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scoty755
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Nov 12, 2016
Fix a short sprintf buffer in proc_keys_show(). If the gcc stack protector is turned on, this can cause a panic due to stack corruption. The problem is that xbuf[] is not big enough to hold a 64-bit timeout rendered as weeks: (gdb) p 0xffffffffffffffffULL/(60*60*24*7) $2 = 30500568904943 That's 14 chars plus NUL, not 11 chars plus NUL. Expand the buffer to 16 chars. I think the unpatched code apparently works if the stack-protector is not enabled because on a 32-bit machine the buffer won't be overflowed and on a 64-bit machine there's a 64-bit aligned pointer at one side and an int that isn't checked again on the other side. The panic incurred looks something like: Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff81352ebe CPU: 0 PID: 1692 Comm: reproducer Not tainted 4.7.2-201.fc24.x86_64 #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 0000000000000086 00000000fbbd2679 ffff8800a044bc00 ffffffff813d941f ffffffff81a28d58 ffff8800a044bc98 ffff8800a044bc88 ffffffff811b2cb6 ffff880000000010 ffff8800a044bc98 ffff8800a044bc30 00000000fbbd2679 Call Trace: [<ffffffff813d941f>] dump_stack+0x63/0x84 [<ffffffff811b2cb6>] panic+0xde/0x22a [<ffffffff81352ebe>] ? proc_keys_show+0x3ce/0x3d0 [<ffffffff8109f7f9>] __stack_chk_fail+0x19/0x30 [<ffffffff81352ebe>] proc_keys_show+0x3ce/0x3d0 [<ffffffff81350410>] ? key_validate+0x50/0x50 [<ffffffff8134db30>] ? key_default_cmp+0x20/0x20 [<ffffffff8126b31c>] seq_read+0x2cc/0x390 [<ffffffff812b6b12>] proc_reg_read+0x42/0x70 [<ffffffff81244fc7>] __vfs_read+0x37/0x150 [<ffffffff81357020>] ? security_file_permission+0xa0/0xc0 [<ffffffff81246156>] vfs_read+0x96/0x130 [<ffffffff81247635>] SyS_read+0x55/0xc0 [<ffffffff817eb872>] entry_SYSCALL_64_fastpath+0x1a/0xa4 Change-Id: I0787d5a38c730ecb75d3c08f28f0ab36295d59e7 Reported-by: Ondrej Kozina <okozina@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Ondrej Kozina <okozina@redhat.com>
scoty755
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Nov 12, 2016
Implement Samsung's FMODE_NONMAPPABLE flag from sdcardfs version 2.1.4 as we hit a BUG on ext4: [ 49.655037]@0 Kernel BUG at ffffffc0001deeec [verbose debug info unavailable] [ 49.655045]@0 Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 49.655052]@0 Modules linked in: [ 49.655061]@0 CPU: 0 PID: 283 Comm: kworker/u8:7 Tainted: G W 3.18.20-perf-g3be2054-00086-ga8307fb #1 [ 49.655070]@0 Hardware name: Qualcomm Technologies, Inc. MSM 8996 v3 + PMI8996 MTP (DT) [ 49.655077]@0 Workqueue: writeback bdi_writeback_workfn (flush-8:0) [ 49.655096]@0 task: ffffffc174ba8b00 ti: ffffffc174bb4000 task.ti: ffffffc174bb4000 [ 49.655108]@0 PC is at mpage_prepare_extent_to_map+0x198/0x218 [ 49.655116]@0 LR is at mpage_prepare_extent_to_map+0x110/0x218 [ 49.655121]@0 pc : [<ffffffc0001deeec>] lr : [<ffffffc0001dee64>] pstate: 60000145 [ 49.655126]@0 sp : ffffffc174bb7800 [ 49.655130]@0 x29: ffffffc174bb7800 x28: ffffffc174bb7880 [ 49.655140]@0 x27: 000000000000000d x26: ffffffc1245505e8 [ 49.655149]@0 x25: 0000000000000000 x24: 0000000000003400 [ 49.655160]@0 x23: ffffffffffffffff x22: 0000000000000000 [ 49.655172]@0 x21: ffffffc174bb7888 x20: ffffffc174bb79e0 [ 49.655182]@0 x19: ffffffbdc4ee7b80 