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hc
2024-05-10 cde9070d9970eef1f7ec2360586c802a16230ad8 
 kernel/security/tomoyo/realpath.c
....@@ -7,6 +7,7 @@
77 
88 #include "common.h"
99 #include <linux/magic.h>
10
+#include <linux/proc_fs.h>
1011 
1112 /**
1213  * tomoyo_encode2 - Encode binary string to ascii string.
....@@ -94,11 +95,13 @@
9495 				      const int buflen)
9596 {
9697 	char *pos = ERR_PTR(-ENOMEM);
98
+
9799 	if (buflen >= 256) {
98100 		/* go to whatever namespace root we are under */
99101 		pos = d_absolute_path(path, buffer, buflen - 1);
100102 		if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
101103 			struct inode *inode = d_backing_inode(path->dentry);
104
+
102105 			if (inode && S_ISDIR(inode->i_mode)) {
103106 				buffer[buflen - 2] = '/';
104107 				buffer[buflen - 1] = '\0';
....@@ -123,10 +126,12 @@
123126 				    const int buflen)
124127 {
125128 	char *pos = ERR_PTR(-ENOMEM);
129
+
126130 	if (buflen >= 256) {
127131 		pos = dentry_path_raw(dentry, buffer, buflen - 1);
128132 		if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
129133 			struct inode *inode = d_backing_inode(dentry);
134
+
130135 			if (inode && S_ISDIR(inode->i_mode)) {
131136 				buffer[buflen - 2] = '/';
132137 				buffer[buflen - 1] = '\0';
....@@ -150,14 +155,17 @@
150155 {
151156 	struct super_block *sb = dentry->d_sb;
152157 	char *pos = tomoyo_get_dentry_path(dentry, buffer, buflen);
158
+
153159 	if (IS_ERR(pos))
154160 		return pos;
155161 	/* Convert from $PID to self if $PID is current thread. */
156162 	if (sb->s_magic == PROC_SUPER_MAGIC && *pos == '/') {
157163 		char *ep;
158164 		const pid_t pid = (pid_t) simple_strtoul(pos + 1, &ep, 10);
165
+		struct pid_namespace *proc_pidns = proc_pid_ns(sb);
166
+
159167 		if (*ep == '/' && pid && pid ==
160
-		    task_tgid_nr_ns(current, sb->s_fs_info)) {
168
+		    task_tgid_nr_ns(current, proc_pidns)) {
161169 			pos = ep - 5;
162170 			if (pos < buffer)
163171 				goto out;
....@@ -170,6 +178,7 @@
170178 		goto prepend_filesystem_name;
171179 	{
172180 		struct inode *inode = d_backing_inode(sb->s_root);
181
+
173182 		/*
174183 		 * Use filesystem name if filesystem does not support rename()
175184 		 * operation.
....@@ -182,6 +191,7 @@
182191 		char name[64];
183192 		int name_len;
184193 		const dev_t dev = sb->s_dev;
194
+
185195 		name[sizeof(name) - 1] = '\0';
186196 		snprintf(name, sizeof(name) - 1, "dev(%u,%u):", MAJOR(dev),
187197 			 MINOR(dev));
....@@ -197,6 +207,7 @@
197207 	{
198208 		const char *name = sb->s_type->name;
199209 		const int name_len = strlen(name);
210
+
200211 		pos -= name_len + 1;
201212 		if (pos < buffer)
202213 			goto out;
....@@ -206,31 +217,6 @@
206217 	return pos;
207218 out:
208219 	return ERR_PTR(-ENOMEM);
209
-}
210
-
211
-/**
212
- * tomoyo_get_socket_name - Get the name of a socket.
213
- *
214
- * @path:   Pointer to "struct path".
215
- * @buffer: Pointer to buffer to return value in.
216
- * @buflen: Sizeof @buffer.
217
- *
218
- * Returns the buffer.
219
- */
220
-static char *tomoyo_get_socket_name(const struct path *path, char * const buffer,
221
-				    const int buflen)
222
-{
223
-	struct inode *inode = d_backing_inode(path->dentry);
224
-	struct socket *sock = inode ? SOCKET_I(inode) : NULL;
225
-	struct sock *sk = sock ? sock->sk : NULL;
226
-	if (sk) {
227
-		snprintf(buffer, buflen, "socket:[family=%u:type=%u:"
228
-			 "protocol=%u]", sk->sk_family, sk->sk_type,
229
-			 sk->sk_protocol);
230
-	} else {
231
-		snprintf(buffer, buflen, "socket:[unknown]");
232
-	}
233
-	return buffer;
234220 }
235221 
236222 /**
....@@ -255,12 +241,14 @@
255241 	unsigned int buf_len = PAGE_SIZE / 2;
256242 	struct dentry *dentry = path->dentry;
257243 	struct super_block *sb;
244
+
258245 	if (!dentry)
259246 		return NULL;
260247 	sb = dentry->d_sb;
261248 	while (1) {
262249 		char *pos;
263250 		struct inode *inode;
251
+
264252 		buf_len <<= 1;
265253 		kfree(buf);
266254 		buf = kmalloc(buf_len, GFP_NOFS);
....@@ -268,12 +256,7 @@
268256 			break;
269257 		/* To make sure that pos is '\0' terminated. */
270258 		buf[buf_len - 1] = '\0';
271
-		/* Get better name for socket. */
272
-		if (sb->s_magic == SOCKFS_MAGIC) {
273
-			pos = tomoyo_get_socket_name(path, buf, buf_len - 1);
274
-			goto encode;
275
-		}
276
-		/* For "pipe:[\$]". */
259
+		/* For "pipe:[\$]" and "socket:[\$]". */
277260 		if (dentry->d_op && dentry->d_op->d_dname) {
278261 			pos = dentry->d_op->d_dname(dentry, buf, buf_len - 1);
279262 			goto encode;
....@@ -284,7 +267,8 @@
284267 		 * or dentry without vfsmount.
285268 		 */
286269 		if (!path->mnt ||
287
-		    (!inode->i_op->rename))
270
+		    (!inode->i_op->rename &&
271
+		     !(sb->s_type->fs_flags & FS_REQUIRES_DEV)))
288272 			pos = tomoyo_get_local_path(path->dentry, buf,
289273 						    buf_len - 1);
290274 		/* Get absolute name for the rest. */
....@@ -323,6 +307,7 @@
323307 
324308 	if (pathname && kern_path(pathname, 0, &path) == 0) {
325309 		char *buf = tomoyo_realpath_from_path(&path);
310
+
326311 		path_put(&path);
327312 		return buf;
328313 	}