when PKC#7 signing method is used the old structure doesn't contain
any useful data, but the data are encoded in the certificate.
The info getting/showing code is not aware of that at the moment and
since 0 is a valid constant, shows, for example, wrong "md4" for the
hash algo.
The patch splits the 2 mothods of gethering the info and reports
"unknown" for the algo.
Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxxx>
---
libkmod/libkmod-module.c | 2 +-
libkmod/libkmod-signature.c | 59 ++++++++++++++++++++++++++-----------
2 files changed, 42 insertions(+), 19 deletions(-)
---
Changelog:
v1 -> v2:
changed helper names to verb form.
diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c
index ee420f4ec2bf..889f26479a98 100644
--- a/libkmod/libkmod-module.c
+++ b/libkmod/libkmod-module.c
@@ -2273,7 +2273,7 @@ KMOD_EXPORT int kmod_module_get_info(const struct kmod_module *mod, struct kmod_
struct kmod_elf *elf;
char **strings;
int i, count, ret = -ENOMEM;
- struct kmod_signature_info sig_info;
+ struct kmod_signature_info sig_info = {};
if (mod == NULL || list == NULL)
return -ENOENT;
diff --git a/libkmod/libkmod-signature.c b/libkmod/libkmod-signature.c
index 1f3e26dea203..13c426ace901 100644
--- a/libkmod/libkmod-signature.c
+++ b/libkmod/libkmod-signature.c
@@ -92,6 +92,38 @@ struct module_signature {
uint32_t sig_len; /* Length of signature data (big endian) */
};
+static bool fill_default(const char *mem, off_t size,
+ const struct module_signature *modsig, size_t sig_len,
+ struct kmod_signature_info *sig_info)
+{
+ size -= sig_len;
+ sig_info->sig = mem + size;
+ sig_info->sig_len = sig_len;
+
+ size -= modsig->key_id_len;
+ sig_info->key_id = mem + size;
+ sig_info->key_id_len = modsig->key_id_len;
+
+ size -= modsig->signer_len;
+ sig_info->signer = mem + size;
+ sig_info->signer_len = modsig->signer_len;
+
+ sig_info->algo = pkey_algo[modsig->algo];
+ sig_info->hash_algo = pkey_hash_algo[modsig->hash];
+ sig_info->id_type = pkey_id_type[modsig->id_type];
+
+ return true;
+}
+
+static bool fill_unknown(const char *mem, off_t size,
+ const struct module_signature *modsig, size_t sig_len,
+ struct kmod_signature_info *sig_info)
+{
+ sig_info->hash_algo = "unknown";
+ sig_info->id_type = pkey_id_type[modsig->id_type];
+ return true;
+}
+
#define SIG_MAGIC "~Module signature appended~\n"
/*
@@ -111,7 +143,7 @@ bool kmod_module_signature_info(const struct kmod_file *file, struct kmod_signat
off_t size;
const struct module_signature *modsig;
size_t sig_len;
-
+ bool ret;
size = kmod_file_get_size(file);
mem = kmod_file_get_contents(file);
@@ -134,21 +166,12 @@ bool kmod_module_signature_info(const struct kmod_file *file, struct kmod_signat
size < (int64_t)(modsig->signer_len + modsig->key_id_len + sig_len))
return false;
- size -= sig_len;
- sig_info->sig = mem + size;
- sig_info->sig_len = sig_len;
-
- size -= modsig->key_id_len;
- sig_info->key_id = mem + size;
- sig_info->key_id_len = modsig->key_id_len;
-
- size -= modsig->signer_len;
- sig_info->signer = mem + size;
- sig_info->signer_len = modsig->signer_len;
-
- sig_info->algo = pkey_algo[modsig->algo];
- sig_info->hash_algo = pkey_hash_algo[modsig->hash];
- sig_info->id_type = pkey_id_type[modsig->id_type];
-
- return true;
+ switch (modsig->id_type) {
+ case PKEY_ID_PKCS7:
+ ret = fill_unknown(mem, size, modsig, sig_len, sig_info);
+ break;
+ default:
+ ret = fill_default(mem, size, modsig, sig_len, sig_info);
+ }
+ return ret;
}
--
2.19.1
