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| author |   Harald Freudenberger <freude@linux.ibm.com> | 2021-01-15 08:56:19 +0100 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2021-01-27 13:00:48 +0100 |
| commit | 1daafea411f36cfa52eb58c2e7f9e2254fd42b28 (patch) | |
| tree | 9f021fede408ef47a1d0988a5cc1782481c539be /arch/s390/crypto | |
| parent | s390/pci: remove superfluous zdev->zbus check (diff) | |
| download | linux-dev-1daafea411f36cfa52eb58c2e7f9e2254fd42b28.tar.xz linux-dev-1daafea411f36cfa52eb58c2e7f9e2254fd42b28.zip | |
s390/crypto: improve retry logic in case of master key change
A master key change on a CCA card may cause an immediately
following request to derive an protected key from a secure
key to fail with error condition 8/2290. The recommendation
from firmware is to retry with 1 second sleep.
So now the low level cca functions return -EAGAIN when this
error condition is seen and the paes retry function will
evaluate the return value. Seeing EAGAIN and running in
process context results in trying to sleep for 1 s now.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/crypto')
| -rw-r--r-- | arch/s390/crypto/paes_s390.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c index f3caeb17c85b..a279b7d23a5e 100644 --- a/arch/s390/crypto/paes_s390.c +++ b/arch/s390/crypto/paes_s390.c @@ -22,6 +22,7 @@ #include <linux/init.h> #include <linux/mutex.h> #include <linux/spinlock.h> +#include <linux/delay.h> #include <crypto/internal/skcipher.h> #include <crypto/xts.h> #include <asm/cpacf.h> @@ -128,6 +129,9 @@ static inline int __paes_keyblob2pkey(struct key_blob *kb, /* try three times in case of failure */ for (i = 0; i < 3; i++) { + if (i > 0 && ret == -EAGAIN && in_task()) + if (msleep_interruptible(1000)) + return -EINTR; ret = pkey_keyblob2pkey(kb->key, kb->keylen, pk); if (ret == 0) break; @@ -138,10 +142,12 @@ static inline int __paes_keyblob2pkey(struct key_blob *kb, static inline int __paes_convert_key(struct s390_paes_ctx *ctx) { + int ret; struct pkey_protkey pkey; - if (__paes_keyblob2pkey(&ctx->kb, &pkey)) - return -EINVAL; + ret = __paes_keyblob2pkey(&ctx->kb, &pkey); + if (ret) + return ret; spin_lock_bh(&ctx->pk_lock); memcpy(&ctx->pk, &pkey, sizeof(pkey)); @@ -169,10 +175,12 @@ static void ecb_paes_exit(struct crypto_skcipher *tfm) static inline int __ecb_paes_set_key(struct s390_paes_ctx *ctx) { + int rc; unsigned long fc; - if (__paes_convert_key(ctx)) - return -EINVAL; + rc = __paes_convert_key(ctx); + if (rc) + return rc; /* Pick the correct function code based on the protected key type */ fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 : @@ -282,10 +290,12 @@ static void cbc_paes_exit(struct crypto_skcipher *tfm) static inline int __cbc_paes_set_key(struct s390_paes_ctx *ctx) { + int rc; unsigned long fc; - if (__paes_convert_key(ctx)) - return -EINVAL; + rc = __paes_convert_key(ctx); + if (rc) + return rc; /* Pick the correct function code based on the protected key type */ fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 : @@ -577,10 +587,12 @@ static void ctr_paes_exit(struct crypto_skcipher *tfm) static inline int __ctr_paes_set_key(struct s390_paes_ctx *ctx) { + int rc; unsigned long fc; - if (__paes_convert_key(ctx)) - return -EINVAL; + rc = __paes_convert_key(ctx); + if (rc) + return rc; /* Pick the correct function code based on the protected key type */ fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 : |