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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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-----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEq1nRK9aeMoq1VSgcnJ2qBz9kQNkFAl6LFJ0ACgkQnJ2qBz9k QNkSUQgAzwaescnHeVTF7/Zg9Uj2xrfrTJZ1E+Mn9qnd/0/z/asVV+RKfY7Gnu7h g19inDI4ZESFz2gWz4jwJD1c2/yMZb8vnae4ye3dtCv2yjG/0JxCeue6vjwsWqmO 4jbSgk8YNQqzwEFVMzNp43ZJr3CFooLCIsJcL8q4yYk8Kt4pDUPmQ1vBvAc6k9vK BKMBvp926tbomP27nq0n0CjvHy7ipDGMl4H6i4vBxHRfbDPih2x9VEklK3JatC1n 4AKS6IYJrkZVdOjli+DrResbcWxyT4db5tPio5MU0RDnVhNZT2cHyNVXf5EpRJqP 72pa7gfPu1Rx1+tU8bDR/daSveou2A== =fkCV -----END PGP SIGNATURE----- Merge tag 'fsnotify_for_v5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull fsnotify updates from Jan Kara: "This implements the fanotify FAN_DIR_MODIFY event. This event reports the name in a directory under which a change happened and together with the directory filehandle and fstatat() allows reliable and efficient implementation of directory synchronization" * tag 'fsnotify_for_v5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: fanotify: Fix the checks in fanotify_fsid_equal fanotify: report name info for FAN_DIR_MODIFY event fanotify: record name info for FAN_DIR_MODIFY event fanotify: Drop fanotify_event_has_fid() fanotify: prepare to report both parent and child fid's fanotify: send FAN_DIR_MODIFY event flavor with dir inode and name fanotify: divorce fanotify_path_event and fanotify_fid_event fanotify: Store fanotify handles differently fanotify: Simplify create_fd() fanotify: fix merging marks masks with FAN_ONDIR fanotify: merge duplicate events on parent and child fsnotify: replace inode pointer with an object id fsnotify: simplify arguments passing to fsnotify_parent() fsnotify: use helpers to access data by data_type fsnotify: funnel all dirent events through fsnotify_name() fsnotify: factor helpers fsnotify_dentry() and fsnotify_file() fsnotify: tidy up FS_ and FAN_ constants
This commit is contained in:
commit
b6ff10700d
12 changed files with 642 additions and 368 deletions
|
@ -17,6 +17,59 @@
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#include "fanotify.h"
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static bool fanotify_path_equal(struct path *p1, struct path *p2)
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{
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return p1->mnt == p2->mnt && p1->dentry == p2->dentry;
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}
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static inline bool fanotify_fsid_equal(__kernel_fsid_t *fsid1,
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__kernel_fsid_t *fsid2)
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{
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return fsid1->val[0] == fsid2->val[0] && fsid1->val[1] == fsid2->val[1];
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}
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static bool fanotify_fh_equal(struct fanotify_fh *fh1,
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struct fanotify_fh *fh2)
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{
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if (fh1->type != fh2->type || fh1->len != fh2->len)
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return false;
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/* Do not merge events if we failed to encode fh */
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if (fh1->type == FILEID_INVALID)
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return false;
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return !fh1->len ||
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!memcmp(fanotify_fh_buf(fh1), fanotify_fh_buf(fh2), fh1->len);
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}
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static bool fanotify_fid_event_equal(struct fanotify_fid_event *ffe1,
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struct fanotify_fid_event *ffe2)
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{
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/* Do not merge fid events without object fh */
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if (!ffe1->object_fh.len)
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return false;
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return fanotify_fsid_equal(&ffe1->fsid, &ffe2->fsid) &&
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fanotify_fh_equal(&ffe1->object_fh, &ffe2->object_fh);
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}
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static bool fanotify_name_event_equal(struct fanotify_name_event *fne1,
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struct fanotify_name_event *fne2)
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{
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/*
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* Do not merge name events without dir fh.
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* FAN_DIR_MODIFY does not encode object fh, so it may be empty.
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*/
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if (!fne1->dir_fh.len)
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return false;
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if (fne1->name_len != fne2->name_len ||
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!fanotify_fh_equal(&fne1->dir_fh, &fne2->dir_fh))
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return false;
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return !memcmp(fne1->name, fne2->name, fne1->name_len);
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}
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static bool should_merge(struct fsnotify_event *old_fsn,
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struct fsnotify_event *new_fsn)
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{
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@ -26,14 +79,15 @@ static bool should_merge(struct fsnotify_event *old_fsn,
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old = FANOTIFY_E(old_fsn);
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new = FANOTIFY_E(new_fsn);
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if (old_fsn->inode != new_fsn->inode || old->pid != new->pid ||
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old->fh_type != new->fh_type || old->fh_len != new->fh_len)
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if (old_fsn->objectid != new_fsn->objectid ||
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old->type != new->type || old->pid != new->pid)
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return false;
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if (fanotify_event_has_path(old)) {
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return old->path.mnt == new->path.mnt &&
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old->path.dentry == new->path.dentry;
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} else if (fanotify_event_has_fid(old)) {
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switch (old->type) {
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case FANOTIFY_EVENT_TYPE_PATH:
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return fanotify_path_equal(fanotify_event_path(old),
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fanotify_event_path(new));
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case FANOTIFY_EVENT_TYPE_FID:
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/*
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* We want to merge many dirent events in the same dir (i.e.
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* creates/unlinks/renames), but we do not want to merge dirent
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@ -42,11 +96,18 @@ static bool should_merge(struct fsnotify_event *old_fsn,
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* mask FAN_CREATE|FAN_DELETE|FAN_ONDIR if it describes mkdir+
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* unlink pair or rmdir+create pair of events.
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*/
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return (old->mask & FS_ISDIR) == (new->mask & FS_ISDIR) &&
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fanotify_fid_equal(&old->fid, &new->fid, old->fh_len);
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if ((old->mask & FS_ISDIR) != (new->mask & FS_ISDIR))
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return false;
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return fanotify_fid_event_equal(FANOTIFY_FE(old),
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FANOTIFY_FE(new));
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case FANOTIFY_EVENT_TYPE_FID_NAME:
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return fanotify_name_event_equal(FANOTIFY_NE(old),
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FANOTIFY_NE(new));
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default:
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WARN_ON_ONCE(1);
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}
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/* Do not merge events if we failed to encode fid */
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return false;
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}
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@ -151,7 +212,7 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
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{
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__u32 marks_mask = 0, marks_ignored_mask = 0;
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__u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS;
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const struct path *path = data;
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const struct path *path = fsnotify_data_path(data, data_type);
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struct fsnotify_mark *mark;
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int type;
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@ -160,7 +221,7 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
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if (!FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
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/* Do we have path to open a file descriptor? */
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if (data_type != FSNOTIFY_EVENT_PATH)
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if (!path)
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return 0;
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/* Path type events are only relevant for files and dirs */
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if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry))
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@ -171,6 +232,13 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
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if (!fsnotify_iter_should_report_type(iter_info, type))
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continue;
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mark = iter_info->marks[type];
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/*
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* If the event is on dir and this mark doesn't care about
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* events on dir, don't send it!
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*/
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if (event_mask & FS_ISDIR && !(mark->mask & FS_ISDIR))
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continue;
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/*
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* If the event is for a child and this mark doesn't care about
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* events on a child, don't send it!
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@ -187,9 +255,9 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
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test_mask = event_mask & marks_mask & ~marks_ignored_mask;
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/*
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* dirent modification events (create/delete/move) do not carry the
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* child entry name/inode information. Instead, we report FAN_ONDIR
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* for mkdir/rmdir so user can differentiate them from creat/unlink.
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* For dirent modification events (create/delete/move) that do not carry
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* the child entry name information, we report FAN_ONDIR for mkdir/rmdir
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* so user can differentiate them from creat/unlink.
