linux-kernel - [devkmsg_write] BUG: KASAN: slab-out-of-bounds in copyin+0xea/0x170

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Date:   Tue, 7 Nov 2017 17:39:21 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     linux-kernel@...r.kernel.org
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Aleksey Makarov <aleksey.makarov@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>
Subject: [devkmsg_write] BUG: KASAN: slab-out-of-bounds in copyin+0xea/0x170

Hello,

FYI this happens in v4.14-rc8 -- it's not necessarily a new bug.

[   22.184920] Freeing unused kernel memory: 824K
[   22.199198] Freeing unused kernel memory: 1436K
[   22.228460] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[   22.230474] rodata_test: all tests were successful
[   22.254830] ==================================================================
[   22.257125] BUG: KASAN: slab-out-of-bounds in copyin+0xea/0x170
[   22.258648] Write of size 26 at addr ffff880013432540 by task init/1
[   22.260272] 
[   22.260860] CPU: 0 PID: 1 Comm: init Not tainted 4.14.0-rc8 #14
[   22.262379] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   22.264441] Call Trace:
[   22.265206]  dump_stack+0x5d/0x81
[   22.266147]  print_address_description+0xa7/0x280
[   22.267369]  ? copyin+0xea/0x170
[   22.268282]  ? copyin+0xea/0x170
[   22.268990]  kasan_report+0xd3/0x150
[   22.269551]  ? quarantine_reduce+0x1/0x1a0
[   22.270177]  ? copyin+0xea/0x170
[   22.270703]  copyin+0xea/0x170
[   22.271202]  _copy_from_iter_full+0x14f/0x4f0
[   22.271857]  ? __kmalloc+0x1ad/0x2e0
[   22.272420]  devkmsg_write+0xb9/0x1a0
[   22.272999]  new_sync_write+0xd8/0x130
[   22.273579]  vfs_write+0x174/0x2b0
[   22.274113]  SyS_write+0x50/0xc0
[   22.274611]  do_int80_syscall_32+0x7a/0x1b0
[   22.275216]  entry_INT80_compat+0x2d/0x40
[   22.275802] 
[   22.276103] Allocated by task 1:
[   22.276597]  kasan_kmalloc+0x61/0xf0
[   22.277202]  __kmalloc+0x1ad/0x2e0
[   22.277720]  devkmsg_write+0x76/0x1a0
[   22.278268]  new_sync_write+0xd8/0x130
[   22.278826]  vfs_write+0x174/0x2b0
[   22.279342]  SyS_write+0x50/0xc0
[   22.279840]  do_int80_syscall_32+0x7a/0x1b0
[   22.280441]  entry_INT80_compat+0x2d/0x40
[   22.281025] 
[   22.281326] Freed by task 1:
[   22.281788]  kasan_slab_free+0xac/0x180
[   22.282354]  kfree+0x105/0x310
[   22.282837]  unpack_to_rootfs+0x260/0x2a1
[   22.283420]  populate_rootfs+0x5d/0x86
[   22.283977]  do_one_initcall+0x3b/0x180
[   22.284544]  do_basic_setup+0xb4/0xd0
[   22.285091]  kernel_init_freeable+0x7b/0xed
[   22.285680]  kernel_init+0xe/0x110
[   22.286171]  ret_from_fork+0x25/0x30
[   22.286683] 
[   22.286967] The buggy address belongs to the object at ffff880013432540
[   22.286967]  which belongs to the cache kmalloc-32 of size 32
[   22.288469] The buggy address is located 0 bytes inside of
[   22.288469]  32-byte region [ffff880013432540, ffff880013432560)

Attached the full dmesg and kconfig.

Thanks,
Fengguang

View attachment "dmesg-vm-lkp-hsw01-openwrt-ia32-11:20171107070504:x86_64-randconfig-w0-11070616:4.14.0-rc8:14" of type "text/plain" (69841 bytes)

View attachment ".config" of type "text/plain" (147793 bytes)