If it is already instantiated tear it down first and then reinstanciate it again with prediction resistance.
Signed-off-by: Michael Walle michael@walle.cc --- drivers/crypto/fsl/desc.h | 2 ++ drivers/crypto/fsl/jobdesc.c | 12 ++++++- drivers/crypto/fsl/jobdesc.h | 2 ++ drivers/crypto/fsl/jr.c | 67 ++++++++++++++++++++++++++++++++---- include/fsl_sec.h | 7 ++-- 5 files changed, 79 insertions(+), 11 deletions(-)
diff --git a/drivers/crypto/fsl/desc.h b/drivers/crypto/fsl/desc.h index 11ad506829..3589e6ea02 100644 --- a/drivers/crypto/fsl/desc.h +++ b/drivers/crypto/fsl/desc.h @@ -520,6 +520,8 @@ #define OP_ALG_ICV_OFF (0 << OP_ALG_ICV_SHIFT) #define OP_ALG_ICV_ON (1 << OP_ALG_ICV_SHIFT)
+#define OP_ALG_PR_ON 0x02 + #define OP_ALG_DIR_SHIFT 0 #define OP_ALG_DIR_MASK 1 #define OP_ALG_DECRYPT 0 diff --git a/drivers/crypto/fsl/jobdesc.c b/drivers/crypto/fsl/jobdesc.c index 6102e9c06b..d9554c550b 100644 --- a/drivers/crypto/fsl/jobdesc.c +++ b/drivers/crypto/fsl/jobdesc.c @@ -266,7 +266,8 @@ void inline_cnstr_jobdesc_rng_instantiation(u32 *desc, int handle, int do_sk)
/* INIT RNG in non-test mode */ append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG | - (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT); + (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT | + OP_ALG_PR_ON);
/* For SH0, Secure Keys must be generated as well */ if (!handle && do_sk) { @@ -286,6 +287,15 @@ void inline_cnstr_jobdesc_rng_instantiation(u32 *desc, int handle, int do_sk) } }
+/* Descriptor for deinstantiation of the RNG block. */ +void inline_cnstr_jobdesc_rng_deinstantiation(u32 *desc, int handle) +{ + init_job_desc(desc, 0); + + append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG | + (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INITFINAL); +} + /* Change key size to bytes form bits in calling function*/ void inline_cnstr_jobdesc_pkha_rsaexp(uint32_t *desc, struct pk_in_params *pkin, uint8_t *out, diff --git a/drivers/crypto/fsl/jobdesc.h b/drivers/crypto/fsl/jobdesc.h index 14b2a119d7..5185ddd535 100644 --- a/drivers/crypto/fsl/jobdesc.h +++ b/drivers/crypto/fsl/jobdesc.h @@ -41,6 +41,8 @@ void inline_cnstr_jobdesc_blob_decap(uint32_t *desc, uint8_t *key_idnfr,
void inline_cnstr_jobdesc_rng_instantiation(u32 *desc, int handle, int do_sk);
+void inline_cnstr_jobdesc_rng_deinstantiation(u32 *desc, int handle); + void inline_cnstr_jobdesc_pkha_rsaexp(uint32_t *desc, struct pk_in_params *pkin, uint8_t *out, uint32_t out_siz); diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c index 42865a6cd7..c5802f7d51 100644 --- a/drivers/crypto/fsl/jr.c +++ b/drivers/crypto/fsl/jr.c @@ -7,6 +7,7 @@
