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| author | Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> | 2018-10-31 02:50:25 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2018-11-05 20:34:08 +0100 |
| commit | af31b04b67f4fd7f639fd465a507c154c46fc9fb (patch) | |
| tree | 8e5d243cca7c1ea46bab279cd0fad2120174bb1c /tools | |
| parent | Linux 4.20-rc1 (diff) | |
| download | linux-af31b04b67f4fd7f639fd465a507c154c46fc9fb.tar.xz linux-af31b04b67f4fd7f639fd465a507c154c46fc9fb.zip | |
tools/testing/nvdimm: Fix the array size for dimm devices.
KASAN reports following global out of bounds access while
nfit_test is being loaded. The out of bound access happens
the following reference to dimm_fail_cmd_flags[dimm]. 'dimm' is
over than the index value, NUM_DCR (==5).
static int override_return_code(int dimm, unsigned int func, int rc)
{
if ((1 << func) & dimm_fail_cmd_flags[dimm]) {
dimm_fail_cmd_flags[] definition:
static unsigned long dimm_fail_cmd_flags[NUM_DCR];
'dimm' is the return value of get_dimm(), and get_dimm() returns
the index of handle[] array. The handle[] has 7 index. Let's use
ARRAY_SIZE(handle) as the array size.
KASAN report:
==================================================================
BUG: KASAN: global-out-of-bounds in nfit_test_ctl+0x47bb/0x55b0 [nfit_test]
Read of size 8 at addr ffffffffc10cbbe8 by task kworker/u41:0/8
...
Call Trace:
dump_stack+0xea/0x1b0
? dump_stack_print_info.cold.0+0x1b/0x1b
? kmsg_dump_rewind_nolock+0xd9/0xd9
print_address_description+0x65/0x22e
? nfit_test_ctl+0x47bb/0x55b0 [nfit_test]
kasan_report.cold.6+0x92/0x1a6
nfit_test_ctl+0x47bb/0x55b0 [nfit_test]
...
The buggy address belongs to the variable:
dimm_fail_cmd_flags+0x28/0xffffffffffffa440 [nfit_test]
==================================================================
Fixes: 39611e83a28c ("tools/testing/nvdimm: Make DSM failure code injection...")
Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/nvdimm/test/nfit.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index 9527d47a1070..01ec04bf91b5 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -140,8 +140,8 @@ static u32 handle[] = { [6] = NFIT_DIMM_HANDLE(1, 0, 0, 0, 1), }; -static unsigned long dimm_fail_cmd_flags[NUM_DCR]; -static int dimm_fail_cmd_code[NUM_DCR]; +static unsigned long dimm_fail_cmd_flags[ARRAY_SIZE(handle)]; +static int dimm_fail_cmd_code[ARRAY_SIZE(handle)]; static const struct nd_intel_smart smart_def = { .flags = ND_INTEL_SMART_HEALTH_VALID @@ -205,7 +205,7 @@ struct nfit_test { unsigned long deadline; spinlock_t lock; } ars_state; - struct device *dimm_dev[NUM_DCR]; + struct device *dimm_dev[ARRAY_SIZE(handle)]; struct nd_intel_smart *smart; struct nd_intel_smart_threshold *smart_threshold; struct badrange badrange; @@ -2680,7 +2680,7 @@ static int nfit_test_probe(struct platform_device *pdev) u32 nfit_handle = __to_nfit_memdev(nfit_mem)->device_handle; int i; - for (i = 0; i < NUM_DCR; i++) + for (i = 0; i < ARRAY_SIZE(handle); i++) if (nfit_handle == handle[i]) dev_set_drvdata(nfit_test->dimm_dev[i], nfit_mem); |