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authorWaiman Long <longman@redhat.com>2020-08-06 23:18:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 11:33:22 -0700
commit453431a54934d917153c65211b2dabf45562ca88 (patch)
treee9672e7fb28f59331ff00fe6197360d703cbd9c3 /security
parent57c720d4144a9c2b88105c3e8f7b0e97e4b5cc93 (diff)
mm, treewide: rename kzfree() to kfree_sensitive()
As said by Linus: A symmetric naming is only helpful if it implies symmetries in use. Otherwise it's actively misleading. In "kzalloc()", the z is meaningful and an important part of what the caller wants. In "kzfree()", the z is actively detrimental, because maybe in the future we really _might_ want to use that "memfill(0xdeadbeef)" or something. The "zero" part of the interface isn't even _relevant_. The main reason that kzfree() exists is to clear sensitive information that should not be leaked to other future users of the same memory objects. Rename kzfree() to kfree_sensitive() to follow the example of the recently added kvfree_sensitive() and make the intention of the API more explicit. In addition, memzero_explicit() is used to clear the memory to make sure that it won't get optimized away by the compiler. The renaming is done by using the command sequence: git grep -w --name-only kzfree |\ xargs sed -i 's/kzfree/kfree_sensitive/' followed by some editing of the kfree_sensitive() kerneldoc and adding a kzfree backward compatibility macro in slab.h. [akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h] [akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more] Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Joe Perches <joe@perches.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: "Jason A . Donenfeld" <Jason@zx2c4.com> Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/domain.c4
-rw-r--r--security/apparmor/include/file.h2
-rw-r--r--security/apparmor/policy.c24
-rw-r--r--security/apparmor/policy_ns.c6
-rw-r--r--security/apparmor/policy_unpack.c14
-rw-r--r--security/keys/big_key.c6
-rw-r--r--security/keys/dh.c14
-rw-r--r--security/keys/encrypted-keys/encrypted.c14
-rw-r--r--security/keys/trusted-keys/trusted_tpm1.c34
-rw-r--r--security/keys/user_defined.c6
10 files changed, 62 insertions, 62 deletions
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 1c898055a476..7b0e13ce7dc7 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -40,8 +40,8 @@ void aa_free_domain_entries(struct aa_domain *domain)
return;
for (i = 0; i < domain->size; i++)
- kzfree(domain->table[i]);
- kzfree(domain->table);
+ kfree_sensitive(domain->table[i]);
+ kfree_sensitive(domain->table);
domain->table = NULL;
}
}
diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h
index aff26fc71407..d4f8948517d9 100644
--- a/security/apparmor/include/file.h
+++ b/security/apparmor/include/file.h
@@ -72,7 +72,7 @@ static inline void aa_free_file_ctx(struct aa_file_ctx *ctx)
{
if (ctx) {
aa_put_label(rcu_access_pointer(ctx->label));
- kzfree(ctx);
+ kfree_sensitive(ctx);
}
}
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index af4f50fda9e3..4c010c9a6af1 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -187,9 +187,9 @@ static void aa_free_data(void *ptr, void *arg)
{
struct aa_data *data = ptr;
- kzfree(data->data);
- kzfree(data->key);
- kzfree(data);
+ kfree_sensitive(data->data);
+ kfree_sensitive(data->key);
+ kfree_sensitive(data);
}
/**