x18: 0000007f92872000 [ 49.655191]@0 x17: 0000007f959b6424 x16: ffffffc00016d1ac [ 49.655201]@0 x15: 0000007f9285d158 x14: ffffffc1734796e8 [ 49.655210]@0 x13: ffffffbdc1ffa4c0 x12: ffffffbdc4ee7b80 [ 49.655220]@0 x11: 0000000000000100 x10: 0000000000000000 [ 49.655229]@0 x9 : 0000000000000000 x8 : ffffffc0b444e210 [ 49.655237]@0 x7 : 0000000000000000 x6 : ffffffc0b444e1e0 [ 49.655246]@0 x5 : 0000000000000000 x4 : 0000000000000001 [ 49.655254]@0 x3 : 0000000000000000 x2 : 400000000002003d [ 49.655263]@0 x1 : ffffffbdc4ee7b80 x0 : 400000000002003d [ 49.655271]@0 [ 49.656502]@0 Process kworker/u8:7 (pid: 283, stack limit = 0xffffffc174bb4058) [ 49.656509]@0 Call trace: [ 49.656514]@0 [<ffffffc0001deeec>] mpage_prepare_extent_to_map+0x198/0x218 [ 49.656526]@0 [<ffffffc0001e28d0>] ext4_writepages+0x270/0xa58 [ 49.656533]@0 [<ffffffc00012982c>] do_writepages+0x24/0x40 [ 49.656541]@0 [<ffffffc000180160>] __writeback_single_inode+0x40/0x114 [ 49.656549]@0 [<ffffffc000180e50>] writeback_sb_inodes+0x1dc/0x34c [ 49.656555]@0 [<ffffffc00018103c>] __writeback_inodes_wb+0x7c/0xc4 [ 49.656560]@0 [<ffffffc000181224>] wb_writeback+0x110/0x1a8 [ 49.656565]@0 [<ffffffc000181344>] wb_check_old_data_flush+0x88/0x98 [ 49.656571]@0 [<ffffffc00018156c>] bdi_writeback_workfn+0xf4/0x1fc [ 49.656576]@0 [<ffffffc0000b14f8>] process_one_work+0x1e0/0x300 [ 49.656585]@0 [<ffffffc0000b1e14>] worker_thread+0x318/0x438 [ 49.656590]@0 [<ffffffc0000b5da0>] kthread+0xe0/0xec [ 49.656598]@0 Code: f9400260 f9400a63 1ad92063 37580040 (e7f001f2) [ 49.656604]@0 ---[ end trace cbed09f772fd630d ]--- Change-Id: I931da7cb3841db1f130dba298a7d256b6f02d1bc
scoty755
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Dec 4, 2016
bfq maintains a 'next-in-service' cache to prevent expensive lookups in the hot path. However, the cache sometimes becomes inconsistent and triggers a BUG: [44042.622839] -(3)[154:mmcqd/0]BUG: failure at ../../../../../../kernel/cyanogen/mt6735/block/bfq-sched.c:72/bfq_check_next_in_service()! [44042.622858] -(3)[154:mmcqd/0]Unable to handle kernel paging request at virtual address 0000dead [44042.622866] -(3)[154:mmcqd/0]pgd = ffffffc001361000 [44042.622872] [0000dead] *pgd=000000007d816003, *pud=000000007d816003, *pmd=000000007d817003, *pte=0000000000000000 [44042.622890] -(3)[154:mmcqd/0]Internal error: Oops: 96000045 [#1] PREEMPT SMP [44042.622907] -(3)[154:mmcqd/0]CPU: 3 PID: 154 Comm: mmcqd/0 Tainted: [44042.622915] -(3)[154:mmcqd/0]Hardware name: MT6735 (DT) [44042.622922] -(3)[154:mmcqd/0]task: ffffffc0378a6000 ti: ffffffc0378c4000 [44042.622936] -(3)[154:mmcqd/0]PC is at bfq_dispatch_requests+0x6c4/0x9bc [44042.622944] -(3)[154:mmcqd/0]LR is at bfq_dispatch_requests+0x6bc/0x9bc [44042.622952] -(3)[154:mmcqd/0]pc : [<ffffffc000306a68>] lr : [<ffffffc000306a60>] pstate: 800001c5 [44042.622958] -(3)[154:mmcqd/0]sp : ffffffc0378c7d30 [44042.622962] x29: ffffffc0378c7d30 x28: 0000000000000000 [44042.622972] x27: 0000000000000000 x26: ffffffc006c58810 [44042.622981] x25: ffffffc037f89820 x24: ffffffc000f14000 [44042.622990] x23: ffffffc036adb088 x22: ffffffc0369b2800 [44042.623000] x21: ffffffc036adb098 x20: ffffffc01d6a3b60 [44042.623009] x19: ffffffc036adb0c8 x18: 0000007f8cfa1500 [44042.623018] x17: 0000007f8db44f40 x16: ffffffc00012d0c0 [44042.623027] x15: 