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Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify

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* 'for-linus' of git://git.infradead.org/users/eparis/notify:
  fsnotify: drop two useless bools in the fnsotify main loop
  fsnotify: fix list walk order
  fanotify: Return EPERM when a process is not privileged
  fanotify: resize pid and reorder structure
  fanotify: drop duplicate pr_debug statement
  fanotify: flush outstanding perm requests on group destroy
  fsnotify: fix ignored mask handling between inode and vfsmount marks
  fanotify: add MAINTAINERS entry
  fsnotify: reset used_inode and used_vfsmount on each pass
  fanotify: do not dereference inode_mark when it is unset
This commit is contained in:
Linus Torvalds 2010-08-28 14:11:04 -07:00
commit 30c0f6a049
6 changed files with 74 additions and 46 deletions
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6
MAINTAINERS
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@ -2296,6 +2296,12 @@ S: Maintained
F: Documentation/hwmon/f71805f
F: drivers/hwmon/f71805f.c
FANOTIFY
M: Eric Paris <eparis@redhat.com>
S: Maintained
F: fs/notify/fanotify/
F: include/linux/fanotify.h
FARSYNC SYNCHRONOUS DRIVER
M: Kevin Curtis <kevin.curtis@farsite.co.uk>
W: http://www.farsite.co.uk/

3
fs/notify/fanotify/fanotify.c
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@ -165,9 +165,6 @@ static bool fanotify_should_send_event(struct fsnotify_group *group,
"mask=%x data=%p data_type=%d\n", __func__, group, to_tell,
inode_mark, vfsmnt_mark, event_mask, data, data_type);
pr_debug("%s: group=%p vfsmount_mark=%p inode_mark=%p mask=%x\n",
__func__, group, vfsmnt_mark, inode_mark, event_mask);
/* sorry, fanotify only gives a damn about files and dirs */
if (!S_ISREG(to_tell->i_mode) &&
!S_ISDIR(to_tell->i_mode))

29
fs/notify/fanotify/fanotify_user.c
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@ -195,6 +195,14 @@ static int prepare_for_access_response(struct fsnotify_group *group,
re->fd = fd;
mutex_lock(&group->fanotify_data.access_mutex);
if (group->fanotify_data.bypass_perm) {
mutex_unlock(&group->fanotify_data.access_mutex);
kmem_cache_free(fanotify_response_event_cache, re);
event->response = FAN_ALLOW;
return 0;
}
list_add_tail(&re->list, &group->fanotify_data.access_list);
mutex_unlock(&group->fanotify_data.access_mutex);
@ -364,9 +372,28 @@ 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_response_event *re, *lre;
pr_debug("%s: file=%p group=%p\n", __func__, file, group);
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
mutex_lock(&group->fanotify_data.access_mutex);
group->fanotify_data.bypass_perm = true;
list_for_each_entry_safe(re, lre, &group->fanotify_data.access_list, list) {
pr_debug("%s: found group=%p re=%p event=%p\n", __func__, group,
re, re->event);
list_del_init(&re->list);
re->event->response = FAN_ALLOW;
kmem_cache_free(fanotify_response_event_cache, re);
}
mutex_unlock(&group->fanotify_data.access_mutex);
wake_up(&group->fanotify_data.access_waitq);
#endif
/* matches the fanotify_init->fsnotify_alloc_group */
fsnotify_put_group(group);
@ -614,7 +641,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
__func__, flags, event_f_flags);
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return -EPERM;
if (flags & ~FAN_ALL_INIT_FLAGS)
return -EINVAL;