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*
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* For backward compatibility and consistency, do not report FAN_ONDIR
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* to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR
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@ -203,22 +271,20 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
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user_mask &= ~FAN_ONDIR;
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}
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if (event_mask & FS_ISDIR &&
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!(marks_mask & FS_ISDIR & ~marks_ignored_mask))
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return 0;
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return test_mask & user_mask;
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}
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static int fanotify_encode_fid(struct fanotify_event *event,
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struct inode *inode, gfp_t gfp,
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__kernel_fsid_t *fsid)
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static void fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode,
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gfp_t gfp)
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{
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struct fanotify_fid *fid = &event->fid;
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int dwords, bytes = 0;
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int err, type;
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int dwords, type, bytes = 0;
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char *ext_buf = NULL;
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void *buf = fh->buf;
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int err;
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if (!inode)
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goto out;
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fid->ext_fh = NULL;
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dwords = 0;
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err = -ENOENT;
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type = exportfs_encode_inode_fh(inode, NULL, &dwords, NULL);
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@ -229,31 +295,33 @@ static int fanotify_encode_fid(struct fanotify_event *event,
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if (bytes > FANOTIFY_INLINE_FH_LEN) {
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/* Treat failure to allocate fh as failure to allocate event */
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err = -ENOMEM;
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fid->ext_fh = kmalloc(bytes, gfp);
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if (!fid->ext_fh)
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ext_buf = kmalloc(bytes, gfp);
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if (!ext_buf)
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goto out_err;
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*fanotify_fh_ext_buf_ptr(fh) = ext_buf;
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buf = ext_buf;
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}
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type = exportfs_encode_inode_fh(inode, fanotify_fid_fh(fid, bytes),
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&dwords, NULL);
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type = exportfs_encode_inode_fh(inode, buf, &dwords, NULL);
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err = -EINVAL;
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if (!type || type == FILEID_INVALID || bytes != dwords << 2)
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goto out_err;
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fid->fsid = *fsid;
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event->fh_len = bytes;
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fh->type = type;
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fh->len = bytes;
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return type;
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return;
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out_err:
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pr_warn_ratelimited("fanotify: failed to encode fid (fsid=%x.%x, "
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"type=%d, bytes=%d, err=%i)\n",
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fsid->val[0], fsid->val[1], type, bytes, err);
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kfree(fid->ext_fh);
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fid->ext_fh = NULL;
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event->fh_len = 0;
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return FILEID_INVALID;
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pr_warn_ratelimited("fanotify: failed to encode fid (type=%d, len=%d, err=%i)\n",
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type, bytes, err);
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kfree(ext_buf);
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*fanotify_fh_ext_buf_ptr(fh) = NULL;
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out:
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/* Report the event without a file identifier on encode error */
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fh->type = FILEID_INVALID;
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fh->len = 0;
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}
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/*
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@ -269,21 +337,22 @@ static struct inode *fanotify_fid_inode(struct inode *to_tell, u32 event_mask,
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{
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if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
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return to_tell;
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else if (data_type == FSNOTIFY_EVENT_INODE)
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return (struct inode *)data;
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else if (data_type == FSNOTIFY_EVENT_PATH)
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return d_inode(((struct path *)data)->dentry);
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return NULL;
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return (struct inode *)fsnotify_data_inode(data, data_type);
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}
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struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
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struct inode *inode, u32 mask,
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const void *data, int data_type,
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const struct qstr *file_name,
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__kernel_fsid_t *fsid)
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{
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struct fanotify_event *event = NULL;
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struct fanotify_fid_event *ffe = NULL;
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struct fanotify_name_event *fne = NULL;
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gfp_t gfp = GFP_KERNEL_ACCOUNT;
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struct inode *id = fanotify_fid_inode(inode, mask, data, data_type);
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const struct path *path = fsnotify_data_path(data, data_type);
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/*
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* For queues with unlimited length lost events are not expected and
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@ -305,33 +374,81 @@ struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
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pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
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if (!pevent)
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goto out;
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event = &pevent->fae;
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event->type = FANOTIFY_EVENT_TYPE_PATH_PERM;
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pevent->response = 0;
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pevent->state = FAN_EVENT_INIT;
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goto init;
|
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}
|
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event = kmem_cache_alloc(fanotify_event_cachep, gfp);
|
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if (!event)
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goto out;
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init: __maybe_unused
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fsnotify_init_event(&event->fse, inode);
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/*
|
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* For FAN_DIR_MODIFY event, we report the fid of the directory and
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* the name of the modified entry.
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* Allocate an fanotify_name_event struct and copy the name.
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*/
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if (mask & FAN_DIR_MODIFY && !(WARN_ON_ONCE(!file_name))) {
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fne = kmalloc(sizeof(*fne) + file_name->len + 1, gfp);
|
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if (!fne)
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goto out;
|
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|
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event = &fne->fae;
|
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event->type = FANOTIFY_EVENT_TYPE_FID_NAME;
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fne->name_len = file_name->len;
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strcpy(fne->name, file_name->name);
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goto init;
|
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}
|
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|
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if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
|
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ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp);
|
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if (!ffe)
|
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goto out;
|
||||
|
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event = &ffe->fae;
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event->type = FANOTIFY_EVENT_TYPE_FID;
|
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} else {
|
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struct fanotify_path_event *pevent;
|
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|
||||
pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp);
|
||||
if (!pevent)
|
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goto out;
|
||||
|
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event = &pevent->fae;
|
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event->type = FANOTIFY_EVENT_TYPE_PATH;
|
||||
}
|
||||
|
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init:
|
||||
/*
|
||||
* Use the victim inode instead of the watching inode as the id for
|
||||
* event queue, so event reported on parent is merged with event
|
||||
* reported on child when both directory and child watches exist.
|
||||
*/
|
||||
fsnotify_init_event(&event->fse, (unsigned long)id);
|
||||
event->mask = mask;
|
||||
if (FAN_GROUP_FLAG(group, FAN_REPORT_TID))
|
||||
event->pid = get_pid(task_pid(current));
|
||||
else
|
||||
event->pid = get_pid(task_tgid(current));
|
||||
event->fh_len = 0;
|
||||
if (id && FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
|
||||
/* Report the event without a file identifier on encode error */
|
||||
event->fh_type = fanotify_encode_fid(event, id, gfp, fsid);
|
||||
} else if (data_type == FSNOTIFY_EVENT_PATH) {
|
||||
event->fh_type = FILEID_ROOT;
|
||||
event->path = *((struct path *)data);
|
||||
path_get(&event->path);
|
||||
} else {
|
||||
event->fh_type = FILEID_INVALID;
|
||||
event->path.mnt = NULL;
|
||||
event->path.dentry = NULL;
|
||||
|
||||
if (fsid && fanotify_event_fsid(event))
|
||||
*fanotify_event_fsid(event) = *fsid;
|
||||
|
||||
if (fanotify_event_object_fh(event))
|
||||
fanotify_encode_fh(fanotify_event_object_fh(event), id, gfp);
|
||||
|
||||
if (fanotify_event_dir_fh(event))
|
||||
fanotify_encode_fh(fanotify_event_dir_fh(event), id, gfp);
|
||||
|
||||
if (fanotify_event_has_path(event)) {
|
||||
struct path *p = fanotify_event_path(event);
|
||||
|
||||
if (path) {
|
||||
*p = *path;
|
||||
path_get(path);
|
||||
} else {
|
||||
p->mnt = NULL;
|
||||
p->dentry = NULL;
|
||||
}
|
||||
}
|
||||
out:
|
||||
memalloc_unuse_memcg();
|
||||
|
@ -392,6 +509,7 @@ static int fanotify_handle_event(struct fsnotify_group *group,
|
|||
BUILD_BUG_ON(FAN_MOVED_FROM != FS_MOVED_FROM);
|
||||
BUILD_BUG_ON(FAN_CREATE != FS_CREATE);
|
||||
BUILD_BUG_ON(FAN_DELETE != FS_DELETE);
|
||||
BUILD_BUG_ON(FAN_DIR_MODIFY != FS_DIR_MODIFY);
|
||||
BUILD_BUG_ON(FAN_DELETE_SELF != FS_DELETE_SELF);
|
||||
BUILD_BUG_ON(FAN_MOVE_SELF != FS_MOVE_SELF);
|
||||
BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
|
||||
|
@ -402,7 +520,7 @@ static int fanotify_handle_event(struct fsnotify_group *group,
|
|||
BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
|
||||
BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
|
||||
|
||||
BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
|
||||
BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 20);
|
||||
|
||||
mask = fanotify_group_event_mask(group, iter_info, mask, data,
|
||||
data_type);
|
||||
|
@ -429,7 +547,7 @@ static int fanotify_handle_event(struct fsnotify_group *group,
|
|||
}
|
||||
|
||||
event = fanotify_alloc_event(group, inode, mask, data, data_type,
|
||||
&fsid);
|
||||
file_name, &fsid);
|
||||
ret = -ENOMEM;
|
||||
if (unlikely(!event)) {
|
||||
/*
|
||||
|
@ -451,7 +569,7 @@ static int fanotify_handle_event(struct fsnotify_group *group,
|
|||
|
||||
ret = 0;
|
||||
} else if (fanotify_is_perm_event(mask)) {
|
||||
ret = fanotify_get_response(group, FANOTIFY_PE(fsn_event),
|
||||
ret = fanotify_get_response(group, FANOTIFY_PERM(event),
|
||||
iter_info);
|
||||
}
|
||||
finish:
|
||||
|
@ -470,22 +588,58 @@ static void fanotify_free_group_priv(struct fsnotify_group *group)
|
|||
free_uid(user);
|
||||
}
|
||||
|
||||
static void fanotify_free_path_event(struct fanotify_event *event)
|
||||
{
|
||||
path_put(fanotify_event_path(event));
|
||||
kmem_cache_free(fanotify_path_event_cachep, FANOTIFY_PE(event));
|
||||
}
|
||||
|
||||
static void fanotify_free_perm_event(struct fanotify_event *event)
|
||||
{
|
||||
path_put(fanotify_event_path(event));
|
||||
kmem_cache_free(fanotify_perm_event_cachep, FANOTIFY_PERM(event));
|
||||
}
|
||||
|
||||
static void fanotify_free_fid_event(struct fanotify_event *event)
|
||||
{
|
||||
struct fanotify_fid_event *ffe = FANOTIFY_FE(event);
|
||||
|
||||
if (fanotify_fh_has_ext_buf(&ffe->object_fh))
|
||||
kfree(fanotify_fh_ext_buf(&ffe->object_fh));
|
||||
kmem_cache_free(fanotify_fid_event_cachep, ffe);
|
||||
}
|
||||
|
||||
static void fanotify_free_name_event(struct fanotify_event *event)
|
||||
{
|
||||
struct fanotify_name_event *fne = FANOTIFY_NE(event);
|
||||
|
||||
if (fanotify_fh_has_ext_buf(&fne->dir_fh))
|
||||
kfree(fanotify_fh_ext_buf(&fne->dir_fh));
|
||||
kfree(fne);
|
||||
}
|
||||
|
||||
static void fanotify_free_event(struct fsnotify_event *fsn_event)
|
||||
{
|
||||
struct fanotify_event *event;
|
||||
|
||||
event = FANOTIFY_E(fsn_event);
|
||||
if (fanotify_event_has_path(event))
|
||||
path_put(&event->path);
|
||||
else if (fanotify_event_has_ext_fh(event))
|
||||
kfree(event->fid.ext_fh);
|
||||
put_pid(event->pid);
|
||||
if (fanotify_is_perm_event(event->mask)) {
|
||||
kmem_cache_free(fanotify_perm_event_cachep,
|
||||
FANOTIFY_PE(fsn_event));
|
||||
return;
|
||||
switch (event->type) {
|
||||
case FANOTIFY_EVENT_TYPE_PATH:
|
||||
fanotify_free_path_event(event);
|
||||
break;
|
||||
case FANOTIFY_EVENT_TYPE_PATH_PERM:
|
||||
fanotify_free_perm_event(event);
|
||||
break;
|
||||
case FANOTIFY_EVENT_TYPE_FID:
|
||||
fanotify_free_fid_event(event);
|
||||
break;
|
||||
case FANOTIFY_EVENT_TYPE_FID_NAME:
|
||||
fanotify_free_name_event(event);
|
||||
break;
|
||||
default:
|
||||
WARN_ON_ONCE(1);
|
||||
}
|
||||
kmem_cache_free(fanotify_event_cachep, event);
|
||||
}
|
||||
|
||||
static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
|
||||
|
|
|
@ -5,7 +5,8 @@
|
|||
#include <linux/exportfs.h>
|
||||
|
||||
extern struct kmem_cache *fanotify_mark_cache;
|
||||
extern struct kmem_cache *fanotify_event_cachep;
|
||||
extern struct kmem_cache *fanotify_fid_event_cachep;
|
||||
extern struct kmem_cache *fanotify_path_event_cachep;
|
||||
extern struct kmem_cache *fanotify_perm_event_cachep;
|
||||
|
||||
/* Possible states of the permission event */
|
||||
|
@ -18,94 +19,140 @@ enum {
|
|||
|
||||
/*
|
||||
* 3 dwords are sufficient for most local fs (64bit ino, 32bit generation).
