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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/powerpc/kernel/ima_arch.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/kernel/ima_arch.c')
-rw-r--r-- | arch/powerpc/kernel/ima_arch.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ima_arch.c b/arch/powerpc/kernel/ima_arch.c new file mode 100644 index 0000000000..b7029beed8 --- /dev/null +++ b/arch/powerpc/kernel/ima_arch.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + */ + +#include <linux/ima.h> +#include <asm/secure_boot.h> + +bool arch_ima_get_secureboot(void) +{ + return is_ppc_secureboot_enabled(); +} + +/* + * The "secure_rules" are enabled only on "secureboot" enabled systems. + * These rules verify the file signatures against known good values. + * The "appraise_type=imasig|modsig" option allows the known good signature + * to be stored as an xattr or as an appended signature. + * + * To avoid duplicate signature verification as much as possible, the IMA + * policy rule for module appraisal is added only if CONFIG_MODULE_SIG + * is not enabled. + */ +static const char *const secure_rules[] = { + "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig", +#ifndef CONFIG_MODULE_SIG + "appraise func=MODULE_CHECK appraise_type=imasig|modsig", +#endif + NULL +}; + +/* + * The "trusted_rules" are enabled only on "trustedboot" enabled systems. + * These rules add the kexec kernel image and kernel modules file hashes to + * the IMA measurement list. + */ +static const char *const trusted_rules[] = { + "measure func=KEXEC_KERNEL_CHECK", + "measure func=MODULE_CHECK", + NULL +}; + +/* + * The "secure_and_trusted_rules" contains rules for both the secure boot and + * trusted boot. The "template=ima-modsig" option includes the appended + * signature, when available, in the IMA measurement list. + */ +static const char *const secure_and_trusted_rules[] = { + "measure func=KEXEC_KERNEL_CHECK template=ima-modsig", + "measure func=MODULE_CHECK template=ima-modsig", + "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig", +#ifndef CONFIG_MODULE_SIG + "appraise func=MODULE_CHECK appraise_type=imasig|modsig", +#endif + NULL +}; + +/* + * Returns the relevant IMA arch-specific policies based on the system secure + * boot state. + */ +const char *const *arch_get_ima_policy(void) +{ + if (is_ppc_secureboot_enabled()) { + if (IS_ENABLED(CONFIG_MODULE_SIG)) + set_module_sig_enforced(); + + if (is_ppc_trustedboot_enabled()) + return secure_and_trusted_rules; + else + return secure_rules; + } else if (is_ppc_trustedboot_enabled()) { + return trusted_rules; + } + + return NULL; +} |