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| author | Dmitry Kasatkin <d.kasatkin@samsung.com> | 2014-03-14 17:44:49 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2014-03-14 17:44:49 +0000 |
| commit | fffea214abf66a8672cfd6697fae65e743e22f11 (patch) | |
| tree | a1e7c6d02c070bf0a92c9650aee2fd7d292f4623 /security/smack/smack_lsm.c | |
| parent | f5895943d91b41b0368830cdb6eaffb8eda0f4c8 (diff) | |
| download | linux-fffea214abf66a8672cfd6697fae65e743e22f11.tar.gz linux-fffea214abf66a8672cfd6697fae65e743e22f11.tar.bz2 linux-fffea214abf66a8672cfd6697fae65e743e22f11.zip | |
smack: fix key permission verification
For any keyring access type SMACK always used MAY_READWRITE access check.
It prevents reading the key with label "_", which should be allowed for anyone.
This patch changes default access check to MAY_READ and use MAY_READWRITE in only
appropriate cases.
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack/smack_lsm.c')
| -rw-r--r-- | security/smack/smack_lsm.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index c47dd8ca019c..8177e7df8c2d 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3511,6 +3511,7 @@ static int smack_key_permission(key_ref_t key_ref, struct key *keyp; struct smk_audit_info ad; struct smack_known *tkp = smk_of_task(cred->security); + int request = 0; keyp = key_ref_to_ptr(key_ref); if (keyp == NULL) @@ -3531,7 +3532,11 @@ 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 - return smk_access(tkp, keyp->security, MAY_READWRITE, &ad); + if (perm & KEY_NEED_READ) + request = MAY_READ; + if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) + request = MAY_WRITE; + return smk_access(tkp, keyp->security, request, &ad); } #endif /* CONFIG_KEYS */ |