On Mon, Aug 03, 2020 at 04:41:38PM -0600, Jane Chu wrote: > 'security' attribute displays the security state of an nvdimm. > During normal operation, the nvdimm state maybe one of 'disabled', > 'unlocked' or 'locked'. When an admin issues > # ndctl sanitize-dimm nmem0 --overwrite > the attribute is expected to change to 'overwrite' until the overwrite > operation completes. > > But tests on our systems show that 'overwrite' is never shown during > the overwrite operation. i.e. > # cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/nmem0/security > unlocked > the attribute remain 'unlocked' through out the operation, consequently > "ndctl wait-overwrite nmem0" command doesn't wait at all. > > The driver tracks the state in 'nvdimm->sec.flags': when the operation > starts, it adds an overwrite bit to the flags; and when the operation > completes, it removes the bit. Hence security_show() should check the > 'overwrite' bit first, in order to indicate the actual state when multiple > bits are set in the flags. > > Signed-off-by: Jane Chu <[email protected]> > Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Ira Weiny <[email protected]> > --- > drivers/nvdimm/dimm_devs.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c > index b7b77e8..5d72026 100644 > --- a/drivers/nvdimm/dimm_devs.c > +++ b/drivers/nvdimm/dimm_devs.c > @@ -363,14 +363,14 @@ __weak ssize_t security_show(struct device *dev, > { > struct nvdimm *nvdimm = to_nvdimm(dev); > > + if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags)) > + return sprintf(buf, "overwrite\n"); > if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags)) > return sprintf(buf, "disabled\n"); > if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags)) > return sprintf(buf, "unlocked\n"); > if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags)) > return sprintf(buf, "locked\n"); > - if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags)) > - return sprintf(buf, "overwrite\n"); > return -ENOTTY; > } > > -- > 1.8.3.1 >
