Subject: [PATCH 2.6.32 08/12] udf: Check path length when reading symlink

From: Jan Kara <[email-masked]>
Date: Thu, 18 Dec 2014 22:37:50 +0100

commit 0e5cc9a40ada6046e6bc3bdfcd0c0d7e4b706b14 upstream.

Symlink reading code does not check whether the resulting path fits into
the page provided by the generic code. This isn't as easy as just
checking the symlink size because of various encoding conversions we
perform on path. So we have to check whether there is still enough space
in the buffer on the fly.

Reported-by: Carl Henrik Lunde <[email-masked]>
Signed-off-by: Jan Kara <[email-masked]>
[bwh: Backported to 2.6.32: adjust context, indentation]
Signed-off-by: Ben Hutchings <[email-masked]>
---
 fs/udf/dir.c     |  3 ++-
 fs/udf/namei.c   |  3 ++-
 fs/udf/symlink.c | 31 ++++++++++++++++++++++++++-----
 fs/udf/udfdecl.h |  3 ++-
 fs/udf/unicode.c | 28 ++++++++++++++++------------
 5 files changed, 48 insertions(+), 20 deletions(-)

diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index 61d9a76..1c551ea 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -164,7 +164,8 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
 			struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
 
 			iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
-			flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
+			flen = udf_get_filename(dir->i_sb, nameptr, lfi, fname,
+						UDF_NAME_LEN);
 			dt_type = DT_UNKNOWN;
 		}
 
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index b754151..0a6eb3f 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -237,7 +237,8 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 		if (!lfi)
 			continue;
 
-		flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
+		flen = udf_get_filename(dir->i_sb, nameptr, lfi, fname,
+					UDF_NAME_LEN);
 		if (flen && udf_match(flen, fname, child->len, child->name))
 			goto out_ok;
 	}
diff --git a/fs/udf/symlink.c b/fs/udf/symlink.c
index 2d60484..500c146 100644
--- a/fs/udf/symlink.c
+++ b/fs/udf/symlink.c
@@ -32,13 +32,16 @@
 #include <linux/buffer_head.h>
 #include "udf_i.h"
 
-static void udf_pc_to_char(struct super_block *sb, char *from, int fromlen,
-			   char *to)
+static int udf_pc_to_char(struct super_block *sb, char *from,
+			  int fromlen, char *to, int tolen)
 {
 	struct pathComponent *pc;
 	int elen = 0;
+	int comp_len;
 	char *p = to;
 
+	/* Reserve one byte for terminating \0 */
+	tolen--;
 	while (elen < fromlen) {
 		pc = (struct pathComponent *)(from + elen);
 		switch (pc->componentType) {
@@ -51,22 +54,37 @@ static void udf_pc_to_char(struct super_block *sb, char *from, int fromlen,
 				break;
 			/* Fall through */
 		case 2:
+			if (tolen == 0)
+				return -ENAMETOOLONG;
 			p = to;
 			*p++ = '/';
+			tolen--;
 			break;
 		case 3:
+			if (tolen < 3)
+				return -ENAMETOOLONG;
 			memcpy(p, "../", 3);
 			p += 3;
+			tolen -= 3;
 			break;
 		case 4:
+			if (tolen < 2)
+				return -ENAMETOOLONG;
 			memcpy(p, "./", 2);
 			p += 2;
+			tolen -= 2;
 			/* that would be . - just ignore */
 			break;
 		case 5:
-			p += udf_get_filename(sb, pc->componentIdent, p,
-					      pc->lengthComponentIdent);
+			comp_len = udf_get_filename(sb, pc->componentIdent,
+						    pc->lengthComponentIdent,
+						    p, tolen);
+			p += comp_len;
+			tolen -= comp_len;
+			if (tolen == 0)
+				return -ENAMETOOLONG;
 			*p++ = '/';
+			tolen--;
 			break;
 		}
 		elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
@@ -75,6 +93,7 @@ static void udf_pc_to_char(struct super_block *sb, char *from, int fromlen,
 		p[-1] = '\0';
 	else
 		p[0] = '\0';
+	return 0;
 }
 
 static int udf_symlink_filler(struct file *file, struct page *page)
@@ -107,8 +126,10 @@ static int udf_symlink_filler(struct file *file, struct page *page)
 		symlink = bh->b_data;
 	}
 