0000007f8dde04d8 x14: 676f6e6179632f6c [44042.623037] x13: 656e72656b2f2e2e x12: 2f2e2e2f2e2e2f2e [44042.623046] x11: 2e2f2e2e2f2e2e20 x10: 7461206572756c69 [44042.623055] x9 : 6166203a4755425d x8 : 00000000001f0cc5 [44042.623064] x7 : ffffffc000f3d5a0 x6 : 000000000000008b [44042.623073] x5 : 0000000000000000 x4 : 0000000000000004 [44042.623082] x3 : 0000000000000002 x2 : 0000000000000001 [44042.623091] x1 : 0000000000000aee x0 : 000000000000dead This patch makes the lookup resilient to cache inconsistencies by doing the expensive recomputation in cases where the bug would otherwise be triggered. Ticket: PORRDIGE-527 Change-Id: I5dd701960057983a42d3d3bd57521e8d17c03d7f
scoty755
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…ction
(cherry-pick from commit 81da9b13f73653bf5f38c63af8029fc459198ac0)
There is no point in overriding the size class below. It causes fatal
corruption on the next chunk on the 3264-bytes size class, which is the
last size class that is not huge.
For example, if the requested size was exactly 3264 bytes, current
zsmalloc allocates and returns a chunk from the size class of 3264 bytes,
not 4096. User access to this chunk may overwrite head of the next
adjacent chunk.
Here is the panic log captured when freelist was corrupted due to this:
Kernel BUG at ffffffc00030659c [verbose debug info unavailable]
Internal error: Oops - BUG: 96000006 [#1] PREEMPT SMP
Modules linked in:
exynos-snapshot: core register saved(CPU:5)
CPUMERRSR: 0000000000000000, L2MERRSR: 0000000000000000
exynos-snapshot: context saved(CPU:5)
exynos-snapshot: item - log_kevents is disabled
CPU: 5 PID: 898 Comm: kswapd0 Not tainted 3.10.61-4497415-eng #1
task: ffffffc0b8783d80 ti: ffffffc0b71e8000 task.ti: ffffffc0b71e8000
PC is at obj_idx_to_offset+0x0/0x1c
LR is at obj_malloc+0x44/0xe8
pc : [<ffffffc00030659c>] lr : [<ffffffc000306604>] pstate: a0000045
sp : ffffffc0b71eb790
x29: ffffffc0b71eb790 x28: ffffffc00204c000
x27: 000000000001d96f x26: 0000000000000000
x25: ffffffc098cc3500 x24: ffffffc0a13f2810
x23: ffffffc098cc3501 x22: ffffffc0a13f2800
x21: 000011e1a02006e3 x20: ffffffc0a13f2800
x19: ffffffbc02a7e000 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000feb
x15: 0000000000000000 x14: 00000000a01003e3
x13: 0000000000000020 x12: fffffffffffffff0
x11: ffffffc08b264000 x10: 00000000e3a01004
x9 : ffffffc08b263fea x8 : ffffffc0b1e611c0
x7 : ffffffc000307d24 x6 : 0000000000000000
x5 : 0000000000000038 x4 : 000000000000011e
x3 : ffffffbc00003e90 x2 : 0000000000000cc0
x1 : 00000000d0100371 x0 : ffffffbc00003e90
Bug: 25951511
Change-Id: I0c82f61aa779ddf906212ab6e47e16c088fe683c
Reported-by: Sooyong Suk <s.suk@samsung.com>
Signed-off-by: Heesub Shin <heesub.shin@samsung.com>
Tested-by: Sooyong Suk <s.suk@samsung.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
scoty755
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(cherry picked from commit 3d5fe03a3ea013060ebba2a811aeb0f23f56aefa)
We can end up allocating a new compression stream with GFP_KERNEL from
within the IO path, which may result is nested (recursive) IO
operations. That can introduce problems if the IO path in question is a
reclaimer, holding some locks that will deadlock nested IOs.
Allocate streams and working memory using GFP_NOIO flag, forbidding
recursive IO and FS operations.
