* UBSAN: Undefined behaviour in lib/radix-tree.c:123:14: member access within null pointer of type 'const struct radix_tree_node'
@ 2018-07-20 7:53 Paul Menzel
0 siblings, 0 replies; 3+ messages in thread
From: Paul Menzel @ 2018-07-20 7:53 UTC (permalink / raw)
To: Matthew Wilcox; +Cc: linux-kernel
Dear Linux folks,
Enabling the undefined behavior sanitizer and building GNU/Linux
4.18-rc5+ (with some unrelated commits) with GCC 8.1.0 from Debian
Sid/unstable, the warning below is shown.
> [ 0.958688] ================================================================================
> [ 0.959029] UBSAN: Undefined behaviour in lib/radix-tree.c:123:14
> [ 0.959212] member access within null pointer of type 'const struct radix_tree_node'
> [ 0.959472] CPU: 0 PID: 24 Comm: kworker/0:2 Not tainted 4.18.0-rc5-00316-g4864b68cedf2 #104
> [ 0.959475] Hardware name: ASROCK E350M1/E350M1, BIOS TIMELESS 01/01/1970
> [ 0.959488] Workqueue: events_power_efficient ioc_release_fn
> [ 0.959492] Call Trace:
> [ 0.959501] dump_stack+0x55/0x89
> [ 0.959507] ubsan_epilogue+0xb/0x33
> [ 0.959511] handle_null_ptr_deref+0x7f/0x90
> [ 0.959516] __ubsan_handle_type_mismatch_v1+0x55/0x60
> [ 0.959521] __radix_tree_delete+0xc5/0xe0
> [ 0.959525] radix_tree_delete_item+0x5f/0xf0
> [ 0.959529] radix_tree_delete+0xa/0x10
> [ 0.959532] ioc_destroy_icq+0x58/0x1f0
> [ 0.959538] ? free_tty_struct+0x34/0x50
> [ 0.959541] ioc_release_fn+0x9c/0x1a0
> [ 0.959548] process_one_work+0x220/0x700
> [ 0.959553] worker_thread+0x5a/0x690
> [ 0.959557] kthread+0x14e/0x200
> [ 0.959561] ? drain_workqueue+0x290/0x290
> [ 0.959565] ? kthread_create_worker_on_cpu+0x30/0x30
> [ 0.959568] ret_from_fork+0x1c/0x38
> [ 0.959572] ================================================================================
Kind regards,
Paul
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: UBSAN: Undefined behaviour in lib/radix-tree.c:123:14: member access within null pointer of type 'const struct radix_tree_node'
2018-07-20 8:31 Mark Rutland
@ 2018-10-08 23:16 ` Stephen Boyd
0 siblings, 0 replies; 3+ messages in thread
From: Stephen Boyd @ 2018-10-08 23:16 UTC (permalink / raw)
To: Mark Rutland, Paul Menzel; +Cc: Matthew Wilcox, linux-kernel
Quoting Mark Rutland (2018-07-20 01:31:02)
> In-Reply-To: <19427cc3-3372-9b02-4b92-096fbe328622@molgen.mpg.de>
>
> On Fri, Jul 20, 2018 at 09:53:21AM +0200, Paul Menzel wrote:
> > Dear Linux folks,
>
> Hi,
>
> > Enabling the undefined behavior sanitizer and building GNU/Linux 4.18-rc5+
> > (with some unrelated commits) with GCC 8.1.0 from Debian Sid/unstable, the
> > warning below is shown.
> >
> > > [ 0.958688] ================================================================================
> > > [ 0.959029] UBSAN: Undefined behaviour in lib/radix-tree.c:123:14
>
> That's in get_slot_offset(), and I think this is addressed by the patch [1] I previously sent.
>
> There are at least a couple of instances in the radix tree code, and I had
> intended to address them together, but I haven't had the chance over the last
> couple of weeks.
>
> I will try to get back to that soon.
Do you have that reworked patch lying around somewhere? I ran into an
ubsan error in radix-tree today and patch [1] fixes things.
> [1] https://lkml.kernel.org/r/20180706134144.48446-1-mark.rutland@arm.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: UBSAN: Undefined behaviour in lib/radix-tree.c:123:14: member access within null pointer of type 'const struct radix_tree_node'
@ 2018-07-20 8:31 Mark Rutland
2018-10-08 23:16 ` Stephen Boyd
0 siblings, 1 reply; 3+ messages in thread
From: Mark Rutland @ 2018-07-20 8:31 UTC (permalink / raw)
To: Paul Menzel; +Cc: Matthew Wilcox, linux-kernel
In-Reply-To: <19427cc3-3372-9b02-4b92-096fbe328622@molgen.mpg.de>
On Fri, Jul 20, 2018 at 09:53:21AM +0200, Paul Menzel wrote:
> Dear Linux folks,
Hi,
> Enabling the undefined behavior sanitizer and building GNU/Linux 4.18-rc5+
> (with some unrelated commits) with GCC 8.1.0 from Debian Sid/unstable, the
> warning below is shown.
>
> > [ 0.958688] ================================================================================
> > [ 0.959029] UBSAN: Undefined behaviour in lib/radix-tree.c:123:14
That's in get_slot_offset(), and I think this is addressed by the patch [1] I previously sent.
There are at least a couple of instances in the radix tree code, and I had
intended to address them together, but I haven't had the chance over the last
couple of weeks.
I will try to get back to that soon.
> > [ 0.959212] member access within null pointer of type 'const struct radix_tree_node'
> > [ 0.959472] CPU: 0 PID: 24 Comm: kworker/0:2 Not tainted 4.18.0-rc5-00316-g4864b68cedf2 #104
> > [ 0.959475] Hardware name: ASROCK E350M1/E350M1, BIOS TIMELESS 01/01/1970
> > [ 0.959488] Workqueue: events_power_efficient ioc_release_fn
> > [ 0.959492] Call Trace:
> > [ 0.959501] dump_stack+0x55/0x89
> > [ 0.959507] ubsan_epilogue+0xb/0x33
> > [ 0.959511] handle_null_ptr_deref+0x7f/0x90
> > [ 0.959516] __ubsan_handle_type_mismatch_v1+0x55/0x60
> > [ 0.959521] __radix_tree_delete+0xc5/0xe0
> > [ 0.959525] radix_tree_delete_item+0x5f/0xf0
> > [ 0.959529] radix_tree_delete+0xa/0x10
> > [ 0.959532] ioc_destroy_icq+0x58/0x1f0
> > [ 0.959538] ? free_tty_struct+0x34/0x50
> > [ 0.959541] ioc_release_fn+0x9c/0x1a0
> > [ 0.959548] process_one_work+0x220/0x700
> > [ 0.959553] worker_thread+0x5a/0x690
> > [ 0.959557] kthread+0x14e/0x200
> > [ 0.959561] ? drain_workqueue+0x290/0x290
> > [ 0.959565] ? kthread_create_worker_on_cpu+0x30/0x30
> > [ 0.959568] ret_from_fork+0x1c/0x38
> > [ 0.959572] ================================================================================
Thanks,
Mark.
[1] https://lkml.kernel.org/r/20180706134144.48446-1-mark.rutland@arm.com
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-07-20 7:53 UBSAN: Undefined behaviour in lib/radix-tree.c:123:14: member access within null pointer of type 'const struct radix_tree_node' Paul Menzel
2018-07-20 8:31 Mark Rutland
2018-10-08 23:16 ` Stephen Boyd
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