File libkmod-signature-Fix-crash-when-module-signature-is.patch of Package kmod.10073
From 5336a1d1c0815da3e3b9e57f2ca9d04de3bc65dc Mon Sep 17 00:00:00 2001
From: Michal Suchanek <msuchanek@suse.de>
Date: Thu, 8 Mar 2018 18:30:46 +0100
Subject: [PATCH] libkmod-signature: Fix crash when module signature is not
present.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
libkmod/libkmod-internal.h | 2 +-
libkmod/libkmod-module.c | 21 +++++++++---------
libkmod/libkmod-signature.c | 53 +++++++++++++++++++++++++--------------------
3 files changed, 42 insertions(+), 34 deletions(-)
diff --git a/libkmod/libkmod-internal.h b/libkmod/libkmod-internal.h
index 2ad74c7a33a5..8bc9ecfb906e 100644
--- a/libkmod/libkmod-internal.h
+++ b/libkmod/libkmod-internal.h
@@ -192,5 +192,5 @@ struct kmod_signature_info {
void (*free)(void *);
void *private;
};
-bool kmod_module_signature_info(const struct kmod_file *file, struct kmod_signature_info *sig_info) _must_check_ __attribute__((nonnull(1, 2)));
+struct kmod_signature_info *kmod_module_signature_info(const struct kmod_file *file) _must_check_ __attribute__((nonnull(1)));
void kmod_module_signature_info_free(struct kmod_signature_info *sig_info) __attribute__((nonnull));
diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c
index 7b00d526edec..cbe35819932e 100644
--- a/libkmod/libkmod-module.c
+++ b/libkmod/libkmod-module.c
@@ -2304,7 +2304,7 @@ 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 = NULL;
if (mod == NULL || list == NULL)
return -ENOENT;
@@ -2341,32 +2341,32 @@ KMOD_EXPORT int kmod_module_get_info(const struct kmod_module *mod, struct kmod_
goto list_error;
}
- if (kmod_module_signature_info(mod->file, &sig_info)) {
+ if (sig_info = kmod_module_signature_info(mod->file)) {
struct kmod_list *n;
n = kmod_module_info_append(list, "sig_id", strlen("sig_id"),
- sig_info.id_type, strlen(sig_info.id_type));
+ sig_info->id_type, strlen(sig_info->id_type));
if (n == NULL)
goto list_error;
count++;
n = kmod_module_info_append(list, "signer", strlen("signer"),
- sig_info.signer, sig_info.signer_len);
+ sig_info->signer, sig_info->signer_len);
if (n == NULL)
goto list_error;
count++;
n = kmod_module_info_append_hex(list, "sig_key", strlen("sig_key"),
- sig_info.key_id,
- sig_info.key_id_len);
+ sig_info->key_id,
+ sig_info->key_id_len);
if (n == NULL)
goto list_error;
count++;
n = kmod_module_info_append(list,
"sig_hashalgo", strlen("sig_hashalgo"),
- sig_info.hash_algo, strlen(sig_info.hash_algo));
+ sig_info->hash_algo, strlen(sig_info->hash_algo));
if (n == NULL)
goto list_error;
count++;
@@ -2377,8 +2377,8 @@ KMOD_EXPORT int kmod_module_get_info(const struct kmod_module *mod, struct kmod_
*/
n = kmod_module_info_append_hex(list, "signature",
strlen("signature"),
- sig_info.sig,
- sig_info.sig_len);
+ sig_info->sig,
+ sig_info->sig_len);
if (n == NULL)
goto list_error;
@@ -2389,7 +2389,8 @@ KMOD_EXPORT int kmod_module_get_info(const struct kmod_module *mod, struct kmod_
list_error:
/* aux structures freed in normal case also */
- kmod_module_signature_info_free(&sig_info);
+ if (sig_info)
+ kmod_module_signature_info_free(sig_info);
if (ret < 0) {
kmod_module_info_free_list(*list);
diff --git a/libkmod/libkmod-signature.c b/libkmod/libkmod-signature.c
index bdf84cb14718..fae074e6dd1d 100644
--- a/libkmod/libkmod-signature.c
