Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/nsproxy.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/ipc_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/pid_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/user_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) static const struct proc_ns_operations *ns_entries[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #ifdef CONFIG_NET_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	&netns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #ifdef CONFIG_UTS_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	&utsns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #ifdef CONFIG_IPC_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	&ipcns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #ifdef CONFIG_PID_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	&pidns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	&pidns_for_children_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #ifdef CONFIG_USER_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	&userns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	&mntns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #ifdef CONFIG_CGROUPS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	&cgroupns_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #ifdef CONFIG_TIME_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	&timens_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	&timens_for_children_operations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static const char *proc_ns_get_link(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 				    struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 				    struct delayed_call *done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct task_struct *task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct path ns_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	int error = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if (!dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		return ERR_PTR(-ECHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	task = get_proc_task(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (!task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		return ERR_PTR(-EACCES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	error = ns_get_path(&ns_path, task, ns_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	error = nd_jump_link(&ns_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int buflen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct task_struct *task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	char name[50];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	int res = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	task = get_proc_task(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (!task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		res = ns_get_name(name, sizeof(name), task, ns_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		if (res >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			res = readlink_copy(buffer, buflen, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static const struct inode_operations proc_ns_link_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	.readlink	= proc_ns_readlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	.get_link	= proc_ns_get_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	.setattr	= proc_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static struct dentry *proc_ns_instantiate(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct task_struct *task, const void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	const struct proc_ns_operations *ns_ops = ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct proc_inode *ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK | S_IRWXUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	ei = PROC_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	inode->i_op = &proc_ns_link_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	ei->ns_ops = ns_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	pid_update_inode(task, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	d_set_d_op(dentry, &pid_dentry_operations);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static int proc_ns_dir_readdir(struct file *file, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	struct task_struct *task = get_proc_task(file_inode(file));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	const struct proc_ns_operations **entry, **last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (!task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (!dir_emit_dots(file, ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (ctx->pos >= 2 + ARRAY_SIZE(ns_entries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	entry = ns_entries + (ctx->pos - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	while (entry <= last) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		const struct proc_ns_operations *ops = *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		if (!proc_fill_cache(file, ctx, ops->name, strlen(ops->name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 				     proc_ns_instantiate, task, ops))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		ctx->pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		entry++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) const struct file_operations proc_ns_dir_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	.read		= generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	.iterate_shared	= proc_ns_dir_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	.llseek		= generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static struct dentry *proc_ns_dir_lookup(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 				struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	struct task_struct *task = get_proc_task(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	const struct proc_ns_operations **entry, **last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	unsigned int len = dentry->d_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct dentry *res = ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if (!task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		goto out_no_task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	last = &ns_entries[ARRAY_SIZE(ns_entries)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	for (entry = ns_entries; entry < last; entry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		if (strlen((*entry)->name) != len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		if (!memcmp(dentry->d_name.name, (*entry)->name, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (entry == last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	res = proc_ns_instantiate(dentry, task, *entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) out_no_task:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) const struct inode_operations proc_ns_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	.lookup		= proc_ns_dir_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	.getattr	= pid_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	.setattr	= proc_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) };