|
||||
* For 32bit arch, fid increases the size of fanotify_event by 12 bytes and
|
||||
* fh_* fields increase the size of fanotify_event by another 4 bytes.
|
||||
* For 64bit arch, fid increases the size of fanotify_fid by 8 bytes and
|
||||
* fh_* fields are packed in a hole after mask.
|
||||
* fh buf should be dword aligned. On 64bit arch, the ext_buf pointer is
|
||||
* stored in either the first or last 2 dwords.
|
||||
*/
|
||||
#if BITS_PER_LONG == 32
|
||||
#define FANOTIFY_INLINE_FH_LEN (3 << 2)
|
||||
#else
|
||||
#define FANOTIFY_INLINE_FH_LEN (4 << 2)
|
||||
#endif
|
||||
|
||||
struct fanotify_fid {
|
||||
__kernel_fsid_t fsid;
|
||||
union {
|
||||
unsigned char fh[FANOTIFY_INLINE_FH_LEN];
|
||||
unsigned char *ext_fh;
|
||||
};
|
||||
};
|
||||
struct fanotify_fh {
|
||||
unsigned char buf[FANOTIFY_INLINE_FH_LEN];
|
||||
u8 type;
|
||||
u8 len;
|
||||
} __aligned(4);
|
||||
|
||||
static inline void *fanotify_fid_fh(struct fanotify_fid *fid,
|
||||
unsigned int fh_len)
|
||||
static inline bool fanotify_fh_has_ext_buf(struct fanotify_fh *fh)
|
||||
{
|
||||
return fh_len <= FANOTIFY_INLINE_FH_LEN ? fid->fh : fid->ext_fh;
|
||||
return fh->len > FANOTIFY_INLINE_FH_LEN;
|
||||
}
|
||||
|
||||
static inline bool fanotify_fid_equal(struct fanotify_fid *fid1,
|
||||
struct fanotify_fid *fid2,
|
||||
unsigned int fh_len)
|
||||
static inline char **fanotify_fh_ext_buf_ptr(struct fanotify_fh *fh)
|
||||
{
|
||||
return fid1->fsid.val[0] == fid2->fsid.val[0] &&
|
||||
fid1->fsid.val[1] == fid2->fsid.val[1] &&
|
||||
!memcmp(fanotify_fid_fh(fid1, fh_len),
|
||||
fanotify_fid_fh(fid2, fh_len), fh_len);
|
||||
BUILD_BUG_ON(__alignof__(char *) - 4 + sizeof(char *) >
|
||||
FANOTIFY_INLINE_FH_LEN);
|
||||
return (char **)ALIGN((unsigned long)(fh->buf), __alignof__(char *));
|
||||
}
|
||||
|
||||
static inline void *fanotify_fh_ext_buf(struct fanotify_fh *fh)
|
||||
{
|
||||
return *fanotify_fh_ext_buf_ptr(fh);
|
||||
}
|
||||
|
||||
static inline void *fanotify_fh_buf(struct fanotify_fh *fh)
|
||||
{
|
||||
return fanotify_fh_has_ext_buf(fh) ? fanotify_fh_ext_buf(fh) : fh->buf;
|
||||
}
|
||||
|
||||
/*
|
||||
* Structure for normal fanotify events. It gets allocated in
|
||||
* Common structure for fanotify events. Concrete structs are allocated in
|
||||
* fanotify_handle_event() and freed when the information is retrieved by
|
||||
* userspace
|
||||
* userspace. The type of event determines how it was allocated, how it will
|
||||
* be freed and which concrete struct it may be cast to.
|
||||
*/
|
||||
enum fanotify_event_type {
|
||||
FANOTIFY_EVENT_TYPE_FID, /* fixed length */
|
||||
FANOTIFY_EVENT_TYPE_FID_NAME, /* variable length */
|
||||
FANOTIFY_EVENT_TYPE_PATH,
|
||||
FANOTIFY_EVENT_TYPE_PATH_PERM,
|
||||
};
|
||||
|
||||
struct fanotify_event {
|
||||
struct fsnotify_event fse;
|
||||
u32 mask;
|
||||
/*
|
||||
* Those fields are outside fanotify_fid to pack fanotify_event nicely
|
||||
* on 64bit arch and to use fh_type as an indication of whether path
|
||||
* or fid are used in the union:
|
||||
* FILEID_ROOT (0) for path, > 0 for fid, FILEID_INVALID for neither.
|
||||
*/
|
||||
u8 fh_type;
|
||||
u8 fh_len;
|
||||
u16 pad;
|
||||
union {
|
||||
/*
|
||||
* We hold ref to this path so it may be dereferenced at any
|
||||
* point during this object's lifetime
|
||||
*/
|
||||
struct path path;
|
||||
/*
|
||||
* With FAN_REPORT_FID, we do not hold any reference on the
|
||||
* victim object. Instead we store its NFS file handle and its
|
||||
* filesystem's fsid as a unique identifier.
|
||||
*/
|
||||
struct fanotify_fid fid;
|
||||
};
|
||||
enum fanotify_event_type type;
|
||||
struct pid *pid;
|
||||
};
|
||||
|
||||
static inline bool fanotify_event_has_path(struct fanotify_event *event)
|
||||
struct fanotify_fid_event {
|
||||
struct fanotify_event fae;
|
||||
__kernel_fsid_t fsid;
|
||||
struct fanotify_fh object_fh;
|
||||
};
|
||||
|
||||
static inline struct fanotify_fid_event *
|
||||
FANOTIFY_FE(struct fanotify_event *event)
|
||||
{
|
||||
return event->fh_type == FILEID_ROOT;
|
||||
return container_of(event, struct fanotify_fid_event, fae);
|
||||
}
|
||||
|
||||
static inline bool fanotify_event_has_fid(struct fanotify_event *event)
|
||||
struct fanotify_name_event {
|
||||
struct fanotify_event fae;
|
||||
__kernel_fsid_t fsid;
|
||||
struct fanotify_fh dir_fh;
|
||||
u8 name_len;
|
||||
char name[0];
|
||||
};
|
||||
|
||||
static inline struct fanotify_name_event *
|
||||
FANOTIFY_NE(struct fanotify_event *event)
|
||||
{
|
||||
return event->fh_type != FILEID_ROOT &&
|
||||
event->fh_type != FILEID_INVALID;
|
||||
return container_of(event, struct fanotify_name_event, fae);
|
||||
}
|
||||
|
||||
static inline bool fanotify_event_has_ext_fh(struct fanotify_event *event)
|
||||
static inline __kernel_fsid_t *fanotify_event_fsid(struct fanotify_event *event)
|
||||
{
|
||||
return fanotify_event_has_fid(event) &&
|
||||
event->fh_len > FANOTIFY_INLINE_FH_LEN;
|
||||
if (event->type == FANOTIFY_EVENT_TYPE_FID)
|
||||
return &FANOTIFY_FE(event)->fsid;
|
||||
else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
|
||||
return &FANOTIFY_NE(event)->fsid;
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline void *fanotify_event_fh(struct fanotify_event *event)
|
||||
static inline struct fanotify_fh *fanotify_event_object_fh(
|
||||
struct fanotify_event *event)
|
||||
{
|
||||
return fanotify_fid_fh(&event->fid, event->fh_len);
|
||||
if (event->type == FANOTIFY_EVENT_TYPE_FID)
|
||||
return &FANOTIFY_FE(event)->object_fh;
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline struct fanotify_fh *fanotify_event_dir_fh(
|
||||
struct fanotify_event *event)
|
||||
{
|
||||
if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
|
||||
return &FANOTIFY_NE(event)->dir_fh;
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline int fanotify_event_object_fh_len(struct fanotify_event *event)
|
||||
{
|
||||
struct fanotify_fh *fh = fanotify_event_object_fh(event);
|
||||
|
||||
return fh ? fh->len : 0;
|
||||
}
|
||||
|
||||
static inline bool fanotify_event_has_name(struct fanotify_event *event)
|
||||
{
|
||||
return event->type == FANOTIFY_EVENT_TYPE_FID_NAME;
|
||||
}
|
||||
|
||||
static inline int fanotify_event_name_len(struct fanotify_event *event)
|
||||
{
|
||||
return fanotify_event_has_name(event) ?
