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powerpc/ima: Add support to initialize ima policy rules

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PowerNV systems use a Linux-based bootloader, which rely on the IMA
subsystem to enforce different secure boot modes. Since the
verification policy may differ based on the secure boot mode of the
system, the policies must be defined at runtime.

This patch implements arch-specific support to define IMA policy rules
based on the runtime secure boot mode of the system.

This patch provides arch-specific IMA policies if PPC_SECURE_BOOT
config is enabled.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1572492694-6520-3-git-send-email-zohar@linux.ibm.com
This commit is contained in:
Nayna Jain
2019-10-30 23:31:27 -04:00
committed by Michael Ellerman
parent 1a8916ee3a
commit 4238fad366
4 changed files with 47 additions and 2 deletions
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3
include/linux/ima.h
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@@ -29,7 +29,8 @@ extern void ima_kexec_cmdline(const void *buf, int size);
extern void ima_add_kexec_buffer(struct kimage *image);
#endif
#if (defined(CONFIG_X86) && defined(CONFIG_EFI)) || defined(CONFIG_S390)
#if (defined(CONFIG_X86) && defined(CONFIG_EFI)) || defined(CONFIG_S390) \
|| defined(CONFIG_PPC_SECURE_BOOT)
extern bool arch_ima_get_secureboot(void);
extern const char * const *arch_get_ima_policy(void);
#else