+++ b/libkmod/libkmod-signature.c
@@ -93,13 +93,17 @@ struct module_signature {
uint32_t sig_len; /* Length of signature data (big endian) */
};
-static bool
+static struct kmod_signature_info *
kmod_module_signature_info_default(const char *mem,
off_t size,
const struct module_signature *modsig,
- size_t sig_len,
- struct kmod_signature_info *sig_info)
+ size_t sig_len)
{
+ struct kmod_signature_info *sig_info = malloc(sizeof *sig_info);
+
+ if (!sig_info)
+ return NULL;
+
size -= sig_len;
sig_info->sig = mem + size;
sig_info->sig_len = sig_len;
@@ -119,7 +123,7 @@ kmod_module_signature_info_default(const char *mem,
sig_info->free = NULL;
sig_info->private = NULL;
- return true;
+ return sig_info;
}
static void kmod_module_signature_info_pkcs7_free(void *s)
@@ -129,13 +133,13 @@ static void kmod_module_signature_info_pkcs7_free(void *s)
pkcs7_free_cert(si->private);
}
-static bool
+static struct kmod_signature_info *
kmod_module_signature_info_pkcs7(const char *mem,
off_t size,
const struct module_signature *modsig,
- size_t sig_len,
- struct kmod_signature_info *sig_info)
+ size_t sig_len)
{
+ struct kmod_signature_info *sig_info = NULL;
const char *pkcs7_raw;
struct pkcs7_cert *cert;
@@ -144,7 +148,13 @@ kmod_module_signature_info_pkcs7(const char *mem,
cert = pkcs7_parse_cert(pkcs7_raw, sig_len);
if (cert == NULL)
- return false;
+ return NULL;
+
+ sig_info = malloc(sizeof *sig_info);
+ if (!sig_info) {
+ free(cert);
+ return NULL;
+ }
sig_info->private = cert;
sig_info->free = kmod_module_signature_info_pkcs7_free;
@@ -162,7 +172,7 @@ kmod_module_signature_info_pkcs7(const char *mem,
sig_info->hash_algo = cert->hash_algo;
sig_info->id_type = pkey_id_type[modsig->id_type];
- return true;
+ return sig_info;
}
#define SIG_MAGIC "~Module signature appended~\n"
@@ -178,48 +188,45 @@ kmod_module_signature_info_pkcs7(const char *mem,
* [ SIG_MAGIC ]
*/
-bool kmod_module_signature_info(const struct kmod_file *file, struct kmod_signature_info *sig_info)
+struct kmod_signature_info *kmod_module_signature_info(const struct kmod_file *file)
{
const char *mem;
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);
if (size < (off_t)strlen(SIG_MAGIC))
- return false;
+ return NULL;
size -= strlen(SIG_MAGIC);
if (memcmp(SIG_MAGIC, mem + size, strlen(SIG_MAGIC)) != 0)
- return false;
+ return NULL;
if (size < (off_t)sizeof(struct module_signature))
- return false;
+ return NULL;
size -= sizeof(struct module_signature);
modsig = (struct module_signature *)(mem + size);
if (modsig->algo >= PKEY_ALGO__LAST ||
modsig->hash >= PKEY_HASH__LAST ||
modsig->id_type >= PKEY_ID_TYPE__LAST)
- return false;
+ return NULL;
sig_len = be32toh(get_unaligned(&modsig->sig_len));
if (sig_len == 0 ||
size < (int64_t)(modsig->signer_len + modsig->key_id_len + sig_len))
- return false;
+ return NULL;
if (modsig->id_type == PKEY_ID_PKCS7)
- ret = kmod_module_signature_info_pkcs7(mem, size,
- modsig, sig_len,
- sig_info);
+ return kmod_module_signature_info_pkcs7(mem, size,
+ modsig, sig_len);
else
- ret = kmod_module_signature_info_default(mem, size,
- modsig, sig_len,
- sig_info);
- return ret;
+ return kmod_module_signature_info_default(mem, size,
+ modsig, sig_len);
}
void kmod_module_signature_info_free(struct kmod_signature_info *sig_info)
{
if (sig_info->free)
sig_info->free(sig_info);
+ free(sig_info);
}
--
2.13.6
