diff options
| author | Zoran Markovic | 2018-10-17 16:25:44 -0700 |
|---|---|---|
| committer | Casey Schaufler | 2018-12-03 11:57:55 -0800 |
| commit | 5b841bfab695e3b8ae793172a9ff7990f99cc3e2 (patch) | |
| tree | 5cb5dd112e5f414a1008adef5c5aa061441851af | |
| parent | 26b76320a8a550472bbb8f42257df83fcb8d8df6 (diff) | |
smack: fix access permissions for keyring
Function smack_key_permission() only issues smack requests for the
following operations:
- KEY_NEED_READ (issues MAY_READ)
- KEY_NEED_WRITE (issues MAY_WRITE)
- KEY_NEED_LINK (issues MAY_WRITE)
- KEY_NEED_SETATTR (issues MAY_WRITE)
A blank smack request is issued in all other cases, resulting in
smack access being granted if there is any rule defined between
subject and object, or denied with -EACCES otherwise.
Request MAY_READ access for KEY_NEED_SEARCH and KEY_NEED_VIEW.
Fix the logic in the unlikely case when both MAY_READ and
MAY_WRITE are needed. Validate access permission field for valid
contents.
Signed-off-by: Zoran Markovic <zmarkovic@sierrawireless.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
| -rw-r--r-- | security/smack/smack_lsm.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 81fb4c1631e9..cd720c06b78c 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -4333,6 +4333,12 @@ static int smack_key_permission(key_ref_t key_ref, int request = 0; int rc; + /* + * Validate requested permissions + */ + if (perm & ~KEY_NEED_ALL) + return -EINVAL; + keyp = key_ref_to_ptr(key_ref); if (keyp == NULL) return -EINVAL; @@ -4356,10 +4362,10 @@ static int smack_key_permission(key_ref_t key_ref, ad.a.u.key_struct.key = keyp->serial; ad.a.u.key_struct.key_desc = keyp->description; #endif - if (perm & KEY_NEED_READ) - request = MAY_READ; + if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW)) + request |= MAY_READ; if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) - request = MAY_WRITE; + request |= MAY_WRITE; rc = smk_access(tkp, keyp->security, request, &ad); rc = smk_bu_note("key access", tkp, keyp->security, request, rc); return rc; |