@@ -217,19 +217,19 @@ void aa_free_profile(struct aa_profile *profile)
aa_put_profile(rcu_access_pointer(profile->parent));
aa_put_ns(profile->ns);
- kzfree(profile->rename);
+ kfree_sensitive(profile->rename);
aa_free_file_rules(&profile->file);
aa_free_cap_rules(&profile->caps);
aa_free_rlimit_rules(&profile->rlimits);
for (i = 0; i < profile->xattr_count; i++)
- kzfree(profile->xattrs[i]);
- kzfree(profile->xattrs);
+ kfree_sensitive(profile->xattrs[i]);
+ kfree_sensitive(profile->xattrs);
for (i = 0; i < profile->secmark_count; i++)
- kzfree(profile->secmark[i].label);
- kzfree(profile->secmark);
- kzfree(profile->dirname);
+ kfree_sensitive(profile->secmark[i].label);
+ kfree_sensitive(profile->secmark);
+ kfree_sensitive(profile->dirname);
aa_put_dfa(profile->xmatch);
aa_put_dfa(profile->policy.dfa);
@@ -237,14 +237,14 @@ void aa_free_profile(struct aa_profile *profile)
rht = profile->data;
profile->data = NULL;
rhashtable_free_and_destroy(rht, aa_free_data, NULL);
- kzfree(rht);
+ kfree_sensitive(rht);
}
- kzfree(profile->hash);
+ kfree_sensitive(profile->hash);
aa_put_loaddata(profile->rawdata);
aa_label_destroy(&profile->label);
- kzfree(profile);
+ kfree_sensitive(profile);
}
/**
diff --git a/security/apparmor/policy_ns.c b/security/apparmor/policy_ns.c
index d7ef540027a5..70921d95fb40 100644
--- a/security/apparmor/policy_ns.c
+++ b/security/apparmor/policy_ns.c
@@ -121,9 +121,9 @@ static struct aa_ns *alloc_ns(const char *prefix, const char *name)
return ns;
fail_unconfined:
- kzfree(ns->base.hname);
+ kfree_sensitive(ns->base.hname);
fail_ns:
- kzfree(ns);
+ kfree_sensitive(ns);
return NULL;
}
@@ -145,7 +145,7 @@ void aa_free_ns(struct aa_ns *ns)
ns->unconfined->ns = NULL;
aa_free_profile(ns->unconfined);
- kzfree(ns);
+ kfree_sensitive(ns);
}
/**
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index b67322abcc33..dc345ac93205 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -163,10 +163,10 @@ static void do_loaddata_free(struct work_struct *work)
aa_put_ns(ns);
}
- kzfree(d->hash);
- kzfree(d->name);
+ kfree_sensitive(d->hash);
+ kfree_sensitive(d->name);
kvfree(d->data);
- kzfree(d);
+ kfree_sensitive(d);
}
void aa_loaddata_kref(struct kref *kref)
@@ -894,7 +894,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
while (unpack_strdup(e, &key, NULL)) {
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
- kzfree(key);
+ kfree_sensitive(key);
goto fail;
}
@@ -902,8 +902,8 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
data->size = unpack_blob(e, &data->data, NULL);
data->data = kvmemdup(data->data, data->size);
if (data->size && !data->data) {
- kzfree(data->key);
- kzfree(data);
+ kfree_sensitive(data->key);
+ kfree_sensitive(data);
goto fail;
}
@@ -1037,7 +1037,7 @@ void aa_load_ent_free(struct aa_load_ent *ent)
aa_put_profile(ent->old);
aa_put_profile(ent->new);
kfree(ent->ns_name);
- kzfree(ent);
+ kfree_sensitive(ent);
}
}
diff --git a/security/keys/big_key.c b/security/keys/big_key.c
index dd708e8f13c0..691347dea3c1 100644
--- a/security/keys/big_key.c
+++ b/security/keys/big_key.c
@@ -138,7 +138,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
err_fput:
fput(file);
err_enckey:
- kzfree(enckey);
+ kfree_sensitive(enckey);
error:
memzero_explicit(buf, enclen);
kvfree(buf);
@@ -155,7 +155,7 @@ void big_key_free_preparse(struct key_preparsed_payload *prep)
path_put(path);
}
- kzfree(prep->payload.data[big_key_data]);
