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| author | Coiby Xu <coxu@redhat.com> | 2025-11-19 17:03:25 +0300 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2025-11-19 17:19:42 +0300 |
| commit | c200892b46ba3df3dd210b7117a463ec283600c3 (patch) | |
| tree | f634b8754302ef54bd5e3f22bf5e313a41e95ad3 /include/linux | |
| parent | 43369273518f57b7d56c1cf12d636a809b7bd81b (diff) | |
| download | linux-c200892b46ba3df3dd210b7117a463ec283600c3.tar.xz | |
ima: Access decompressed kernel module to verify appended signature
Currently, when in-kernel module decompression (CONFIG_MODULE_DECOMPRESS)
is enabled, IMA has no way to verify the appended module signature as it
can't decompress the module.
Define a new kernel_read_file_id enumerate READING_MODULE_COMPRESSED so
IMA can calculate the compressed kernel module data hash on
READING_MODULE_COMPRESSED and defer appraising/measuring it until on
READING_MODULE when the module has been decompressed.
Before enabling in-kernel module decompression, a kernel module in
initramfs can still be loaded with ima_policy=secure_boot. So adjust the
kernel module rule in secure_boot policy to allow either an IMA
signature OR an appended signature i.e. to use
"appraise func=MODULE_CHECK appraise_type=imasig|modsig".
Reported-by: Karel Srot <ksrot@redhat.com>
Suggested-by: Mimi Zohar <zohar@linux.ibm.com>
Suggested-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kernel_read_file.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h index 90451e2e12bd..d613a7b4dd35 100644 --- a/include/linux/kernel_read_file.h +++ b/include/linux/kernel_read_file.h @@ -14,6 +14,7 @@ id(KEXEC_INITRAMFS, kexec-initramfs) \ id(POLICY, security-policy) \ id(X509_CERTIFICATE, x509-certificate) \ + id(MODULE_COMPRESSED, kernel-module-compressed) \ id(MAX_ID, ) #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, |