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acpi/nfit: Fix command-supported detection 

The _DSM function number validation only happens to succeed when the
generic Linux command number translation corresponds with a
DSM-family-specific function number. This breaks NVDIMM-N
implementations that correctly implement _LSR, _LSW, and _LSI, but do
not happen to publish support for DSM function numbers 4, 5, and 6.

Recall that the support for _LS{I,R,W} family of methods results in the
DIMM being marked as supporting those command numbers at
acpi_nfit_register_dimms() time. The DSM function mask is only used for
ND_CMD_CALL support of non-NVDIMM_FAMILY_INTEL devices.

Fixes: 31eca76ba2 ("nfit, libnvdimm: limited/whitelisted dimm command...")
Cc: <stable@vger.kernel.org>
Link: https://github.com/pmem/ndctl/issues/78
Reported-by: Sujith Pandel <sujith_pandel@dell.com>
Tested-by: Sujith Pandel <sujith_pandel@dell.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2019-01-19 10:55:04 -08:00
parent 5e9e38d0db
commit 11189c1089
1 changed files with 40 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/acpi/nfit/core.c
View File

@ -409,6 +409,32 @@ static bool payload_dumpable(struct nvdimm *nvdimm, unsigned int func)
return true;
}
static int cmd_to_func(struct nfit_mem *nfit_mem, unsigned int cmd,
struct nd_cmd_pkg *call_pkg)
{
if (call_pkg) {
int i;
if (nfit_mem->family != call_pkg->nd_family)
return -ENOTTY;
for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
if (call_pkg->nd_reserved2[i])
return -EINVAL;
return call_pkg->nd_command;
}
/* Linux ND commands == NVDIMM_FAMILY_INTEL function numbers */
if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
return cmd;
/*
* Force function number validation to fail since 0 is never
* published as a valid function in dsm_mask.
*/
return 0;
}
int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
{
@ -422,30 +448,23 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
unsigned long cmd_mask, dsm_mask;
u32 offset, fw_status = 0;
acpi_handle handle;
unsigned int func;
const guid_t *guid;
int rc, i;
int func, rc, i;
if (cmd_rc)
*cmd_rc = -EINVAL;
func = cmd;
if (cmd == ND_CMD_CALL) {
call_pkg = buf;
func = call_pkg->nd_command;
for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
if (call_pkg->nd_reserved2[i])
return -EINVAL;
}
if (nvdimm) {
struct acpi_device *adev = nfit_mem->adev;
if (!adev)
return -ENOTTY;
if (call_pkg && nfit_mem->family != call_pkg->nd_family)
return -ENOTTY;
if (cmd == ND_CMD_CALL)
call_pkg = buf;
func = cmd_to_func(nfit_mem, cmd, call_pkg);
if (func < 0)
return func;
dimm_name = nvdimm_name(nvdimm);
cmd_name = nvdimm_cmd_name(cmd);
cmd_mask = nvdimm_cmd_mask(nvdimm);
@ -456,6 +475,7 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
} else {
struct acpi_device *adev = to_acpi_dev(acpi_desc);
func = cmd;
cmd_name = nvdimm_bus_cmd_name(cmd);
cmd_mask = nd_desc->cmd_mask;
dsm_mask = cmd_mask;
@ -470,7 +490,13 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
return -ENOTTY;
if (!test_bit(cmd, &cmd_mask) || !test_bit(func, &dsm_mask))
/*
* 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))
return -ENOTTY;
else if (!test_bit(cmd, &cmd_mask))
return -ENOTTY;
in_obj.type = ACPI_TYPE_PACKAGE;