An example:
inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.
git/20158 [HC0[0]:SC0[0]:HE1:SE1] takes:
(jbd2_handle){+.+.?.}, at: start_this_handle+0x4ca/0x555
{IN-RECLAIM_FS-W} state was registered at:
__lock_acquire+0x8da/0x117b
lock_acquire+0x10c/0x1a7
start_this_handle+0x52d/0x555
jbd2__journal_start+0xb4/0x237
__ext4_journal_start_sb+0x108/0x17e
ext4_dirty_inode+0x32/0x61
__mark_inode_dirty+0x16b/0x60c
iput+0x11e/0x274
__dentry_kill+0x148/0x1b8
shrink_dentry_list+0x274/0x44a
prune_dcache_sb+0x4a/0x55
super_cache_scan+0xfc/0x176
shrink_slab.part.14.constprop.25+0x2a2/0x4d3
shrink_zone+0x74/0x140
kswapd+0x6b7/0x930
kthread+0x107/0x10f
ret_from_fork+0x3f/0x70
irq event stamp: 138297
hardirqs last enabled at (138297): debug_check_no_locks_freed+0x113/0x12f
hardirqs last disabled at (138296): debug_check_no_locks_freed+0x33/0x12f
softirqs last enabled at (137818): __do_softirq+0x2d3/0x3e9
softirqs last disabled at (137813): irq_exit+0x41/0x95
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(jbd2_handle);
<Interrupt>
lock(jbd2_handle);
*** DEADLOCK ***
5 locks held by git/20158:
#0: (sb_writers#7){.+.+.+}, at: [<ffffffff81155411>] mnt_want_write+0x24/0x4b
#1: (&type->i_mutex_dir_key#2/1){+.+.+.}, at: [<ffffffff81145087>] lock_rename+0xd9/0xe3
CyanogenMod#2: (&sb->s_type->i_mutex_key#11){+.+.+.}, at: [<ffffffff8114f8e2>] lock_two_nondirectories+0x3f/0x6b
CyanogenMod#3: (&sb->s_type->i_mutex_key#11/4){+.+.+.}, at: [<ffffffff8114f909>] lock_two_nondirectories+0x66/0x6b
CyanogenMod#4: (jbd2_handle){+.+.?.}, at: [<ffffffff811e31db>] start_this_handle+0x4ca/0x555
stack backtrace:
CPU: 2 PID: 20158 Comm: git Not tainted 4.1.0-rc7-next-20150615-dbg-00016-g8bdf555-dirty #211
Call Trace:
dump_stack+0x4c/0x6e
mark_lock+0x384/0x56d
mark_held_locks+0x5f/0x76
lockdep_trace_alloc+0xb2/0xb5
kmem_cache_alloc_trace+0x32/0x1e2
zcomp_strm_alloc+0x25/0x73 [zram]
zcomp_strm_multi_find+0xe7/0x173 [zram]
zcomp_strm_find+0xc/0xe [zram]
zram_bvec_rw+0x2ca/0x7e0 [zram]
zram_make_request+0x1fa/0x301 [zram]
generic_make_request+0x9c/0xdb
submit_bio+0xf7/0x120
ext4_io_submit+0x2e/0x43
ext4_bio_write_page+0x1b7/0x300
mpage_submit_page+0x60/0x77
mpage_map_and_submit_buffers+0x10f/0x21d
ext4_writepages+0xc8c/0xe1b
do_writepages+0x23/0x2c
__filemap_fdatawrite_range+0x84/0x8b
filemap_flush+0x1c/0x1e
ext4_alloc_da_blocks+0xb8/0x117
ext4_rename+0x132/0x6dc
? mark_held_locks+0x5f/0x76
ext4_rename2+0x29/0x2b
vfs_rename+0x540/0x636
SyS_renameat2+0x359/0x44d
SyS_rename+0x1e/0x20
entry_SYSCALL_64_fastpath+0x12/0x6f
[minchan@kernel.org: add stable mark]
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Kyeongdon Kim <kyeongdon.kim@lge.