| Message ID | 20210312193623.326306-4-russell.h.weight@intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Intel MAX10 BMC Secure Update Driver | expand |
On 3/12/21 11:36 AM, Russ Weight wrote: > Extend the MAX10 BMC Secure Update driver to provide sysfs > files to expose the canceled code signing key (CSK) bit > vectors. These use the standard bitmap list format > (e.g. 1,2-6,9). > > Signed-off-by: Russ Weight <russell.h.weight@intel.com> > Reviewed-by: Tom Rix <trix@redhat.com> > --- > v10: > - Changed the path expressions in the sysfs documentation to > replace the n3000 reference with something more generic to > accomodate other devices that use the same driver. > v9: > - Rebased to 5.12-rc2 next > - Updated Date and KernelVersion in ABI documentation > v8: > - Previously patch 4/6, otherwise no change > v7: > - Updated Date and KernelVersion in ABI documentation > v6: > - Added WARN_ON() call for (size / stride) to ensure > that the proper count is passed to regmap_bulk_read(). > v5: > - No change > v4: > - Moved sysfs files for displaying the code-signing-key (CSK) > cancellation vectors from the FPGA Security Manger class driver > to here. The m10bmc_csk_vector() and m10bmc_csk_cancel_nbits() > functions are removed and the functionality from these functions > is moved into a show_canceled_csk() function for for displaying > the CSK vectors. > - Added ABI documentation for new sysfs entries > v3: > - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_ > - Changed "MAX10 BMC Secure Engine driver" to "MAX10 BMC Secure Update > driver" > - Removed wrapper functions (m10bmc_raw_*, m10bmc_sys_*). The > underlying functions are now called directly. > - Renamed get_csk_vector() to m10bmc_csk_vector() > v2: > - Replaced small function-creation macros for explicit function > declarations. > - Fixed get_csk_vector() function to properly apply the stride > variable in calls to m10bmc_raw_bulk_read() > - Added m10bmc_ prefix to functions in m10bmc_iops structure > --- > .../testing/sysfs-driver-intel-m10-bmc-secure | 24 ++++++++++ > drivers/fpga/intel-m10-bmc-secure.c | 48 +++++++++++++++++++ > 2 files changed, 72 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure > index 598db1116d34..93ad4de9b941 100644 > --- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure > +++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure > @@ -28,6 +28,30 @@ Description: Read only. Returns the root entry hash for the BMC image > underlying device supports it. > Format: "0x%x". > > +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/sr_canceled_csks This is fine. Reviewed-by: Tom Rix <trix@redhat.com> > +Date: April 2021 > +KernelVersion: 5.13 > +Contact: Russ Weight <russell.h.weight@intel.com> > +Description: Read only. Returns a list of indices for canceled code > + signing keys for the static region. The standard bitmap > + list format is used (e.g. "1,2-6,9"). > + > +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/pr_canceled_csks > +Date: April 2021 > +KernelVersion: 5.13 > +Contact: Russ Weight <russell.h.weight@intel.com> > +Description: Read only. Returns a list of indices for canceled code > + signing keys for the partial reconfiguration region. The > + standard bitmap list format is used (e.g. "1,2-6,9"). > + > +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/bmc_canceled_csks > +Date: April 2021 > +KernelVersion: 5.13 > +Contact: Russ Weight <russell.h.weight@intel.com> > +Description: Read only. Returns a list of indices for canceled code > + signing keys for the BMC. The standard bitmap list format > + is used (e.g. "1,2-6,9"). > + > What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/flash_count > Date: April 2021 > KernelVersion: 5.13 > diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c > index ecd63c13cb2d..87e16c146569 100644 > --- a/drivers/fpga/intel-m10-bmc-secure.c > +++ b/drivers/fpga/intel-m10-bmc-secure.c > @@ -79,6 +79,51 @@ DEVICE_ATTR_SEC_REH_RO(bmc, BMC_PROG_MAGIC, BMC_PROG_ADDR, BMC_REH_ADDR); > DEVICE_ATTR_SEC_REH_RO(sr, SR_PROG_MAGIC, SR_PROG_ADDR, SR_REH_ADDR); > DEVICE_ATTR_SEC_REH_RO(pr, PR_PROG_MAGIC, PR_PROG_ADDR, PR_REH_ADDR); > > +#define CSK_BIT_LEN 128U > +#define CSK_32ARRAY_SIZE DIV_ROUND_UP(CSK_BIT_LEN, 32) > + > +static ssize_t > +show_canceled_csk(struct device *dev, u32 addr, char *buf) > +{ > + unsigned int i, stride, size = CSK_32ARRAY_SIZE * sizeof(u32); > + struct m10bmc_sec *sec = dev_get_drvdata(dev); > + DECLARE_BITMAP(csk_map, CSK_BIT_LEN); > + __le32 csk_le32[CSK_32ARRAY_SIZE]; > + u32 csk32[CSK_32ARRAY_SIZE]; > + int ret; > + > + stride = regmap_get_reg_stride(sec->m10bmc->regmap); > + > + WARN_ON(size % stride); > + ret = regmap_bulk_read(sec->m10bmc->regmap, addr, csk_le32, > + size / stride); > + if (ret) { > + dev_err(sec->dev, "failed to read CSK vector: %x cnt %x: %d\n", > + addr, size / stride, ret); > + return