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libext2fs: verify and calculate extended attribute block checksums 

Calculate and verify the checksum for separate (i.e. not in the inode)
extended attribute blocks; the checksum lives in the header.

[ Merged in change from Tao so that we always use the fs checksum seed
  for the xattr blocks. ]

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
pu
Darrick J. Wong 2012-08-02 20:47:44 -04:00 committed by Theodore Ts'o
parent 761b76a4c7
commit 39f5659ae3
9 changed files with 134 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
e2fsck/pass1.c
View File

@ -1518,7 +1518,8 @@ static void adjust_extattr_refcount(e2fsck_t ctx, ext2_refcount_t refcount,
if ((blk = ea_refcount_intr_next(refcount, &count)) == 0)
break;
pctx.blk = blk;
pctx.errcode = ext2fs_read_ext_attr2(fs, blk, block_buf);
pctx.errcode = ext2fs_read_ext_attr3(fs, blk, block_buf,
pctx.ino);
if (pctx.errcode) {
fix_problem(ctx, PR_1_EXTATTR_READ_ABORT, &pctx);
return;
@ -1529,8 +1530,9 @@ static void adjust_extattr_refcount(e2fsck_t ctx, ext2_refcount_t refcount,
pctx.num = should_be;
if (fix_problem(ctx, PR_1_EXTATTR_REFCOUNT, &pctx)) {
header->h_refcount = should_be;
pctx.errcode = ext2fs_write_ext_attr2(fs, blk,
block_buf);
pctx.errcode = ext2fs_write_ext_attr3(fs, blk,
block_buf,
pctx.ino);
if (pctx.errcode) {
fix_problem(ctx, PR_1_EXTATTR_WRITE_ABORT,
&pctx);
@ -1628,7 +1630,7 @@ static int check_ext_attr(e2fsck_t ctx, struct problem_context *pctx,
* validate it
*/
pctx->blk = blk;
pctx->errcode = ext2fs_read_ext_attr2(fs, blk, block_buf);
pctx->errcode = ext2fs_read_ext_attr3(fs, blk, block_buf, pctx->ino);
if (pctx->errcode && fix_problem(ctx, PR_1_READ_EA_BLOCK, pctx))
goto clear_extattr;
header = (struct ext2_ext_attr_header *) block_buf;

4
e2fsck/pass1b.c
View File

@ -653,9 +653,9 @@ static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
if (ext2fs_file_acl_block(fs, &inode) &&
(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
count = 1;
pctx.errcode = ext2fs_adjust_ea_refcount2(fs,
pctx.errcode = ext2fs_adjust_ea_refcount3(fs,
ext2fs_file_acl_block(fs, &inode),
block_buf, -1, &count);
block_buf, -1, &count, ino);
if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
pctx.errcode = 0;
count = 1;

6
e2fsck/pass2.c
View File

@ -1290,9 +1290,9 @@ static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
if (ext2fs_file_acl_block(fs, &inode) &&
(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
pctx.errcode = ext2fs_adjust_ea_refcount2(fs,
ext2fs_file_acl_block(fs, &inode),
block_buf, -1, &count);
pctx.errcode = ext2fs_adjust_ea_refcount3(fs,
ext2fs_file_acl_block(fs, &inode),
block_buf, -1, &count, ino);
if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
pctx.errcode = 0;
count = 1;

6
e2fsck/super.c
View File

@ -199,9 +199,9 @@ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks);
if (ext2fs_file_acl_block(fs, inode)) {
retval = ext2fs_adjust_ea_refcount2(fs,
ext2fs_file_acl_block(fs, inode),
block_buf, -1, &count);
retval = ext2fs_adjust_ea_refcount3(fs,
ext2fs_file_acl_block(fs, inode),
block_buf, -1, &count, ino);
if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
retval = 0;
count = 1;

56
lib/ext2fs/csum.c
View File

@ -30,6 +30,62 @@
#define STATIC static
#endif
static errcode_t ext2fs_ext_attr_block_csum(ext2_filsys fs, ext2_ino_t inum,
blk64_t block,
struct ext2_ext_attr_header *hdr,
__u32 *crc)
{
errcode_t retval;
char *buf = (char *)hdr;
__u32 gen, old_crc = hdr->h_checksum;
struct ext2_inode inode;
hdr->h_checksum = 0;
block = ext2fs_cpu_to_le64(block);
*crc = ext2fs_crc32c_le(fs->csum_seed, (unsigned char *)&block,
sizeof(block));
*crc = ext2fs_crc32c_le(*crc, (unsigned char *)buf, fs->blocksize);
hdr->h_checksum = old_crc;
return 0;
}
int ext2fs_ext_attr_block_csum_verify(ext2_filsys fs, ext2_ino_t inum,
blk64_t block,
struct ext2_ext_attr_header *hdr)
{
__u32 calculated;
errcode_t retval;
if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
return 1;
retval = ext2fs_ext_attr_block_csum(fs, inum, block, hdr, &calculated);
if (retval)
return 0;
return ext2fs_le32_to_cpu(hdr->h_checksum) == calculated;
}
errcode_t ext2fs_ext_attr_block_csum_set(ext2_filsys fs, ext2_ino_t inum,
blk64_t block,
struct ext2_ext_attr_header *hdr)
{
errcode_t retval;
__u32 crc;
if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
return 0;
retval = ext2fs_ext_attr_block_csum(fs, inum, block, hdr, &crc);
if (retval)
return retval;
hdr->h_checksum = ext2fs_cpu_to_le32(crc);
return 0;
}
static __u16 do_nothing16(__u16 x)
{
return x;

