| Message ID | 20220819223138.1457091-3-gjoyce@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | generic and PowerPC SED Opal keystore | expand |
LGTM Reviewed-by: Jonathan Derrick <jonathan.derrick@linux.dev> On 8/19/2022 4:31 PM, gjoyce@linux.vnet.ibm.com wrote: > From: Greg Joyce <gjoyce@linux.vnet.ibm.com> > > Define operations for SED Opal to read/write keys > from POWER LPAR Platform KeyStore(PLPKS). This allows > for non-volatile storage of SED Opal keys. > > Signed-off-by: Greg Joyce <gjoyce@linux.vnet.ibm.com> > --- > arch/powerpc/platforms/pseries/Makefile | 1 + > .../powerpc/platforms/pseries/plpks_sed_ops.c | 124 ++++++++++++++++++ > 2 files changed, 125 insertions(+) > create mode 100644 arch/powerpc/platforms/pseries/plpks_sed_ops.c > > diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile > index 14e143b946a3..b7fea9e48a58 100644 > --- a/arch/powerpc/platforms/pseries/Makefile > +++ b/arch/powerpc/platforms/pseries/Makefile > @@ -29,6 +29,7 @@ obj-$(CONFIG_PPC_SPLPAR) += vphn.o > obj-$(CONFIG_PPC_SVM) += svm.o > obj-$(CONFIG_FA_DUMP) += rtas-fadump.o > obj-$(CONFIG_PSERIES_PLPKS) += plpks.o > +obj-$(CONFIG_PSERIES_PLPKS) += plpks_sed_ops.o > > obj-$(CONFIG_SUSPEND) += suspend.o > obj-$(CONFIG_PPC_VAS) += vas.o vas-sysfs.o > diff --git a/arch/powerpc/platforms/pseries/plpks_sed_ops.c b/arch/powerpc/platforms/pseries/plpks_sed_ops.c > new file mode 100644 > index 000000000000..833226738448 > --- /dev/null > +++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c > @@ -0,0 +1,124 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * POWER Platform specific code for non-volatile SED key access > + * Copyright (C) 2022 IBM Corporation > + * > + * Define operations for SED Opal to read/write keys > + * from POWER LPAR Platform KeyStore(PLPKS). > + * > + * Self Encrypting Drives(SED) key storage using PLPKS > + */ > + > +#include <linux/kernel.h> > +#include <linux/slab.h> > +#include <linux/string.h> > +#include <linux/ioctl.h> > +#include <linux/sed-opal-key.h> > +#include "plpks.h" > + > +/* > + * structure that contains all SED data > + */ > +struct plpks_sed_object_data { > + u_char version; > + u_char pad1[7]; > + u_long authority; > + u_long range; > + u_int key_len; > + u_char key[32]; > +}; > + > +#define PLPKS_PLATVAR_POLICY WORLDREADABLE > +#define PLPKS_PLATVAR_OS_COMMON 4 > + > +#define PLPKS_SED_OBJECT_DATA_V0 0 > +#define PLPKS_SED_MANGLED_LABEL "/default/pri" > +#define PLPKS_SED_COMPONENT "sed-opal" > +#define PLPKS_SED_KEY "opal-boot-pin" > + > +/* > + * authority is admin1 and range is global > + */ > +#define PLPKS_SED_AUTHORITY 0x0000000900010001 > +#define PLPKS_SED_RANGE 0x0000080200000001 > + > +void plpks_init_var(struct plpks_var *var, char *keyname) > +{ > + var->name = keyname; > + var->namelen = strlen(keyname); > + if (strcmp(PLPKS_SED_KEY, keyname) == 0) { > + var->name = PLPKS_SED_MANGLED_LABEL; > + var->namelen = strlen(keyname); > + } > + var->policy = PLPKS_PLATVAR_POLICY; > + var->os = PLPKS_PLATVAR_OS_COMMON; > + var->data = NULL; > + var->datalen = 0; > + var->component = PLPKS_SED_COMPONENT; > +} > + > +/* > + * Read the SED Opal key from PLPKS given the label > + */ > +int sed_read_key(char *keyname, char *key, u_int *keylen) > +{ > + struct plpks_var var; > + struct plpks_sed_object_data *data; > + u_int offset = 0; > + int ret; > + > + plpks_init_var(&var, keyname); > + > + offset = offsetof(struct plpks_sed_object_data, key); > + > + ret = plpks_read_os_var(&var); > + if (ret != 0) > + return ret; > + > + if (offset > var.datalen) > + offset = 0; > + > + data = (struct plpks_sed_object_data *)var.data; > + *keylen = be32_to_cpu(data->key_len); > + > + if (var.data) { > + memcpy(key, var.data + offset, var.datalen - offset)> + key[*keylen] = '\0'; > + kfree(var.data); > + } > + > + return 0; > +} > + > +/* > + * Write the SED Opal key to PLPKS given the label > + */ > +int sed_write_key(char *keyname, char *key, u_int keylen) > +{ > + struct plpks_var var; > + struct plpks_sed_object_data data; > + struct plpks_var_name vname; > + > + plpks_init_var(&var, keyname); > + > + var.datalen = sizeof(struct plpks_sed_object_data); > + var.data = (u8 *)&data; > + > + /* initialize SED object */ > + data.version = PLPKS_SED_OBJECT_DATA_V0; > + data.authority = cpu_to_be64(PLPKS_SED_AUTHORITY); > + data.range = cpu_to_be64(PLPKS_SED_RANGE); > + memset(&data.pad1, '\0', sizeof(data.pad1)); > + data.key_len = cpu_to_be32(keylen); > + memcpy(data.key, (char *)key, keylen); > + > + /* > + * Key update requires remove first. The return value > + * is ignored since it's okay if the key doesn't exist. > + */ > + vname.namelen = var.namelen; > + vname.name = var.name; > + plpks_remove_var(var.component, var.os, vname); > + > + return plpks_write_var(var); > +}
> -----Original Message----- > From: gjoyce@linux.vnet.ibm.com <gjoyce@linux.vnet.ibm.com> > Sent: Friday, August 19, 2022 5:32 PM > To: linux-block@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org; jonathan.derrick@linux.dev; > brking@linux.vnet.ibm.com; msuchanek@suse.de; mpe@ellerman.id.au; > nayna@linux.ibm.com; axboe@kernel.dk; akpm@linux-foundation.org; > gjoyce@linux.vnet.ibm.com; linux-efi@vger.kernel.org; > keyrings@vger.kernel.org; dhowells@redhat.com; jarkko@kernel.org > Subject: [PATCH v4 2/3] powerpc/pseries: PLPKS SED Opal keystore support > > +++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c ... > +struct plpks_sed_object_data { > + u_char version; > + u_char pad1[7]; > + u_long authority; > + u_long range; > + u_int key_len; > + u_char key[32]; > +}; ... > +/* > + * Read the SED Opal key from PLPKS given the label > + */ > +int sed_read_key(char *keyname, char *key, u_int *keylen) > +{ ... > + *keylen = be32_to_cpu(data->key_len); > + > + if (var.data) { > + memcpy(key, var.data + offset, var.datalen - offset); > + key[*keylen] = '\0'; Is there a guarantee that key_len is always < sizeof key, or does that need to be checked in more places?
On Fri, 2022-10-07 at 19:09 +0000, Elliott, Robert (Servers) wrote: > > -----Original Message----- > > From: gjoyce@linux.vnet.ibm.com <gjoyce@linux.vnet.ibm.com> > > Sent: Friday, August 19, 2022 5:32 PM > > To: linux-block@vger.kernel.org > > Cc: linuxppc-dev@lists.ozlabs.org; jonathan.derrick@linux.dev; > > brking@linux.vnet.ibm.com; msuchanek@suse.de; mpe@ellerman.id.au; > > nayna@linux.ibm.com; axboe@kernel.dk; akpm@linux-foundation.org; > > gjoyce@linux.vnet.ibm.com; linux-efi@vger.kernel.org; > > keyrings@vger.kernel.org; dhowells@redhat.com; jarkko@kernel.org > > Subject: [PATCH v4 2/3] powerpc/pseries: PLPKS SED Opal keystore > > support > > > > +++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c > ... > > +struct plpks_sed_object_data { > > + u_char version; > > + u_char pad1[7]; > > + u_long authority; > > + u_long range; > > + u_int key_len; > > + u_char key[32]; > > +}; > ... > > +/* > > + * Read the SED Opal key from PLPKS given the label > > + */ > > +int sed_read_key(char *keyname, char *key, u_int *keylen) > > +{ > ... > > + *keylen = be32_to_cpu(data->key_len); > > + > > + if (var.data) { > > + memcpy(key, var.data + offset, var.datalen - offset); > > + key[*keylen] = '\0'; > > Is there a guarantee that key_len is always < sizeof key, or > does that need to be checked in more places? Changed keylen paramter to be the maximum size that it copied. This will help avoid buffer overwrite.