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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While disabling ConfigFS Android gadget, android_disconnect() calls kill_all_hid_devices(), if CONFIG_USB_CONFIGFS_F_ACC is enabled, to free the registered HIDs without checking whether the USB accessory device really exist or not. If USB accessory device doesn't exist then we run into following kernel panic: ----8<---- [ 136.724761] Unable to handle kernel NULL pointer dereference at virtual address 00000064 [ 136.724809] pgd = c0204000 [ 136.731924] [00000064] *pgd=00000000 [ 136.737830] Internal error: Oops: 5 [#1] SMP ARM [ 136.738108] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.0-rc4-00400-gf75300e-dirty #76 [ 136.742788] task: c0fb19d8 ti: c0fa4000 task.ti: c0fa4000 [ 136.750890] PC is at _raw_spin_lock_irqsave+0x24/0x60 [ 136.756246] LR is at kill_all_hid_devices+0x24/0x114 ---->8---- This patch adds a test to check if USB Accessory device exists before freeing HIDs. Change-Id: Ie229feaf0de3f4f7a151fcaa9a994e34e15ff73b Signed-off-by: Amit Pundir <amit.pundir@linaro.org> (cherry picked from commit 32a71bce154cb89a549b9b7d28e8cf03b889d849) Signed-off-by: Ajay Dudani <adudani@codeaurora.org>
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…eset The problem occurs when iptables constructs the tcp reset packet. It doesn't initialize the pointer to the tcp header within the skb. When the skb is passed to the ixgbe driver for transmit, the ixgbe driver attempts to access the tcp header and crashes. Currently, other drivers (such as our 1G e1000e or igb drivers) don't access the tcp header on transmit unless the TSO option is turned on. <1>BUG: unable to handle kernel NULL pointer dereference at 0000000d <1>IP: [<d081621c>] ixgbe_xmit_frame_ring+0x8cc/0x2260 [ixgbe] <4>*pdpt = 0000000085e5d001 *pde = 0000000000000000 <0>Oops: 0000 [#1] SMP [...] <4>Pid: 0, comm: swapper Tainted: P 2.6.35.12 #1 Greencity/Thurley <4>EIP: 0060:[<d081621c>] EFLAGS: 00010246 CPU: 16 <4>EIP is at ixgbe_xmit_frame_ring+0x8cc/0x2260 [ixgbe] <4>EAX: c7628820 EBX: 00000007 ECX: 00000000 EDX: 00000000 <4>ESI: 00000008 EDI: c6882180 EBP: dfc6b000 ESP: ced95c48 <4> DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 <0>Process swapper (pid: 0, ti=ced94000 task=ced73bd0 task.ti=ced94000) <0>Stack: <4> cbec7418 c779e0d8 c77cc888 c77cc8a8 0903010a 00000000 c77c0008 00000002 <4><0> cd4997c0 00000010 dfc6b000 00000000 d0d176c9 c77cc8d8 c6882180 cbec7318 <4><0> 00000004 00000004 cbec7230 cbec7110 00000000 cbec70c0 c779e000 00000002 <0>Call Trace: <4> [<d0d176c9>] ? 0xd0d176c9 <4> [<d0d18a4d>] ? 0xd0d18a4d <4> [<411e243e>] ? dev_hard_start_xmit+0x218/0x2d7 <4> [<411f03d7>] ? sch_direct_xmit+0x4b/0x114 <4> [<411f056a>] ? __qdisc_run+0xca/0xe0 <4> [<411e28b0>] ? dev_queue_xmit+0x2d1/0x3d0 <4> [<411e8120>] ? neigh_resolve_output+0x1c5/0x20f <4> [<411e94a1>] ? neigh_update+0x29c/0x330 <4> [<4121cf29>] ? arp_process+0x49c/0x4cd <4> [<411f80c9>] ? nf_hook_slow+0x3f/0xac <4> [<4121ca8d>] ? arp_process+0x0/0x4cd <4> [<4121ca8d>] ? arp_process+0x0/0x4cd <4> [<4121c6d5>] ? T.901+0x38/0x3b <4> [<4121c918>] ? arp_rcv+0xa3/0xb4 <4> [<4121ca8d>] ? arp_process+0x0/0x4cd <4> [<411e1173>] ? __netif_receive_skb+0x32b/0x346 <4> [<411e19e1>] ? netif_receive_skb+0x5a/0x5f <4> [<411e1ea9>] ? napi_skb_finish+0x1b/0x30 <4> [<d0816eb4>] ? ixgbe_xmit_frame_ring+0x1564/0x2260 [ixgbe] <4> [<41013468>] ? lapic_next_event+0x13/0x16 <4> [<410429b2>] ? clockevents_program_event+0xd2/0xe4 <4> [<411e1b03>] ? net_rx_action+0x55/0x127 <4> [<4102da1a>] ? __do_softirq+0x77/0xeb <4> [<4102dab1>] ? do_softirq+0x23/0x27 <4> [<41003a67>] ? do_IRQ+0x7d/0x8e <4> [<41002a69>] ? common_interrupt+0x29/0x30 <4> [<41007bcf>] ? mwait_idle+0x48/0x4d <4> [<4100193b>] ? cpu_idle+0x37/0x4c <0>Code: df 09 d7 0f 94 c2 0f b6 d2 e9 e7 fb ff ff 31 db 31 c0 e9 38 ff ff ff 80 78 06 06 0f 85 3e fb ff ff 8b 7c 24 38 8b 8f b8 00 00 00 <0f> b6 51 0d f6 c2 01 0f 85 27 fb ff ff 80 e2 02 75 0d 8b 6c 24 <0>EIP: [<d081621c>] ixgbe_xmit_frame_ring+0x8cc/0x2260 [ixgbe] SS:ESP Signed-off-by: Mukund Jampala <jbmukund@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Apr 3, 2019
I can reliably reproduce the following panic by simply setting an audit rule on a recent 3.5.0+ kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 IP: [<ffffffff810d1250>] audit_copy_inode+0x10/0x90 PGD 7acd9067 PUD 7b8fb067 PMD 0 Oops: 0000 [#86] SMP Modules linked in: nfs nfs_acl auth_rpcgss fscache lockd sunrpc tpm_bios btrfs zlib_deflate libcrc32c kvm_amd kvm joydev virtio_net pcspkr i2c_piix4 floppy virtio_balloon microcode virtio_blk cirrus drm_kms_helper ttm drm i2c_core [last unloaded: scsi_wait_scan] CPU 0 Pid: 1286, comm: abrt-dump-oops Tainted: G D 3.5.0+ #1 Bochs Bochs RIP: 0010:[<ffffffff810d1250>] [<ffffffff810d1250>] audit_copy_inode+0x10/0x90 RSP: 0018:ffff88007aebfc38 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff88003692d860 RCX: 00000000000038c4 RDX: 0000000000000000 RSI: ffff88006baf5d80 RDI: ffff88003692d860 RBP: ffff88007aebfc68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff880036d30f00 R14: ffff88006baf5d80 R15: ffff88003692d800 FS: 00007f7562634740(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000040 CR3: 000000003643d000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process abrt-dump-oops (pid: 1286, threadinfo ffff88007aebe000, task ffff880079614530) Stack: ffff88007aebfdf8 ffff88007aebff28 ffff88007aebfc98 ffffffff81211358 ffff88003692d860 0000000000000000 ffff88007aebfcc8 ffffffff810d4968 ffff88007aebfcc8 ffff8800000038c4 0000000000000000 0000000000000000 Call Trace: [<ffffffff81211358>] ? ext4_lookup+0xe8/0x160 [<ffffffff810d4968>] __audit_inode+0x118/0x2d0 [<ffffffff811955a9>] do_last+0x999/0xe80 [<ffffffff81191fe8>] ? inode_permission+0x18/0x50 [<ffffffff81171efa>] ? kmem_cache_alloc_trace+0x11a/0x130 [<ffffffff81195b4a>] path_openat+0xba/0x420 [<ffffffff81196111>] do_filp_open+0x41/0xa0 [<ffffffff811a24bd>] ? alloc_fd+0x4d/0x120 [<ffffffff811855cd>] do_sys_open+0xed/0x1c0 [<ffffffff810d40cc>] ? __audit_syscall_entry+0xcc/0x300 [<ffffffff811856c1>] sys_open+0x21/0x30 [<ffffffff81611ca9>] system_call_fastpath+0x16/0x1b RSP <ffff88007aebfc38> CR2: 0000000000000040 The problem is that do_last is passing a negative dentry to audit_inode. The comments on lookup_open note that it can pass back a negative dentry if O_CREAT is not set. This patch fixes the oops, but I'm not clear on whether there's a better approach. Cc: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
scoty755
pushed a commit
that referenced
this pull request
Apr 3, 2019
When we try to open a file with O_TMPFILE flag, we will trigger a bug.
