linux-kernel - Re: fanotify use after free.

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Date:	Wed, 22 Jan 2014 11:43:11 -0500
From:	Dave Jones <davej@...hat.com>
To:	jack@...e.cz, Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: fanotify use after free.

On Wed, Jan 22, 2014 at 01:27:30AM -0500, Dave Jones wrote:
 > Jan,
 > 
 > since yesterdays changes, on boot I see a flood of messages from slub debug during boot..
 > 
 > =============================================================================
 > BUG fanotify_event_info (Not tainted): Poison overwritten
 > -----------------------------------------------------------------------------
 > 
 > Disabling lock debugging due to kernel taint
 > INFO: 0xffff880247e45bc8-0xffff880247e45bcb. First byte 0x0 instead of 0x6b
 > INFO: Allocated in fanotify_handle_event+0x136/0x390 age=0 cpu=0 pid=293
 >  __slab_alloc+0x456/0x565
 >  kmem_cache_alloc+0x1fe/0x260
 >  fanotify_handle_event+0x136/0x390
 >  send_to_group+0xd3/0x1c0
 >  fsnotify+0x1c8/0x340
 >  open_exec+0xe2/0x120
 >  load_elf_binary+0x7b7/0x18e0
 >  search_binary_handler+0x94/0x1b0
 >  do_execve_common.isra.26+0x5d7/0x7d0
 >  SyS_execve+0x36/0x50
 >  stub_execve+0x69/0xa0
 > INFO: Freed in fanotify_free_event+0x2e/0x40 age=0 cpu=3 pid=290
 >  __slab_free+0x4a/0x382
 >  kmem_cache_free+0x1c9/0x210
 >  fanotify_free_event+0x2e/0x40
 >  fsnotify_destroy_event+0x21/0x30
 >  fanotify_read+0x39e/0x5e0
 >  vfs_read+0x9b/0x160
 >  SyS_read+0x58/0xb0
 >  tracesys+0xdd/0xe2
 > INFO: Slab 0xffffea00091f9100 objects=20 used=20 fp=0x          (null) flags=0x20000000004080

Reverting 7053aee26a3548ebaba046ae2e52396ccf56ac6c makes this go away.

	Dave

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