+ kfree_sensitive(prep->payload.data[big_key_data]);
}
/*
@@ -187,7 +187,7 @@ void big_key_destroy(struct key *key)
path->mnt = NULL;
path->dentry = NULL;
}
- kzfree(key->payload.data[big_key_data]);
+ kfree_sensitive(key->payload.data[big_key_data]);
key->payload.data[big_key_data] = NULL;
}
diff --git a/security/keys/dh.c b/security/keys/dh.c
index c4c629bb1c03..1abfa70ed6e1 100644
--- a/security/keys/dh.c
+++ b/security/keys/dh.c
@@ -58,9 +58,9 @@ error:
static void dh_free_data(struct dh *dh)
{
- kzfree(dh->key);
- kzfree(dh->p);
- kzfree(dh->g);
+ kfree_sensitive(dh->key);
+ kfree_sensitive(dh->p);
+ kfree_sensitive(dh->g);
}
struct dh_completion {
@@ -126,7 +126,7 @@ static void kdf_dealloc(struct kdf_sdesc *sdesc)
if (sdesc->shash.tfm)
crypto_free_shash(sdesc->shash.tfm);
- kzfree(sdesc);
+ kfree_sensitive(sdesc);
}
/*
@@ -220,7 +220,7 @@ static int keyctl_dh_compute_kdf(struct kdf_sdesc *sdesc,
ret = -EFAULT;
err:
- kzfree(outbuf);
+ kfree_sensitive(outbuf);
return ret;
}
@@ -395,11 +395,11 @@ long __keyctl_dh_compute(struct keyctl_dh_params __user *params,
out6:
kpp_request_free(req);
out5:
- kzfree(outbuf);
+ kfree_sensitive(outbuf);
out4:
crypto_free_kpp(tfm);
out3:
- kzfree(secret);
+ kfree_sensitive(secret);
out2:
dh_free_data(&dh_inputs);
out1:
diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 14cf81d1a30b..deebbf14eeca 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -370,7 +370,7 @@ static int get_derived_key(u8 *derived_key, enum derived_key_type key_type,
master_keylen);
ret = crypto_shash_tfm_digest(hash_tfm, derived_buf, derived_buf_len,
derived_key);
- kzfree(derived_buf);
+ kfree_sensitive(derived_buf);
return ret;
}
@@ -812,13 +812,13 @@ static int encrypted_instantiate(struct key *key,
ret = encrypted_init(epayload, key->description, format, master_desc,
decrypted_datalen, hex_encoded_iv);
if (ret < 0) {
- kzfree(epayload);
+ kfree_sensitive(epayload);
goto out;
}
rcu_assign_keypointer(key, epayload);
out:
- kzfree(datablob);
+ kfree_sensitive(datablob);
return ret;
}
@@ -827,7 +827,7 @@ static void encrypted_rcu_free(struct rcu_head *rcu)
struct encrypted_key_payload *epayload;
epayload = container_of(rcu, struct encrypted_key_payload, rcu);
- kzfree(epayload);
+ kfree_sensitive(epayload);
}
/*
@@ -885,7 +885,7 @@ static int encrypted_update(struct key *key, struct key_preparsed_payload *prep)
rcu_assign_keypointer(key, new_epayload);
call_rcu(&epayload->rcu, encrypted_rcu_free);
out:
- kzfree(buf);
+ kfree_sensitive(buf);
return ret;
}
@@ -946,7 +946,7 @@ static long encrypted_read(const struct key *key, char *buffer,
memzero_explicit(derived_key, sizeof(derived_key));
memcpy(buffer, ascii_buf, asciiblob_len);
- kzfree(ascii_buf);
+ kfree_sensitive(ascii_buf);
return asciiblob_len;
out:
@@ -961,7 +961,7 @@ out:
*/
static void encrypted_destroy(struct key *key)
{
- kzfree(key->payload.data[0]);
+ kfree_sensitive(key->payload.data[0]);
}
struct key_type key_type_encrypted = {
diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index 8001ab07e63b..b9fe02e5f84f 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -68,7 +68,7 @@ static int TSS_sha1(const unsigned char *data, unsigned int datalen,
}
ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest);
- kzfree(sdesc);
+ kfree_sensitive(sdesc);
return ret;
}
@@ -112,7 +112,7 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
if (!ret)
ret = crypto_shash_final(&sdesc->shash, digest);