|
||||
FANOTIFY_NE(event)->name_len : 0;
|
||||
}
|
||||
|
||||
struct fanotify_path_event {
|
||||
struct fanotify_event fae;
|
||||
struct path path;
|
||||
};
|
||||
|
||||
static inline struct fanotify_path_event *
|
||||
FANOTIFY_PE(struct fanotify_event *event)
|
||||
{
|
||||
return container_of(event, struct fanotify_path_event, fae);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -117,15 +164,16 @@ static inline void *fanotify_event_fh(struct fanotify_event *event)
|
|||
*/
|
||||
struct fanotify_perm_event {
|
||||
struct fanotify_event fae;
|
||||
struct path path;
|
||||
unsigned short response; /* userspace answer to the event */
|
||||
unsigned short state; /* state of the event */
|
||||
int fd; /* fd we passed to userspace for this event */
|
||||
};
|
||||
|
||||
static inline struct fanotify_perm_event *
|
||||
FANOTIFY_PE(struct fsnotify_event *fse)
|
||||
FANOTIFY_PERM(struct fanotify_event *event)
|
||||
{
|
||||
return container_of(fse, struct fanotify_perm_event, fae.fse);
|
||||
return container_of(event, struct fanotify_perm_event, fae);
|
||||
}
|
||||
|
||||
static inline bool fanotify_is_perm_event(u32 mask)
|
||||
|
@ -139,7 +187,24 @@ static inline struct fanotify_event *FANOTIFY_E(struct fsnotify_event *fse)
|
|||
return container_of(fse, struct fanotify_event, fse);
|
||||
}
|
||||
|
||||
static inline bool fanotify_event_has_path(struct fanotify_event *event)
|
||||
{
|
||||
return event->type == FANOTIFY_EVENT_TYPE_PATH ||
|
||||
event->type == FANOTIFY_EVENT_TYPE_PATH_PERM;
|
||||
}
|
||||
|
||||
static inline struct path *fanotify_event_path(struct fanotify_event *event)
|
||||
{
|
||||
if (event->type == FANOTIFY_EVENT_TYPE_PATH)
|
||||
return &FANOTIFY_PE(event)->path;
|
||||
else if (event->type == FANOTIFY_EVENT_TYPE_PATH_PERM)
|
||||
return &FANOTIFY_PERM(event)->path;
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
|
||||
struct inode *inode, u32 mask,
|
||||
const void *data, int data_type,
|
||||
const struct qstr *file_name,
|
||||
__kernel_fsid_t *fsid);
|
||||
|
|
|
@ -46,32 +46,53 @@
|
|||
extern const struct fsnotify_ops fanotify_fsnotify_ops;
|
||||
|
||||
struct kmem_cache *fanotify_mark_cache __read_mostly;
|
||||
struct kmem_cache *fanotify_event_cachep __read_mostly;
|
||||
struct kmem_cache *fanotify_fid_event_cachep __read_mostly;
|
||||
struct kmem_cache *fanotify_path_event_cachep __read_mostly;
|
||||
struct kmem_cache *fanotify_perm_event_cachep __read_mostly;
|
||||
|
||||
#define FANOTIFY_EVENT_ALIGN 4
|
||||
#define FANOTIFY_INFO_HDR_LEN \
|
||||
(sizeof(struct fanotify_event_info_fid) + sizeof(struct file_handle))
|
||||
|
||||
static int fanotify_fid_info_len(int fh_len, int name_len)
|
||||
{
|
||||
int info_len = fh_len;
|
||||
|
||||
if (name_len)
|
||||
info_len += name_len + 1;
|
||||
|
||||
return roundup(FANOTIFY_INFO_HDR_LEN + info_len, FANOTIFY_EVENT_ALIGN);
|
||||
}
|
||||
|
||||
static int fanotify_event_info_len(struct fanotify_event *event)
|
||||
{
|
||||
if (!fanotify_event_has_fid(event))
|
||||
return 0;
|
||||
int info_len = 0;
|
||||
int fh_len = fanotify_event_object_fh_len(event);
|
||||
|
||||
return roundup(sizeof(struct fanotify_event_info_fid) +
|
||||
sizeof(struct file_handle) + event->fh_len,
|
||||
FANOTIFY_EVENT_ALIGN);
|
||||
if (fh_len)
|
||||
info_len += fanotify_fid_info_len(fh_len, 0);
|
||||
|
||||
if (fanotify_event_name_len(event)) {
|
||||
struct fanotify_name_event *fne = FANOTIFY_NE(event);
|
||||
|
||||
info_len += fanotify_fid_info_len(fne->dir_fh.len,
|
||||
fne->name_len);
|
||||
}
|
||||
|
||||
return info_len;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get an fsnotify notification event if one exists and is small
|
||||
* Get an fanotify notification event if one exists and is small
|
||||
* enough to fit in "count". Return an error pointer if the count
|
||||
* is not large enough. When permission event is dequeued, its state is
|
||||
* updated accordingly.
|
||||
*/
|
||||
static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
|
||||
static struct fanotify_event *get_one_event(struct fsnotify_group *group,
|
||||
size_t count)
|
||||
{
|
||||
size_t event_size = FAN_EVENT_METADATA_LEN;
|
||||
struct fsnotify_event *fsn_event = NULL;
|
||||
struct fanotify_event *event = NULL;
|
||||
|
||||
pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
|
||||
|
||||
|
@ -85,26 +106,23 @@ static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
|
|||
}
|
||||
|
||||
if (event_size > count) {
|
||||
fsn_event = ERR_PTR(-EINVAL);
|
||||
event = ERR_PTR(-EINVAL);
|
||||
goto out;
|
||||
}
|
||||
fsn_event = fsnotify_remove_first_event(group);
|
||||
if (fanotify_is_perm_event(FANOTIFY_E(fsn_event)->mask))
|
||||
FANOTIFY_PE(fsn_event)->state = FAN_EVENT_REPORTED;
|
||||
event = FANOTIFY_E(fsnotify_remove_first_event(group));
|
||||
if (fanotify_is_perm_event(event->mask))
|
||||
FANOTIFY_PERM(event)->state = FAN_EVENT_REPORTED;
|
||||
out:
|
||||
spin_unlock(&group->notification_lock);
|
||||
return fsn_event;
|
||||
return event;
|
||||
}
|
||||
|
||||
static int create_fd(struct fsnotify_group *group,
|
||||
struct fanotify_event *event,
|
||||
static int create_fd(struct fsnotify_group *group, struct path *path,
|
||||
struct file **file)
|
||||
{
|
||||
int client_fd;
|
||||
struct file *new_file;
|
||||
|
||||
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
|
||||
|
||||
client_fd = get_unused_fd_flags(group->fanotify_data.f_flags);
|
||||
if (client_fd < 0)
|
||||
return client_fd;
|
||||
|
@ -113,14 +131,9 @@ static int create_fd(struct fsnotify_group *group,
|
|||
* we need a new file handle for the userspace program so it can read even if it was
|
||||
* originally opened O_WRONLY.
