linux-kernel - [inotify_read] BUG: KASAN: slab-out-of-bounds in _copy_to

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Message-ID: <20171107100552.jqvf4n7p4ypdeuw7@wfg-t540p.sh.intel.com>
Date:   Tue, 7 Nov 2017 18:05:52 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Nikolay Borisov <n.borisov.lkml@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [inotify_read] BUG: KASAN: slab-out-of-bounds in
 _copy_to_user+0x115/0x1b0

Hello,

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

[   10.399545] Freeing unused kernel memory: 824K
[   10.403510] Freeing unused kernel memory: 1436K
[   10.412726] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[   10.413605] rodata_test: all tests were successful
[   10.454893] ==================================================================
[   10.456507] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x115/0x1b0
[   10.457976] Read of size 5 at addr ffff880014bdb4ac by task init/1
[   10.459262] 
[   10.459553] CPU: 1 PID: 1 Comm: init Not tainted 4.14.0-rc8 #14
[   10.460345] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   10.461459] Call Trace:
[   10.461860]  dump_stack+0x5d/0x81
[   10.462365]  print_address_description+0xa7/0x280
[   10.463015]  ? _copy_to_user+0x115/0x1b0
[   10.463581]  ? _copy_to_user+0x115/0x1b0
[   10.464155]  kasan_report+0xd3/0x150
[   10.464682]  ? _copy_to_user+0x115/0x1b0
[   10.465247]  _copy_to_user+0x115/0x1b0
[   10.465793]  copy_event_to_user+0x102/0x150
[   10.466465]  inotify_read+0x1d9/0x240
[   10.467003]  ? init_wait_entry+0x30/0x30
[   10.467604]  vfs_read+0x157/0x250
[   10.468101]  SyS_read+0x50/0xc0
[   10.468583]  entry_SYSCALL_64_fastpath+0x1e/0xa9
[   10.469228] RIP: 0033:0x7f0189404d10
[   10.469751] RSP: 002b:00007ffe90c137e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[   10.470773] RAX: ffffffffffffffda RBX: 00007f01891e7720 RCX: 00007f0189404d10
[   10.471706] RDX: 0000000000002000 RSI: 0000559436fc0d90 RDI: 0000000000000005
[   10.472634] RBP: 0000000000002041 R08: 0000000000000000 R09: 0000000001000000
[   10.473560] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f01891e7778
[   10.474485] R13: 0000000000002030 R14: 0000559436fc0d50 R15: 0000000000001271
[   10.475408] 
[   10.475698] Allocated by task 151:
[   10.476210]  kasan_kmalloc+0x61/0xf0
[   10.476799]  __kmalloc+0x1ad/0x2e0
[   10.477347]  inotify_handle_event+0x97/0x1a0
[   10.477954]  send_to_group+0xfe/0x160
[   10.478490]  fsnotify+0x158/0x2e0
[   10.478983]  vfs_link+0x29c/0x340
[   10.479484]  SyS_linkat+0x22c/0x300
[   10.479994]  entry_SYSCALL_64_fastpath+0x1e/0xa9
[   10.480638] 
[   10.480928] Freed by task 1:
[   10.481376]  kasan_slab_free+0xac/0x180
[   10.481930]  kfree+0x105/0x310
[   10.482403]  unpack_to_rootfs+0x255/0x2a1
[   10.482973]  populate_rootfs+0x5d/0x86
[   10.483517]  do_one_initcall+0x3b/0x180
[   10.484075]  do_basic_setup+0xb4/0xd0
[   10.484617]  kernel_init_freeable+0x7b/0xed
[   10.485222]  kernel_init+0xe/0x110
[   10.485725]  ret_from_fork+0x25/0x30
[   10.486251] 
[   10.486538] The buggy address belongs to the object at ffff880014bdb480
[   10.486538]  which belongs to the cache kmalloc-64 of size 64
[   10.488137] The buggy address is located 44 bytes inside of
[   10.488137]  64-byte region [ffff880014bdb480, ffff880014bdb4c0)

Attached the full dmesg and kconfig.

Thanks,
Fengguang

View attachment "dmesg-quantal-kbuild-22:20171107065800:x86_64-randconfig-w0-11070616:4.14.0-rc8:14" of type "text/plain" (107923 bytes)

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