From aa06117f19944573cda0c4bee026c916b5256090 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Wed, 1 Jul 2009 15:48:18 -0700 Subject: eCryptfs: Fix lockdep-reported AB-BA mutex issue Lockdep reports the following valid-looking possible AB-BA deadlock with global_auth_tok_list_mutex and keysig_list_mutex: ecryptfs_new_file_context() -> ecryptfs_copy_mount_wide_sigs_to_inode_sigs() -> mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); -> ecryptfs_add_keysig() -> mutex_lock(&crypt_stat->keysig_list_mutex); vs ecryptfs_generate_key_packet_set() -> mutex_lock(&crypt_stat->keysig_list_mutex); -> ecryptfs_find_global_auth_tok_for_sig() -> mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); ie the two mutexes are taken in opposite orders in the two different code paths. I'm not sure if this is a real bug where two threads could actually hit the two paths in parallel and deadlock, but it at least makes lockdep impossible to use with ecryptfs since this report triggers every time and disables future lockdep reporting. Since ecryptfs_add_keysig() is called only from the single callsite in ecryptfs_copy_mount_wide_sigs_to_inode_sigs(), the simplest fix seems to be to move the lock of keysig_list_mutex back up outside of the where global_auth_tok_list_mutex is taken. This patch does that, and fixes the lockdep report on my system (and ecryptfs still works OK). The full output of lockdep fixed by this patch is: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.31-2-generic #14~rbd2 ------------------------------------------------------- gdm/2640 is trying to acquire lock: (&mount_crypt_stat->global_auth_tok_list_mutex){+.+.+.}, at: [] ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 but task is already holding lock: (&crypt_stat->keysig_list_mutex){+.+.+.}, at: [] ecryptfs_generate_key_packet_set+0x58/0x2b0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&crypt_stat->keysig_list_mutex){+.+.+.}: [] check_prev_add+0x2a7/0x370 [] validate_chain+0x661/0x750 [] __lock_acquire+0x237/0x430 [] lock_acquire+0xa5/0x150 [] __mutex_lock_common+0x4d/0x3d0 [] mutex_lock_nested+0x46/0x60 [] ecryptfs_add_keysig+0x5a/0xb0 [] ecryptfs_copy_mount_wide_sigs_to_inode_sigs+0x59/0xb0 [] ecryptfs_new_file_context+0xa6/0x1a0 [] ecryptfs_initialize_file+0x4a/0x140 [] ecryptfs_create+0x2d/0x60 [] vfs_create+0xb4/0xe0 [] __open_namei_create+0xc4/0x110 [] do_filp_open+0xa01/0xae0 [] do_sys_open+0x69/0x140 [] sys_open+0x20/0x30 [] system_call_fastpath+0x16/0x1b [] 0xffffffffffffffff -> #0 (&mount_crypt_stat->global_auth_tok_list_mutex){+.+.+.}: [] check_prev_add+0x85/0x370 [] validate_chain+0x661/0x750 [] __lock_acquire+0x237/0x430 [] lock_acquire+0xa5/0x150 [] __mutex_lock_common+0x4d/0x3d0 [] mutex_lock_nested+0x46/0x60 [] ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [] ecryptfs_generate_key_packet_set+0x105/0x2b0 [] ecryptfs_write_headers_virt+0xc9/0x120 [] ecryptfs_write_metadata+0xcd/0x200 [] ecryptfs_initialize_file+0x6b/0x140 [] ecryptfs_create+0x2d/0x60 [] vfs_create+0xb4/0xe0 [] __open_namei_create+0xc4/0x110 [] do_filp_open+0xa01/0xae0 [] do_sys_open+0x69/0x140 [] sys_open+0x20/0x30 [] system_call_fastpath+0x16/0x1b [] 0xffffffffffffffff other info that might help us debug this: 2 locks held by gdm/2640: #0: (&sb->s_type->i_mutex_key#11){+.+.+.}, at: [] do_filp_open+0x3cb/0xae0 #1: (&crypt_stat->keysig_list_mutex){+.+.+.