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proc: Pass file mode to proc_pid_make_inode 

Pass the file mode of the proc inode to be created to
proc_pid_make_inode.  In proc_pid_make_inode, initialize inode->i_mode
before calling security_task_to_inode.  This allows selinux to set
isec->sclass right away without introducing "half-initialized" inode
security structs.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Andreas Gruenbacher 2016-11-10 22:18:28 +01:00 committed by Paul Moore
parent 420591128c
commit db978da8fa
5 changed files with 14 additions and 21 deletions
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23
fs/proc/base.c
View File

@ -1663,7 +1663,8 @@ const struct inode_operations proc_pid_link_inode_operations = {
/* building an inode */
struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
struct inode *proc_pid_make_inode(struct super_block * sb,
struct task_struct *task, umode_t mode)
{
struct inode * inode;
struct proc_inode *ei;
@ -1677,6 +1678,7 @@ struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *t
/* Common stuff */
ei = PROC_I(inode);
inode->i_mode = mode;
inode->i_ino = get_next_ino();
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
inode->i_op = &proc_def_inode_operations;
@ -2003,7 +2005,9 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK |
((mode & FMODE_READ ) ? S_IRUSR : 0) |
((mode & FMODE_WRITE) ? S_IWUSR : 0));
if (!inode)
return -ENOENT;
@ -2012,12 +2016,6 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
inode->i_op = &proc_map_files_link_inode_operations;
inode->i_size = 64;
inode->i_mode = S_IFLNK;
if (mode & FMODE_READ)
inode->i_mode |= S_IRUSR;
if (mode & FMODE_WRITE)
inode->i_mode |= S_IWUSR;
d_set_d_op(dentry, &tid_map_files_dentry_operations);
d_add(dentry, inode);
@ -2371,12 +2369,11 @@ static int proc_pident_instantiate(struct inode *dir,
struct inode *inode;
struct proc_inode *ei;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, p->mode);
if (!inode)
goto out;
ei = PROC_I(inode);
inode->i_mode = p->mode;
if (S_ISDIR(inode->i_mode))
set_nlink(inode, 2); /* Use getattr to fix if necessary */
if (p->iop)
@ -3058,11 +3055,10 @@ static int proc_pid_instantiate(struct inode *dir,
{
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO);
if (!inode)
goto out;
inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
inode->i_op = &proc_tgid_base_inode_operations;
inode->i_fop = &proc_tgid_base_operations;
inode->i_flags|=S_IMMUTABLE;
@ -3351,11 +3347,10 @@ static int proc_task_instantiate(struct inode *dir,
struct dentry *dentry, struct task_struct *task, const void *ptr)
{
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO);
if (!inode)
goto out;
inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
inode->i_op = &proc_tid_base_inode_operations;
inode->i_fop = &proc_tid_base_operations;
inode->i_flags|=S_IMMUTABLE;

6
fs/proc/fd.c
View File

@ -183,14 +183,13 @@ proc_fd_instantiate(struct inode *dir, struct dentry *dentry,
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK);
if (!inode)
goto out;
ei = PROC_I(inode);
ei->fd = fd;
inode->i_mode = S_IFLNK;
inode->i_op = &proc_pid_link_inode_operations;
inode->i_size = 64;
@ -322,14 +321,13 @@ proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry,
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, S_IFREG | S_IRUSR);
if (!inode)
goto out;
ei = PROC_I(inode);
ei->fd = fd;
inode->i_mode = S_IFREG | S_IRUSR;
inode->i_fop = &proc_fdinfo_file_operations;
d_set_d_op(dentry, &tid_fd_dentry_operations);

2
fs/proc/internal.h
View File

@ -162,7 +162,7 @@ extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
extern const struct dentry_operations pid_dentry_operations;
extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int proc_setattr(struct dentry *, struct iattr *);
extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *);
extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
extern int pid_revalidate(struct dentry *, unsigned int);
extern int pid_delete_dentry(const struct dentry *);
extern int proc_pid_readdir(struct file *, struct dir_context *);

3
fs/proc/namespaces.c
View File

@ -92,12 +92,11 @@ static int proc_ns_instantiate(struct inode *dir,
struct inode *inode;
struct proc_inode *ei;
inode = proc_pid_make_inode(dir->i_sb, task);
inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK | S_IRWXUGO);
if (!inode)
goto out;
ei = PROC_I(inode);
inode->i_mode = S_IFLNK|S_IRWXUGO;
inode->i_op = &proc_ns_link_inode_operations;
ei->ns_ops = ns_ops;

1
security/selinux/hooks.c
View File

@ -3955,6 +3955,7 @@ static void selinux_task_to_inode(struct task_struct *p,
struct inode_security_struct *isec = inode->i_security;
u32 sid = task_sid(p);
isec->sclass = inode_mode_to_security_class(inode->i_mode);
isec->sid = sid;
isec->initialized = LABEL_INITIALIZED;
}