] crypto: crct10dif-generic - fix use via crypto_shash_digest() Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 026/105] crypto: x86/crct10dif-pcl " Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 027/105] crypto: arm64/gcm-aes-ce - fix no-NEON fallback code Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 028/105] crypto: gcm - fix incompatibility between "gcm" and "gcm_base" Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 029/105] crypto: rockchip - update IV buffer to contain the next IV Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 030/105] crypto: arm/aes-neonbs - dont access already-freed walk.iv Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 031/105] crypto: arm64/aes-neonbs " Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 032/105] mmc: core: Fix tag set memory leak Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 033/105] ALSA: line6: toneport: Fix broken usage of timer for delayed execution Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 034/105] ALSA: usb-audio: Fix a memory leak bug Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 035/105] ALSA: hda/hdmi - Read the pin sense from register when repolling Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 036/105] ALSA: hda/hdmi - Consider eld_valid when reporting jack event Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 037/105] ALSA: hda/realtek - EAPD turn on later Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 038/105] ALSA: hdea/realtek - Headset fixup for System76 Gazelle (gaze14) Greg Kroah-Hartman
2019-05-22  9:15   ` Pavel Machek
2019-05-22 10:22     ` Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 039/105] ASoC: max98090: Fix restore of DAPM Muxes Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 040/105] ASoC: RT5677-SPI: Disable 16Bit SPI Transfers Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 041/105] ASoC: fsl_esai: Fix missing break in switch statement Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 042/105] ASoC: codec: hdac_hdmi add device_link to card device Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 043/105] bpf, arm64: remove prefetch insn in xadd mapping Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 044/105] crypto: ccree - remove special handling of chained sg Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 045/105] crypto: ccree - fix mem leak on error path Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 046/105] crypto: ccree - dont map MAC key on stack Greg Kroah-Hartman
2019-05-22  8:49   ` Pavel Machek
2019-05-20 12:13 ` [PATCH 4.19 047/105] crypto: ccree - use correct internal state sizes for export Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 048/105] crypto: ccree - dont map AEAD key and IV on stack Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 049/105] crypto: ccree - pm resume first enable the source clk Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 050/105] crypto: ccree - HOST_POWER_DOWN_EN should be the last CC access during suspend Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 051/105] crypto: ccree - add function to handle cryptocell tee fips error Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 052/105] crypto: ccree - handle tee fips error during power management resume Greg Kroah-Hartman
2019-05-20 12:13 ` [PATCH 4.19 053/105] mm/mincore.c: make mincore() more conservative Greg Kroah-Hartman
2019-05-22  8:57   ` Pavel Machek
2019-05-22  9:21     ` Michal Hocko
2019-05-23  9:18       ` Kevin Easton
2019-05-20 12:14 ` [PATCH 4.19 054/105] mm/huge_memory: fix vmf_insert_pfn_{pmd, pud}() crash, handle unaligned addresses Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 055/105] mm/hugetlb.c: dont put_page in lock of hugetlb_lock Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 056/105] hugetlb: use same fault hash key for shared and private mappings Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 057/105] ocfs2: fix ocfs2 read inode data panic in ocfs2_iget Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 058/105] userfaultfd: use RCU to free the task struct when fork fails Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 059/105] ACPI: PM: Set enable_for_wake for wakeup GPEs during suspend-to-idle Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 060/105] mfd: da9063: Fix OTP control register names to match datasheets for DA9063/63L Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 061/105] mfd: max77620: Fix swapped FPS_PERIOD_MAX_US values Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 062/105] mtd: spi-nor: intel-spi: Avoid crossing 4K address boundary on read/write Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 063/105] tty: vt.c: Fix TIOCL_BLANKSCREEN console blanking if blankinterval == 0 Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 064/105] tty/vt: fix write/write race in ioctl(KDSKBSENT) handler Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 065/105] jbd2: check superblock mapped prior to committing Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 066/105] ext4: make sanity check in mballoc more strict Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 067/105] ext4: protect journal inodes blocks using block_validity Greg Kroah-Hartman
2019-05-22  9:18   ` Pavel Machek
