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s390/pkey: fix paes selftest failure with paes and pkey static build

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When both the paes and the pkey kernel module are statically build
into the kernel, the paes cipher selftests run before the pkey
kernel module is initialized. So a static variable set in the pkey
init function and used in the pkey_clr2protkey function is not
initialized when the paes cipher's selftests request to call pckmo for
transforming a clear key value into a protected key.

This patch moves the initial setup of the static variable into
the function pck_clr2protkey. So it's possible, to use the function
for transforming a clear to a protected key even before the pkey
init function has been called and the paes selftests may run
successful.

Reported-by: Alexander Egorenkov <Alexander.Egorenkov@ibm.com>
Cc: <stable@vger.kernel.org> # 4.20
Fixes: f822ad2c2c ("s390/pkey: move pckmo subfunction available checks away from module init")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Harald Freudenberger 2020-09-15 11:00:17 +02:00 committed by Heiko Carstens
parent c3d9cdca73
commit 5b35047eb4
1 changed files with 16 additions and 14 deletions
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30
drivers/s390/crypto/pkey_api.c
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@ -35,9 +35,6 @@ MODULE_DESCRIPTION("s390 protected key interface");
#define PROTKEYBLOBBUFSIZE 256 /* protected key buffer size used internal */
#define MAXAPQNSINLIST 64 /* max 64 apqns within a apqn list */
/* mask of available pckmo subfunctions, fetched once at module init */
static cpacf_mask_t pckmo_functions;
/*
* debug feature data and functions
*/
@ -91,6 +88,9 @@ static int pkey_clr2protkey(u32 keytype,
const struct pkey_clrkey *clrkey,
struct pkey_protkey *protkey)
{
/* mask of available pckmo subfunctions */
static cpacf_mask_t pckmo_functions;
long fc;
int keysize;
u8 paramblock[64];
@ -114,11 +114,13 @@ static int pkey_clr2protkey(u32 keytype,
return -EINVAL;
}
/*
* Check if the needed pckmo subfunction is available.
* These subfunctions can be enabled/disabled by customers
* in the LPAR profile or may even change on the fly.
*/
/* Did we already check for PCKMO ? */
if (!pckmo_functions.bytes[0]) {
/* no, so check now */
if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
return -ENODEV;
}
/* check for the pckmo subfunction we need now */
if (!cpacf_test_func(&pckmo_functions, fc)) {
DEBUG_ERR("%s pckmo functions not available\n", __func__);
return -ENODEV;
@ -2058,7 +2060,7 @@ static struct miscdevice pkey_dev = {
*/
static int __init pkey_init(void)
{
cpacf_mask_t kmc_functions;
cpacf_mask_t func_mask;
/*
* The pckmo instruction should be available - even if we don't
@ -2066,15 +2068,15 @@ static int __init pkey_init(void)
* is also the minimum level for the kmc instructions which
* are able to work with protected keys.
*/
if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
if (!cpacf_query(CPACF_PCKMO, &func_mask))
return -ENODEV;
/* check for kmc instructions available */
if (!cpacf_query(CPACF_KMC, &kmc_functions))
if (!cpacf_query(CPACF_KMC, &func_mask))
return -ENODEV;
if (!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256))
if (!cpacf_test_func(&func_mask, CPACF_KMC_PAES_128) ||
!cpacf_test_func(&func_mask, CPACF_KMC_PAES_192) ||
!cpacf_test_func(&func_mask, CPACF_KMC_PAES_256))
return -ENODEV;
pkey_debug_init();