Commit c45dabf4 authored by Harald Freudenberger's avatar Harald Freudenberger Committed by Heiko Carstens
Browse files

s390/pkey: Rework CCA pkey handler to use stack for small memory allocs 



There have been some places in the CCA handler code where relatively
small amounts of memory have been allocated an freed at the end
of the function. This code has been reworked to use the stack instead.

Signed-off-by: default avatarHarald Freudenberger <freude@linux.ibm.com>
Reviewed-by: default avatarHolger Dengler <dengler@linux.ibm.com>
Link: https://lore.kernel.org/r/20250424133619.16495-20-freude@linux.ibm.com


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 6fecab9b

drivers/s390/crypto/pkey_cca.c

+10 −33
Original line number Diff line number Diff line
@@ -213,7 +213,7 @@ static int cca_key2protkey(const struct pkey_apqn *apqns, size_t nr_apqns, 
			   u8 *protkey, u32 *protkeylen, u32 *protkeytype)

{

	struct keytoken_header *hdr = (struct keytoken_header *)key;

	struct pkey_apqn *local_apqns = NULL;

	struct pkey_apqn _apqns[MAXAPQNSINLIST];

	int i, rc;



	if (keylen < sizeof(*hdr))
@@ -251,14 +251,10 @@ static int cca_key2protkey(const struct pkey_apqn *apqns, size_t nr_apqns, 
	if (!apqns || (nr_apqns == 1 &&

		       apqns[0].card == 0xFFFF && apqns[0].domain == 0xFFFF)) {

		nr_apqns = MAXAPQNSINLIST;

		local_apqns = kmalloc_array(nr_apqns, sizeof(struct pkey_apqn),

					    GFP_KERNEL);

		if (!local_apqns)

			return -ENOMEM;

		rc = cca_apqns4key(key, keylen, 0, local_apqns, &nr_apqns);

		rc = cca_apqns4key(key, keylen, 0, _apqns, &nr_apqns);

		if (rc)

			goto out;

		apqns = local_apqns;

		apqns = _apqns;

	}



	for (rc = -ENODEV, i = 0; rc && i < nr_apqns; i++) {
@@ -283,7 +279,6 @@ static int cca_key2protkey(const struct pkey_apqn *apqns, size_t nr_apqns, 
	}



out:

	kfree(local_apqns);

	pr_debug("rc=%d\n", rc);

	return rc;

}
@@ -302,7 +297,7 @@ static int cca_gen_key(const struct pkey_apqn *apqns, size_t nr_apqns, 
		       u32 keybitsize, u32 flags,

		       u8 *keybuf, u32 *keybuflen, u32 *_keyinfo)

{

	struct pkey_apqn *local_apqns = NULL;

	struct pkey_apqn _apqns[MAXAPQNSINLIST];

	int i, len, rc;



	/* check keytype, subtype, keybitsize */
@@ -338,15 +333,10 @@ static int cca_gen_key(const struct pkey_apqn *apqns, size_t nr_apqns, 
	if (!apqns || (nr_apqns == 1 &&

		       apqns[0].card == 0xFFFF && apqns[0].domain == 0xFFFF)) {

		nr_apqns = MAXAPQNSINLIST;

		local_apqns = kmalloc_array(nr_apqns, sizeof(struct pkey_apqn),

					    GFP_KERNEL);

		if (!local_apqns)

			return -ENOMEM;

		rc = cca_apqns4type(subtype, NULL, NULL, 0,

				    local_apqns, &nr_apqns);

		rc = cca_apqns4type(subtype, NULL, NULL, 0, _apqns, &nr_apqns);

		if (rc)

			goto out;

		apqns = local_apqns;

		apqns = _apqns;

	}



	for (rc = -ENODEV, i = 0; rc && i < nr_apqns; i++) {
@@ -363,7 +353,6 @@ static int cca_gen_key(const struct pkey_apqn *apqns, size_t nr_apqns, 
	}



out:

	kfree(local_apqns);

	pr_debug("rc=%d\n", rc);

	return rc;

}
@@ -383,7 +372,7 @@ static int cca_clr2key(const struct pkey_apqn *apqns, size_t nr_apqns, 
		       const u8 *clrkey, u32 clrkeylen,

		       u8 *keybuf, u32 *keybuflen, u32 *_keyinfo)

{

	struct pkey_apqn *local_apqns = NULL;

	struct pkey_apqn _apqns[MAXAPQNSINLIST];

	int i, len, rc;



	/* check keytype, subtype, clrkeylen, keybitsize */
@@ -424,15 +413,10 @@ static int cca_clr2key(const struct pkey_apqn *apqns, size_t nr_apqns, 
	if (!apqns || (nr_apqns == 1 &&

		       apqns[0].card == 0xFFFF && apqns[0].domain == 0xFFFF)) {

		nr_apqns = MAXAPQNSINLIST;

		local_apqns = kmalloc_array(nr_apqns, sizeof(struct pkey_apqn),

					    GFP_KERNEL);

		if (!local_apqns)

			return -ENOMEM;

		rc = cca_apqns4type(subtype, NULL, NULL, 0,

				    local_apqns, &nr_apqns);

		rc = cca_apqns4type(subtype, NULL, NULL, 0, _apqns, &nr_apqns);

		if (rc)

			goto out;

		apqns = local_apqns;

		apqns = _apqns;

	}



	for (rc = -ENODEV, i = 0; rc && i < nr_apqns; i++) {
@@ -449,7 +433,6 @@ static int cca_clr2key(const struct pkey_apqn *apqns, size_t nr_apqns, 
	}



out:

	kfree(local_apqns);

	pr_debug("rc=%d\n", rc);

	return rc;

}
@@ -554,8 +537,8 @@ static int cca_slowpath_key2protkey(const struct pkey_apqn *apqns, 
{

	const struct keytoken_header *hdr = (const struct keytoken_header *)key;

	const struct clearkeytoken *t = (const struct clearkeytoken *)key;

	u8 tmpbuf[SECKEYBLOBSIZE]; /* 64 bytes */

	u32 tmplen, keysize = 0;

	u8 *tmpbuf;

	int i, rc;



	if (keylen < sizeof(*hdr))
@@ -567,11 +550,6 @@ static int cca_slowpath_key2protkey(const struct pkey_apqn *apqns, 
	if (!keysize || t->len != keysize)

		return -EINVAL;



	/* alloc tmp key buffer */

	tmpbuf = kmalloc(SECKEYBLOBSIZE, GFP_ATOMIC);

	if (!tmpbuf)

		return -ENOMEM;



	/* try two times in case of failure */

	for (i = 0, rc = -ENODEV; i < 2 && rc; i++) {

		tmplen = SECKEYBLOBSIZE;
@@ -586,7 +564,6 @@ static int cca_slowpath_key2protkey(const struct pkey_apqn *apqns, 
		pr_debug("cca_key2protkey()=%d\n", rc);

	}



	kfree(tmpbuf);

	pr_debug("rc=%d\n", rc);

	return rc;

}