68
fs/notify/fsnotify.c
View File

@ -148,13 +148,14 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
const unsigned char *file_name,
struct fsnotify_event **event)
{
struct fsnotify_group *group = inode_mark->group;
__u32 inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
__u32 vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
struct fsnotify_group *group = NULL;
__u32 inode_test_mask = 0;
__u32 vfsmount_test_mask = 0;
pr_debug("%s: group=%p to_tell=%p mnt=%p mark=%p mask=%x data=%p"
" data_is=%d cookie=%d event=%p\n", __func__, group, to_tell,
mnt, inode_mark, mask, data, data_is, cookie, *event);
if (unlikely(!inode_mark && !vfsmount_mark)) {
BUG();
return 0;
}
/* clear ignored on inode modification */
if (mask & FS_MODIFY) {
@ -168,18 +169,29 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
/* does the inode mark tell us to do something? */
if (inode_mark) {
group = inode_mark->group;
inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
inode_test_mask &= inode_mark->mask;
inode_test_mask &= ~inode_mark->ignored_mask;
}
/* does the vfsmount_mark tell us to do something? */
if (vfsmount_mark) {
vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
group = vfsmount_mark->group;
vfsmount_test_mask &= vfsmount_mark->mask;
vfsmount_test_mask &= ~vfsmount_mark->ignored_mask;
if (inode_mark)
vfsmount_test_mask &= ~inode_mark->ignored_mask;
}
pr_debug("%s: group=%p to_tell=%p mnt=%p mask=%x inode_mark=%p"
" inode_test_mask=%x vfsmount_mark=%p vfsmount_test_mask=%x"
" data=%p data_is=%d cookie=%d event=%p\n",
__func__, group, to_tell, mnt, mask, inode_mark,
inode_test_mask, vfsmount_mark, vfsmount_test_mask, data,
data_is, cookie, *event);
if (!inode_test_mask && !vfsmount_test_mask)
return 0;
@ -207,13 +219,12 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
const unsigned char *file_name, u32 cookie)
{
struct hlist_node *inode_node, *vfsmount_node;
struct hlist_node *inode_node = NULL, *vfsmount_node = NULL;
struct fsnotify_mark *inode_mark = NULL, *vfsmount_mark = NULL;
struct fsnotify_group *inode_group, *vfsmount_group;
struct fsnotify_event *event = NULL;
struct vfsmount *mnt;
int idx, ret = 0;
bool used_inode = false, used_vfsmount = false;
/* global tests shouldn't care about events on child only the specific event */
__u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
@ -238,57 +249,50 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
(test_mask & to_tell->i_fsnotify_mask))
inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
&fsnotify_mark_srcu);
else
inode_node = NULL;
if (mnt) {
if ((mask & FS_MODIFY) ||
(test_mask & mnt->mnt_fsnotify_mask))
vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
&fsnotify_mark_srcu);
else
vfsmount_node = NULL;
} else {
mnt = NULL;
vfsmount_node = NULL;
if (mnt && ((mask & FS_MODIFY) ||
(test_mask & mnt->mnt_fsnotify_mask))) {
vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
&fsnotify_mark_srcu);
inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
&fsnotify_mark_srcu);
}
while (inode_node || vfsmount_node) {
inode_group = vfsmount_group = NULL;
if (inode_node) {
inode_mark = hlist_entry(srcu_dereference(inode_node, &fsnotify_mark_srcu),
struct fsnotify_mark, i.i_list);
inode_group = inode_mark->group;
} else
inode_group = (void *)-1;
}
if (vfsmount_node) {
vfsmount_mark = hlist_entry(srcu_dereference(vfsmount_node, &fsnotify_mark_srcu),
struct fsnotify_mark, m.m_list);
vfsmount_group = vfsmount_mark->group;
} else
vfsmount_group = (void *)-1;
}
if (inode_group < vfsmount_group) {
if (inode_group > vfsmount_group) {
/* handle inode */
send_to_group(to_tell, NULL, inode_mark, NULL, mask, data,
data_is, cookie, file_name, &event);
used_inode = true;
} else if (vfsmount_group < inode_group) {
/* we didn't use the vfsmount_mark */
vfsmount_group = NULL;
} else if (vfsmount_group > inode_group) {
send_to_group(to_tell, mnt, NULL, vfsmount_mark, mask, data,
data_is, cookie, file_name, &event);
used_vfsmount = true;
inode_group = NULL;
} else {
send_to_group(to_tell, mnt, inode_mark, vfsmount_mark,
mask, data, data_is, cookie, file_name,
&event);
used_vfsmount = true;
used_inode = true;
}
if (used_inode)
if (inode_group)
inode_node = srcu_dereference(inode_node->next,
&fsnotify_mark_srcu);
if (used_vfsmount)
if (vfsmount_group)
vfsmount_node = srcu_dereference(vfsmount_node->next,
&fsnotify_mark_srcu);
}

13
include/linux/fanotify.h
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@ -65,14 +65,14 @@
FAN_ALL_PERM_EVENTS |\
FAN_Q_OVERFLOW)
#define FANOTIFY_METADATA_VERSION 1
#define FANOTIFY_METADATA_VERSION 2
struct fanotify_event_metadata {
__u32 event_len;
__u32 vers;
__s32 fd;
__u64 mask;
__s64 pid;
__s32 fd;
__s32 pid;
} __attribute__ ((packed));
struct fanotify_response {
@ -95,11 +95,4 @@ struct fanotify_response {
(long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
(long)(meta)->event_len <= (long)(len))
#ifdef __KERNEL__
struct fanotify_wait {
struct fsnotify_event *event;
__s32 fd;
};
#endif /* __KERNEL__ */
#endif /* _LINUX_FANOTIFY_H */

1
include/linux/fsnotify_backend.h
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@ -156,6 +156,7 @@ struct fsnotify_group {
struct mutex access_mutex;
struct list_head access_list;
wait_queue_head_t access_waitq;
bool bypass_perm; /* protected by access_mutex */
#endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
int f_flags;
} fanotify_data;