diff options
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 243a94af0427..fe8d55fb17cc 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -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. @@ -1339,6 +1362,7 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) inode->i_uid = 0; inode->i_gid = 0; } + inode->i_mode &= ~(S_ISUID | S_ISGID); security_task_to_inode(task, inode); put_task_struct(task); return 1; @@ -1389,6 +1413,7 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) inode->i_uid = 0; inode->i_gid = 0; } + inode->i_mode &= ~(S_ISUID | S_ISGID); security_task_to_inode(task, inode); put_task_struct(task); return 1; @@ -1527,11 +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 @@ -1845,11 +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 @@ -1892,11 +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 |