-	udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p);
+	err = udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p, PAGE_SIZE);
 	brelse(bh);
+	if (err)
+		goto out_unlock_inode;
 
 	unlock_kernel();
 	SetPageUptodate(page);
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 8d46f42..1b56330 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -200,7 +200,8 @@ udf_get_lb_pblock(struct super_block *sb, struct kernel_lb_addr *loc,
 }
 
 /* unicode.c */
-extern int udf_get_filename(struct super_block *, uint8_t *, uint8_t *, int);
+extern int udf_get_filename(struct super_block *, uint8_t *, int, uint8_t *,
+			    int);
 extern int udf_put_filename(struct super_block *, const uint8_t *, uint8_t *,
 			    int);
 extern int udf_build_ustr(struct ustr *, dstring *, int);
diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
index cefa8c8..c690157 100644
--- a/fs/udf/unicode.c
+++ b/fs/udf/unicode.c
@@ -27,7 +27,8 @@
 
 #include "udf_sb.h"
 
-static int udf_translate_to_linux(uint8_t *, uint8_t *, int, uint8_t *, int);
+static int udf_translate_to_linux(uint8_t *, int, uint8_t *, int, uint8_t *,
+				  int);
 
 static int udf_char_to_ustr(struct ustr *dest, const uint8_t *src, int strlen)
 {
@@ -332,8 +333,8 @@ try_again:
 	return u_len + 1;
 }
 
-int udf_get_filename(struct super_block *sb, uint8_t *sname, uint8_t *dname,
-		     int flen)
+int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,
+		     uint8_t *dname, int dlen)
 {
 	struct ustr *filename, *unifilename;
 	int len = 0;
@@ -346,7 +347,7 @@ int udf_get_filename(struct super_block *sb, uint8_t *sname, uint8_t *dname,
 	if (!unifilename)
 		goto out1;
 
-	if (udf_build_ustr_exact(unifilename, sname, flen))
+	if (udf_build_ustr_exact(unifilename, sname, slen))
 		goto out2;
 
 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
@@ -365,7 +366,8 @@ int udf_get_filename(struct super_block *sb, uint8_t *sname, uint8_t *dname,
 	} else
 		goto out2;
 
-	len = udf_translate_to_linux(dname, filename->u_name, filename->u_len,
+	len = udf_translate_to_linux(dname, dlen,
+				     filename->u_name, filename->u_len,
 				     unifilename->u_name, unifilename->u_len);
 out2:
 	kfree(unifilename);
@@ -402,10 +404,12 @@ int udf_put_filename(struct super_block *sb, const uint8_t *sname,
 #define EXT_MARK		'.'
 #define CRC_MARK		'#'
 #define EXT_SIZE 		5
+/* Number of chars we need to store generated CRC to make filename unique */
+#define CRC_LEN			5
 
-static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName,
-				  int udfLen, uint8_t *fidName,
-				  int fidNameLen)
+static int udf_translate_to_linux(uint8_t *newName, int newLen,
+				  uint8_t *udfName, int udfLen,
+				  uint8_t *fidName, int fidNameLen)
 {
 	int index, newIndex = 0, needsCRC = 0;
 	int extIndex = 0, newExtIndex = 0, hasExt = 0;
@@ -439,7 +443,7 @@ static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName,
 					newExtIndex = newIndex;
 				}
 			}
-			if (newIndex < 256)
+			if (newIndex < newLen)
 				newName[newIndex++] = curr;
 			else
 				needsCRC = 1;
@@ -467,13 +471,13 @@ static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName,
 				}
 				ext[localExtIndex++] = curr;
 			}
-			maxFilenameLen = 250 - localExtIndex;
+			maxFilenameLen = newLen - CRC_LEN - localExtIndex;
 			if (newIndex > maxFilenameLen)
 				newIndex = maxFilenameLen;
 			else
 				newIndex = newExtIndex;
-		} else if (newIndex > 250)
-			newIndex = 250;
+		} else if (newIndex > newLen - CRC_LEN)
+			newIndex = newLen - CRC_LEN;
 		newName[newIndex++] = CRC_MARK;
 		valueCRC = crc_itu_t(0, fidName, fidNameLen);
 		newName[newIndex++] = hexChar[(valueCRC & 0xf000) >> 12];