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-----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEq1nRK9aeMoq1VSgcnJ2qBz9kQNkFAlwbm5YACgkQnJ2qBz9k QNnF5wf+L9lWe4LzGf3sCc45JFtcsvLtcYd0XSn93ATRPSIxNYCCDEdvJ9UGfGhG +2y4Z42KBWkqg2Dx8W2yiQjP1RxJTbWIAEE7uKKyWIojNMbtpjSjRw/n7VmCG7m/ ZHhO3XITHYRCVruIKVfwC0a9zPNWD6RD4+IhHRrZomC1ZrfTzs0OBc6PADXLchdR 0QRkpWlomD3CASGVioYbOFqX3pcDJWUdoFvOyMu2sELkJzAJjC7spB+MfoFeRJsA QEUoRAdWCSFtxcuM6bkNMc1zXig3niLBka/ozXvwA0192rbOcyGvua3PwqYTdqnu Bea36CD2G+ta0cBv1M5s7e87surttw== =wdFw -----END PGP SIGNATURE----- Merge tag 'fsnotify_for_v4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull fsnotify updates from Jan Kara: "Support for new FAN_OPEN_EXEC event and couple of cleanups around fsnotify" * tag 'fsnotify_for_v4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: fanotify: Use inode_is_open_for_write fanotify: Make sure to check event_len when copying fsnotify/fdinfo: include fdinfo.h for inotify_show_fdinfo() fanotify: introduce new event mask FAN_OPEN_EXEC_PERM fsnotify: refactor fsnotify_parent()/fsnotify() paired calls when event is on path fanotify: introduce new event mask FAN_OPEN_EXEC fanotify: return only user requested event types in event mask
This commit is contained in:
commit
4b0a383ad7
@ -89,7 +89,13 @@ static int fanotify_get_response(struct fsnotify_group *group,
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return ret;
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return ret;
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}
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}
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static bool fanotify_should_send_event(struct fsnotify_iter_info *iter_info,
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/*
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* This function returns a mask for an event that only contains the flags
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* that have been specifically requested by the user. Flags that may have
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* been included within the event mask, but have not been explicitly
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* requested by the user, will not be present in the returned mask.
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*/
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static u32 fanotify_group_event_mask(struct fsnotify_iter_info *iter_info,
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u32 event_mask, const void *data,
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u32 event_mask, const void *data,
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int data_type)
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int data_type)
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{
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{
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@ -101,14 +107,14 @@ static bool fanotify_should_send_event(struct fsnotify_iter_info *iter_info,
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pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
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pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
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__func__, iter_info->report_mask, event_mask, data, data_type);
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__func__, iter_info->report_mask, event_mask, data, data_type);
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/* if we don't have enough info to send an event to userspace say no */
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/* If we don't have enough info to send an event to userspace say no */
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if (data_type != FSNOTIFY_EVENT_PATH)
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if (data_type != FSNOTIFY_EVENT_PATH)
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return false;
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return 0;
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/* sorry, fanotify only gives a damn about files and dirs */
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/* Sorry, fanotify only gives a damn about files and dirs */
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if (!d_is_reg(path->dentry) &&
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if (!d_is_reg(path->dentry) &&
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!d_can_lookup(path->dentry))
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!d_can_lookup(path->dentry))
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return false;
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return 0;
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fsnotify_foreach_obj_type(type) {
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fsnotify_foreach_obj_type(type) {
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if (!fsnotify_iter_should_report_type(iter_info, type))
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if (!fsnotify_iter_should_report_type(iter_info, type))
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@ -129,13 +135,10 @@ static bool fanotify_should_send_event(struct fsnotify_iter_info *iter_info,
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if (d_is_dir(path->dentry) &&
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if (d_is_dir(path->dentry) &&
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!(marks_mask & FS_ISDIR & ~marks_ignored_mask))
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!(marks_mask & FS_ISDIR & ~marks_ignored_mask))
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return false;
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return 0;
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if (event_mask & FANOTIFY_OUTGOING_EVENTS &
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return event_mask & FANOTIFY_OUTGOING_EVENTS & marks_mask &
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marks_mask & ~marks_ignored_mask)
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~marks_ignored_mask;
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return true;
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return false;
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}
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}
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struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
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struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
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@ -207,10 +210,13 @@ static int fanotify_handle_event(struct fsnotify_group *group,
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BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
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BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
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BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
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BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
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BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
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BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
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BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
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BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
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BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 10);
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BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 12);
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if (!fanotify_should_send_event(iter_info, mask, data, data_type))
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mask = fanotify_group_event_mask(iter_info, mask, data, data_type);
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if (!mask)
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return 0;
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return 0;
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pr_debug("%s: group=%p inode=%p mask=%x\n", __func__, group, inode,
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pr_debug("%s: group=%p inode=%p mask=%x\n", __func__, group, inode,
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@ -206,7 +206,7 @@ static int process_access_response(struct fsnotify_group *group,
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static ssize_t copy_event_to_user(struct fsnotify_group *group,
