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Diffstat (limited to 'fs/proc/generic.c')
-rw-r--r--fs/proc/generic.c79
1 files changed, 53 insertions, 26 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index f2132407e133..501889856461 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -115,26 +115,25 @@ static bool pde_subdir_insert(struct proc_dir_entry *dir,
return true;
}
-static int proc_notify_change(struct user_namespace *mnt_userns,
+static int proc_notify_change(struct mnt_idmap *idmap,
struct dentry *dentry, struct iattr *iattr)
{
struct inode *inode = d_inode(dentry);
struct proc_dir_entry *de = PDE(inode);
int error;
- error = setattr_prepare(&init_user_ns, dentry, iattr);
+ error = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
if (error)
return error;
- setattr_copy(&init_user_ns, inode, iattr);
- mark_inode_dirty(inode);
+ setattr_copy(&nop_mnt_idmap, inode, iattr);
proc_set_user(de, inode->i_uid, inode->i_gid);
de->mode = inode->i_mode;
return 0;
}
-static int proc_getattr(struct user_namespace *mnt_userns,
+static int proc_getattr(struct mnt_idmap *idmap,
const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
@@ -147,7 +146,7 @@ static int proc_getattr(struct user_namespace *mnt_userns,
}
}
- generic_fillattr(&init_user_ns, inode, stat);
+ generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
return 0;
}
@@ -203,8 +202,8 @@ int proc_alloc_inum(unsigned int *inum)
{
int i;
- i = ida_simple_get(&proc_inum_ida, 0, UINT_MAX - PROC_DYNAMIC_FIRST + 1,
- GFP_KERNEL);
+ i = ida_alloc_max(&proc_inum_ida, UINT_MAX - PROC_DYNAMIC_FIRST,
+ GFP_KERNEL);
if (i < 0)
return i;
@@ -214,10 +213,11 @@ int proc_alloc_inum(unsigned int *inum)
void proc_free_inum(unsigned int inum)
{
- ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
+ ida_free(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
}
-static int proc_misc_d_revalidate(struct dentry *dentry, unsigned int flags)
+static int proc_misc_d_revalidate(struct inode *dir, const struct qstr *name,
+ struct dentry *dentry, unsigned int flags)
{
if (flags & LOOKUP_RCU)
return -ECHILD;
@@ -254,8 +254,11 @@ struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry,
inode = proc_get_inode(dir->i_sb, de);
if (!inode)
return ERR_PTR(-ENOMEM);
- d_set_d_op(dentry, de->proc_dops);
- return d_splice_alias(inode, dentry);
+ if (de->flags & PROC_ENTRY_FORCE_LOOKUP)
+ return d_splice_alias_ops(inode, dentry,
+ &proc_net_dentry_ops);
+ return d_splice_alias_ops(inode, dentry,
+ &proc_misc_dentry_ops);
}
read_unlock(&proc_subdir_lock);
return ERR_PTR(-ENOENT);
@@ -344,7 +347,8 @@ static const struct file_operations proc_dir_operations = {
.iterate_shared = proc_readdir,
};
-static int proc_net_d_revalidate(struct dentry *dentry, unsigned int flags)
+static int proc_net_d_revalidate(struct inode *dir, const struct qstr *name,
+ struct dentry *dentry, unsigned int flags)
{
return 0;
}
@@ -363,6 +367,25 @@ static const struct inode_operations proc_dir_inode_operations = {
.setattr = proc_notify_change,
};
+static void pde_set_flags(struct proc_dir_entry *pde)
+{
+ const struct proc_ops *proc_ops = pde->proc_ops;
+
+ if (!proc_ops)
+ return;
+
+ if (proc_ops->proc_flags & PROC_ENTRY_PERMANENT)
+ pde->flags |= PROC_ENTRY_PERMANENT;
+ if (proc_ops->proc_read_iter)
+ pde->flags |= PROC_ENTRY_proc_read_iter;
+#ifdef CONFIG_COMPAT
+ if (proc_ops->proc_compat_ioctl)
+ pde->flags |= PROC_ENTRY_proc_compat_ioctl;
+#endif
+ if (proc_ops->proc_lseek)
+ pde->flags |= PROC_ENTRY_proc_lseek;
+}
+
/* returns the registered entry, or frees dp and returns NULL on failure */
struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
struct proc_dir_entry *dp)
@@ -370,6 +393,9 @@ struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
if (proc_alloc_inum(&dp->low_ino))
goto out_free_entry;
+ if (!S_ISDIR(dp->mode))
+ pde_set_flags(dp);
+
write_lock(&proc_subdir_lock);
dp->parent = dir;
if (pde_subdir_insert(dir, dp) == false) {
@@ -447,7 +473,9 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
INIT_LIST_HEAD(&ent->pde_openers);
proc_set_user(ent, (*parent)->uid, (*parent)->gid);
- ent->proc_dops = &proc_misc_dentry_ops;
+ /* Revalidate everything under /proc/${pid}/net */
+ if ((*parent)->flags & PROC_ENTRY_FORCE_LOOKUP)
+ pde_force_lookup(ent);
out:
return ent;
@@ -462,9 +490,9 @@ struct proc_dir_entry *proc_symlink(const char *name,
(S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1);
if (ent) {
- ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL);
+ ent->size = strlen(dest);
+ ent->data = kmemdup(dest, ent->size + 1, GFP_KERNEL);
if (ent->data) {
- strcpy((char*)ent->data,dest);
ent->proc_iops = &proc_link_inode_operations;
ent = proc_register(parent, ent);
} else {
@@ -555,12 +583,6 @@ struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
return p;
}
-static inline void pde_set_flags(struct proc_dir_entry *pde)
-{
- if (pde->proc_ops->proc_flags & PROC_ENTRY_PERMANENT)
- pde->flags |= PROC_ENTRY_PERMANENT;
-}
-
struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
struct proc_dir_entry *parent,
const struct proc_ops *proc_ops, void *data)
@@ -571,7 +593,6 @@ struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
if (!p)
return NULL;
p->proc_ops = proc_ops;
- pde_set_flags(p);
return proc_register(parent, p);
}
EXPORT_SYMBOL(proc_create_data);
@@ -677,6 +698,12 @@ void pde_put(struct proc_dir_entry *pde)
}
}
+static void pde_erase(struct proc_dir_entry *pde, struct proc_dir_entry *parent)
+{
+ rb_erase(&pde->subdir_node, &parent->subdir);
+ RB_CLEAR_NODE(&pde->subdir_node);
+}
+
/*
* Remove a /proc entry and free it if it's not currently in use.
*/
@@ -699,7 +726,7 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
WARN(1, "removing permanent /proc entry '%s'", de->name);
de = NULL;
} else {
- rb_erase(&de->subdir_node, &parent->subdir);
+ pde_erase(de, parent);
if (S_ISDIR(de->mode))
parent->nlink--;
}
@@ -743,7 +770,7 @@ int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
root->parent->name, root->name);
return -EINVAL;
}
- rb_erase(&root->subdir_node, &parent->subdir);
+ pde_erase(root, parent);
de = root;
while (1) {
@@ -755,7 +782,7 @@ int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
next->parent->name, next->name);
return -EINVAL;
}
- rb_erase(&next->subdir_node, &de->subdir);
+ pde_erase(next, de);
de = next;
continue;
}
generated by cgit (git 2.34.1) at 2025-12-21 21:02:39 +0000