|
||||
*/
|
||||
/* it's possible this event was an overflow event. in that case dentry and mnt
|
||||
* are NULL; That's fine, just don't call dentry open */
|
||||
if (event->path.dentry && event->path.mnt)
|
||||
new_file = dentry_open(&event->path,
|
||||
group->fanotify_data.f_flags | FMODE_NONOTIFY,
|
||||
current_cred());
|
||||
else
|
||||
new_file = ERR_PTR(-EOVERFLOW);
|
||||
new_file = dentry_open(path,
|
||||
group->fanotify_data.f_flags | FMODE_NONOTIFY,
|
||||
current_cred());
|
||||
if (IS_ERR(new_file)) {
|
||||
/*
|
||||
* we still send an event even if we can't open the file. this
|
||||
|
@ -204,83 +217,111 @@ static int process_access_response(struct fsnotify_group *group,
|
|||
return -ENOENT;
|
||||
}
|
||||
|
||||
static int copy_fid_to_user(struct fanotify_event *event, char __user *buf)
|
||||
static int copy_info_to_user(__kernel_fsid_t *fsid, struct fanotify_fh *fh,
|
||||
const char *name, size_t name_len,
|
||||
char __user *buf, size_t count)
|
||||
{
|
||||
struct fanotify_event_info_fid info = { };
|
||||
struct file_handle handle = { };
|
||||
unsigned char bounce[FANOTIFY_INLINE_FH_LEN], *fh;
|
||||
size_t fh_len = event->fh_len;
|
||||
size_t len = fanotify_event_info_len(event);
|
||||
unsigned char bounce[FANOTIFY_INLINE_FH_LEN], *fh_buf;
|
||||
size_t fh_len = fh ? fh->len : 0;
|
||||
size_t info_len = fanotify_fid_info_len(fh_len, name_len);
|
||||
size_t len = info_len;
|
||||
|
||||
if (!len)
|
||||
pr_debug("%s: fh_len=%zu name_len=%zu, info_len=%zu, count=%zu\n",
|
||||
__func__, fh_len, name_len, info_len, count);
|
||||
|
||||
if (!fh_len || (name && !name_len))
|
||||
return 0;
|
||||
|
||||
if (WARN_ON_ONCE(len < sizeof(info) + sizeof(handle) + fh_len))
|
||||
if (WARN_ON_ONCE(len < sizeof(info) || len > count))
|
||||
return -EFAULT;
|
||||
|
||||
/* Copy event info fid header followed by vaiable sized file handle */
|
||||
info.hdr.info_type = FAN_EVENT_INFO_TYPE_FID;
|
||||
/*
|
||||
* Copy event info fid header followed by variable sized file handle
|
||||
* and optionally followed by variable sized filename.
|
||||
*/
|
||||
info.hdr.info_type = name_len ? FAN_EVENT_INFO_TYPE_DFID_NAME :
|
||||
FAN_EVENT_INFO_TYPE_FID;
|
||||
info.hdr.len = len;
|
||||
info.fsid = event->fid.fsid;
|
||||
info.fsid = *fsid;
|
||||
if (copy_to_user(buf, &info, sizeof(info)))
|
||||
return -EFAULT;
|
||||
|
||||
buf += sizeof(info);
|
||||
len -= sizeof(info);
|
||||
handle.handle_type = event->fh_type;
|
||||
if (WARN_ON_ONCE(len < sizeof(handle)))
|
||||
return -EFAULT;
|
||||
|
||||
handle.handle_type = fh->type;
|
||||
handle.handle_bytes = fh_len;
|
||||
if (copy_to_user(buf, &handle, sizeof(handle)))
|
||||
return -EFAULT;
|
||||
|
||||
buf += sizeof(handle);
|
||||
len -= sizeof(handle);
|
||||
/*
|
||||
* For an inline fh, copy through stack to exclude the copy from
|
||||
* usercopy hardening protections.
|
||||
*/
|
||||
fh = fanotify_event_fh(event);
|
||||
if (fh_len <= FANOTIFY_INLINE_FH_LEN) {
|
||||
memcpy(bounce, fh, fh_len);
|
||||
fh = bounce;
|
||||
}
|
||||
if (copy_to_user(buf, fh, fh_len))
|
||||
if (WARN_ON_ONCE(len < fh_len))
|
||||
return -EFAULT;
|
||||
|
||||
/*
|
||||
* For an inline fh and inline file name, copy through stack to exclude
|
||||
* the copy from usercopy hardening protections.
|
||||
*/
|
||||
fh_buf = fanotify_fh_buf(fh);
|
||||
if (fh_len <= FANOTIFY_INLINE_FH_LEN) {
|
||||
memcpy(bounce, fh_buf, fh_len);
|
||||
fh_buf = bounce;
|
||||
}
|
||||
if (copy_to_user(buf, fh_buf, fh_len))
|
||||
return -EFAULT;
|
||||
|
||||
/* Pad with 0's */
|
||||
buf += fh_len;
|
||||
len -= fh_len;
|
||||
|
||||
if (name_len) {
|
||||
/* Copy the filename with terminating null */
|
||||
name_len++;
|
||||
if (WARN_ON_ONCE(len < name_len))
|
||||
return -EFAULT;
|
||||
|
||||
if (copy_to_user(buf, name, name_len))
|
||||
return -EFAULT;
|
||||
|
||||
buf += name_len;
|
||||
len -= name_len;
|
||||
}
|
||||
|
||||
/* Pad with 0's */
|
||||
WARN_ON_ONCE(len < 0 || len >= FANOTIFY_EVENT_ALIGN);
|
||||
if (len > 0 && clear_user(buf, len))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
return info_len;
|
||||
}
|
||||
|
||||
static ssize_t copy_event_to_user(struct fsnotify_group *group,
|
||||
struct fsnotify_event *fsn_event,
|
||||
struct fanotify_event *event,
|
||||
char __user *buf, size_t count)
|
||||
{
|
||||
struct fanotify_event_metadata metadata;
|
||||
struct fanotify_event *event;
|
||||
struct path *path = fanotify_event_path(event);
|
||||
struct file *f = NULL;
|
||||
int ret, fd = FAN_NOFD;
|
||||
|
||||
pr_debug("%s: group=%p event=%p\n", __func__, group, fsn_event);
|
||||
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
|
||||
|
||||
event = container_of(fsn_event, struct fanotify_event, fse);
|
||||
metadata.event_len = FAN_EVENT_METADATA_LEN;
|
||||
metadata.event_len = FAN_EVENT_METADATA_LEN +
|
||||
fanotify_event_info_len(event);
|
||||
metadata.metadata_len = FAN_EVENT_METADATA_LEN;
|
||||
metadata.vers = FANOTIFY_METADATA_VERSION;
|
||||
metadata.reserved = 0;
|
||||
metadata.mask = event->mask & FANOTIFY_OUTGOING_EVENTS;
|
||||
metadata.pid = pid_vnr(event->pid);
|
||||
|
||||
if (fanotify_event_has_path(event)) {
|
||||
fd = create_fd(group, event, &f);
|
||||
if (path && path->mnt && path->dentry) {
|
||||
fd = create_fd(group, path, &f);
|
||||
if (fd < 0)
|
||||
return fd;
|
||||
} else if (fanotify_event_has_fid(event)) {
|
||||
metadata.event_len += fanotify_event_info_len(event);
|
||||
}
|
||||
metadata.fd = fd;
|
||||
|
||||
|
@ -295,15 +336,39 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
|
|||
if (copy_to_user(buf, &metadata, FAN_EVENT_METADATA_LEN))
|
||||
goto out_close_fd;
|
||||
|
||||
if (fanotify_is_perm_event(event->mask))
|
||||
FANOTIFY_PE(fsn_event)->fd = fd;
|
||||
buf += FAN_EVENT_METADATA_LEN;
|
||||
count -= FAN_EVENT_METADATA_LEN;
|
||||
|
||||
if (fanotify_event_has_path(event)) {
|
||||
if (fanotify_is_perm_event(event->mask))
|
||||
FANOTIFY_PERM(event)->fd = fd;
|
||||
|
||||
if (f)
|
||||
fd_install(fd, f);
|
||||
} else if (fanotify_event_has_fid(event)) {
|
||||
ret = copy_fid_to_user(event, buf + FAN_EVENT_METADATA_LEN);
|
||||
|
||||
/* Event info records order is: dir fid + name, child fid */
|
||||
if (fanotify_event_name_len(event)) {
|
||||
struct fanotify_name_event *fne = FANOTIFY_NE(event);
|
||||
|
||||
ret = copy_info_to_user(fanotify_event_fsid(event),
|
||||
fanotify_event_dir_fh(event),
|
||||
fne->name, fne->name_len,
|
||||
buf, count);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
buf += ret;
|
||||
count -= ret;
|
||||
}
|
||||
|
||||
if (fanotify_event_object_fh_len(event)) {
|
||||
ret = copy_info_to_user(fanotify_event_fsid(event),
|
||||
fanotify_event_object_fh(event),
|
||||
NULL, 0, buf, count);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
buf += ret;
|
||||
count -= ret;
|
||||
}
|
||||
|
||||
return metadata.event_len;
|
||||
|
@ -335,7 +400,7 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
|
|||
size_t count, loff_t *pos)
|
||||
{
|
||||
struct fsnotify_group *group;
|
||||
struct fsnotify_event *kevent;
|
||||
struct fanotify_event *event;
|
||||
char __user *start;
|
||||
int ret;
|
||||
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
||||
|
@ -347,13 +412,13 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
|
|||
|
||||
add_wait_queue(&group->notification_waitq, &wait);
|
||||
while (1) {
|
||||
kevent = get_one_event(group, count);
|
||||
if (IS_ERR(kevent)) {
|
||||
ret = PTR_ERR(kevent);
|
||||
event = get_one_event(group, count);
|
||||
if (IS_ERR(event)) {
|
||||
ret = PTR_ERR(event);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!kevent) {
|
||||
if (!event) {
|
||||
ret = -EAGAIN;
|
||||
if (file->f_flags & O_NONBLOCK)
|
||||
break;
|
||||
|
@ -369,7 +434,7 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
|
|||
continue;
|
||||
}
|
||||
|
||||
ret = copy_event_to_user(group, kevent, buf, count);
|
||||
ret = copy_event_to_user(group, event, buf, count);
|
||||
if (unlikely(ret == -EOPENSTALE)) {
|
||||
/*
|
||||
* We cannot report events with stale fd so drop it.
|
||||
|
@ -384,17 +449,17 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
|
|||
* Permission events get queued to wait for response. Other
|
||||
* events can be destroyed now.
