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Revert "apparmor: use SHA-256 library API instead of crypto_shash API" 

This reverts commit e9ed1eb8f6.

Eric has requested that this patch be taken through the libcrypto-next
tree, instead.

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2025-06-30 00:06:22 -07:00
parent aff426f359
commit 37a3741d27
2 changed files with 75 additions and 13 deletions
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3
security/apparmor/Kconfig
View File

@ -59,7 +59,8 @@ config SECURITY_APPARMOR_INTROSPECT_POLICY
config SECURITY_APPARMOR_HASH
bool "Enable introspection of sha256 hashes for loaded profiles"
depends on SECURITY_APPARMOR_INTROSPECT_POLICY
select CRYPTO_LIB_SHA256
select CRYPTO
select CRYPTO_SHA256
default y
help
This option selects whether introspection of loaded policy

85
security/apparmor/crypto.c
View File

@ -11,52 +11,113 @@
* it should be.
*/
#include <crypto/sha2.h>
#include <crypto/hash.h>
#include "include/apparmor.h"
#include "include/crypto.h"
static unsigned int apparmor_hash_size;
static struct crypto_shash *apparmor_tfm;
unsigned int aa_hash_size(void)
{
return SHA256_DIGEST_SIZE;
return apparmor_hash_size;
}
char *aa_calc_hash(void *data, size_t len)
{
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
char *hash;
int error;
hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
if (!apparmor_tfm)
return NULL;
hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
if (!hash)
return ERR_PTR(-ENOMEM);
sha256(data, len, hash);
desc->tfm = apparmor_tfm;
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) data, len);
if (error)
goto fail;
error = crypto_shash_final(desc, hash);
if (error)
goto fail;
return hash;
fail:
kfree(hash);
return ERR_PTR(error);
}
int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
size_t len)
{
struct sha256_state state;
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
int error;
__le32 le32_version = cpu_to_le32(version);
if (!aa_g_hash_policy)
return 0;
profile->hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
if (!apparmor_tfm)
return 0;
profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
if (!profile->hash)
return -ENOMEM;
sha256_init(&state);
sha256_update(&state, (u8 *)&le32_version, 4);
sha256_update(&state, (u8 *)start, len);
sha256_final(&state, profile->hash);
desc->tfm = apparmor_tfm;
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
if (error)
goto fail;
error = crypto_shash_update(desc, (u8 *) start, len);
if (error)
goto fail;
error = crypto_shash_final(desc, profile->hash);
if (error)
goto fail;
return 0;
fail:
kfree(profile->hash);
profile->hash = NULL;
return error;
}
static int __init init_profile_hash(void)
{
if (apparmor_initialized)
aa_info_message("AppArmor sha256 policy hashing enabled");
struct crypto_shash *tfm;
if (!apparmor_initialized)
return 0;
tfm = crypto_alloc_shash("sha256", 0, 0);
if (IS_ERR(tfm)) {
int error = PTR_ERR(tfm);
AA_ERROR("failed to setup profile sha256 hashing: %d\n", error);
return error;
}
apparmor_tfm = tfm;
apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);
aa_info_message("AppArmor sha256 policy hashing enabled");
return 0;
}
late_initcall(init_profile_hash);