2019-05-22 10:21     ` Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 068/105] ext4: ignore e_value_offs for xattrs with value-in-ea-inode Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 069/105] ext4: avoid drop reference to iloc.bh twice Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 070/105] ext4: fix use-after-free race with debug_want_extra_isize Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 071/105] ext4: actually request zeroing of inode table after grow Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 072/105] ext4: fix ext4_show_options for file systems w/o journal Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 073/105] btrfs: Check the first key and level for cached extent buffer Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 074/105] btrfs: Correctly free extent buffer in case btree_read_extent_buffer_pages fails Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 075/105] btrfs: Honour FITRIM range constraints during free space trim Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 076/105] Btrfs: send, flush dellaloc in order to avoid data loss Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 077/105] Btrfs: do not start a transaction during fiemap Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 078/105] Btrfs: do not start a transaction at iterate_extent_inodes() Greg Kroah-Hartman
2019-05-20 12:14 ` Greg Kroah-Hartman [this message]
2019-05-20 12:14 ` [PATCH 4.19 080/105] bcache: never set KEY_PTRS of journal key to 0 in journal_reclaim() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 081/105] ipmi:ssif: compare block number correctly for multi-part return messages Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 082/105] crypto: ccm - fix incompatibility between "ccm" and "ccm_base" Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 083/105] fs/writeback.c: use rcu_barrier() to wait for inflight wb switches going into workqueue when umount Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 084/105] tty: Dont force RISCV SBI console as preferred console Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 085/105] ext4: zero out the unused memory region in the extent tree block Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 086/105] ext4: fix data corruption caused by overlapping unaligned and aligned IO Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 087/105] ext4: fix use-after-free in dx_release() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 088/105] ext4: avoid panic during forced reboot due to aborted journal Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 089/105] ALSA: hda/realtek - Corrected fixup for System76 Gazelle (gaze14) Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 090/105] ALSA: hda/realtek - Fixup headphone noise via runtime suspend Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 091/105] ALSA: hda/realtek - Fix for Lenovo B50-70 inverted internal microphone bug Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 092/105] jbd2: fix potential double free Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 093/105] KVM: x86: Skip EFER vs. guest CPUID checks for host-initiated writes Greg Kroah-Hartman
2019-05-22 11:20   ` Pavel Machek
2019-05-20 12:14 ` [PATCH 4.19 094/105] KVM: lapic: Busy wait for timer to expire when using hv_timer Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 095/105] kbuild: turn auto.conf.cmd into a mandatory include file Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 096/105] xen/pvh: set xen_domain_type to HVM in xen_pvh_init Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 097/105] libnvdimm/namespace: Fix label tracking error Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 098/105] iov_iter: optimize page_copy_sane() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 099/105] pstore: Centralize init/exit routines Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 100/105] pstore: Allocate compression during late_initcall() Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 101/105] pstore: Refactor compression initialization Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 102/105] ext4: unsigned int compared against zero Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 103/105] ext4: fix block validity checks for journal inodes using indirect blocks Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 104/105] ext4: fix compile error when using BUFFER_TRACE Greg Kroah-Hartman
2019-05-20 12:14 ` [PATCH 4.19 105/105] ext4: dont update s_rev_level if not required Greg Kroah-Hartman
2019-05-20 17:48 ` [PATCH 4.19 000/105] 4.19.45-stable review kernelci.org bot
2019-05-20 22:23 ` Dan Rue
2019-05-21  8:59   ` Greg Kroah-Hartman
2019-05-21  9:28     ` Naresh Kamboju
2019-05-21  9:38       ` ext4 regression (was Re: [PATCH 4.19 000/105] 4.19.45-stable review) Greg Kroah-Hartman
2019-05-21 10:28         ` Naresh Kamboju
2019-05-21 16:21           ` Theodore Ts'o
2019-05-21 16:30             ` Greg Kroah-Hartman
2019-05-21 16:44               ` Greg Kroah-Hartman
2019-05-21 17:57             ` Naresh Kamboju
2019-05-22  5:05               ` Theodore Ts'o
2019-05-22 10:20                 ` Naresh Kamboju
2019-05-21 15:02         ` Dan Rue
2019-05-21  8:51 ` [PATCH 4.19 000/105] 4.19.45-stable review Jon Hunter
2019-05-21 21:31 ` shuah
2019-05-22  5:04 ` Naresh Kamboju

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