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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-05-05 22:37:07 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-05-05 22:37:07 +0200 |
commit | 7c9e41e0ef7d44a0818a3beec30634f3f588a23d (patch) | |
tree | 636d97f90f92ce7cb92309112c494fa81583aaa5 /fs/cifs | |
parent | Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost (diff) | |
parent | fs/cifs: Fix resource leak (diff) | |
download | linux-7c9e41e0ef7d44a0818a3beec30634f3f588a23d.tar.xz linux-7c9e41e0ef7d44a0818a3beec30634f3f588a23d.zip |
Merge tag '5.13-rc-smb3-part2' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs updates from Steve French:
"Ten CIFS/SMB3 changes - including two marked for stable - including
some important multichannel fixes, as well as support for handle
leases (deferred close) and shutdown support:
- some important multichannel fixes
- support for handle leases (deferred close)
- shutdown support (which is also helpful since it enables multiple
xfstests)
- enable negotiating stronger encryption by default (GCM256)
- improve wireshark debugging by allowing more options for root to
dump decryption keys
SambaXP and the SMB3 Plugfest test event are going on now so I am
expecting more patches over the next few days due to extra testing
(including more multichannel fixes)"
* tag '5.13-rc-smb3-part2' of git://git.samba.org/sfrench/cifs-2.6:
fs/cifs: Fix resource leak
Cifs: Fix kernel oops caused by deferred close for files.
cifs: fix regression when mounting shares with prefix paths
cifs: use echo_interval even when connection not ready.
cifs: detect dead connections only when echoes are enabled.
smb3.1.1: allow dumping keys for multiuser mounts
smb3.1.1: allow dumping GCM256 keys to improve debugging of encrypted shares
cifs: add shutdown support
cifs: Deferred close for files
smb3.1.1: enable negotiating stronger encryption by default
Diffstat (limited to 'fs/cifs')
-rw-r--r-- | fs/cifs/cifs_fs_sb.h | 1 | ||||
-rw-r--r-- | fs/cifs/cifs_ioctl.h | 35 | ||||
-rw-r--r-- | fs/cifs/cifsfs.c | 25 | ||||
-rw-r--r-- | fs/cifs/cifsglob.h | 17 | ||||
-rw-r--r-- | fs/cifs/cifsproto.h | 13 | ||||
-rw-r--r-- | fs/cifs/connect.c | 37 | ||||
-rw-r--r-- | fs/cifs/dir.c | 10 | ||||
-rw-r--r-- | fs/cifs/file.c | 102 | ||||
-rw-r--r-- | fs/cifs/fs_context.c | 5 | ||||
-rw-r--r-- | fs/cifs/inode.c | 27 | ||||
-rw-r--r-- | fs/cifs/ioctl.c | 112 | ||||
-rw-r--r-- | fs/cifs/link.c | 13 | ||||
-rw-r--r-- | fs/cifs/misc.c | 79 | ||||
-rw-r--r-- | fs/cifs/xattr.c | 4 |
14 files changed, 447 insertions, 33 deletions
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index 2a5325a7ae49..9c45b3a82ad9 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -55,6 +55,7 @@ #define CIFS_MOUNT_MODE_FROM_SID 0x10000000 /* retrieve mode from special ACE */ #define CIFS_MOUNT_RO_CACHE 0x20000000 /* assumes share will not change */ #define CIFS_MOUNT_RW_CACHE 0x40000000 /* assumes only client accessing */ +#define CIFS_MOUNT_SHUTDOWN 0x80000000 struct cifs_sb_info { struct rb_root tlink_tree; diff --git a/fs/cifs/cifs_ioctl.h b/fs/cifs/cifs_ioctl.h index 153d5c842a9b..4a97fe12006b 100644 --- a/fs/cifs/cifs_ioctl.h +++ b/fs/cifs/cifs_ioctl.h @@ -57,6 +57,12 @@ struct smb_query_info { /* char buffer[]; */ } __packed; +/* + * Dumping the commonly used 16 byte (e.g. CCM and GCM128) keys still supported + * for backlevel compatibility, but is not sufficient for dumping the less + * frequently used GCM256 (32 byte) keys (see the newer "CIFS_DUMP_FULL_KEY" + * ioctl for dumping decryption info for GCM256 mounts) + */ struct smb3_key_debug_info { __u64 Suid; __u16 cipher_type; @@ -65,6 +71,18 @@ struct smb3_key_debug_info { __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE]; } __packed; +/* + * Dump full key (32 byte encrypt/decrypt keys instead of 16 bytes) + * is needed if GCM256 (stronger encryption) negotiated + */ +struct