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Don't allow chmod() on the /proc/<pid>/ files

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This just turns off chmod() on the /proc/<pid>/ files, since there is no
good reason to allow it, and had we disallowed it originally, the nasty
/proc race exploit wouldn't have been possible.

The other patches already fixed the problem chmod() could cause, so this
is really just some final mop-up..

This particular version is based off a patch by Eugene and Marcel which
had much better naming than my original equivalent one.

Signed-off-by: Eugene Teo <eteo@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2006-07-15 12:26:45 -07:00
parent 92d032855e
commit 6d76fa58b0
1 changed files with 30 additions and 1 deletions
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31
fs/proc/base.c
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@ -551,6 +551,27 @@ static int proc_fd_access_allowed(struct inode *inode)
return allowed;
}
static int proc_setattr(struct dentry *dentry, struct iattr *attr)
{
int error;
struct inode *inode = dentry->d_inode;
if (attr->ia_valid & ATTR_MODE)
return -EPERM;
error = inode_change_ok(inode, attr);
if (!error) {
error = security_inode_setattr(dentry, attr);
if (!error)
error = inode_setattr(inode, attr);
}
return error;
}
static struct inode_operations proc_def_inode_operations = {
.setattr = proc_setattr,
};
extern struct seq_operations mounts_op;
struct proc_mounts {
struct seq_file m;
@ -1111,7 +1132,8 @@ out:
static struct inode_operations proc_pid_link_inode_operations = {
.readlink = proc_pid_readlink,
.follow_link = proc_pid_follow_link
.follow_link = proc_pid_follow_link,
.setattr = proc_setattr,
};
static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
@ -1285,6 +1307,7 @@ static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_st
ei = PROC_I(inode);
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_ino = fake_ino(task->pid, ino);
inode->i_op = &proc_def_inode_operations;
/*
* grab the reference to task.
@ -1529,11 +1552,13 @@ static struct file_operations proc_task_operations = {
*/
static struct inode_operations proc_fd_inode_operations = {
.lookup = proc_lookupfd,
.setattr = proc_setattr,
};
static struct inode_operations proc_task_inode_operations = {
.lookup = proc_task_lookup,
.getattr = proc_task_getattr,
.setattr = proc_setattr,
};
#ifdef CONFIG_SECURITY
@ -1847,11 +1872,13 @@ static struct file_operations proc_tid_base_operations = {
static struct inode_operations proc_tgid_base_inode_operations = {
.lookup = proc_tgid_base_lookup,
.getattr = pid_getattr,
.setattr = proc_setattr,
};
static struct inode_operations proc_tid_base_inode_operations = {
.lookup = proc_tid_base_lookup,
.getattr = pid_getattr,
.setattr = proc_setattr,
};
#ifdef CONFIG_SECURITY
@ -1894,11 +1921,13 @@ static struct dentry *proc_tid_attr_lookup(struct inode *dir,
static struct inode_operations proc_tgid_attr_inode_operations = {
.lookup = proc_tgid_attr_lookup,
.getattr = pid_getattr,
.setattr = proc_setattr,
};
static struct inode_operations proc_tid_attr_inode_operations = {
.lookup = proc_tid_attr_lookup,
.getattr = pid_getattr,
.setattr = proc_setattr,
};
#endif