[PATCH v12 04/10] KEYS: Move KEY_LOOKUP_ to include/linux/key.h

roberto.sassu
2022-08-18T15:52:39Z

From: Roberto Sassu <roberto.sassu@huawei.com>

In preparation for the patch that introduces the bpf_lookup_user_key() eBPF
kfunc, move KEY_LOOKUP_ definitions to include/linux/key.h, to be able to
validate the kfunc parameters.

Also, introduce key_lookup_flags_check() directly in include/linux/key.h,
to reduce the risk that the check is not in sync with currently defined
flags.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: KP Singh <kpsingh@kernel.org>
---
include/linux/key.h | 11 +++++++++++
security/keys/internal.h | 2 --
2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/linux/key.h b/include/linux/key.h
index 7febc4881363..b5bbae77a9e7 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -88,6 +88,17 @@ enum key_need_perm {
KEY_DEFER_PERM_CHECK, /* Special: permission check is deferred */
};

+#define KEY_LOOKUP_CREATE 0x01
+#define KEY_LOOKUP_PARTIAL 0x02
+
+static inline int key_lookup_flags_check(u64 flags)
+{
+ if (flags & ~(KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL))
+ return -EINVAL;
+
+ return 0;
+}
+
struct seq_file;
struct user_struct;
struct signal_struct;
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 9b9cf3b6fcbb..3c1e7122076b 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -165,8 +165,6 @@ extern struct key *request_key_and_link(struct key_type *type,

extern bool lookup_user_key_possessed(const struct key *key,
const struct key_match_data *match_data);
-#define KEY_LOOKUP_CREATE 0x01
-#define KEY_LOOKUP_PARTIAL 0x02

extern long join_session_keyring(const char *name);
extern void key_change_session_keyring(struct callback_head *twork);
--
2.25.1