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index 14e143b946a3..b7fea9e48a58 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_PPC_SPLPAR) += vphn.o obj-$(CONFIG_PPC_SVM) += svm.o obj-$(CONFIG_FA_DUMP) += rtas-fadump.o obj-$(CONFIG_PSERIES_PLPKS) += plpks.o +obj-$(CONFIG_PSERIES_PLPKS) += plpks_sed_ops.o obj-$(CONFIG_SUSPEND) += suspend.o obj-$(CONFIG_PPC_VAS) += vas.o vas-sysfs.o diff --git a/arch/powerpc/platforms/pseries/plpks_sed_ops.c b/arch/powerpc/platforms/pseries/plpks_sed_ops.c new file mode 100644 index 000000000000..833226738448 --- /dev/null +++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c @@ -0,0 +1,124 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * POWER Platform specific code for non-volatile SED key access + * Copyright (C) 2022 IBM Corporation + * + * Define operations for SED Opal to read/write keys + * from POWER LPAR Platform KeyStore(PLPKS). + * + * Self Encrypting Drives(SED) key storage using PLPKS + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/ioctl.h> +#include <linux/sed-opal-key.h> +#include "plpks.h" + +/* + * structure that contains all SED data + */ +struct plpks_sed_object_data { + u_char version; + u_char pad1[7]; + u_long authority; + u_long range; + u_int key_len; + u_char key[32]; +}; + +#define PLPKS_PLATVAR_POLICY WORLDREADABLE +#define PLPKS_PLATVAR_OS_COMMON 4 + +#define PLPKS_SED_OBJECT_DATA_V0 0 +#define PLPKS_SED_MANGLED_LABEL "/default/pri" +#define PLPKS_SED_COMPONENT "sed-opal" +#define PLPKS_SED_KEY "opal-boot-pin" + +/* + * authority is admin1 and range is global + */ +#define PLPKS_SED_AUTHORITY 0x0000000900010001 +#define PLPKS_SED_RANGE 0x0000080200000001 + +void plpks_init_var(struct plpks_var *var, char *keyname) +{ + var->name = keyname; + var->namelen = strlen(keyname); + if (strcmp(PLPKS_SED_KEY, keyname) == 0) { + var->name = PLPKS_SED_MANGLED_LABEL; + var->namelen = strlen(keyname); + } + var->policy = PLPKS_PLATVAR_POLICY; + var->os = PLPKS_PLATVAR_OS_COMMON; + var->data = NULL; + var->datalen = 0; + var->component = PLPKS_SED_COMPONENT; +} + +/* + * Read the SED Opal key from PLPKS given the label + */ +int sed_read_key(char *keyname, char *key, u_int *keylen) +{ + struct plpks_var var; + struct plpks_sed_object_data *data; + u_int offset = 0; + int ret; + + plpks_init_var(&var, keyname); + + offset = offsetof(struct plpks_sed_object_data, key); + + ret = plpks_read_os_var(&var); + if (ret != 0) + return ret; + + if (offset > var.datalen) + offset = 0; + + data = (struct plpks_sed_object_data *)var.data; + *keylen = be32_to_cpu(data->key_len); + + if (var.data) { + memcpy(key, var.data + offset, var.datalen - offset); + key[*keylen] = '\0'; + kfree(var.data); + } + + return 0; +} + +/* + * Write the SED Opal key to PLPKS given the label + */ +int sed_write_key(char *keyname, char *key, u_int keylen) +{ + struct plpks_var var; + struct plpks_sed_object_data data; + struct plpks_var_name vname; + + plpks_init_var(&var, keyname); + + var.datalen = sizeof(struct plpks_sed_object_data); + var.data = (u8 *)&data; + + /* initialize SED object */ + data.version = PLPKS_SED_OBJECT_DATA_V0; + data.authority = cpu_to_be64(PLPKS_SED_AUTHORITY); + data.range = cpu_to_be64(PLPKS_SED_RANGE); + memset(&data.pad1, '\0', sizeof(data.pad1)); + data.key_len = cpu_to_be32(keylen); + memcpy(data.key, (char *)key, keylen); + + /* + * Key update requires remove first. The return value + * is ignored since it's okay if the key doesn't exist. + */ + vname.namelen = var.namelen; + vname.name = var.name; + plpks_remove_var(var.component, var.os, vname); + + return plpks_write_var(var); +}