diff options
Diffstat (limited to 'fs/proc/base.c')
-rw-r--r-- | fs/proc/base.c | 132 |
1 files changed, 88 insertions, 44 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index c59852b..88f8edf 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -121,6 +121,10 @@ struct pid_entry { NOD(NAME, (S_IFREG|(MODE)), \ NULL, &proc_info_file_operations, \ { .proc_read = &proc_##OTYPE } ) +#define ONE(NAME, MODE, OTYPE) \ + NOD(NAME, (S_IFREG|(MODE)), \ + NULL, &proc_single_file_operations, \ + { .proc_show = &proc_##OTYPE } ) int maps_protect; EXPORT_SYMBOL(maps_protect); @@ -149,7 +153,7 @@ static int get_nr_threads(struct task_struct *tsk) return count; } -static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) +static int proc_cwd_link(struct inode *inode, struct path *path) { struct task_struct *task = get_proc_task(inode); struct fs_struct *fs = NULL; @@ -161,8 +165,8 @@ static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfs } if (fs) { read_lock(&fs->lock); - *mnt = mntget(fs->pwdmnt); - *dentry = dget(fs->pwd); + *path = fs->pwd; + path_get(&fs->pwd); read_unlock(&fs->lock); result = 0; put_fs_struct(fs); @@ -170,7 +174,7 @@ static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfs return result; } -static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) +static int proc_root_link(struct inode *inode, struct path *path) { struct task_struct *task = get_proc_task(inode); struct fs_struct *fs = NULL; @@ -182,8 +186,8 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf } if (fs) { read_lock(&fs->lock); - *mnt = mntget(fs->rootmnt); - *dentry = dget(fs->root); + *path = fs->root; + path_get(&fs->root); read_unlock(&fs->lock); result = 0; put_fs_struct(fs); @@ -502,7 +506,7 @@ static const struct inode_operations proc_def_inode_operations = { .setattr = proc_setattr, }; -extern struct seq_operations mounts_op; +extern const struct seq_operations mounts_op; struct proc_mounts { struct seq_file m; int event; @@ -581,7 +585,7 @@ static const struct file_operations proc_mounts_operations = { .poll = mounts_poll, }; -extern struct seq_operations mountstats_op; +extern const struct seq_operations mountstats_op; static int mountstats_open(struct inode *inode, struct file *file) { int ret = seq_open(file, &mountstats_op); @@ -658,6 +662,45 @@ static const struct file_operations proc_info_file_operations = { .read = proc_info_read, }; +static int proc_single_show(struct seq_file *m, void *v) +{ + struct inode *inode = m->private; + struct pid_namespace *ns; + struct pid *pid; + struct task_struct *task; + int ret; + + ns = inode->i_sb->s_fs_info; + pid = proc_pid(inode); + task = get_pid_task(pid, PIDTYPE_PID); + if (!task) + return -ESRCH; + + ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); + + put_task_struct(task); + return ret; +} + +static int proc_single_open(struct inode *inode, struct file *filp) +{ + int ret; + ret = single_open(filp, proc_single_show, NULL); + if (!ret) { + struct seq_file *m = filp->private_data; + + m->private = inode; + } + return ret; +} + +static const struct file_operations proc_single_file_operations = { + .open = proc_single_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + static int mem_open(struct inode* inode, struct file* file) { file->private_data = (void*)((long)current->self_exec_id); @@ -1121,39 +1164,36 @@ static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) int error = -EACCES; /* We don't need a base pointer in the /proc filesystem */ - path_release(nd); + path_put(&nd->path); /* Are we allowed to snoop on the tasks file descriptors? */ if (!proc_fd_access_allowed(inode)) goto out; - error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); + error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); nd->last_type = LAST_BIND; out: return ERR_PTR(error); } -static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, - char __user *buffer, int buflen) +static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) { - struct inode * inode; char *tmp = (char*)__get_free_page(GFP_TEMPORARY); - char *path; + char *pathname; int len; if (!tmp) return -ENOMEM; - inode = dentry->d_inode; - path = d_path(dentry, mnt, tmp, PAGE_SIZE); - len = PTR_ERR(path); - if (IS_ERR(path)) + pathname = d_path(path, tmp, PAGE_SIZE); + len = PTR_ERR(pathname); + if (IS_ERR(pathname)) goto out; - len = tmp + PAGE_SIZE - 1 - path; + len = tmp + PAGE_SIZE - 1 - pathname; if (len > buflen) len = buflen; - if (copy_to_user(buffer, path, len)) + if (copy_to_user(buffer, pathname, len)) len = -EFAULT; out: free_page((unsigned long)tmp); @@ -1164,20 +1204,18 @@ static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int b { int error = -EACCES; struct inode *inode = dentry->d_inode; - struct dentry *de; - struct vfsmount *mnt = NULL; + struct path path; /* Are we allowed to snoop on the tasks file descriptors? */ if (!proc_fd_access_allowed(inode)) goto out; - error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); + error = PROC_I(inode)->op.proc_get_link(inode, &path); if (error) goto out; - error = do_proc_readlink(de, mnt, buffer, buflen); - dput(de); - mntput(mnt); + error = do_proc_readlink(&path, buffer, buflen); + path_put(&path); out: return error; } @@ -1404,8 +1442,7 @@ out: #define PROC_FDINFO_MAX 64 -static int proc_fd_info(struct inode *inode, struct dentry **dentry, - struct vfsmount **mnt, char *info) +static int proc_fd_info(struct inode *inode, struct path *path, char *info) { struct task_struct *task = get_proc_task(inode); struct files_struct *files = NULL; @@ -1424,10 +1461,10 @@ static int proc_fd_info(struct inode *inode, struct dentry **dentry, spin_lock(&files->file_lock); file = fcheck_files(files, fd); if (file) { - if (mnt) - *mnt = mntget(file->f_path.mnt); - if (dentry) - *dentry = dget(file->f_path.dentry); + if (path) { + *path = file->f_path; + path_get(&file->f_path); + } if (info) snprintf(info, PROC_FDINFO_MAX, "pos:\t%lli\n" @@ -1444,10 +1481,9 @@ static int proc_fd_info(struct inode *inode, struct dentry **dentry, return -ENOENT; } -static int proc_fd_link(struct inode *inode, struct dentry **dentry, - struct vfsmount **mnt) +static int proc_fd_link(struct inode *inode, struct path *path) { - return proc_fd_info(inode, dentry, mnt, NULL); + return proc_fd_info(inode, path, NULL); } static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) @@ -1641,7 +1677,7 @@ static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) { char tmp[PROC_FDINFO_MAX]; - int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, NULL, tmp); + int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); if (!err) err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); return err; @@ -2058,15 +2094,23 @@ static const struct file_operations proc_coredump_filter_operations = { static int proc_self_readlink(struct dentry *dentry, char __user *buffer, int buflen) { + struct pid_namespace *ns = dentry->d_sb->s_fs_info; + pid_t tgid = task_tgid_nr_ns(current, ns); char tmp[PROC_NUMBUF]; - sprintf(tmp, "%d", task_tgid_vnr(current)); + if (!tgid) + return -ENOENT; + sprintf(tmp, "%d", tgid); return vfs_readlink(dentry,buffer,buflen,tmp); } static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) { + struct pid_namespace *ns = dentry->d_sb->s_fs_info; + pid_t tgid = task_tgid_nr_ns(current, ns); char tmp[PROC_NUMBUF]; - sprintf(tmp, "%d", task_tgid_vnr(current)); + if (!tgid) + return ERR_PTR(-ENOENT); + sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); return ERR_PTR(vfs_follow_link(nd,tmp)); } @@ -2231,14 +2275,14 @@ static const struct pid_entry tgid_base_stuff[] = { DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), REG("environ", S_IRUSR, environ), INF("auxv", S_IRUSR, pid_auxv), - INF("status", S_IRUGO, pid_status), + ONE("status", S_IRUGO, pid_status), INF("limits", S_IRUSR, pid_limits), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, pid_sched), #endif INF("cmdline", S_IRUGO, pid_cmdline), - INF("stat", S_IRUGO, tgid_stat), - INF("statm", S_IRUGO, pid_statm), + ONE("stat", S_IRUGO, tgid_stat), + ONE("statm", S_IRUGO, pid_statm), REG("maps", S_IRUGO, maps), #ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, numa_maps), @@ -2562,14 +2606,14 @@ static const struct pid_entry tid_base_stuff[] = { DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), REG("environ", S_IRUSR, environ), INF("auxv", S_IRUSR, pid_auxv), - INF("status", S_IRUGO, pid_status), + ONE("status", S_IRUGO, pid_status), INF("limits", S_IRUSR, pid_limits), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, pid_sched), #endif INF("cmdline", S_IRUGO, pid_cmdline), - INF("stat", S_IRUGO, tid_stat), - INF("statm", S_IRUGO, pid_statm), + ONE("stat", S_IRUGO, tid_stat), + ONE("statm", S_IRUGO, pid_statm), REG("maps", S_IRUGO, maps), #ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, numa_maps), |