ret; > + } > + > + for (i = 0; i < CSK_32ARRAY_SIZE; i++) > + csk32[i] = le32_to_cpu(((csk_le32[i]))); > + > + bitmap_from_arr32(csk_map, csk32, CSK_BIT_LEN); > + bitmap_complement(csk_map, csk_map, CSK_BIT_LEN); > + return bitmap_print_to_pagebuf(1, buf, csk_map, CSK_BIT_LEN); > +} > + > +#define DEVICE_ATTR_SEC_CSK_RO(_name, _addr) \ > +static ssize_t _name##_canceled_csks_show(struct device *dev, \ > + struct device_attribute *attr, \ > + char *buf) \ > +{ return show_canceled_csk(dev, _addr, buf); } \ > +static DEVICE_ATTR_RO(_name##_canceled_csks) > + > +#define CSK_VEC_OFFSET 0x34 > + > +DEVICE_ATTR_SEC_CSK_RO(bmc, BMC_PROG_ADDR + CSK_VEC_OFFSET); > +DEVICE_ATTR_SEC_CSK_RO(sr, SR_PROG_ADDR + CSK_VEC_OFFSET); > +DEVICE_ATTR_SEC_CSK_RO(pr, PR_PROG_ADDR + CSK_VEC_OFFSET); > + > #define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */ > > static ssize_t flash_count_show(struct device *dev, > @@ -119,6 +164,9 @@ static struct attribute *m10bmc_security_attrs[] = { > &dev_attr_bmc_root_entry_hash.attr, > &dev_attr_sr_root_entry_hash.attr, > &dev_attr_pr_root_entry_hash.attr, > + &dev_attr_sr_canceled_csks.attr, > + &dev_attr_pr_canceled_csks.attr, > + &dev_attr_bmc_canceled_csks.attr, > NULL, > }; >
diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure index 598db1116d34..93ad4de9b941 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure +++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure @@ -28,6 +28,30 @@ Description: Read only. Returns the root entry hash for the BMC image underlying device supports it. Format: "0x%x". +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/sr_canceled_csks +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight <russell.h.weight@intel.com> +Description: Read only. Returns a list of indices for canceled code + signing keys for the static region. The standard bitmap + list format is used (e.g. "1,2-6,9"). + +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/pr_canceled_csks +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight <russell.h.weight@intel.com> +Description: Read only. Returns a list of indices for canceled code + signing keys for the partial reconfiguration region. The + standard bitmap list format is used (e.g. "1,2-6,9"). + +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/bmc_canceled_csks +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight <russell.h.weight@intel.com> +Description: Read only. Returns a list of indices for canceled code + signing keys for the BMC. The standard bitmap list format + is used (e.g. "1,2-6,9"). + What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/flash_count Date: April 2021 KernelVersion: 5.13 diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c index ecd63c13cb2d..87e16c146569 100644 --- a/drivers/fpga/intel-m10-bmc-secure.c +++ b/drivers/fpga/intel-m10-bmc-secure.c @@ -79,6 +79,51 @@ DEVICE_ATTR_SEC_REH_RO(bmc, BMC_PROG_MAGIC, BMC_PROG_ADDR, BMC_REH_ADDR); DEVICE_ATTR_SEC_REH_RO(sr, SR_PROG_MAGIC, SR_PROG_ADDR, SR_REH_ADDR); DEVICE_ATTR_SEC_REH_RO(pr, PR_PROG_MAGIC, PR_PROG_ADDR, PR_REH_ADDR); +#define CSK_BIT_LEN 128U +#define CSK_32ARRAY_SIZE DIV_ROUND_UP(CSK_BIT_LEN, 32) + +static ssize_t +show_canceled_csk(struct device *dev, u32 addr, char *buf) +{ + unsigned int i, stride, size = CSK_32ARRAY_SIZE * sizeof(u32); + struct m10bmc_sec *sec = dev_get_drvdata(dev); + DECLARE_BITMAP(csk_map, CSK_BIT_LEN); + __le32 csk_le32[CSK_32ARRAY_SIZE]; + u32 csk32[CSK_32ARRAY_SIZE]; + int ret; + + stride = regmap_get_reg_stride(sec->m10bmc->regmap); + + WARN_ON(size % stride); + ret = regmap_bulk_read(sec->m10bmc->regmap, addr, csk_le32, + size / stride); + if (ret) { + dev_err(sec->dev, "failed to read CSK vector: %x cnt %x: %d\n", + addr, size / stride, ret); + return ret; + } + + for (i = 0; i < CSK_32ARRAY_SIZE; i++) + csk32[i] = le32_to_cpu(((csk_le32[i]))); + + bitmap_from_arr32(csk_map, csk32, CSK_BIT_LEN); + bitmap_complement(csk_map, csk_map, CSK_BIT_LEN); + return bitmap_print_to_pagebuf(1, buf, csk_map, CSK_BIT_LEN); +} + +#define DEVICE_ATTR_SEC_CSK_RO(_name, _addr) \ +static ssize_t _name##_canceled_csks_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ return show_canceled_csk(dev, _addr, buf); } \ +static DEVICE_ATTR_RO(_name##_canceled_csks) + +#define CSK_VEC_OFFSET 0x34 + +DEVICE_ATTR_SEC_CSK_RO(bmc, BMC_PROG_ADDR + CSK_VEC_OFFSET); +DEVICE_ATTR_SEC_CSK_RO(sr, SR_PROG_ADDR + CSK_VEC_OFFSET); +DEVICE_ATTR_SEC_CSK_RO(pr, PR_PROG_ADDR + CSK_VEC_OFFSET); + #define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */ static ssize_t flash_count_show(struct device *dev, @@ -119,6 +164,9 @@ static struct attribute *m10bmc_security_attrs[] = { &dev_attr_bmc_root_entry_hash.attr, &dev_attr_sr_root_entry_hash.attr, &dev_attr_pr_root_entry_hash.attr, + &dev_attr_sr_canceled_csks.attr, + &dev_attr_pr_canceled_csks.attr, + &dev_attr_bmc_canceled_csks.attr, NULL, };