The root cause is that in ext4_orphan_add() we check ->i_nlink == 0 and
this check always fails because we set ->i_nlink = 1 in
inode_init_always(). We can use the following program to trigger it:
int main(int argc, char *argv[])
{
int fd;
fd = open(argv[1], O_TMPFILE, 0666);
if (fd < 0) {
perror("open ");
return -1;
}
close(fd);
return 0;
}
The oops message looks like this:
kernel: kernel BUG at fs/ext3/namei.c:1992!
kernel: invalid opcode: 0000 [#1] SMP
kernel: Modules linked in: ext4 jbd2 crc16 cpufreq_ondemand ipv6 dm_mirror dm_region_hash dm_log dm_mod parport_pc parport serio_raw sg dcdbas pcspkr i2c_i801 ehci_pci ehci_hcd button acpi_cpufreq mperf e1000e ptp pps_core ttm drm_kms_helper drm hwmon i2c_algo_bit i2c_core ext3 jbd sd_mod ahci libahci libata scsi_mod uhci_hcd
kernel: CPU: 0 PID: 2882 Comm: tst_tmpfile Not tainted 3.11.0-rc1+ CyanogenMod#4
kernel: Hardware name: Dell Inc. OptiPlex 780 /0V4W66, BIOS A05 08/11/2010
kernel: task: ffff880112d30050 ti: ffff8801124d4000 task.ti: ffff8801124d4000
kernel: RIP: 0010:[<ffffffffa00db5ae>] [<ffffffffa00db5ae>] ext3_orphan_add+0x6a/0x1eb [ext3]
kernel: RSP: 0018:ffff8801124d5cc8 EFLAGS: 00010202
kernel: RAX: 0000000000000000 RBX: ffff880111510128 RCX: ffff8801114683a0
kernel: RDX: 0000000000000000 RSI: ffff880111510128 RDI: ffff88010fcf65a8
kernel: RBP: ffff8801124d5d18 R08: 0080000000000000 R09: ffffffffa00d3b7f
kernel: R10: ffff8801114683a0 R11: ffff8801032a2558 R12: 0000000000000000
kernel: R13: ffff88010fcf6800 R14: ffff8801032a2558 R15: ffff8801115100d8
kernel: FS: 00007f5d172b5700(0000) GS:ffff880117c00000(0000) knlGS:0000000000000000
kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
kernel: CR2: 00007f5d16df15d0 CR3: 0000000110b1d000 CR4: 00000000000407f0
kernel: Stack:
kernel: 000000000000000c ffff8801048a7dc8 ffff8801114685a8 ffffffffa00b80d7
kernel: ffff8801124d5e38 ffff8801032a2558 ffff88010ce24d68 0000000000000000
kernel: ffff88011146b300 ffff8801124d5d44 ffff8801124d5d78 ffffffffa00db7e1
kernel: Call Trace:
kernel: [<ffffffffa00b80d7>] ? journal_start+0x8c/0xbd [jbd]
kernel: [<ffffffffa00db7e1>] ext3_tmpfile+0xb2/0x13b [ext3]
kernel: [<ffffffff821076f8>] path_openat+0x11f/0x5e7
kernel: [<ffffffff821c86b4>] ? list_del+0x11/0x30
kernel: [<ffffffff82065fa2>] ? __dequeue_entity+0x33/0x38
kernel: [<ffffffff82107cd5>] do_filp_open+0x3f/0x8d
kernel: [<ffffffff82112532>] ? __alloc_fd+0x50/0x102
kernel: [<ffffffff820f9296>] do_sys_open+0x13b/0x1cd
kernel: [<ffffffff820f935c>] SyS_open+0x1e/0x20
kernel: [<ffffffff82398c02>] system_call_fastpath+0x16/0x1b
kernel: Code: 39 c7 0f 85 67 01 00 00 0f b7 03 25 00 f0 00 00 3d 00 40 00 00 74 18 3d 00 80 00 00 74 11 3d 00 a0 00 00 74 0a 83 7b 48 00 74 04 <0f> 0b eb fe 49 8b 85 50 03 00 00 4c 89 f6 48 c7 c7 c0 99 0e a0
kernel: RIP [<ffffffffa00db5ae>] ext3_orphan_add+0x6a/0x1eb [ext3]
kernel: RSP <ffff8801124d5cc8>
Here we couldn't call clear_nlink() directly because in d_tmpfile() we
will call inode_dec_link_count() to decrease ->i_nlink. So this commit
tries to call d_tmpfile() before ext4_orphan_add() to fix this problem.
Change-Id: I7c71cb75eaa579fd85d37dd8b1d22cb843d48361
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
scoty755
pushed a commit
that referenced
this pull request
Apr 3, 2019
When we try to open a file with O_TMPFILE flag, we will trigger a bug.