smb3_full_key_debug_info { + __u64 Suid; + __u16 cipher_type; + __u8 auth_key[16]; /* SMB2_NTLMV2_SESSKEY_SIZE */ + __u8 smb3encryptionkey[32]; /* SMB3_ENC_DEC_KEY_SIZE */ + __u8 smb3decryptionkey[32]; /* SMB3_ENC_DEC_KEY_SIZE */ +} __packed; + struct smb3_notify { __u32 completion_filter; bool watch_tree; @@ -78,3 +96,20 @@ struct smb3_notify { #define CIFS_QUERY_INFO _IOWR(CIFS_IOCTL_MAGIC, 7, struct smb_query_info) #define CIFS_DUMP_KEY _IOWR(CIFS_IOCTL_MAGIC, 8, struct smb3_key_debug_info) #define CIFS_IOC_NOTIFY _IOW(CIFS_IOCTL_MAGIC, 9, struct smb3_notify) +#define CIFS_DUMP_FULL_KEY _IOWR(CIFS_IOCTL_MAGIC, 10, struct smb3_full_key_debug_info) +#define CIFS_IOC_SHUTDOWN _IOR ('X', 125, __u32) + +/* + * Flags for going down operation + */ +#define CIFS_GOING_FLAGS_DEFAULT 0x0 /* going down */ +#define CIFS_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ +#define CIFS_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ + +static inline bool cifs_forced_shutdown(struct cifs_sb_info *sbi) +{ + if (CIFS_MOUNT_SHUTDOWN & sbi->mnt_cifs_flags) + return true; + else + return false; +} diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 5f2c139143a7..d7ea9c5fe0f8 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -75,7 +75,7 @@ bool enable_oplocks = true; bool linuxExtEnabled = true; bool lookupCacheEnabled = true; bool disable_legacy_dialects; /* false by default */ -bool enable_gcm_256; /* false by default, change when more servers support it */ +bool enable_gcm_256 = true; bool require_gcm_256; /* false by default */ unsigned int global_secflags = CIFSSEC_DEF; /* unsigned int ntlmv2_support = 0; */ @@ -133,6 +133,7 @@ struct workqueue_struct *cifsiod_wq; struct workqueue_struct *decrypt_wq; struct workqueue_struct *fileinfo_put_wq; struct workqueue_struct *cifsoplockd_wq; +struct workqueue_struct *deferredclose_wq; __u32 cifs_lock_secret; /* @@ -390,6 +391,8 @@ cifs_alloc_inode(struct super_block *sb) /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */ INIT_LIST_HEAD(&cifs_inode->openFileList); INIT_LIST_HEAD(&cifs_inode->llist); + INIT_LIST_HEAD(&cifs_inode->deferred_closes); + spin_lock_init(&cifs_inode->deferred_lock); return &cifs_inode->vfs_inode; } @@ -860,13 +863,7 @@ cifs_smb3_do_mount(struct file_system_type *fs_type, goto out; } - /* cifs_setup_volume_info->smb3_parse_devname() redups UNC & prepath */ - kfree(cifs_sb->ctx->UNC); - cifs_sb->ctx->UNC = NULL; - kfree(cifs_sb->ctx->prepath); - cifs_sb->ctx->prepath = NULL; - - rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, old_ctx->UNC); + rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL); if (rc) { root = ERR_PTR(rc); goto out; @@ -1637,9 +1634,16 @@ init_cifs(void) goto out_destroy_fileinfo_put_wq; } + deferredclose_wq = alloc_workqueue("deferredclose", + WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); + if (!deferredclose_wq) { + rc = -ENOMEM; + goto out_destroy_cifsoplockd_wq; + } + rc = cifs_fscache_register(); if (rc) - goto out_destroy_cifsoplockd_wq; + goto out_destroy_deferredclose_wq; rc = cifs_init_inodecache(); if (rc) @@ -1707,6 +1711,8 @@ out_destroy_inodecache: cifs_destroy_inodecache(); out_unreg_fscache: cifs_fscache_unregister(); +out_destroy_deferredclose_wq: + destroy_workqueue(deferredclose_wq); out_destroy_cifsoplockd_wq: destroy_workqueue(cifsoplockd_wq); out_destroy_fileinfo_put_wq: @@ -1741,6 +1747,7 @@ exit_cifs(void) cifs_destroy_mids(); cifs_destroy_inodecache(); cifs_fscache_unregister(); + destroy_workqueue(deferredclose_wq); destroy_workqueue(cifsoplockd_wq); destroy_workqueue(decrypt_wq); destroy_workqueue(fileinfo_put_wq); diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index b23a0ee8c6f8..d88b4b523dcc 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1154,6 +1154,14 @@ struct cifs_pending_open { __u32 oplock; }; +struct cifs_deferred_close { + struct list_head dlist; + struct tcon_link *tlink; + __u16 netfid; + __u64 persistent_fid; + __u64 volatile_fid; +}; + /* * This info hangs off the cifsFileInfo structure, pointed to by llist. * This is used to track byte stream locks on the file @@ -1248,6 +1256,9 @@ struct cifsFileInfo { struct cifs_search_info srch_inf; struct work_struct oplock_break; /* work for oplock breaks */ struct work_struct put; /* work for the final part of _put */ + struct delayed_work deferred; + bool oplock_break_received; /* Flag to indicate oplock break */ + bool deferred_scheduled; }; struct cifs_io_parms { @@ -1392,6 +1403,7 @@ struct cifsInodeInfo { #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ +#define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ unsigned long flags; spinlock_t writers_lock; unsigned int writers; /* Number of writers on this inode */ @@ -1404,6 +1416,8 @@ struct cifsInodeInfo { struct fscache_cookie *fscache; #endif struct inode vfs_inode; + struct list_head deferred_closes; /* list of deferred closes */ + spinlock_t deferred_lock; /* protection on deferred list */ }; static inline struct cifsInodeInfo * @@ -1871,11 +1885,14 @@ extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ void cifs_oplock_break(struct work_struct *work); void cifs_queue_oplock_break(struct cifsFileInfo *cfile); +void smb2_deferred_work_close(struct work_struct *work); +extern const struct slow_work_ops cifs_oplock_break_ops; extern struct workqueue_struct *cifsiod_wq; extern struct workqueue_struct *decrypt_wq; extern struct workqueue_struct *fileinfo_put_wq; extern struct workqueue_struct *cifsoplockd_wq; +extern struct workqueue_struct *deferredclose_wq; extern __u32 cifs_lock_secret; extern mempool_t *cifs_mid_poolp; diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index a79d50001fbf..d30cba44ba29 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -267,6 +267,19 @@ extern void cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, struct cifs_pending_open *open); extern void cifs_del_pending_open(struct cifs_pending_open *open); + +extern bool cifs_is_deferred_close(struct cifsFileInfo *cfile, + struct cifs_deferred_close **dclose); + +extern void cifs_add_deferred_close(struct cifsFileInfo *cfile, + struct cifs_deferred_close *dclose); + +extern void cifs_del_deferred_close(struct cifsFileInfo *cfile); + +extern void cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode); + +extern void cifs_close_all_deferred_files(struct cifs_tcon *cifs_tcon); + extern struct TCP_Server_Info *cifs_get_tcp_session(struct smb3_fs_context *ctx); extern void cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect); diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 121d8b4535b0..495c395f9def 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -392,16 +392,6 @@ cifs_echo_request(struct work_struct *work) int rc; struct TCP_Server_Info *server = container_of(work, struct TCP_Server_Info, echo.work); - unsigned long echo_interval; - - /* - * If we need to renegotiate, set echo interval to zero to - * immediately call echo service where we can renegotiate. - */ - if (server->tcpStatus == CifsNeedNegotiate) - echo_interval = 0; - else - echo_interval = server->echo_interval; /* * We cannot send an echo if it is disabled. @@ -412,7 +402,7 @@ cifs_echo_request(struct work_struct *work) server->tcpStatus == CifsExiting || server->tcpStatus == CifsNew || (server->ops->can_echo && !server->ops->can_echo(server)) || - time_before(jiffies, server->lstrp + echo_interval - HZ)) + time_before(jiffies, server->lstrp + server->echo_interval - HZ)) goto requeue_echo; rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS; @@ -476,6 +466,7 @@ server_unresponsive(struct TCP_Server_Info *server) */ if ((server->tcpStatus == CifsGood || server->tcpStatus == CifsNeedNegotiate) && + (!server->ops->can_echo || server->ops->can_echo(server)) && time_after(jiffies, server->lstrp + 3 * server->echo_interval)) { cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n", (3 * server->echo_interval) / HZ); @@ -3158,17 +3149,29 @@ out: int cifs_setup_volume_info(struct smb3_fs_context *ctx, const char *mntopts, const char *devname) { - int rc = 0; + int rc; - smb3_parse_devname(devname, ctx); + if (devname) { + cifs_dbg(FYI, "%s: devname=%s\n", __func__, devname); + rc = smb3_parse_devname(devname, ctx); + if (rc) { + cifs_dbg(VFS, "%s: failed to parse %s: %d\n", __func__, devname, rc); + return rc; + } + } if (mntopts) { char *ip; - cifs_dbg(FYI, "%s: mntopts=%s\n", __func__, mntopts); rc = smb3_parse_opt(mntopts, "ip", &ip); - if (!rc && !cifs_convert_address((struct sockaddr *)&ctx->dstaddr, ip, - strlen(ip))) { + if (rc) { + cifs_dbg(VFS, "%s: failed to parse ip options: %d\n", __func__, rc); + return rc; + } + + rc = cifs_convert_address((struct sockaddr *)&ctx->dstaddr, ip, strlen(ip)); + kfree(ip); + if (!rc) { cifs_dbg(VFS, "%s: failed to convert ip address\n", __func__); return -EINVAL; } @@ -3188,7 +3191,7 @@ cifs_setup_volume_info(struct smb3_fs_context *ctx, const char *mntopts, const c return -EINVAL; } - return rc; + return 0; } static int diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index c85aff838305..6bcd3e8f7cda 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -34,6 +34,7 @@ #include "cifs_fs_sb.h" #include "cifs_unicode.h" #include "fs_context.h" +#include "cifs_ioctl.h" static void renew_parental_timestamps(struct dentry *direntry) @@ -430,6 +431,9 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry, __u32 oplock; struct cifsFileInfo *file_info; + if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) + return -EIO; + /* * Posix open is only called (at lookup time) for file create now. For * opens (rather than creates), because we do not know if it is a file @@ -546,6 +550,9 @@ int cifs_create(struct user_namespace *mnt_userns, struct inode *inode, cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n", inode, direntry, direntry); + if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) + return -EIO; + tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); rc = PTR_ERR(tlink); if (IS_ERR(tlink)) @@ -583,6 +590,9 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode, return -EINVAL; cifs_sb = CIFS_SB(inode->i_sb); + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 639c59596d4f..6caad100c3f3 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -45,6 +45,7 @@ #include "fscache.h" #include "smbdirect.h" #include "fs_context.h" +#include "cifs_ioctl.h" static inline int cifs_convert_flags(unsigned int flags) { @@ -322,9 +323,12 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, cfile->dentry = dget(dentry); cfile->f_flags = file->f_flags; cfile->invalidHandle = false; + cfile->oplock_break_received = false; + cfile->deferred_scheduled = false; cfile->tlink = cifs_get_tlink(tlink); INIT_WORK(&cfile->oplock_break, cifs_oplock_break); INIT_WORK(&cfile->put, cifsFileInfo_put_work); + INIT_DELAYED_WORK(&cfile->deferred, smb2_deferred_work_close); mutex_init(&cfile->fh_mutex); spin_lock_init(&cfile->file_info_lock); @@ -539,6 +543,11 @@ int cifs_open(struct inode *inode, struct file *file) xid = get_xid(); cifs_sb = CIFS_SB(inode->i_sb); + if (unlikely(cifs_forced_shutdown(cifs_sb))) { + free_xid(xid); + return -EIO; + } + tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) { free_xid(xid); @@ -565,6 +574,23 @@ int cifs_open(struct inode *inode, struct file *file) file->f_op = &cifs_file_direct_ops; } + spin_lock(&CIFS_I(inode)->deferred_lock); + /* Get the cached handle as SMB2 close is deferred */ + rc = cifs_get_readable_path(tcon, full_path, &cfile); + if (rc == 0) { + if (file->f_flags == cfile->f_flags) { + file->private_data = cfile; + cifs_del_deferred_close(cfile); + spin_unlock(&CIFS_I(inode)->deferred_lock); + goto out; + } else { + spin_unlock(&CIFS_I(inode)->deferred_lock); + _cifsFileInfo_put(cfile, true, false); + } + } else { + spin_unlock(&CIFS_I(inode)->deferred_lock); + } + if (server->oplocks) oplock = REQ_OPLOCK; else @@ -846,11 +872,56 @@ reopen_error_exit: return rc; } +void smb2_deferred_work_close(struct work_struct *work) +{ + struct cifsFileInfo *cfile = container_of(work, + struct cifsFileInfo, deferred.work); + + spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); + if (!cfile->deferred_scheduled) { + spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); + return; + } + cifs_del_deferred_close(cfile); + cfile->deferred_scheduled = false; + spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); + _cifsFileInfo_put(cfile, true, false); +} + int cifs_close(struct inode *inode, struct file *file) { + struct cifsFileInfo *cfile; + struct cifsInodeInfo *cinode = CIFS_I(inode); + struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); + struct cifs_deferred_close *dclose; + if (file->private_data != NULL) { - _cifsFileInfo_put(file->private_data, true, false); + cfile = file->private_data; file->private_data = NULL; + dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL); + if ((cinode->oplock == CIFS_CACHE_RHW_FLG) && + dclose) { + if (test_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) + inode->i_ctime = inode->i_mtime = current_time(inode); + spin_lock(&cinode->deferred_lock); + cifs_add_deferred_close(cfile, dclose); + if (cfile->deferred_scheduled) { + mod_delayed_work(deferredclose_wq, + &cfile->deferred, cifs_sb->ctx->acregmax); + } else { + /* Deferred close for files */ + queue_delayed_work(deferredclose_wq, + &cfile->deferred, cifs_sb->ctx->acregmax); + cfile->deferred_scheduled = true; + spin_unlock(&cinode->deferred_lock); + return 0; + } + spin_unlock(&cinode->deferred_lock); + _cifsFileInfo_put(cfile, true, false); + } else { + _cifsFileInfo_put(cfile, true, false); + kfree(dclose); + } } /* return code from the ->release op is always ignored */ @@ -1920,8 +1991,10 @@ cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, if (total_written > 0) { spin_lock(&d_inode(dentry)->i_lock); - if (*offset > d_inode(dentry)->i_size) + if (*offset > d_inode(dentry)->i_size) { i_size_write(d_inode(dentry), *offset); + d_inode(dentry)->i_blocks = (512 - 1 + *offset) >> 9; + } spin_unlock(&d_inode(dentry)->i_lock); } mark_inode_dirty_sync(d_inode(dentry)); @@ -1947,7 +2020,8 @@ struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) continue; if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { - if (!open_file->invalidHandle) { + if ((!open_file->invalidHandle) && + (!open_file->oplock_break_received)) { /* found a good file */ /* lock it so it will not be closed on us */ cifsFileInfo_get(open_file); @@ -2476,6 +2550,8 @@ retry: if (cfile) cifsFileInfo_put(cfile); free_xid(xid); + /* Indication to update ctime and mtime as close is deferred */ + set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags); return rc; } @@ -2577,13 +2653,17 @@ static int cifs_write_end(struct file *file, struct address_space *mapping, if (rc > 0) { spin_lock(&inode->i_lock); - if (pos > inode->i_size) + if (pos > inode->i_size) { i_size_write(inode, pos); + inode->i_blocks = (512 - 1 + pos) >> 9; + } spin_unlock(&inode->i_lock); } unlock_page(page); put_page(page); + /* Indication to update ctime and mtime as close is deferred */ + set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags); return rc; } @@ -4744,6 +4824,8 @@ void cifs_oplock_break(struct work_struct *work) struct TCP_Server_Info *server = tcon->ses->server; int rc = 0; bool purge_cache = false; + bool is_deferred = false; + struct cifs_deferred_close *dclose; wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, TASK_UNINTERRUPTIBLE); @@ -4790,6 +4872,18 @@ oplock_break_ack: cinode); cifs_dbg(FYI, "Oplock release rc = %d\n", rc); } + /* + * When oplock break is received and there are no