|
||||
*/
|
||||
if (!fanotify_is_perm_event(FANOTIFY_E(kevent)->mask)) {
|
||||
fsnotify_destroy_event(group, kevent);
|
||||
if (!fanotify_is_perm_event(event->mask)) {
|
||||
fsnotify_destroy_event(group, &event->fse);
|
||||
} else {
|
||||
if (ret <= 0) {
|
||||
spin_lock(&group->notification_lock);
|
||||
finish_permission_event(group,
|
||||
FANOTIFY_PE(kevent), FAN_DENY);
|
||||
FANOTIFY_PERM(event), FAN_DENY);
|
||||
wake_up(&group->fanotify_data.access_waitq);
|
||||
} else {
|
||||
spin_lock(&group->notification_lock);
|
||||
list_add_tail(&kevent->list,
|
||||
list_add_tail(&event->fse.list,
|
||||
&group->fanotify_data.access_list);
|
||||
spin_unlock(&group->notification_lock);
|
||||
}
|
||||
|
@ -440,8 +505,6 @@ static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t
|
|||
static int fanotify_release(struct inode *ignored, struct file *file)
|
||||
{
|
||||
struct fsnotify_group *group = file->private_data;
|
||||
struct fanotify_perm_event *event;
|
||||
struct fsnotify_event *fsn_event;
|
||||
|
||||
/*
|
||||
* Stop new events from arriving in the notification queue. since
|
||||
|
@ -456,6 +519,8 @@ static int fanotify_release(struct inode *ignored, struct file *file)
|
|||
*/
|
||||
spin_lock(&group->notification_lock);
|
||||
while (!list_empty(&group->fanotify_data.access_list)) {
|
||||
struct fanotify_perm_event *event;
|
||||
|
||||
event = list_first_entry(&group->fanotify_data.access_list,
|
||||
struct fanotify_perm_event, fae.fse.list);
|
||||
list_del_init(&event->fae.fse.list);
|
||||
|
@ -469,12 +534,14 @@ static int fanotify_release(struct inode *ignored, struct file *file)
|
|||
* response is consumed and fanotify_get_response() returns.
|
||||
*/
|
||||
while (!fsnotify_notify_queue_is_empty(group)) {
|
||||
fsn_event = fsnotify_remove_first_event(group);
|
||||
if (!(FANOTIFY_E(fsn_event)->mask & FANOTIFY_PERM_EVENTS)) {
|
||||
struct fanotify_event *event;
|
||||
|
||||
event = FANOTIFY_E(fsnotify_remove_first_event(group));
|
||||
if (!(event->mask & FANOTIFY_PERM_EVENTS)) {
|
||||
spin_unlock(&group->notification_lock);
|
||||
fsnotify_destroy_event(group, fsn_event);
|
||||
fsnotify_destroy_event(group, &event->fse);
|
||||
} else {
|
||||
finish_permission_event(group, FANOTIFY_PE(fsn_event),
|
||||
finish_permission_event(group, FANOTIFY_PERM(event),
|
||||
FAN_ALLOW);
|
||||
}
|
||||
spin_lock(&group->notification_lock);
|
||||
|
@ -824,7 +891,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
|
|||
group->memcg = get_mem_cgroup_from_mm(current->mm);
|
||||
|
||||
oevent = fanotify_alloc_event(group, NULL, FS_Q_OVERFLOW, NULL,
|
||||
FSNOTIFY_EVENT_NONE, NULL);
|
||||
FSNOTIFY_EVENT_NONE, NULL, NULL);
|
||||
if (unlikely(!oevent)) {
|
||||
fd = -ENOMEM;
|
||||
goto out_destroy_group;
|
||||
|
@ -1139,7 +1206,10 @@ static int __init fanotify_user_setup(void)
|
|||
|
||||
fanotify_mark_cache = KMEM_CACHE(fsnotify_mark,
|
||||
SLAB_PANIC|SLAB_ACCOUNT);
|
||||
fanotify_event_cachep = KMEM_CACHE(fanotify_event, SLAB_PANIC);
|
||||
fanotify_fid_event_cachep = KMEM_CACHE(fanotify_fid_event,
|
||||
SLAB_PANIC);
|
||||
fanotify_path_event_cachep = KMEM_CACHE(fanotify_path_event,
|
||||
SLAB_PANIC);
|
||||
if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) {
|
||||
fanotify_perm_event_cachep =
|
||||
KMEM_CACHE(fanotify_perm_event, SLAB_PANIC);
|
||||
|
|
|
@ -143,15 +143,13 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode)
|
|||
}
|
||||
|
||||
/* Notify this dentry's parent about a child's events. */
|
||||
int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
|
||||
int fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data,
|
||||
int data_type)
|
||||
{
|
||||
struct dentry *parent;
|
||||
struct inode *p_inode;
|
||||
int ret = 0;
|
||||
|
||||
if (!dentry)
|
||||
dentry = path->dentry;
|
||||
|
||||
if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
|
||||
return 0;
|
||||
|
||||
|
@ -168,12 +166,7 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
|
|||
mask |= FS_EVENT_ON_CHILD;
|
||||
|
||||
take_dentry_name_snapshot(&name, dentry);
|
||||
if (path)
|
||||
ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
|
||||
&name.name, 0);
|
||||
else
|
||||
ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
|
||||
&name.name, 0);
|
||||
ret = fsnotify(p_inode, mask, data, data_type, &name.name, 0);
|
||||
release_dentry_name_snapshot(&name);
|
||||
}
|
||||
|
||||
|
@ -181,7 +174,7 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
|
|||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__fsnotify_parent);
|
||||
EXPORT_SYMBOL_GPL(fsnotify_parent);
|
||||
|
||||
static int send_to_group(struct inode *to_tell,
|
||||
__u32 mask, const void *data,
|
||||
|
@ -318,6 +311,7 @@ static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info)
|
|||
int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
|
||||
const struct qstr *file_name, u32 cookie)
|
||||
{
|
||||
const struct path *path = fsnotify_data_path(data, data_is);
|
||||
struct fsnotify_iter_info iter_info = {};
|
||||
struct super_block *sb = to_tell->i_sb;
|
||||
struct mount *mnt = NULL;
|
||||
|
@ -325,8 +319,8 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
|
|||
int ret = 0;
|
||||
__u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS);
|
||||
|
||||
if (data_is == FSNOTIFY_EVENT_PATH) {
|
||||
mnt = real_mount(((const struct path *)data)->mnt);
|
||||
if (path) {
|
||||
mnt = real_mount(path->mnt);
|
||||
mnt_or_sb_mask |= mnt->mnt_fsnotify_mask;
|
||||
}
|
||||
/* An event "on child" is not intended for a mount/sb mark */
|
||||
|
@ -389,7 +383,7 @@ static __init int fsnotify_init(void)
|
|||
{
|
||||
int ret;
|
||||
|
||||
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
|
||||
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 26);
|
||||
|
||||
ret = init_srcu_struct(&fsnotify_mark_srcu);
|
||||
if (ret)
|
||||
|
|
|
@ -39,7 +39,7 @@ static bool event_compare(struct fsnotify_event *old_fsn,
|
|||
if (old->mask & FS_IN_IGNORED)
|
||||
return false;
|
||||
if ((old->mask == new->mask) &&
|
||||
(old_fsn->inode == new_fsn->inode) &&
|
||||
(old_fsn->objectid == new_fsn->objectid) &&
|
||||
(old->name_len == new->name_len) &&
|
||||
(!old->name_len || !strcmp(old->name, new->name)))
|
||||
return true;
|
||||
|
@ -61,6 +61,7 @@ int inotify_handle_event(struct fsnotify_group *group,
|
|||
const struct qstr *file_name, u32 cookie,
|
||||
struct fsnotify_iter_info *iter_info)
|
||||
{
|
||||
const struct path *path = fsnotify_data_path(data, data_type);
|
||||
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
|
||||
struct inotify_inode_mark *i_mark;
|
||||
struct inotify_event_info *event;
|
||||
|
@ -73,12 +74,9 @@ int inotify_handle_event(struct fsnotify_group *group,
|
|||
return 0;
|
||||
|
||||
if ((inode_mark->mask & FS_EXCL_UNLINK) &&
|
||||
(data_type == FSNOTIFY_EVENT_PATH)) {
|
||||
const struct path *path = data;
|
||||
path && d_unlinked(path->dentry))
|
||||
return 0;
|
||||
|
||||
if (d_unlinked(path->dentry))
|
||||
return 0;
|
||||
}
|
||||
if (file_name) {
|
||||
len = file_name->len;
|
||||
alloc_len += len + 1;
|
||||
|
@ -118,7 +116,7 @@ int inotify_handle_event(struct fsnotify_group *group,
|
|||
mask &= ~IN_ISDIR;
|
||||
|
||||
fsn_event = &event->fse;
|
||||
fsnotify_init_event(fsn_event, inode);
|
||||
fsnotify_init_event(fsn_event, (unsigned long)inode);
|
||||
event->mask = mask;
|
||||
event->wd = i_mark->wd;
|
||||
event->sync_cookie = cookie;
|
||||
|
|
|
@ -635,7 +635,7 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events)
|
|||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
group->overflow_event = &oevent->fse;
|
||||
fsnotify_init_event(group->overflow_event, NULL);
|
||||
fsnotify_init_event(group->overflow_event, 0);
|
||||
oevent->mask = FS_Q_OVERFLOW;
|
||||
oevent->wd = -1;
|
||||
oevent->sync_cookie = 0;
|
||||
|
|
|
@ -47,7 +47,8 @@
|
|||
* Directory entry modification events - reported only to directory
|
||||
* where entry is modified and not to a watching parent.
