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udf: Check path length when reading symlink

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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.

CC: stable@vger.kernel.org
Reported-by: Carl Henrik Lunde <chlunde@ping.uio.no>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2014-12-18 22:37:50 +01:00
parent a1d47b2629
commit 0e5cc9a40a
5 changed files with 48 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/udf/dir.c
View File

@ -167,7 +167,8 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
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)
continue;

3
fs/udf/namei.c
View File

@ -233,7 +233,8 @@ 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;
}

31
fs/udf/symlink.c
View File

@ -30,13 +30,16 @@
#include <linux/buffer_head.h>
#include "udf_i.h"
static void udf_pc_to_char(struct super_block *sb, unsigned char *from,
int fromlen, unsigned char *to)
static int udf_pc_to_char(struct super_block *sb, unsigned char *from,
int fromlen, unsigned char *to, int tolen)
{
struct pathComponent *pc;
int elen = 0;
int comp_len;
unsigned char *p = to;
/* Reserve one byte for terminating \0 */
tolen--;
while (elen < fromlen) {
pc = (struct pathComponent *)(from + elen);
switch (pc->componentType) {
@ -49,22 +52,37 @@ static void udf_pc_to_char(struct super_block *sb, unsigned char *from,
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;
@ -73,6 +91,7 @@ static void udf_pc_to_char(struct super_block *sb, unsigned char *from,
p[-1] = '\0';
else
p[0] = '\0';
return 0;
}
static int udf_symlink_filler(struct file *file, struct page *page)
@ -108,8 +127,10 @@ 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;
up_read(&iinfo->i_data_sem);
SetPageUptodate(page);

3
fs/udf/udfdecl.h
View File

@ -211,7 +211,8 @@ 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);

28
fs/udf/unicode.c
View File

@ -28,7 +28,8 @@
#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)
{
@ -333,8 +334,8 @@ 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;
@ -347,7 +348,7 @@ 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)) {
@ -366,7 +367,8 @@ 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);
@ -403,10 +405,12 @@ 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++] = hex_asc_upper_hi(valueCRC >> 8);