active + * file handles but cached, then set the flag oplock_break_received. + * So, new open will not use cached handle. + */ + spin_lock(&CIFS_I(inode)->deferred_lock); + is_deferred = cifs_is_deferred_close(cfile, &dclose); + if (is_deferred && cfile->deferred_scheduled) { + cfile->oplock_break_received = true; + mod_delayed_work(deferredclose_wq, &cfile->deferred, 0); + } + spin_unlock(&CIFS_I(inode)->deferred_lock); _cifsFileInfo_put(cfile, false /* do not wait for ourself */, false); cifs_done_oplock_break(cinode); } diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c index 3e0d016849e3..3bcf881c3ae9 100644 --- a/fs/cifs/fs_context.c +++ b/fs/cifs/fs_context.c @@ -476,6 +476,7 @@ smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx) /* move "pos" up to delimiter or NULL */ pos += len; + kfree(ctx->UNC); ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL); if (!ctx->UNC) return -ENOMEM; @@ -486,6 +487,9 @@ smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx) if (*pos == '/' || *pos == '\\') pos++; + kfree(ctx->prepath); + ctx->prepath = NULL; + /* If pos is NULL then no prepath */ if (!*pos) return 0; @@ -1642,6 +1646,7 @@ void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb) cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n"); } } + cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SHUTDOWN; return; } diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 002d864b8f7b..1dfa57982522 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -26,7 +26,6 @@ #include <linux/sched/signal.h> #include <linux/wait_bit.h> #include <linux/fiemap.h> - #include <asm/div64.h> #include "cifsfs.h" #include "cifspdu.h" @@ -38,7 +37,7 @@ #include "cifs_unicode.h" #include "fscache.h" #include "fs_context.h" - +#include "cifs_ioctl.h" static void cifs_set_ops(struct inode *inode) { @@ -1610,6 +1609,9 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry) cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry); + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); @@ -1632,6 +1634,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry) goto unlink_out; } + cifs_close_all_deferred_files(tcon); if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))) { rc = CIFSPOSIXDelFile(xid, tcon, full_path, @@ -1872,6 +1875,8 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode, mode, inode); cifs_sb = CIFS_SB(inode->i_sb); + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); @@ -1954,6 +1959,11 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry) } cifs_sb = CIFS_SB(inode->i_sb); + if (unlikely(cifs_forced_shutdown(cifs_sb))) { + rc = -EIO; + goto rmdir_exit; + } + tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) { rc = PTR_ERR(tlink); @@ -2088,6 +2098,9 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir, return -EINVAL; cifs_sb = CIFS_SB(source_dir->i_sb); + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); @@ -2109,6 +2122,7 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir, goto cifs_rename_exit; } + cifs_close_all_deferred_files(tcon); rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry, to_name); @@ -2404,6 +2418,9 @@ int cifs_getattr(struct user_namespace *mnt_userns, const struct path *path, struct inode *inode = d_inode(dentry); int rc; + if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) + return -EIO; + /* * We need to be sure that all dirty pages are written and the server * has actual ctime, mtime and file length. @@ -2476,6 +2493,9 @@ int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start, struct cifsFileInfo *cfile; int rc; + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + /* * We need to be sure that all dirty pages are written as they * might fill holes on the server. @@ -2962,6 +2982,9 @@ cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry, struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb); int rc, retries = 0; + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + do { if (pTcon->unix_ext) rc = cifs_setattr_unix(direntry, attrs); diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c index 08d99fec593e..28ec8d7c521a 100644 --- a/fs/cifs/ioctl.c +++ b/fs/cifs/ioctl.c @@ -164,6 +164,100 @@ static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon, return rc; } +static int cifs_shutdown(struct super_block *sb, unsigned long arg) +{ + struct cifs_sb_info *sbi = CIFS_SB(sb); + __u32 flags; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (get_user(flags, (__u32 __user *)arg)) + return -EFAULT; + + if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) + return -EINVAL; + + if (cifs_forced_shutdown(sbi)) + return 0; + + cifs_dbg(VFS, "shut down requested (%d)", flags); +/* trace_cifs_shutdown(sb, flags);*/ + + /* + * see: + * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html + * for more information and description of original intent of the flags + */ + switch (flags) { + /* + * We could add support later for default flag which requires: + * "Flush all dirty data and metadata to disk" + * would need to call syncfs or equivalent to flush page cache for + * the mount and then issue fsync to server (if nostrictsync not set) + */ + case CIFS_GOING_FLAGS_DEFAULT: + cifs_dbg(FYI, "shutdown with default flag not supported\n"); + return -EINVAL; + /* + * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not + * data) but metadata writes are not cached on the client, so can treat + * it similarly to NOLOGFLUSH + */ + case CIFS_GOING_FLAGS_LOGFLUSH: + case CIFS_GOING_FLAGS_NOLOGFLUSH: + sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; + return 0; + default: + return -EINVAL; + } + return 0; +} + +static int cifs_dump_full_key(struct cifs_tcon *tcon, unsigned long arg) +{ + struct smb3_full_key_debug_info pfull_key_inf; + __u64 suid; + struct list_head *tmp; + struct cifs_ses *ses; + bool found = false; + + if (!smb3_encryption_required(tcon)) + return -EOPNOTSUPP; + + ses = tcon->ses; /* default to user id for current user */ + if (get_user(suid, (__u64 __user *)arg)) + suid = 0; + if (suid) { + /* search to see if there is a session with a matching SMB UID */ + spin_lock(&cifs_tcp_ses_lock); + list_for_each(tmp, &tcon->ses->server->smb_ses_list) { + ses = list_entry(tmp, struct cifs_ses, smb_ses_list); + if (ses->Suid == suid) { + found = true; + break; + } + } + spin_unlock(&cifs_tcp_ses_lock); + if (found == false) + return -EINVAL; + } /* else uses default user's SMB UID (ie current user) */ + + pfull_key_inf.cipher_type = le16_to_cpu(ses->server->cipher_type); + pfull_key_inf.Suid = ses->Suid; + memcpy(pfull_key_inf.auth_key, ses->auth_key.response, + 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); + memcpy(pfull_key_inf.smb3decryptionkey, ses->smb3decryptionkey, + 32 /* SMB3_ENC_DEC_KEY_SIZE */); + memcpy(pfull_key_inf.smb3encryptionkey, + ses->smb3encryptionkey, 32 /* SMB3_ENC_DEC_KEY_SIZE */); + if (copy_to_user((void __user *)arg, &pfull_key_inf, + sizeof(struct smb3_full_key_debug_info))) + return -EFAULT; + + return 0; +} + long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) { struct inode *inode = file_inode(filep); @@ -304,6 +398,21 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) else rc = 0; break; + /* + * Dump full key (32 bytes instead of 16 bytes) is + * needed if GCM256 (stronger encryption) negotiated + */ + case CIFS_DUMP_FULL_KEY: + if (pSMBFile == NULL) + break; + if (!capable(CAP_SYS_ADMIN)) { + rc = -EACCES; + break; + } + tcon = tlink_tcon(pSMBFile->tlink); + rc = cifs_dump_full_key(tcon, arg); + + break; case CIFS_IOC_NOTIFY: if (!S_ISDIR(inode->i_mode)) { /* Notify can only be done on directories */ @@ -325,6 +434,9 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) rc = -EOPNOTSUPP; cifs_put_tlink(tlink); break; + case CIFS_IOC_SHUTDOWN: + rc = cifs_shutdown(inode->i_sb, arg); + break; default: cifs_dbg(FYI, "unsupported ioctl\n"); break; diff --git a/fs/cifs/link.c b/fs/cifs/link.c index 616e1bc0cc0a..970fcf2adb08 100644 --- a/fs/cifs/link.c +++ b/fs/cifs/link.c @@ -30,6 +30,7 @@ #include "cifs_fs_sb.h" #include "cifs_unicode.h" #include "smb2proto.h" +#include "cifs_ioctl.h" /* * M-F Symlink Functions - Begin @@ -518,6 +519,9 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode, struct TCP_Server_Info *server; struct cifsInodeInfo *cifsInode; + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); @@ -679,9 +683,16 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode, struct tcon_link *tlink; struct cifs_tcon *pTcon; const char *full_path; - void *page = alloc_dentry_path(); + void *page; struct inode *newinode = NULL; + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + + page = alloc_dentry_path(); + if (!page) + return -ENOMEM; + xid = get_xid(); tlink = cifs_sb_tlink(cifs_sb); diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index c15a90e422be..524dbdfb7184 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -672,6 +672,85 @@ cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); } +bool +cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose) +{ + struct cifs_deferred_close *dclose; + + list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) { + if ((dclose->netfid == cfile->fid.netfid) && + (dclose->persistent_fid == cfile->fid.persistent_fid) && + (dclose->volatile_fid == cfile->fid.volatile_fid)) { + *pdclose = dclose; + return true; + } + } + return false; +} + +void +cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose) +{ + bool is_deferred = false; + struct cifs_deferred_close *pdclose; + + is_deferred = cifs_is_deferred_close(cfile, &pdclose); + if (is_deferred) { + kfree(dclose); + return; + } + + dclose->tlink = cfile->tlink; + dclose->netfid = cfile->fid.netfid; + dclose->persistent_fid = cfile->fid.persistent_fid; + dclose->volatile_fid = cfile->fid.volatile_fid; + list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes); +} + +void +cifs_del_deferred_close(struct cifsFileInfo *cfile) +{ + bool is_deferred = false; + struct cifs_deferred_close *dclose; + + is_deferred = cifs_is_deferred_close(cfile, &dclose); + if (!is_deferred) + return; + list_del(&dclose->dlist); + kfree(dclose); +} + +void +cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode) +{ + struct cifsFileInfo *cfile = NULL; + struct cifs_deferred_close *dclose; + + list_for_each_entry(cfile, &cifs_inode->openFileList, flist) { + spin_lock(&cifs_inode->deferred_lock); + if (cifs_is_deferred_close(cfile, &dclose)) + mod_delayed_work(deferredclose_wq, &cfile->deferred, 0); + spin_unlock(&cifs_inode->deferred_lock); + } +} + +void +cifs_close_all_deferred_files(struct cifs_tcon *tcon) +{ + struct cifsFileInfo *cfile; + struct cifsInodeInfo *cinode; + struct list_head *tmp; + + spin_lock(&tcon->open_file_lock); + list_for_each(tmp, &tcon->openFileList) { + cfile = list_entry(tmp, struct cifsFileInfo, tlist); + cinode = CIFS_I(d_inode(cfile->dentry)); + if (delayed_work_pending(&cfile->deferred)) + mod_delayed_work(deferredclose_wq, &cfile->deferred, 0); + } + spin_unlock(&tcon->open_file_lock); +} + /* parses DFS refferal V3 structure * caller is responsible for freeing target_nodes * returns: diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c index e351b945135b..aa3e8ca0457c 100644 --- a/fs/cifs/xattr.c +++ b/fs/cifs/xattr.c @@ -30,6 +30,7 @@ #include "cifs_debug.h" #include "cifs_fs_sb.h" #include "cifs_unicode.h" +#include "cifs_ioctl.h" #define MAX_EA_VALUE_SIZE CIFSMaxBufSize #define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */ @@ -421,6 +422,9 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size) const char *full_path; void *page; + if (unlikely(cifs_forced_shutdown(cifs_sb))) + return -EIO; + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) return -EOPNOTSUPP; |