From ed0ac5c7ec3763e3261c48e3c5d4b7528b60fd85 Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 20 May 2019 21:51:50 +0100 Subject: keys: Add a keyctl to move a key between keyrings Add a keyctl to atomically move a link to a key from one keyring to another. The key must exist in "from" keyring and a flag can be given to cause the operation to fail if there's a matching key already in the "to" keyring. This can be done with: keyctl(KEYCTL_MOVE, key_serial_t key, key_serial_t from_keyring, key_serial_t to_keyring, unsigned int flags); The key being moved must grant Link permission and both keyrings must grant Write permission. flags should be 0 or KEYCTL_MOVE_EXCL, with the latter preventing displacement of a matching key from the "to" keyring. Signed-off-by: David Howells --- include/uapi/linux/keyctl.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/uapi/linux/keyctl.h') diff --git a/include/uapi/linux/keyctl.h b/include/uapi/linux/keyctl.h index f45ee0f69c0c..fd9fb11b312b 100644 --- a/include/uapi/linux/keyctl.h +++ b/include/uapi/linux/keyctl.h @@ -67,6 +67,7 @@ #define KEYCTL_PKEY_SIGN 27 /* Create a public key signature */ #define KEYCTL_PKEY_VERIFY 28 /* Verify a public key signature */ #define KEYCTL_RESTRICT_KEYRING 29 /* Restrict keys allowed to link to a keyring */ +#define KEYCTL_MOVE 30 /* Move keys between keyrings */ /* keyctl structures */ struct keyctl_dh_params { @@ -112,4 +113,6 @@ struct keyctl_pkey_params { __u32 __spare[7]; }; +#define KEYCTL_MOVE_EXCL 0x00000001 /* Do not displace from the to-keyring */ + #endif /* _LINUX_KEYCTL_H */ -- cgit v1.2.3