/** * eCryptfs: Linux filesystem encryption layer * * Copyright (C) 1997-2003 Erez Zadok * Copyright (C) 2001-2003 Stony Brook University * Copyright (C) 2004-2006 International Business Machines Corp. * Author(s): Michael A. Halcrow * Michael C. Thompson * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #include #include #include #include #include #include #include #include #include "ecryptfs_kernel.h" struct kmem_cache *ecryptfs_inode_info_cache; /** * ecryptfs_alloc_inode - allocate an ecryptfs inode * @sb: Pointer to the ecryptfs super block * * Called to bring an inode into existence. * * Only handle allocation, setting up structures should be done in * ecryptfs_read_inode. This is because the kernel, between now and * then, will 0 out the private data pointer. * * Returns a pointer to a newly allocated inode, NULL otherwise */ static struct inode *ecryptfs_alloc_inode(struct super_block *sb) { struct ecryptfs_inode_info *inode_info; struct inode *inode = NULL; inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL); if (unlikely(!inode_info)) goto out; if (ecryptfs_init_crypt_stat(&inode_info->crypt_stat)) { kmem_cache_free(ecryptfs_inode_info_cache, inode_info); goto out; } mutex_init(&inode_info->lower_file_mutex); atomic_set(&inode_info->lower_file_count, 0); inode_info->lower_file = NULL; inode = &inode_info->vfs_inode; out: return inode; } static void ecryptfs_i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); struct ecryptfs_inode_info *inode_info; inode_info = ecryptfs_inode_to_private(inode); kmem_cache_free(ecryptfs_inode_info_cache, inode_info); } /** * ecryptfs_destroy_inode * @inode: The ecryptfs inode * * This is used during the final destruction of the inode. All * allocation of memory related to the inode, including allocated * memory in the crypt_stat struct, will be released here. * There should be no chance that this deallocation will be missed. */ static void ecryptfs_destroy_inode(struct inode *inode) { struct ecryptfs_inode_info *inode_info; inode_info = ecryptfs_inode_to_private(inode); BUG_ON(inode_info->lower_file); ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat); call_rcu(&inode->i_rcu, ecryptfs_i_callback); } /** * ecryptfs_statfs * @sb: The ecryptfs super block * @buf: The struct kstatfs to fill in with stats * * Get the filesystem statistics. Currently, we let this pass right through * to the lower filesystem and take no action ourselves. */ static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); int rc; if (!lower_dentry->d_sb->s_op->statfs) return -ENOSYS; rc = lower_dentry->d_sb->s_op->statfs(lower_dentry, buf); if (rc) return rc; buf->f_type = ECRYPTFS_SUPER_MAGIC; rc = ecryptfs_set_f_namelen(&buf->f_namelen, buf->f_namelen, &ecryptfs_superblock_to_private(dentry->d_sb)->mount_crypt_stat); return rc; } /** * ecryptfs_evict_inode * @inode - The ecryptfs inode * * Called by iput() when the inode reference count reached zero * and the inode is not hashed anywhere. Used to clear anything * that needs to be, before the inode is completely destroyed and put * on the inode free list. We use this to drop out reference to the * lower inode. */ static void ecryptfs_evict_inode(struct inode *inode) { truncate_inode_pages_final(&inode->i_data); clear_inode(inode); iput(ecryptfs_inode_to_lower(inode)); } /** * ecryptfs_show_options * * Prints the mount options for a given superblock. * Returns zero; does not fail. */ static int ecryptfs_show_options(struct seq_file *m, struct dentry *root) { struct super_block *sb = root->d_sb; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(sb)->mount_crypt_stat; struct ecryptfs_global_auth_tok *walker; mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); list_for_each_entry(walker, &mount_crypt_stat->global_auth_tok_list, mount_crypt_stat_list) { if (walker->flags & ECRYPTFS_AUTH_TOK_FNEK) seq_printf(m, ",ecryptfs_fnek_sig=%s", walker->sig); else seq_printf(m, ",ecryptfs_sig=%s", walker->sig); } mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex); seq_printf(m, ",ecryptfs_cipher=%s", mount_crypt_stat->global_default_cipher_name); if (mount_crypt_stat->global_default_cipher_key_size) seq_printf(m, ",ecryptfs_key_bytes=%zd", mount_crypt_stat->global_default_cipher_key_size); if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) seq_printf(m, ",ecryptfs_passthrough"); if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) seq_printf(m, ",ecryptfs_xattr_metadata"); if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) seq_printf(m, ",ecryptfs_encrypted_view"); if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS) seq_printf(m, ",ecryptfs_unlink_sigs"); if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY) seq_printf(m, ",ecryptfs_mount_auth_tok_only"); return 0; } const struct super_operations ecryptfs_sops = { .alloc_inode = ecryptfs_alloc_inode, .destroy_inode = ecryptfs_destroy_inode, .statfs = ecryptfs_statfs, .remount_fs = NULL, .evict_inode = ecryptfs_evict_inode, .show_options = ecryptfs_show_options }; for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/soc/fsl/pcm030-audio-fabric.c')