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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 5/7] keys: Make __key_link_begin() handle lockdep nesting From: David Howells To: keyrings@vger.kernel.org Cc: dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 22 May 2019 23:28:38 +0100 Message-ID: <155856411812.10428.4394700002321005951.stgit@warthog.procyon.org.uk> In-Reply-To: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> References: <155856408314.10428.17035328117829912815.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Wed, 22 May 2019 22:28:39 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Make __key_link_begin() handle lockdep nesting for the implementation of key_move() where we have to lock two keyrings. Signed-off-by: David Howells Reviewed-by: James Morris --- security/keys/internal.h | 2 +- security/keys/key.c | 6 +++--- security/keys/keyring.c | 6 +++--- security/keys/request_key.c | 2 +- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/security/keys/internal.h b/security/keys/internal.h index 8f533c81aa8d..93513667ff9a 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -93,7 +93,7 @@ extern wait_queue_head_t request_key_conswq; extern struct key_type *key_type_lookup(const char *type); extern void key_type_put(struct key_type *ktype); -extern int __key_link_begin(struct key *keyring, +extern int __key_link_begin(struct key *keyring, unsigned int lock_nesting, const struct keyring_index_key *index_key, struct assoc_array_edit **_edit); extern int __key_link_check_live_key(struct key *keyring, struct key *key); diff --git a/security/keys/key.c b/security/keys/key.c index 696f1c092c50..e0750bc85b68 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -515,7 +515,7 @@ int key_instantiate_and_link(struct key *key, } if (keyring) { - ret = __key_link_begin(keyring, &key->index_key, &edit); + ret = __key_link_begin(keyring, 0, &key->index_key, &edit); if (ret < 0) goto error; @@ -583,7 +583,7 @@ int key_reject_and_link(struct key *key, if (keyring->restrict_link) return -EPERM; - link_ret = __key_link_begin(keyring, &key->index_key, &edit); + link_ret = __key_link_begin(keyring, 0, &key->index_key, &edit); } mutex_lock(&key_construction_mutex); @@ -860,7 +860,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, } index_key.desc_len = strlen(index_key.description); - ret = __key_link_begin(keyring, &index_key, &edit); + ret = __key_link_begin(keyring, 0, &index_key, &edit); if (ret < 0) { key_ref = ERR_PTR(ret); goto error_free_prep; diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 2cfeeeaa1ffa..cd669f758632 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -1202,7 +1202,7 @@ static int keyring_detect_cycle(struct key *A, struct key *B) /* * Preallocate memory so that a key can be linked into to a keyring. */ -int __key_link_begin(struct key *keyring, +int __key_link_begin(struct key *keyring, unsigned int lock_nesting, const struct keyring_index_key *index_key, struct assoc_array_edit **_edit) __acquires(&keyring->sem) @@ -1219,7 +1219,7 @@ int __key_link_begin(struct key *keyring, if (keyring->type != &key_type_keyring) return -ENOTDIR; - down_write(&keyring->sem); + down_write_nested(&keyring->sem, lock_nesting); ret = -EKEYREVOKED; if (test_bit(KEY_FLAG_REVOKED, &keyring->flags)) @@ -1366,7 +1366,7 @@ int key_link(struct key *keyring, struct key *key) key_check(keyring); key_check(key); - ret = __key_link_begin(keyring, &key->index_key, &edit); + ret = __key_link_begin(keyring, 0, &key->index_key, &edit); if (ret == 0) { kdebug("begun {%d,%d}", keyring->serial, refcount_read(&keyring->usage)); ret = __key_link_check_restriction(keyring, key); diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 1f234b019437..e3653c6f85c6 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -372,7 +372,7 @@ static int construct_alloc_key(struct keyring_search_context *ctx, set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags); if (dest_keyring) { - ret = __key_link_begin(dest_keyring, &ctx->index_key, &edit); + ret = __key_link_begin(dest_keyring, 0, &ctx->index_key, &edit); if (ret < 0) goto link_prealloc_failed; }