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SubjectRe: [PATCH -next] drivers/base/test: fix global-out-of-bounds error
On Mon, Jan 06, 2020 at 11:37:35AM -0500, Qian Cai wrote:
> The commit c032ace71c29 ("software node: add basic tests for property
> entries") introduced a global-out-of-bounds error because it forgot to
> add a terminator of "nodes "for software_node_register_nodes() to
> process.
>
> # Subtest: property-entry
> 1..7
> ok 1 - pe_test_uints
> ok 2 - pe_test_uint_arrays
> ok 3 - pe_test_strings
> ok 4 - pe_test_bool
> ok 5 - pe_test_move_inline_u8
> ok 6 - pe_test_move_inline_str
> ==================================================================
> BUG: KASAN: global-out-of-bounds in
> software_node_register_nodes+0x41/0x80
> Read of size 8 at addr ffffffff989ef250 by task kunit_try_catch/316
>
> CPU: 17 PID: 316 Comm: kunit_try_catch Not tainted
> 5.5.0-rc4-next-20200106+ #1
> Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40
> 03/09/2018
> Call Trace:
> dump_stack+0xa0/0xea
> print_address_description.constprop.5.cold.7+0x64/0x384
> __kasan_report.cold.8+0x7a/0xc0
> kasan_report+0x12/0x20
> __asan_load8+0x71/0xa0
> software_node_register_nodes+0x41/0x80
> pe_test_reference+0x1eb/0x1200
> kunit_try_run_case+0x6b/0xd1
> kunit_generic_run_threadfn_adapter+0x29/0x50
> kthread+0x1e6/0x210
> ret_from_fork+0x27/0x50
>
> The buggy address belongs to the variable:
> nodes.21544+0x30/0x920
>
> Memory state around the buggy address:
> ffffffff989ef100: fa fa fa fa 00 04 fa fa fa fa fa fa 00 00 00 00
> ffffffff989ef180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> >ffffffff989ef200: fa fa fa fa 00 00 00 00 00 00 fa fa fa fa fa fa
> ^
> ffffffff989ef280: 00 06 fa fa fa fa fa fa 00 00 04 fa fa fa fa fa
> ffffffff989ef300: 00 00 fa fa fa fa fa fa 00 05 fa fa fa fa fa fa
> ==================================================================
> Disabling lock debugging due to kernel taint
> ok 7 - pe_test_reference
> ok 8 - property-entry
>
> Fixes: c032ace71c29 ("software node: add basic tests for property entries")
> Signed-off-by: Qian Cai <cai@lca.pw>

Thanks Qian.

Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

> ---
> drivers/base/test/property-entry-test.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/base/test/property-entry-test.c b/drivers/base/test/property-entry-test.c
> index da812834b631..abe03315180f 100644
> --- a/drivers/base/test/property-entry-test.c
> +++ b/drivers/base/test/property-entry-test.c
> @@ -366,6 +366,7 @@ static void pe_test_reference(struct kunit *test)
> static const struct software_node nodes[] = {
> { .name = "1", },
> { .name = "2", },
> + { }
> };
>
> static const struct software_node_ref_args refs[] = {
> --
> 2.21.0 (Apple Git-122.2)
>

--
Dmitry

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