#include <common.h> #include <cpu_func.h> +#include <linux/kernel.h> #include <log.h> #include <malloc.h> #include "fsl_sec.h" @@ -446,6 +447,51 @@ int sec_reset(void) return sec_reset_idx(0); } #ifndef CONFIG_SPL_BUILD +static int deinstantiate_rng(u8 sec_idx, int state_handle_mask) +{ + u32 *desc; + int sh_idx, ret = 0; + int desc_size = ALIGN(sizeof(u32) * 2, ARCH_DMA_MINALIGN); + + desc = memalign(ARCH_DMA_MINALIGN, desc_size); + if (!desc) { + debug("cannot allocate RNG init descriptor memory\n"); + return -ENOMEM; + } + + for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) { + /* + * If the corresponding bit is set, then it means the state + * handle was initialized by us, and thus it needs to be + * deinitialized as well + */ + + if (state_handle_mask & RDSTA_IF(sh_idx)) { + /* + * Create the descriptor for deinstantating this state + * handle. + */ + inline_cnstr_jobdesc_rng_deinstantiation(desc, sh_idx); + flush_dcache_range((unsigned long)desc, + (unsigned long)desc + desc_size); + + ret = run_descriptor_jr_idx(desc, sec_idx); + if (ret) { + printf("SEC%u: RNG4 SH%d deinstantiation failed with error 0x%x\n", + sec_idx, sh_idx, ret); + ret = -EIO; + break; + } + + printf("SEC%u: Deinstantiated RNG4 SH%d\n", + sec_idx, sh_idx); + } + } + + free(desc); + return ret; +} + static int instantiate_rng(u8 sec_idx, int gen_sk) { u32 *desc; @@ -466,9 +512,18 @@ static int instantiate_rng(u8 sec_idx, int gen_sk) * If the corresponding bit is set, this state handle * was initialized by somebody else, so it's left alone. */ - rdsta_val = sec_in32(&rng->rdsta) & RNG_STATE_HANDLE_MASK; - if (rdsta_val & (1 << sh_idx)) - continue; + rdsta_val = sec_in32(&rng->rdsta); + if (rdsta_val & (RDSTA_IF(sh_idx))) { + if (rdsta_val & RDSTA_PR(sh_idx)) + continue; + + printf("SEC%u: RNG4 SH%d was instantiated w/o prediction resistance. Tearing it down\n", + sec_idx, sh_idx); + + ret = deinstantiate_rng(sec_idx, RDSTA_IF(sh_idx)); + if (ret) + break; + }
inline_cnstr_jobdesc_rng_instantiation(desc, sh_idx, gen_sk); size = roundup(sizeof(uint32_t) * 6, ARCH_DMA_MINALIGN); @@ -481,8 +536,8 @@ static int instantiate_rng(u8 sec_idx, int gen_sk) printf("SEC%u: RNG4 SH%d instantiation failed with error 0x%x\n", sec_idx, sh_idx, ret);
- rdsta_val = sec_in32(&rng->rdsta) & RNG_STATE_HANDLE_MASK; - if (!(rdsta_val & (1 << sh_idx))) { + rdsta_val = sec_in32(&rng->rdsta); + if (!(rdsta_val & RDSTA_IF(sh_idx))) { free(desc); return -1; } @@ -554,7 +609,7 @@ static int rng_init(uint8_t sec_idx)
gen_sk = !(sec_in32(&rng->rdsta) & RDSTA_SKVN); do { - inst_handles = sec_in32(&rng->rdsta) & RNG_STATE_HANDLE_MASK; + inst_handles = sec_in32(&rng->rdsta) & RDSTA_MASK;
/* * If either of the SH's were instantiated by somebody else diff --git a/include/fsl_sec.h b/include/fsl_sec.h index 64b8751f2d..1c6f1eb23e 100644 --- a/include/fsl_sec.h +++ b/include/fsl_sec.h @@ -65,10 +65,9 @@ struct rng4tst { u32 rtfreqcnt; /* PRGM=0: freq. count register */ }; u32 rsvd1[40]; -#define RNG_STATE0_HANDLE_INSTANTIATED 0x00000001 -#define RNG_STATE1_HANDLE_INSTANTIATED 0x00000002 -#define RNG_STATE_HANDLE_MASK \ - (RNG_STATE0_HANDLE_INSTANTIATED | RNG_STATE1_HANDLE_INSTANTIATED) +#define RDSTA_IF(idx) (0x00000001 << (idx)) +#define RDSTA_PR(idx) (0x00000010 << (idx)) +#define RDSTA_MASK (RDSTA_PR(1) | RDSTA_PR(0) | RDSTA_IF(1) | RDSTA_IF(0)) #define RDSTA_SKVN 0x40000000 u32 rdsta; /*RNG DRNG Status Register*/ u32 rsvd2[15];