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procfs: don't allow to use proc_create, create_proc_entry, etc. for directories 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-03-30 21:20:14 -04:00
parent 21ba37c9cf
commit b6cdc73103
2 changed files with 27 additions and 34 deletions
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43
fs/proc/generic.c
View File

@ -541,19 +541,18 @@ static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp
return ret;
if (S_ISDIR(dp->mode)) {
if (dp->proc_iops == NULL) {
dp->proc_fops = &proc_dir_operations;
dp->proc_iops = &proc_dir_inode_operations;
}
dir->nlink++;
} else if (S_ISLNK(dp->mode)) {
if (dp->proc_iops == NULL)
dp->proc_iops = &proc_link_inode_operations;
} else if (S_ISREG(dp->mode)) {
if (dp->proc_fops == NULL)
dp->proc_fops = &proc_file_operations;
if (dp->proc_iops == NULL)
dp->proc_iops = &proc_file_inode_operations;
} else {
WARN_ON(1);
return -EINVAL;
}
spin_lock(&proc_subdir_lock);
@ -680,21 +679,19 @@ struct proc_dir_entry *create_proc_entry(const char *name, umode_t mode,
struct proc_dir_entry *parent)
{
struct proc_dir_entry *ent;
nlink_t nlink;
if (S_ISDIR(mode)) {
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO | S_IXUGO;
nlink = 2;
} else {
if ((mode & S_IFMT) == 0)
mode |= S_IFREG;
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO;
nlink = 1;
if (!S_ISREG(mode)) {
WARN_ON(1); /* use proc_mkdir(), damnit */
return NULL;
}
ent = __proc_create(&parent, name, mode, nlink);
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO;
ent = __proc_create(&parent, name, mode, 1);
if (ent) {
if (proc_register(parent, ent) < 0) {
kfree(ent);
@ -711,21 +708,17 @@ struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
void *data)
{
struct proc_dir_entry *pde;
nlink_t nlink;
if (S_ISDIR(mode)) {
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO | S_IXUGO;
nlink = 2;
} else {
if ((mode & S_IFMT) == 0)
mode |= S_IFREG;
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO;
nlink = 1;
if (!S_ISREG(mode)) {
WARN_ON(1); /* use proc_mkdir() */
return NULL;
}
pde = __proc_create(&parent, name, mode, nlink);
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO;
pde = __proc_create(&parent, name, mode, 1);
if (!pde)
goto out;
pde->proc_fops = proc_fops;

2
fs/proc/inode.c
View File

@ -462,7 +462,7 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
inode->i_size = de->size;
if (de->nlink)
set_nlink(inode, de->nlink);
if (de->proc_iops)
WARN_ON(!de->proc_iops);
inode->i_op = de->proc_iops;
if (de->proc_fops) {
if (S_ISREG(inode->i_mode)) {