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static ssize_t copy_event_to_user(struct fsnotify_group *group,
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struct fsnotify_event *event,
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struct fsnotify_event *event,
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char __user *buf)
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char __user *buf, size_t count)
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{
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{
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struct fanotify_event_metadata fanotify_event_metadata;
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struct fanotify_event_metadata fanotify_event_metadata;
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struct file *f;
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struct file *f;
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@ -220,6 +220,12 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
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fd = fanotify_event_metadata.fd;
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fd = fanotify_event_metadata.fd;
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ret = -EFAULT;
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ret = -EFAULT;
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/*
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* Sanity check copy size in case get_one_event() and
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* fill_event_metadata() event_len sizes ever get out of sync.
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*/
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if (WARN_ON_ONCE(fanotify_event_metadata.event_len > count))
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goto out_close_fd;
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if (copy_to_user(buf, &fanotify_event_metadata,
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if (copy_to_user(buf, &fanotify_event_metadata,
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fanotify_event_metadata.event_len))
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fanotify_event_metadata.event_len))
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goto out_close_fd;
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goto out_close_fd;
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@ -295,7 +301,7 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
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continue;
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continue;
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}
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}
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ret = copy_event_to_user(group, kevent, buf);
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ret = copy_event_to_user(group, kevent, buf, count);
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if (unlikely(ret == -EOPENSTALE)) {
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if (unlikely(ret == -EOPENSTALE)) {
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/*
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/*
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* We cannot report events with stale fd so drop it.
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* We cannot report events with stale fd so drop it.
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@ -669,7 +675,7 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
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*/
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*/
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if ((flags & FAN_MARK_IGNORED_MASK) &&
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if ((flags & FAN_MARK_IGNORED_MASK) &&
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!(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
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!(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
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(atomic_read(&inode->i_writecount) > 0))
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inode_is_open_for_write(inode))
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return 0;
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return 0;
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return fanotify_add_mark(group, &inode->i_fsnotify_marks,
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return fanotify_add_mark(group, &inode->i_fsnotify_marks,
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@ -15,6 +15,7 @@
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#include <linux/exportfs.h>
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#include <linux/exportfs.h>
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#include "inotify/inotify.h"
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#include "inotify/inotify.h"
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#include "fdinfo.h"
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#include "fsnotify.h"
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#include "fsnotify.h"
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#if defined(CONFIG_PROC_FS)
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#if defined(CONFIG_PROC_FS)
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@ -401,7 +401,7 @@ static __init int fsnotify_init(void)
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{
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{
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int ret;
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int ret;
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BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
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BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
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ret = init_srcu_struct(&fsnotify_mark_srcu);
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ret = init_srcu_struct(&fsnotify_mark_srcu);
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if (ret)
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if (ret)
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@ -37,10 +37,11 @@
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/* Events that user can request to be notified on */
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/* Events that user can request to be notified on */
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#define FANOTIFY_EVENTS (FAN_ACCESS | FAN_MODIFY | \
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#define FANOTIFY_EVENTS (FAN_ACCESS | FAN_MODIFY | \
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FAN_CLOSE | FAN_OPEN)
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FAN_CLOSE | FAN_OPEN | FAN_OPEN_EXEC)
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/* Events that require a permission response from user */
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/* Events that require a permission response from user */
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#define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM)
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#define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM | \
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FAN_OPEN_EXEC_PERM)
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/* Extra flags that may be reported with event or control handling of events */
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/* Extra flags that may be reported with event or control handling of events */
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#define FANOTIFY_EVENT_FLAGS (FAN_EVENT_ON_CHILD | FAN_ONDIR)
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#define FANOTIFY_EVENT_FLAGS (FAN_EVENT_ON_CHILD | FAN_ONDIR)
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@ -26,30 +26,46 @@ static inline int fsnotify_parent(const struct path *path, struct dentry *dentry
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return __fsnotify_parent(path, dentry, mask);
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return __fsnotify_parent(path, dentry, mask);
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}
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}
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/* simple call site for access decisions */
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/*
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* Simple wrapper to consolidate calls fsnotify_parent()/fsnotify() when
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* an event is on a path.
