From 218e6424e711ceee31eeba93212fed8ee92d6a11 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 26 Jun 2019 21:02:32 +0100 Subject: [PATCH] keys: Garbage collect keys for which the domain has been removed If a key operation domain (such as a network namespace) has been removed then attempt to garbage collect all the keys that use it. Signed-off-by: David Howells --- include/linux/key.h | 2 ++ security/keys/internal.h | 3 ++- security/keys/keyring.c | 15 +++++++++++++++ 3 files changed, 19 insertions(+), 1 deletion(-) diff --git a/include/linux/key.h b/include/linux/key.h index abc6855..60c076c 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -278,6 +278,7 @@ extern void key_revoke(struct key *key); extern void key_invalidate(struct key *key); extern void key_put(struct key *key); extern bool key_put_tag(struct key_tag *tag); +extern void key_remove_domain(struct key_tag *domain_tag); static inline struct key *__key_get(struct key *key) { @@ -446,6 +447,7 @@ extern void key_init(void); #define key_fsgid_changed(c) do { } while(0) #define key_init() do { } while(0) #define key_free_user_ns(ns) do { } while(0) +#define key_remove_domain(d) do { } while(0) #endif /* CONFIG_KEYS */ #endif /* __KERNEL__ */ diff --git a/security/keys/internal.h b/security/keys/internal.h index d3a9439..5a561f5 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -209,7 +209,8 @@ static inline bool key_is_dead(const struct key *key, time64_t limit) return key->flags & ((1 << KEY_FLAG_DEAD) | (1 << KEY_FLAG_INVALIDATED)) || - (key->expiry > 0 && key->expiry <= limit); + (key->expiry > 0 && key->expiry <= limit) || + key->domain_tag->removed; } /* diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 0da8fa2..d3c86fd 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -241,6 +241,21 @@ bool key_put_tag(struct key_tag *tag) return false; } +/** + * key_remove_domain - Kill off a key domain and gc its keys + * @domain_tag: The domain tag to release. + * + * This marks a domain tag as being dead and releases a ref on it. If that + * wasn't the last reference, the garbage collector is poked to try and delete + * all keys that were in the domain. + */ +void key_remove_domain(struct key_tag *domain_tag) +{ + domain_tag->removed = true; + if (!key_put_tag(domain_tag)) + key_schedule_gc_links(); +} + /* * Build the next index key chunk. * -- 2.7.4