|
||||
*/
|
||||
#define FANOTIFY_DIRENT_EVENTS (FAN_MOVE | FAN_CREATE | FAN_DELETE)
|
||||
#define FANOTIFY_DIRENT_EVENTS (FAN_MOVE | FAN_CREATE | FAN_DELETE | \
|
||||
FAN_DIR_MODIFY)
|
||||
|
||||
/* Events that can only be reported with data type FSNOTIFY_EVENT_INODE */
|
||||
#define FANOTIFY_INODE_EVENTS (FANOTIFY_DIRENT_EVENTS | \
|
||||
|
|
|
@ -18,39 +18,63 @@
|
|||
#include <linux/bug.h>
|
||||
|
||||
/*
|
||||
* Notify this @dir inode about a change in the directory entry @dentry.
|
||||
* Notify this @dir inode about a change in a child directory entry.
|
||||
* The directory entry may have turned positive or negative or its inode may
|
||||
* have changed (i.e. renamed over).
|
||||
*
|
||||
* Unlike fsnotify_parent(), the event will be reported regardless of the
|
||||
* FS_EVENT_ON_CHILD mask on the parent inode.
|
||||
*/
|
||||
static inline int fsnotify_dirent(struct inode *dir, struct dentry *dentry,
|
||||
__u32 mask)
|
||||
static inline void fsnotify_name(struct inode *dir, __u32 mask,
|
||||
struct inode *child,
|
||||
const struct qstr *name, u32 cookie)
|
||||
{
|
||||
return fsnotify(dir, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
|
||||
&dentry->d_name, 0);
|
||||
fsnotify(dir, mask, child, FSNOTIFY_EVENT_INODE, name, cookie);
|
||||
/*
|
||||
* Send another flavor of the event without child inode data and
|
||||
* without the specific event type (e.g. FS_CREATE|FS_IS_DIR).
|
||||
* The name is relative to the dir inode the event is reported to.
|
||||
*/
|
||||
fsnotify(dir, FS_DIR_MODIFY, dir, FSNOTIFY_EVENT_INODE, name, 0);
|
||||
}
|
||||
|
||||
/* Notify this dentry's parent about a child's events. */
|
||||
static inline int fsnotify_parent(const struct path *path,
|
||||
struct dentry *dentry, __u32 mask)
|
||||
static inline void fsnotify_dirent(struct inode *dir, struct dentry *dentry,
|
||||
__u32 mask)
|
||||
{
|
||||
if (!dentry)
|
||||
dentry = path->dentry;
|
||||
|
||||
return __fsnotify_parent(path, dentry, mask);
|
||||
fsnotify_name(dir, mask, d_inode(dentry), &dentry->d_name, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Simple wrapper to consolidate calls fsnotify_parent()/fsnotify() when
|
||||
* an event is on a path.
|
||||
* Simple wrappers to consolidate calls fsnotify_parent()/fsnotify() when
|
||||
* an event is on a file/dentry.
|
||||
*/
|
||||
static inline int fsnotify_path(struct inode *inode, const struct path *path,
|
||||
__u32 mask)
|
||||
static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
|
||||
{
|
||||
int ret = fsnotify_parent(path, NULL, mask);
|
||||
struct inode *inode = d_inode(dentry);
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
fsnotify_parent(dentry, mask, inode, FSNOTIFY_EVENT_INODE);
|
||||
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
|
||||
}
|
||||
|
||||
static inline int fsnotify_file(struct file *file, __u32 mask)
|
||||
{
|
||||
const struct path *path = &file->f_path;
|
||||
struct inode *inode = file_inode(file);
|
||||
int ret;
|
||||
|
||||
if (file->f_mode & FMODE_NONOTIFY)
|
||||
return 0;
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
ret = fsnotify_parent(path->dentry, mask, path, FSNOTIFY_EVENT_PATH);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
|
||||
}
|
||||
|
||||
|
@ -58,19 +82,16 @@ static inline int fsnotify_path(struct inode *inode, const struct path *path,
|
|||
static inline int fsnotify_perm(struct file *file, int mask)
|
||||
{
|
||||
int ret;
|
||||
const struct path *path = &file->f_path;
|
||||
struct inode *inode = file_inode(file);
|
||||
__u32 fsnotify_mask = 0;
|
||||
|
||||
if (file->f_mode & FMODE_NONOTIFY)
|
||||
return 0;
|
||||
if (!(mask & (MAY_READ | MAY_OPEN)))
|
||||
return 0;
|
||||
|
||||
if (mask & MAY_OPEN) {
|
||||
fsnotify_mask = FS_OPEN_PERM;
|
||||
|
||||
if (file->f_flags & __FMODE_EXEC) {
|
||||
ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM);
|
||||
ret = fsnotify_file(file, FS_OPEN_EXEC_PERM);
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
|
@ -79,10 +100,7 @@ static inline int fsnotify_perm(struct file *file, int mask)
|
|||
fsnotify_mask = FS_ACCESS_PERM;
|
||||
}
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
fsnotify_mask |= FS_ISDIR;
|
||||
|
||||
return fsnotify_path(inode, path, fsnotify_mask);
|
||||
return fsnotify_file(file, fsnotify_mask);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -122,10 +140,8 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
|
|||
mask |= FS_ISDIR;
|
||||
}
|
||||
|
||||
fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name,
|
||||
fs_cookie);
|
||||
fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
|
||||
fs_cookie);
|
||||
fsnotify_name(old_dir, old_dir_mask, source, old_name, fs_cookie);
|
||||
fsnotify_name(new_dir, new_dir_mask, source, new_name, fs_cookie);
|
||||
|
||||
if (target)
|
||||
fsnotify_link_count(target);
|
||||
|
@ -180,12 +196,13 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
|
|||
* Note: We have to pass also the linked inode ptr as some filesystems leave
|
||||
* new_dentry->d_inode NULL and instantiate inode pointer later
|
||||
*/
|
||||
static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
|
||||
static inline void fsnotify_link(struct inode *dir, struct inode *inode,
|
||||
struct dentry *new_dentry)
|
||||
{
|
||||
fsnotify_link_count(inode);
|
||||
audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
|
||||
|
||||
fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, &new_dentry->d_name, 0);
|
||||
fsnotify_name(dir, FS_CREATE, inode, &new_dentry->d_name, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -229,15 +246,7 @@ static inline void fsnotify_rmdir(struct inode *dir, struct dentry *dentry)
|
|||
*/
|
||||
static inline void fsnotify_access(struct file *file)
|
||||
{
|
||||
const struct path *path = &file->f_path;
|
||||
struct inode *inode = file_inode(file);
|
||||
__u32 mask = FS_ACCESS;
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
if (!(file->f_mode & FMODE_NONOTIFY))
|
||||
fsnotify_path(inode, path, mask);
|
||||
fsnotify_file(file, FS_ACCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -245,15 +254,7 @@ static inline void fsnotify_access(struct file *file)
|
|||
*/
|
||||
static inline void fsnotify_modify(struct file *file)
|
||||
{
|
||||
const struct path *path = &file->f_path;
|
||||
struct inode *inode = file_inode(file);
|
||||
__u32 mask = FS_MODIFY;
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
if (!(file->f_mode & FMODE_NONOTIFY))
|
||||
fsnotify_path(inode, path, mask);
|
||||
fsnotify_file(file, FS_MODIFY);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -261,16 +262,12 @@ static inline void fsnotify_modify(struct file *file)
|
|||
*/
|
||||
static inline void fsnotify_open(struct file *file)
|
||||
{
|
||||
const struct path *path = &file->f_path;
|
||||
struct inode *inode = file_inode(file);
|
||||
__u32 mask = FS_OPEN;
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
if (file->f_flags & __FMODE_EXEC)
|
||||
mask |= FS_OPEN_EXEC;
|
||||
|
||||
fsnotify_path(inode, path, mask);
|
||||
fsnotify_file(file, mask);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -278,16 +275,10 @@ static inline void fsnotify_open(struct file *file)
|
|||
*/
|
||||
static inline void fsnotify_close(struct file *file)
|
||||
{
|
||||
const struct path *path = &file->f_path;
|
||||
struct inode *inode = file_inode(file);
|
||||
fmode_t mode = file->f_mode;
|
||||
__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
|
||||
__u32 mask = (file->f_mode & FMODE_WRITE) ? FS_CLOSE_WRITE :
|
||||
FS_CLOSE_NOWRITE;
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
if (!(file->f_mode & FMODE_NONOTIFY))
|
||||
fsnotify_path(inode, path, mask);
|
||||
fsnotify_file(file, mask);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -295,14 +286,7 @@ static inline void fsnotify_close(struct file *file)
|
|||
*/
|
||||
static inline void fsnotify_xattr(struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
__u32 mask = FS_ATTRIB;
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
fsnotify_parent(NULL, dentry, mask);
|
||||
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
|
||||
fsnotify_dentry(dentry, FS_ATTRIB);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -311,7 +295,6 @@ static inline void fsnotify_xattr(struct dentry *dentry)
|
|||
*/
|
||||
static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
__u32 mask = 0;
|
||||
|
||||
if (ia_valid & ATTR_UID)
|
||||
|
@ -332,13 +315,8 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
|
|||
if (ia_valid & ATTR_MODE)
|
||||
mask |= FS_ATTRIB;
|
||||
|
||||
if (mask) {
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
mask |= FS_ISDIR;
|
||||
|
||||
fsnotify_parent(NULL, dentry, mask);
|
||||
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
|
||||
}
|
||||
if (mask)
|
||||
fsnotify_dentry(dentry, mask);
|
||||
}
|
||||
|
||||
#endif /* _LINUX_FS_NOTIFY_H */
|
||||
|
|
|
@ -47,18 +47,18 @@
|
|||
#define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
|
||||
#define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
|
||||
#define FS_OPEN_EXEC_PERM 0x00040000 /* open/exec event in a permission hook */
|
||||
#define FS_DIR_MODIFY 0x00080000 /* Directory entry was modified */
|
||||
|
||||
#define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
|
||||
#define FS_ISDIR 0x40000000 /* event occurred against dir */
|
||||
#define FS_IN_ONESHOT 0x80000000 /* only send event once */
|
||||
|
||||
#define FS_DN_RENAME 0x10000000 /* file renamed */
|
||||
#define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
|
||||
|
||||
/* This inode cares about things that happen to its children. Always set for
|
||||
* dnotify and inotify. */
|
||||
#define FS_EVENT_ON_CHILD 0x08000000
|
||||
|
||||
#define FS_DN_RENAME 0x10000000 /* file renamed */
|
||||
#define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
|
||||
#define FS_ISDIR 0x40000000 /* event occurred against dir */
|
||||
#define FS_IN_ONESHOT 0x80000000 /* only send event once */
|
||||
|
||||
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
|
||||
|
||||
/*
|
||||
|
@ -67,7 +67,8 @@
|
|||
* The watching parent may get an FS_ATTRIB|FS_EVENT_ON_CHILD event
|
||||
* when a directory entry inside a child subdir changes.