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*/
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static inline int fsnotify_path(struct inode *inode, const struct path *path,
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__u32 mask)
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{
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int ret = fsnotify_parent(path, NULL, mask);
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if (ret)
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return ret;
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return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
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}
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/* Simple call site for access decisions */
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static inline int fsnotify_perm(struct file *file, int mask)
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static inline int fsnotify_perm(struct file *file, int mask)
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{
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{
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int ret;
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const struct path *path = &file->f_path;
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const struct path *path = &file->f_path;
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struct inode *inode = file_inode(file);
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struct inode *inode = file_inode(file);
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__u32 fsnotify_mask = 0;
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__u32 fsnotify_mask = 0;
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int ret;
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if (file->f_mode & FMODE_NONOTIFY)
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if (file->f_mode & FMODE_NONOTIFY)
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return 0;
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return 0;
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if (!(mask & (MAY_READ | MAY_OPEN)))
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if (!(mask & (MAY_READ | MAY_OPEN)))
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return 0;
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return 0;
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if (mask & MAY_OPEN)
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if (mask & MAY_OPEN) {
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fsnotify_mask = FS_OPEN_PERM;
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fsnotify_mask = FS_OPEN_PERM;
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else if (mask & MAY_READ)
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if (file->f_flags & __FMODE_EXEC) {
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ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM);
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if (ret)
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return ret;
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}
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} else if (mask & MAY_READ) {
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fsnotify_mask = FS_ACCESS_PERM;
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fsnotify_mask = FS_ACCESS_PERM;
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else
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}
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BUG();
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ret = fsnotify_parent(path, NULL, fsnotify_mask);
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return fsnotify_path(inode, path, fsnotify_mask);
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if (ret)
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return ret;
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return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
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}
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}
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/*
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/*
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@ -180,10 +196,8 @@ static inline void fsnotify_access(struct file *file)
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if (S_ISDIR(inode->i_mode))
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if (S_ISDIR(inode->i_mode))
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mask |= FS_ISDIR;
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mask |= FS_ISDIR;
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|
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if (!(file->f_mode & FMODE_NONOTIFY)) {
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if (!(file->f_mode & FMODE_NONOTIFY))
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fsnotify_parent(path, NULL, mask);
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fsnotify_path(inode, path, mask);
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fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
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|
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}
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|
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}
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}
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|
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/*
|
/*
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@ -198,10 +212,8 @@ static inline void fsnotify_modify(struct file *file)
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if (S_ISDIR(inode->i_mode))
|
if (S_ISDIR(inode->i_mode))
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mask |= FS_ISDIR;
|
mask |= FS_ISDIR;