}, at: [] ecryptfs_generate_key_packet_set+0x58/0x2b0 stack backtrace: Pid: 2640, comm: gdm Tainted: G C 2.6.31-2-generic #14~rbd2 Call Trace: [] print_circular_bug_tail+0xa8/0xf0 [] check_prev_add+0x85/0x370 [] ? __module_text_address+0x12/0x60 [] validate_chain+0x661/0x750 [] ? print_context_stack+0x85/0x140 [] ? find_usage_backwards+0x38/0x160 [] __lock_acquire+0x237/0x430 [] lock_acquire+0xa5/0x150 [] ? ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [] ? check_usage_backwards+0x0/0xb0 [] __mutex_lock_common+0x4d/0x3d0 [] ? ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [] ? ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [] ? mark_held_locks+0x6c/0xa0 [] ? kmem_cache_alloc+0xfd/0x1a0 [] ? trace_hardirqs_on_caller+0x14d/0x190 [] mutex_lock_nested+0x46/0x60 [] ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [] ecryptfs_generate_key_packet_set+0x105/0x2b0 [] ecryptfs_write_headers_virt+0xc9/0x120 [] ecryptfs_write_metadata+0xcd/0x200 [] ? ecryptfs_init_persistent_file+0x60/0xe0 [] ecryptfs_initialize_file+0x6b/0x140 [] ecryptfs_create+0x2d/0x60 [] vfs_create+0xb4/0xe0 [] __open_namei_create+0xc4/0x110 [] do_filp_open+0xa01/0xae0 [] ? _raw_spin_unlock+0x5e/0xb0 [] ? _spin_unlock+0x2b/0x40 [] ? getname+0x3b/0x240 [] ? alloc_fd+0xfa/0x140 [] do_sys_open+0x69/0x140 [] ? trace_hardirqs_on_thunk+0x3a/0x3f [] sys_open+0x20/0x30 [] system_call_fastpath+0x16/0x1b Signed-off-by: Roland Dreier Signed-off-by: Tyler Hicks --- fs/ecryptfs/crypto.c | 8 +++++--- fs/ecryptfs/keystore.c | 11 ++++------- 2 files changed, 9 insertions(+), 10 deletions(-) (limited to 'fs/ecryptfs') diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index 4610fd6afce..520783b205a 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -923,7 +923,9 @@ static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs( struct ecryptfs_global_auth_tok *global_auth_tok; int rc = 0; + mutex_lock(&crypt_stat->keysig_list_mutex); mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); + list_for_each_entry(global_auth_tok, &mount_crypt_stat->global_auth_tok_list, mount_crypt_stat_list) { @@ -932,13 +934,13 @@ static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs( rc = ecryptfs_add_keysig(crypt_stat, global_auth_tok->sig); if (rc) { printk(KERN_ERR "Error adding keysig; rc = [%d]\n", rc); - mutex_unlock( - &mount_crypt_stat->global_auth_tok_list_mutex); goto out; } } - mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex); + out: + mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex); + mutex_unlock(&crypt_stat->keysig_list_mutex); return rc; } diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c index 259525c9abb..f9965139c43 100644 --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -2366,21 +2366,18 @@ struct kmem_cache *ecryptfs_key_sig_cache; int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig) { struct ecryptfs_key_sig *new_key_sig; - int rc = 0; new_key_sig = kmem_cache_alloc(ecryptfs_key_sig_cache, GFP_KERNEL); if (!new_key_sig) { - rc = -ENOMEM; printk(KERN_ERR "Error allocating from ecryptfs_key_sig_cache\n"); - goto out; + return -ENOMEM; } memcpy(new_key_sig->keysig, sig, ECRYPTFS_SIG_SIZE_HEX); - mutex_lock(&crypt_stat->keysig_list_mutex); + /* Caller must hold keysig_list_mutex */ list_add(&new_key_sig->crypt_stat_list, &crypt_stat->keysig_list); - mutex_unlock(&crypt_stat->keysig_list_mutex); -out: - return rc; + + return 0; } struct kmem_cache *ecryptfs_global_auth_tok_cache; -- cgit v1.2.3