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acpi/nfit: improve bounds checking for 'func'

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The 'func' variable can come from the user in the __nd_ioctl().  If it's
too high then the (1 << func) shift in acpi_nfit_clear_to_send() is
undefined.  In acpi_nfit_ctl() we pass 'func' to test_bit(func, &dsm_mask)
which could result in an out of bounds access.

To fix these issues, I introduced the NVDIMM_CMD_MAX (31) define and
updated nfit_dsm_revid() to use that define as well instead of magic
numbers.

Fixes: 11189c1089 ("acpi/nfit: Fix command-supported detection")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/20200225161927.hvftuq7kjn547fyj@kili.mountain
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Carpenter 2020-02-25 19:20:06 +03:00 committed by Dan Williams
parent c0e71d6020
commit 01091c496f
2 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/acpi/nfit/core.c
View File

@ -360,7 +360,7 @@ static union acpi_object *acpi_label_info(acpi_handle handle)
static u8 nfit_dsm_revid(unsigned family, unsigned func)
{
static const u8 revid_table[NVDIMM_FAMILY_MAX+1][32] = {
static const u8 revid_table[NVDIMM_FAMILY_MAX+1][NVDIMM_CMD_MAX+1] = {
[NVDIMM_FAMILY_INTEL] = {
[NVDIMM_INTEL_GET_MODES] = 2,
[NVDIMM_INTEL_GET_FWINFO] = 2,
@ -386,7 +386,7 @@ static u8 nfit_dsm_revid(unsigned family, unsigned func)
if (family > NVDIMM_FAMILY_MAX)
return 0;
if (func > 31)
if (func > NVDIMM_CMD_MAX)
return 0;
id = revid_table[family][func];
if (id == 0)
@ -492,7 +492,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
* Check for a valid command. For ND_CMD_CALL, we also have to
* make sure that the DSM function is supported.
*/
if (cmd == ND_CMD_CALL && !test_bit(func, &dsm_mask))
if (cmd == ND_CMD_CALL &&
(func > NVDIMM_CMD_MAX || !test_bit(func, &dsm_mask)))
return -ENOTTY;
else if (!test_bit(cmd, &cmd_mask))
return -ENOTTY;
@ -3492,7 +3493,8 @@ static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
if (nvdimm && cmd == ND_CMD_CALL &&
call_pkg->nd_family == NVDIMM_FAMILY_INTEL) {
func = call_pkg->nd_command;
if ((1 << func) & NVDIMM_INTEL_SECURITY_CMDMASK)
if (func > NVDIMM_CMD_MAX ||
(1 << func) & NVDIMM_INTEL_SECURITY_CMDMASK)
return -EOPNOTSUPP;
}

1
drivers/acpi/nfit/nfit.h
View File

@ -34,6 +34,7 @@
| ACPI_NFIT_MEM_NOT_ARMED | ACPI_NFIT_MEM_MAP_FAILED)
#define NVDIMM_FAMILY_MAX NVDIMM_FAMILY_HYPERV
#define NVDIMM_CMD_MAX 31
#define NVDIMM_STANDARD_CMDMASK \
(1 << ND_CMD_SMART | 1 << ND_CMD_SMART_THRESHOLD | 1 << ND_CMD_DIMM_FLAGS \