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SubjectRe: Linux 4.19-rc1
On Sun, Aug 26, 2018 at 3:51 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> So two weeks have passed, and the merge window for 4.19 is over.
>


> Anyway, go forth and test,
>

I am seeing the errors use-after-free errors in mei_cl_write. dmesg as follows.
Adding Tomas Winkler to the thread.

[ 12.602912] PM: Adding info for
mei:mei::309dcde8-ccb1-4062-8f78-600115a34327:01
[ 12.603126] ==================================================================
[ 12.603205] BUG: KASAN: use-after-free in mei_cl_write+0x481/0x860
[ 12.603248] Read of size 8 at addr ffff880416d3a320 by task kworker/2:1/68

[ 12.603311] CPU: 2 PID: 68 Comm: kworker/2:1 Tainted: G W
4.19.0-rc1 #1
[ 12.603363] Hardware name: System76, Inc. Wild Dog
Performance/H87-PLUS, BIOS 0705 12/05/2013
[ 12.603420] Workqueue: events mei_cl_bus_rescan_work
[ 12.603459] Call Trace:
[ 12.603486] dump_stack+0x7c/0xbb
[ 12.603520] print_address_description+0x73/0x280
[ 12.603560] kasan_report+0x258/0x380
[ 12.603589] ? mei_cl_write+0x481/0x860
[ 12.603625] mei_cl_write+0x481/0x860
[ 12.603664] ? mei_cl_irq_write+0x570/0x570
[ 12.603699] ? kasan_unpoison_shadow+0x30/0x40
[ 12.603735] ? kasan_kmalloc+0xa0/0xd0
[ 12.603770] ? wait_woken+0x140/0x140
[ 12.603803] ? mei_cl_alloc_cb+0xa9/0xf0
[ 12.603847] __mei_cl_send+0x371/0x3e0
[ 12.603888] ? wait_for_completion+0x1d0/0x1d0
[ 12.603923] ? mei_cldev_driver_unregister+0x40/0x40
[ 12.603961] ? find_first_zero_bit+0x19/0x70
[ 12.604014] mei_mkhi_fix+0x12d/0x480
[ 12.604045] ? worker_thread+0x69/0x690
[ 12.604075] ? kthread+0x1ae/0x1d0
[ 12.604103] ? ret_from_fork+0x3a/0x50
[ 12.604135] ? check_chain_key+0x139/0x1f0
[ 12.604173] ? mei_wd+0xa0/0xa0
[ 12.604203] ? mark_lock+0xc7/0x7c0
[ 12.604234] ? mark_lock+0xc7/0x7c0
[ 12.604285] mei_cl_bus_dev_fixup+0x196/0x1b0
[ 12.604322] ? mei_nfc+0x4d0/0x4d0
[ 12.604354] ? lockdep_hardirqs_on+0x18c/0x280
[ 12.604400] ? __kasan_slab_free+0x143/0x180
[ 12.604441] ? mei_cl_bus_rescan_work+0x2f1/0x500
[ 12.604477] mei_cl_bus_rescan_work+0x2f1/0x500
[ 12.604527] process_one_work+0x5e5/0xb00
[ 12.604573] ? wq_pool_ids_show+0x1e0/0x1e0
[ 12.604628] worker_thread+0x69/0x690
[ 12.604675] ? process_one_work+0xb00/0xb00
[ 12.604706] kthread+0x1ae/0x1d0
[ 12.604734] ? kthread_create_worker_on_cpu+0xc0/0xc0
[ 12.604776] ret_from_fork+0x3a/0x50

[ 12.604845] Allocated by task 68:
[ 12.604872] kasan_kmalloc+0xa0/0xd0
[ 12.604900] kmem_cache_alloc_trace+0x118/0x250
[ 12.604933] mei_cl_alloc_cb+0x3b/0xf0
[ 12.604962] __mei_cl_send+0x312/0x3e0
[ 12.604991] mei_mkhi_fix+0x12d/0x480
[ 12.605020] mei_cl_bus_dev_fixup+0x196/0x1b0
[ 12.605052] mei_cl_bus_rescan_work+0x2f1/0x500
[ 12.605085] process_one_work+0x5e5/0xb00
[ 12.605116] worker_thread+0x69/0x690
[ 12.605144] kthread+0x1ae/0x1d0
[ 12.605170] ret_from_fork+0x3a/0x50

[ 12.605213] Freed by task 104:
[ 12.605238] __kasan_slab_free+0x12e/0x180
[ 12.605269] kfree+0xd4/0x250
[ 12.605294] mei_cl_complete+0xc1/0x230
[ 12.605324] mei_irq_compl_handler+0x95/0xf0
[ 12.605356] mei_me_irq_thread_handler+0x7e5/0xc90
[ 12.605391] irq_thread_fn+0x3f/0x80
[ 12.605418] irq_thread+0x175/0x250
[ 12.605446] kthread+0x1ae/0x1d0
[ 12.605472] ret_from_fork+0x3a/0x50

[ 12.605515] The buggy address belongs to the object at ffff880416d3a300
which belongs to the cache kmalloc-96 of size 96
[ 12.605591] The buggy address is located 32 bytes inside of
96-byte region [ffff880416d3a300, ffff880416d3a360)
[ 12.605662] The buggy address belongs to the page:
[ 12.605697] page:ffffea00105b4e80 count:1 mapcount:0
mapping:ffff8800b580f400 index:0x0
[ 12.605753] flags: 0xa00000000000100(slab)
[ 12.605785] raw: 0a00000000000100 dead000000000100 dead000000000200
ffff8800b580f400
[ 12.605838] raw: 0000000000000000 0000000080200020 00000001ffffffff
0000000000000000
[ 12.605888] page dumped because: kasan: bad access detected

[ 12.605941] Memory state around the buggy address:
[ 12.605976] ffff880416d3a200: fb fb fb fb fb fb fb fb fb fb fb fb
fc fc fc fc
[ 12.606024] ffff880416d3a280: fb fb fb fb fb fb fb fb fb fb fb fb
fc fc fc fc
[ 12.606073] >ffff880416d3a300: fb fb fb fb fb fb fb fb fb fb fb fb
fc fc fc fc
[ 12.606121] ^
[ 12.606152] ffff880416d3a380: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[ 12.606201] ffff880416d3a400: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[ 12.606249] =================================================================

thanks,
-- Shuah

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