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s390/pkey: Introduce new API for random protected key generation

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This patch introduces a new ioctl API and in-kernel API to
generate a random protected key. The protected key is generated
in a way that the effective clear key is never exposed in clear.
Both APIs are described in detail in the header files
arch/s390/include/asm/pkey.h and arch/s390/include/uapi/asm/pkey.h.

Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ingo Franzki
2018-08-23 10:06:26 +02:00
committed by Martin Schwidefsky
parent aa55bf5f02
commit a45a5c7d36
3 changed files with 73 additions and 0 deletions
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8
arch/s390/include/asm/pkey.h
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@@ -109,4 +109,12 @@ int pkey_verifykey(const struct pkey_seckey *seckey,
u16 *pcardnr, u16 *pdomain,
u16 *pkeysize, u32 *pattributes);
/*
* In-kernel API: Generate (AES) random protected key.
* @param keytype one of the PKEY_KEYTYPE values
* @param protkey pointer to buffer receiving the protected key
* @return 0 on success, negative errno value on failure
*/
int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey);
#endif /* _KAPI_PKEY_H */