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IMA: fix measuring asymmetric keys Kconfig

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As a result of the asymmetric public keys subtype Kconfig option being
defined as tristate, with the existing IMA Makefile, ima_asymmetric_keys.c
could be built as a kernel module.  To prevent this from happening, this
patch defines and uses an intermediate Kconfig boolean option named
IMA_MEASURE_ASYMMETRIC_KEYS.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: James.Bottomley <James.Bottomley@HansenPartnership.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reported-by: kbuild test robot <lkp@intel.com> # ima_asymmetric_keys.c
is built as a kernel module.
Fixes: 88e70da170 ("IMA: Define an IMA hook to measure keys")
Fixes: cb1aa3823c ("KEYS: Call the IMA hook to measure keys")
[zohar@linux.ibm.com: updated patch description]
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Lakshmi Ramasubramanian 2020-01-08 08:05:08 -08:00 committed by Mimi Zohar
parent f47825c694
commit ea78979d30
3 changed files with 9 additions and 3 deletions
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4
include/linux/ima.h
View File

@ -101,7 +101,7 @@ static inline void ima_add_kexec_buffer(struct kimage *image)
{}
#endif
#if defined(CONFIG_IMA) && defined(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
#ifdef CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS
extern void ima_post_key_create_or_update(struct key *keyring,
struct key *key,
const void *payload, size_t plen,
@ -113,7 +113,7 @@ static inline void ima_post_key_create_or_update(struct key *keyring,
size_t plen,
unsigned long flags,
bool create) {}
#endif /* CONFIG_IMA && CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE */
#endif /* CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS */
#ifdef CONFIG_IMA_APPRAISE
extern bool is_ima_appraise_enabled(void);

6
security/integrity/ima/Kconfig
View File

@ -310,3 +310,9 @@ config IMA_APPRAISE_SIGNED_INIT
default n
help
This option requires user-space init to be signed.
config IMA_MEASURE_ASYMMETRIC_KEYS
bool
depends on IMA
depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE=y
default y

2
security/integrity/ima/Makefile
View File

@ -12,4 +12,4 @@ ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
obj-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o
obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += ima_asymmetric_keys.o
obj-$(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) += ima_asymmetric_keys.o