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|
|
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if (!(file->f_mode & FMODE_NONOTIFY)) {
|
if (!(file->f_mode & FMODE_NONOTIFY))
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fsnotify_parent(path, NULL, mask);
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fsnotify_path(inode, path, mask);
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fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
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|
||||||
}
|
|
||||||
}
|
}
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||||||
|
|
||||||
/*
|
/*
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||||||
@ -215,9 +227,10 @@ static inline void fsnotify_open(struct file *file)
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|||||||
|
|
||||||
if (S_ISDIR(inode->i_mode))
|
if (S_ISDIR(inode->i_mode))
|
||||||
mask |= FS_ISDIR;
|
mask |= FS_ISDIR;
|
||||||
|
if (file->f_flags & __FMODE_EXEC)
|
||||||
|
mask |= FS_OPEN_EXEC;
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|
|
||||||
fsnotify_parent(path, NULL, mask);
|
fsnotify_path(inode, path, mask);
|
||||||
fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
/*
|
/*
|
||||||
@ -233,10 +246,8 @@ static inline void fsnotify_close(struct file *file)
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|||||||
if (S_ISDIR(inode->i_mode))
|
if (S_ISDIR(inode->i_mode))
|
||||||
mask |= FS_ISDIR;
|
mask |= FS_ISDIR;
|
||||||
|
|
||||||
if (!(file->f_mode & FMODE_NONOTIFY)) {
|
if (!(file->f_mode & FMODE_NONOTIFY))
|
||||||
fsnotify_parent(path, NULL, mask);
|
fsnotify_path(inode, path, mask);
|
||||||
fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
@ -38,6 +38,7 @@
|
|||||||
#define FS_DELETE 0x00000200 /* Subfile was deleted */
|
#define FS_DELETE 0x00000200 /* Subfile was deleted */
|
||||||
#define FS_DELETE_SELF 0x00000400 /* Self was deleted */
|
#define FS_DELETE_SELF 0x00000400 /* Self was deleted */
|
||||||
#define FS_MOVE_SELF 0x00000800 /* Self was moved */
|
#define FS_MOVE_SELF 0x00000800 /* Self was moved */
|
||||||
|
#define FS_OPEN_EXEC 0x00001000 /* File was opened for exec */
|
||||||
|
|
||||||
#define FS_UNMOUNT 0x00002000 /* inode on umount fs */
|
#define FS_UNMOUNT 0x00002000 /* inode on umount fs */
|
||||||
#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
|
#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
|
||||||
@ -45,6 +46,7 @@
|
|||||||
|
|
||||||
#define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
|
#define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
|
||||||
#define FS_ACCESS_PERM 0x00020000 /* access event in a permissions 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_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
|
#define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
|
||||||
#define FS_ISDIR 0x40000000 /* event occurred against dir */
|
#define FS_ISDIR 0x40000000 /* event occurred against dir */
|
||||||
@ -62,11 +64,13 @@
|
|||||||
#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
|
#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
|
||||||
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
|
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
|
||||||
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
|
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
|
||||||
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM)
|
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM | \
|
||||||
|
FS_OPEN_EXEC | FS_OPEN_EXEC_PERM)
|
||||||
|
|
||||||
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
|
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
|
||||||
|
|
||||||
#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
|
#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
|
||||||
|
FS_OPEN_EXEC_PERM)
|
||||||
|
|
||||||
/* Events that can be reported to backends */
|
/* Events that can be reported to backends */
|
||||||
#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
|
#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
|
||||||
@ -74,7 +78,8 @@
|
|||||||
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
|
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
|
||||||
FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
|
FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
|
||||||
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
|
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
|
||||||
FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME)
|
FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME | \
|
||||||
|
FS_OPEN_EXEC | FS_OPEN_EXEC_PERM)
|
||||||
|
|
||||||
/* Extra flags that may be reported with event or control handling of events */
|
/* Extra flags that may be reported with event or control handling of events */
|
||||||
#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
|
#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
|
||||||
|
@ -10,11 +10,13 @@
|
|||||||
#define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
|
#define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
|
||||||
#define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
|
#define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
|
||||||
#define FAN_OPEN 0x00000020 /* File was opened */
|
#define FAN_OPEN 0x00000020 /* File was opened */
|
||||||
|
#define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
|
||||||
|
|
||||||
#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
|
#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
|
||||||
|
|
||||||
#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
|
#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
|
||||||
#define FAN_ACCESS_PERM 0x00020000 /* File accessed 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_ONDIR 0x40000000 /* event occurred against dir */
|
#define FAN_ONDIR 0x40000000 /* event occurred against dir */
|
||||||
|
|
||||||
|
Loading…
Reference in New Issue
Block a user