The root cause is that in ext4_orphan_add() we check ->i_nlink == 0 and
this check always fails because we set ->i_nlink = 1 in
inode_init_always(). We can use the following program to trigger it:
int main(int argc, char *argv[])
{
int fd;
fd = open(argv[1], O_TMPFILE, 0666);
if (fd < 0) {
perror("open ");
return -1;
}
close(fd);
return 0;
}
The oops message looks like this:
kernel BUG at fs/ext4/namei.c:2572!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: dlci bridge stp hidp cmtp kernelcapi l2tp_ppp l2tp_netlink l2tp_core sctp libcrc32c rfcomm tun fuse nfnetli
nk can_raw ipt_ULOG can_bcm x25 scsi_transport_iscsi ipx p8023 p8022 appletalk phonet psnap vmw_vsock_vmci_transport af_key vmw_vmci rose vsock atm can netrom ax25 af_rxrpc ir
da pppoe pppox ppp_generic slhc bluetooth nfc rfkill rds caif_socket caif crc_ccitt af_802154 llc2 llc snd_hda_codec_realtek snd_hda_intel snd_hda_codec serio_raw snd_pcm pcsp
kr edac_core snd_page_alloc snd_timer snd soundcore r8169 mii sr_mod cdrom pata_atiixp radeon backlight drm_kms_helper ttm
CPU: 1 PID: 1812571 Comm: trinity-child2 Not tainted 3.11.0-rc1+ #12
Hardware name: Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H, BIOS F12a 04/23/2010
task: ffff88007dfe69a0 ti: ffff88010f7b6000 task.ti: ffff88010f7b6000
RIP: 0010:[<ffffffff8125ce69>] [<ffffffff8125ce69>] ext4_orphan_add+0x299/0x2b0
RSP: 0018:ffff88010f7b7cf8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8800966d3020 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88007dfe70b8 RDI: 0000000000000001
RBP: ffff88010f7b7d40 R08: ffff880126a3c4e0 R09: ffff88010f7b7ca0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801271fd668
R13: ffff8800966d2f78 R14: ffff88011d7089f0 R15: ffff88007dfe69a0
FS: 00007f70441a3740(0000) GS:ffff88012a800000(0000) knlGS:00000000f77c96c0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002834000 CR3: 0000000107964000 CR4: 00000000000007e0
DR0: 0000000000780000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
0000000000002000 00000020810b6dde 0000000000000000 ffff88011d46db00
ffff8800966d3020 ffff88011d7089f0 ffff88009c7f4c10 ffff88010f7b7f2c
ffff88007dfe69a0 ffff88010f7b7da8 ffffffff8125cfac ffff880100000004
Call Trace:
[<ffffffff8125cfac>] ext4_tmpfile+0x12c/0x180
[<ffffffff811cba78>] path_openat+0x238/0x700
[<ffffffff8100afc4>] ? native_sched_clock+0x24/0x80
[<ffffffff811cc647>] do_filp_open+0x47/0xa0
[<ffffffff811db73f>] ? __alloc_fd+0xaf/0x200
[<ffffffff811ba2e4>] do_sys_open+0x124/0x210
[<ffffffff81010725>] ? syscall_trace_enter+0x25/0x290
[<ffffffff811ba3ee>] SyS_open+0x1e/0x20
[<ffffffff816ca8d4>] tracesys+0xdd/0xe2
[<ffffffff81001001>] ? start_thread_common.constprop.6+0x1/0xa0
Code: 04 00 00 00 89 04 24 31 c0 e8 c4 77 04 00 e9 43 fe ff ff 66 25 00 d0 66 3d 00 80 0f 84 0e fe ff ff 83 7b 48 00 0f 84 04 fe ff ff <0f> 0b 49 8b 8c 24 50 07 00 00 e9 88 fe ff ff 0f 1f 84 00 00 00
Here we couldn't call clear_nlink() directly because in d_tmpfile() we
will call inode_dec_link_count() to decrease ->i_nlink. So this commit
tries to call d_tmpfile() before ext4_orphan_add() to fix this problem.
Change-Id: I04dca79854fc9b4932df853251e28419721aabf5
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Tested-by: Darrick J. Wong <darrick.wong@oracle.com>
Tested-by: Dave Jones <davej@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
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CM系ROMでタッチが感度が悪いのにイライラしたので、
HTCリリースのdtsファイルで差し替えてみました。
うちのb2wljでテストする限りでは良好な結果が得られています。
他のb2シリーズに適用しても平気なのかどうかはわかりませんが…