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-rw-r--r--include/linux/key.h1
-rw-r--r--security/keys/key.c6
-rw-r--r--security/keys/keyring.c9
-rw-r--r--security/keys/process_keys.c26
-rw-r--r--security/keys/request_key.c11
5 files changed, 34 insertions, 19 deletions
diff --git a/include/linux/key.h b/include/linux/key.h
index cef3b315ba7c..890699815212 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -264,6 +264,7 @@ extern int key_unlink(struct key *keyring,
extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
const struct cred *cred,
+ key_perm_t perm,
unsigned long flags,
struct key *dest);
diff --git a/security/keys/key.c b/security/keys/key.c
index 50d96d4e06f2..bebeca3a78e4 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -826,13 +826,13 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
/* if the client doesn't provide, decide on the permissions we want */
if (perm == KEY_PERM_UNDEF) {
perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
- perm |= KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_LINK | KEY_USR_SETATTR;
+ perm |= KEY_USR_VIEW;
if (ktype->read)
- perm |= KEY_POS_READ | KEY_USR_READ;
+ perm |= KEY_POS_READ;
if (ktype == &key_type_keyring || ktype->update)
- perm |= KEY_USR_WRITE;
+ perm |= KEY_POS_WRITE;
}
/* allocate a new key */
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 81e7852d281d..cf704a92083f 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -257,17 +257,14 @@ error:
* Allocate a keyring and link into the destination keyring.
*/
struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
- const struct cred *cred, unsigned long flags,
- struct key *dest)
+ const struct cred *cred, key_perm_t perm,
+ unsigned long flags, struct key *dest)
{
struct key *keyring;
int ret;
keyring = key_alloc(&key_type_keyring, description,
- uid, gid, cred,
- (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
- flags);
-
+ uid, gid, cred, perm, flags);
if (!IS_ERR(keyring)) {
ret = key_instantiate_and_link(keyring, NULL, 0, dest, NULL);
if (ret < 0) {
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 9de5dc598276..b58d93892740 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -46,9 +46,11 @@ int install_user_keyrings(void)
struct user_struct *user;
const struct cred *cred;
struct key *uid_keyring, *session_keyring;
+ key_perm_t user_keyring_perm;
char buf[20];
int ret;
+ user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL;
cred = current_cred();
user = cred->user;
@@ -72,8 +74,8 @@ int install_user_keyrings(void)
uid_keyring = find_keyring_by_name(buf, true);
if (IS_ERR(uid_keyring)) {
uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1,
- cred, KEY_ALLOC_IN_QUOTA,
- NULL);
+ cred, user_keyring_perm,
+ KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(uid_keyring)) {
ret = PTR_ERR(uid_keyring);
goto error;
@@ -88,7 +90,8 @@ int install_user_keyrings(void)
if (IS_ERR(session_keyring)) {
session_keyring =
keyring_alloc(buf, user->uid, (gid_t) -1,
- cred, KEY_ALLOC_IN_QUOTA, NULL);
+ cred, user_keyring_perm,
+ KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(session_keyring)) {
ret = PTR_ERR(session_keyring);
goto error_release;
@@ -129,6 +132,7 @@ int install_thread_keyring_to_cred(struct cred *new)
struct key *keyring;
keyring = keyring_alloc("_tid", new->uid, new->gid, new,
+ KEY_POS_ALL | KEY_USR_VIEW,
KEY_ALLOC_QUOTA_OVERRUN, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
@@ -173,8 +177,9 @@ int install_process_keyring_to_cred(struct cred *new)
if (new->process_keyring)
return -EEXIST;
- keyring = keyring_alloc("_pid", new->uid, new->gid,
- new, KEY_ALLOC_QUOTA_OVERRUN, NULL);
+ keyring = keyring_alloc("_pid", new->uid, new->gid, new,
+ KEY_POS_ALL | KEY_USR_VIEW,
+ KEY_ALLOC_QUOTA_OVERRUN, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
@@ -223,8 +228,9 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
if (cred->session_keyring)
flags = KEY_ALLOC_IN_QUOTA;
- keyring = keyring_alloc("_ses", cred->uid, cred->gid,
- cred, flags, NULL);
+ keyring = keyring_alloc("_ses", cred->uid, cred->gid, cred,
+ KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
+ flags, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
} else {
@@ -773,8 +779,10 @@ long join_session_keyring(const char *name)
keyring = find_keyring_by_name(name, false);
if (PTR_ERR(keyring) == -ENOKEY) {
/* not found - try and create a new one */
- keyring = keyring_alloc(name, old->uid, old->gid, old,
- KEY_ALLOC_IN_QUOTA, NULL);
+ keyring = keyring_alloc(
+ name, old->uid, old->gid, old,
+ KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_LINK,
+ KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 275c4f9e4b8c..0ae3a2202771 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -126,6 +126,7 @@ static int call_sbin_request_key(struct key_construction *cons,
cred = get_current_cred();
keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred,
+ KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
KEY_ALLOC_QUOTA_OVERRUN, NULL);
put_cred(cred);
if (IS_ERR(keyring)) {
@@ -347,6 +348,7 @@ static int construct_alloc_key(struct key_type *type,
const struct cred *cred = current_cred();
unsigned long prealloc;
struct key *key;
+ key_perm_t perm;
key_ref_t key_ref;
int ret;
@@ -355,8 +357,15 @@ static int construct_alloc_key(struct key_type *type,
*_key = NULL;
mutex_lock(&user->cons_lock);
+ perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
+ perm |= KEY_USR_VIEW;
+ if (type->read)
+ perm |= KEY_POS_READ;
+ if (type == &key_type_keyring || type->update)
+ perm |= KEY_POS_WRITE;
+
key = key_alloc(type, description, cred->fsuid, cred->fsgid, cred,
- KEY_POS_ALL, flags);
+ perm, flags);
if (IS_ERR(key))
goto alloc_failed;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.