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authorKairui Song <kasong@redhat.com>2019-01-21 12:59:29 +0300
committerMimi Zohar <zohar@linux.ibm.com>2019-02-05 01:34:07 +0300
commit278311e417be60f7caef6fcb12bda4da2711ceff (patch)
treec322d3e96510244468ed35ea2f612dd71f7035ad
parent219a3e8676f3132d27b530c7d2d6bcab89536b57 (diff)
downloadlinux-278311e417be60f7caef6fcb12bda4da2711ceff.tar.xz
kexec, KEYS: Make use of platform keyring for signature verify
This patch allows the kexec_file_load syscall to verify the PE signed kernel image signature based on the preboot keys stored in the .platform keyring, as fall back, if the signature verification failed due to not finding the public key in the secondary or builtin keyrings. This commit adds a VERIFY_USE_PLATFORM_KEYRING similar to previous VERIFY_USE_SECONDARY_KEYRING indicating that verify_pkcs7_signature should verify the signature using platform keyring. Also, decrease the error message log level when verification failed with -ENOKEY, so that if called tried multiple time with different keyring it won't generate extra noises. Signed-off-by: Kairui Song <kasong@redhat.com> Cc: David Howells <dhowells@redhat.com> Acked-by: Dave Young <dyoung@redhat.com> (for kexec_file_load part) [zohar@linux.ibm.com: tweaked the first paragraph of the patch description, and fixed checkpatch warning.] Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
-rw-r--r--arch/x86/kernel/kexec-bzimage64.c14
-rw-r--r--certs/system_keyring.c13
-rw-r--r--include/linux/verification.h1
3 files changed, 24 insertions, 4 deletions
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 278cd07228dd..e1215a600064 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -531,9 +531,17 @@ static int bzImage64_cleanup(void *loader_data)
#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
{
- return verify_pefile_signature(kernel, kernel_len,
- VERIFY_USE_SECONDARY_KEYRING,
- VERIFYING_KEXEC_PE_SIGNATURE);
+ int ret;
+
+ ret = verify_pefile_signature(kernel, kernel_len,
+ VERIFY_USE_SECONDARY_KEYRING,
+ VERIFYING_KEXEC_PE_SIGNATURE);
+ if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
+ ret = verify_pefile_signature(kernel, kernel_len,
+ VERIFY_USE_PLATFORM_KEYRING,
+ VERIFYING_KEXEC_PE_SIGNATURE);
+ }
+ return ret;
}
#endif
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index da055e901df4..c05c29ae4d5d 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -240,11 +240,22 @@ int verify_pkcs7_signature(const void *data, size_t len,
#else
trusted_keys = builtin_trusted_keys;
#endif
+ } else if (trusted_keys == VERIFY_USE_PLATFORM_KEYRING) {
+#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
+ trusted_keys = platform_trusted_keys;
+#else
+ trusted_keys = NULL;
+#endif
+ if (!trusted_keys) {
+ ret = -ENOKEY;
+ pr_devel("PKCS#7 platform keyring is not available\n");
+ goto error;
+ }
}
ret = pkcs7_validate_trust(pkcs7, trusted_keys);
if (ret < 0) {
if (ret == -ENOKEY)
- pr_err("PKCS#7 signature not signed with a trusted key\n");
+ pr_devel("PKCS#7 signature not signed with a trusted key\n");
goto error;
}
diff --git a/include/linux/verification.h b/include/linux/verification.h
index cfa4730d607a..018fb5f13d44 100644
--- a/include/linux/verification.h
+++ b/include/linux/verification.h
@@ -17,6 +17,7 @@
* should be used.
*/
#define VERIFY_USE_SECONDARY_KEYRING ((struct key *)1UL)
+#define VERIFY_USE_PLATFORM_KEYRING ((struct key *)2UL)
/*
* The use to which an asymmetric key is being put.