|
||||
*/
|
||||
#define ALL_FSNOTIFY_DIRENT_EVENTS (FS_CREATE | FS_DELETE | FS_MOVE)
|
||||
#define ALL_FSNOTIFY_DIRENT_EVENTS (FS_CREATE | FS_DELETE | FS_MOVE | \
|
||||
FS_DIR_MODIFY)
|
||||
|
||||
#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
|
||||
FS_OPEN_EXEC_PERM)
|
||||
|
@ -133,8 +134,7 @@ struct fsnotify_ops {
|
|||
*/
|
||||
struct fsnotify_event {
|
||||
struct list_head list;
|
||||
/* inode may ONLY be dereferenced during handle_event(). */
|
||||
struct inode *inode; /* either the inode the event happened to or its parent */
|
||||
unsigned long objectid; /* identifier for queue merges */
|
||||
};
|
||||
|
||||
/*
|
||||
|
@ -213,10 +213,36 @@ struct fsnotify_group {
|
|||
};
|
||||
};
|
||||
|
||||
/* when calling fsnotify tell it if the data is a path or inode */
|
||||
#define FSNOTIFY_EVENT_NONE 0
|
||||
#define FSNOTIFY_EVENT_PATH 1
|
||||
#define FSNOTIFY_EVENT_INODE 2
|
||||
/* When calling fsnotify tell it if the data is a path or inode */
|
||||
enum fsnotify_data_type {
|
||||
FSNOTIFY_EVENT_NONE,
|
||||
FSNOTIFY_EVENT_PATH,
|
||||
FSNOTIFY_EVENT_INODE,
|
||||
};
|
||||
|
||||
static inline const struct inode *fsnotify_data_inode(const void *data,
|
||||
int data_type)
|
||||
{
|
||||
switch (data_type) {
|
||||
case FSNOTIFY_EVENT_INODE:
|
||||
return data;
|
||||
case FSNOTIFY_EVENT_PATH:
|
||||
return d_inode(((const struct path *)data)->dentry);
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static inline const struct path *fsnotify_data_path(const void *data,
|
||||
int data_type)
|
||||
{
|
||||
switch (data_type) {
|
||||
case FSNOTIFY_EVENT_PATH:
|
||||
return data;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
enum fsnotify_obj_type {
|
||||
FSNOTIFY_OBJ_TYPE_INODE,
|
||||
|
@ -351,9 +377,10 @@ struct fsnotify_mark {
|
|||
/* called from the vfs helpers */
|
||||
|
||||
/* main fsnotify call to send events */
|
||||
extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
|
||||
const struct qstr *name, u32 cookie);
|
||||
extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
|
||||
extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data,
|
||||
int data_type, const struct qstr *name, u32 cookie);
|
||||
extern int fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data,
|
||||
int data_type);
|
||||
extern void __fsnotify_inode_delete(struct inode *inode);
|
||||
extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
|
||||
extern void fsnotify_sb_delete(struct super_block *sb);
|
||||
|
@ -500,21 +527,22 @@ extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
|
|||
extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
|
||||
|
||||
static inline void fsnotify_init_event(struct fsnotify_event *event,
|
||||
struct inode *inode)
|
||||
unsigned long objectid)
|
||||
{
|
||||
INIT_LIST_HEAD(&event->list);
|
||||
event->inode = inode;
|
||||
event->objectid = objectid;
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
|
||||
const struct qstr *name, u32 cookie)
|
||||
static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data,
|
||||
int data_type, const struct qstr *name, u32 cookie)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
|
||||
static inline int fsnotify_parent(struct dentry *dentry, __u32 mask,
|
||||
const void *data, int data_type)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
|
|
@ -24,10 +24,11 @@
|
|||
#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
|
||||
#define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
|
||||
#define FAN_OPEN_EXEC_PERM 0x00040000 /* File open/exec in perm check */
|
||||
#define FAN_DIR_MODIFY 0x00080000 /* Directory entry was modified */
|
||||
|
||||
#define FAN_ONDIR 0x40000000 /* event occurred against dir */
|
||||
#define FAN_EVENT_ON_CHILD 0x08000000 /* Interested in child events */
|
||||
|
||||
#define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */
|
||||
#define FAN_ONDIR 0x40000000 /* Event occurred against dir */
|
||||
|
||||
/* helper events */
|
||||
#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
|
||||
|
@ -116,6 +117,7 @@ struct fanotify_event_metadata {
|
|||
};
|
||||
|
||||
#define FAN_EVENT_INFO_TYPE_FID 1
|
||||
#define FAN_EVENT_INFO_TYPE_DFID_NAME 2
|
||||
|
||||
/* Variable length info record following event metadata */
|
||||
struct fanotify_event_info_header {
|
||||
|
@ -124,7 +126,12 @@ struct fanotify_event_info_header {
|
|||
__u16 len;
|
||||
};
|
||||
|
||||
/* Unique file identifier info record */
|
||||
/*
|
||||
* Unique file identifier info record. This is used both for
|
||||
* FAN_EVENT_INFO_TYPE_FID records and for FAN_EVENT_INFO_TYPE_DFID_NAME
|
||||
* records. For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null
|
||||
* terminated name immediately after the file handle.
|
||||
*/
|
||||
struct fanotify_event_info_fid {
|
||||
struct fanotify_event_info_header hdr;
|
||||
__kernel_fsid_t fsid;
|
||||
|
|
|
@ -160,23 +160,14 @@ static int audit_mark_handle_event(struct fsnotify_group *group,
|
|||
{
|
||||
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
|
||||
struct audit_fsnotify_mark *audit_mark;
|
||||
const struct inode *inode = NULL;
|
||||
const struct inode *inode = fsnotify_data_inode(data, data_type);
|
||||
|
||||
audit_mark = container_of(inode_mark, struct audit_fsnotify_mark, mark);
|
||||
|
||||
BUG_ON(group != audit_fsnotify_group);
|
||||
|
||||
switch (data_type) {
|
||||
case (FSNOTIFY_EVENT_PATH):
|
||||
inode = ((const struct path *)data)->dentry->d_inode;
|
||||
break;
|
||||
case (FSNOTIFY_EVENT_INODE):
|
||||
inode = (const struct inode *)data;
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
if (WARN_ON(!inode))
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (mask & (FS_CREATE|FS_MOVED_TO|FS_DELETE|FS_MOVED_FROM)) {
|
||||
if (audit_compare_dname_path(dname, audit_mark->path, AUDIT_NAME_FULL))
|
||||
|
|
|
@ -471,25 +471,13 @@ static int audit_watch_handle_event(struct fsnotify_group *group,
|
|||
struct fsnotify_iter_info *iter_info)
|
||||
{
|
||||
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
|
||||
const struct inode *inode;
|
||||
const struct inode *inode = fsnotify_data_inode(data, data_type);
|
||||
struct audit_parent *parent;
|
||||
|
||||
parent = container_of(inode_mark, struct audit_parent, mark);
|
||||
|
||||
BUG_ON(group != audit_watch_group);
|
||||
|
||||
switch (data_type) {
|
||||
case (FSNOTIFY_EVENT_PATH):
|
||||
inode = d_backing_inode(((const struct path *)data)->dentry);
|
||||
break;
|
||||
case (FSNOTIFY_EVENT_INODE):
|
||||
inode = (const struct inode *)data;
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
inode = NULL;
|
||||
break;
|
||||
}
|
||||
WARN_ON(!inode);
|
||||
|
||||
if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
|
||||
audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
|
||||
|
|
Loading…
Reference in a new issue