out:
- kzfree(sdesc);
+ kfree_sensitive(sdesc);
return ret;
}
@@ -166,7 +166,7 @@ int TSS_authhmac(unsigned char *digest, const unsigned char *key,
paramdigest, TPM_NONCE_SIZE, h1,
TPM_NONCE_SIZE, h2, 1, &c, 0, 0);
out:
- kzfree(sdesc);
+ kfree_sensitive(sdesc);
return ret;
}
EXPORT_SYMBOL_GPL(TSS_authhmac);
@@ -251,7 +251,7 @@ int TSS_checkhmac1(unsigned char *buffer,
if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE))
ret = -EINVAL;
out:
- kzfree(sdesc);
+ kfree_sensitive(sdesc);
return ret;
}
EXPORT_SYMBOL_GPL(TSS_checkhmac1);
@@ -353,7 +353,7 @@ static int TSS_checkhmac2(unsigned char *buffer,
if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE))
ret = -EINVAL;
out:
- kzfree(sdesc);
+ kfree_sensitive(sdesc);
return ret;
}
@@ -563,7 +563,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
*bloblen = storedsize;
}
out:
- kzfree(td);
+ kfree_sensitive(td);
return ret;
}
@@ -1031,12 +1031,12 @@ static int trusted_instantiate(struct key *key,
if (!ret && options->pcrlock)
ret = pcrlock(options->pcrlock);
out:
- kzfree(datablob);
- kzfree(options);
+ kfree_sensitive(datablob);
+ kfree_sensitive(options);
if (!ret)
rcu_assign_keypointer(key, payload);
else
- kzfree(payload);
+ kfree_sensitive(payload);
return ret;
}
@@ -1045,7 +1045,7 @@ static void trusted_rcu_free(struct rcu_head *rcu)
struct trusted_key_payload *p;
p = container_of(rcu, struct trusted_key_payload, rcu);
- kzfree(p);
+ kfree_sensitive(p);
}
/*
@@ -1087,13 +1087,13 @@ static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
ret = datablob_parse(datablob, new_p, new_o);
if (ret != Opt_update) {
ret = -EINVAL;
- kzfree(new_p);
+ kfree_sensitive(new_p);
goto out;
}
if (!new_o->keyhandle) {
ret = -EINVAL;
- kzfree(new_p);
+ kfree_sensitive(new_p);
goto out;
}
@@ -1107,22 +1107,22 @@ static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
ret = key_seal(new_p, new_o);
if (ret < 0) {
pr_info("trusted_key: key_seal failed (%d)\n", ret);
- kzfree(new_p);
+ kfree_sensitive(new_p);
goto out;
}
if (new_o->pcrlock) {
ret = pcrlock(new_o->pcrlock);
if (ret < 0) {
pr_info("trusted_key: pcrlock failed (%d)\n", ret);
- kzfree(new_p);
+ kfree_sensitive(new_p);
goto out;
}
}
rcu_assign_keypointer(key, new_p);
call_rcu(&p->rcu, trusted_rcu_free);
out:
- kzfree(datablob);
- kzfree(new_o);
+ kfree_sensitive(datablob);
+ kfree_sensitive(new_o);
return ret;
}
@@ -1154,7 +1154,7 @@ static long trusted_read(const struct key *key, char *buffer,
*/
static void trusted_destroy(struct key *key)
{
- kzfree(key->payload.data[0]);
+ kfree_sensitive(key->payload.data[0]);
}
struct key_type key_type_trusted = {
diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 07d4287e9084..749e2a4dcb13 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -82,7 +82,7 @@ EXPORT_SYMBOL_GPL(user_preparse);
*/
void user_free_preparse(struct key_preparsed_payload *prep)
{
- kzfree(prep->payload.data[0]);
+ kfree_sensitive(prep->payload.data[0]);
}
EXPORT_SYMBOL_GPL(user_free_preparse);
@@ -91,7 +91,7 @@ static void user_free_payload_rcu(struct rcu_head *head)
struct user_key_payload *payload;
payload = container_of(head, struct user_key_payload, rcu);
- kzfree(payload);
+ kfree_sensitive(payload);
}
/*
@@ -147,7 +147,7 @@ void user_destroy(struct key *key)
{
struct user_key_payload *upayload = key->payload.data[0];
- kzfree(upayload);
+ kfree_sensitive(upayload);
}
EXPORT_SYMBOL_GPL(user_destroy);