3
lib/ext2fs/ext2_err.et.in
View File

@ -461,4 +461,7 @@ ec EXT2_ET_DIR_NO_SPACE_FOR_CSUM,
ec EXT2_ET_DIR_CSUM_INVALID,
"Directory block checksum does not match directory block"
ec EXT2_ET_EXT_ATTR_CSUM_INVALID,
"Extended attribute block checksum does not match block"
end

14
lib/ext2fs/ext2fs.h
View File

@ -943,6 +943,12 @@ extern __u32 ext2fs_crc32c_be(__u32 crc, unsigned char const *p, size_t len);
extern __u32 ext2fs_crc32c_le(__u32 crc, unsigned char const *p, size_t len);
/* csum.c */
extern errcode_t ext2fs_ext_attr_block_csum_set(ext2_filsys fs,
ext2_ino_t inum, blk64_t block,
struct ext2_ext_attr_header *hdr);
extern int ext2fs_ext_attr_block_csum_verify(ext2_filsys fs, ext2_ino_t inum,
blk64_t block,
struct ext2_ext_attr_header *hdr);
#define EXT2_DIRENT_TAIL(block, blocksize) \
((struct ext2_dir_entry_tail *)(((void *)(block)) + \
(blocksize) - sizeof(struct ext2_dir_entry_tail)))
@ -1097,16 +1103,24 @@ extern __u32 ext2fs_ext_attr_hash_entry(struct ext2_ext_attr_entry *entry,
extern errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf);
extern errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block,
void *buf);
extern errcode_t ext2fs_read_ext_attr3(ext2_filsys fs, blk64_t block,
void *buf, ext2_ino_t inum);
extern errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block,
void *buf);
extern errcode_t ext2fs_write_ext_attr2(ext2_filsys fs, blk64_t block,
void *buf);
extern errcode_t ext2fs_write_ext_attr3(ext2_filsys fs, blk64_t block,
void *buf, ext2_ino_t inum);
extern errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
char *block_buf,
int adjust, __u32 *newcount);
extern errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
char *block_buf,
int adjust, __u32 *newcount);
extern errcode_t ext2fs_adjust_ea_refcount3(ext2_filsys fs, blk64_t blk,
char *block_buf,
int adjust, __u32 *newcount,
ext2_ino_t inum);
/* extent.c */
extern errcode_t ext2fs_extent_header_verify(void *ptr, int size);

59
lib/ext2fs/ext_attr.c
View File

@ -61,17 +61,29 @@ __u32 ext2fs_ext_attr_hash_entry(struct ext2_ext_attr_entry *entry, void *data)
#undef NAME_HASH_SHIFT
#undef VALUE_HASH_SHIFT
errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block, void *buf)
errcode_t ext2fs_read_ext_attr3(ext2_filsys fs, blk64_t block, void *buf,
ext2_ino_t inum)
{
errcode_t retval;
retval = io_channel_read_blk64(fs->io, block, 1, buf);
if (retval)
return retval;
if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
!ext2fs_ext_attr_block_csum_verify(fs, inum, block, buf))
retval = EXT2_ET_EXT_ATTR_CSUM_INVALID;
#ifdef WORDS_BIGENDIAN
ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
#endif
return 0;
return retval;
}
errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block, void *buf)
{
return ext2fs_read_ext_attr3(fs, block, buf, 0);
}
errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
@ -79,30 +91,40 @@ errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
return ext2fs_read_ext_attr2(fs, block, buf);
}
errcode_t ext2fs_write_ext_attr2(ext2_filsys fs, blk64_t block, void *inbuf)
errcode_t ext2fs_write_ext_attr3(ext2_filsys fs, blk64_t block, void *inbuf,
ext2_ino_t inum)
{
errcode_t retval;
char *write_buf;
#ifdef WORDS_BIGENDIAN
char *buf = NULL;
retval = ext2fs_get_mem(fs->blocksize, &buf);
#ifdef WORDS_BIGENDIAN
retval = ext2fs_get_mem(fs->blocksize, &write_buf);
if (retval)
return retval;
write_buf = buf;
ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1);
ext2fs_swap_ext_attr(write_buf, inbuf, fs->blocksize, 1);
#else
write_buf = (char *) inbuf;
#endif
retval = ext2fs_ext_attr_block_csum_set(fs, inum, block,
(struct ext2_ext_attr_header *)write_buf);
if (retval)
return retval;
retval = io_channel_write_blk64(fs->io, block, 1, write_buf);
#ifdef WORDS_BIGENDIAN
ext2fs_free_mem(&buf);
ext2fs_free_mem(&write_buf);
#endif
if (!retval)
ext2fs_mark_changed(fs);
return retval;
}
errcode_t ext2fs_write_ext_attr2(ext2_filsys fs, blk64_t block, void *inbuf)
{
return ext2fs_write_ext_attr3(fs, block, inbuf, 0);
}
errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
{
return ext2fs_write_ext_attr2(fs, block, inbuf);
@ -111,9 +133,9 @@ errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
/*
* This function adjusts the reference count of the EA block.
*/
errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
errcode_t ext2fs_adjust_ea_refcount3(ext2_filsys fs, blk64_t blk,
char *block_buf, int adjust,
__u32 *newcount)
__u32 *newcount, ext2_ino_t inum)
{
errcode_t retval;
struct ext2_ext_attr_header *header;
@ -130,7 +152,7 @@ errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
block_buf = buf;
}
retval = ext2fs_read_ext_attr2(fs, blk, block_buf);
retval = ext2fs_read_ext_attr3(fs, blk, block_buf, inum);
if (retval)
goto errout;
@ -139,7 +161,7 @@ errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
if (newcount)
*newcount = header->h_refcount;
retval = ext2fs_write_ext_attr2(fs, blk, block_buf);
retval = ext2fs_write_ext_attr3(fs, blk, block_buf, inum);
if (retval)
goto errout;
@ -149,9 +171,18 @@ errout:
return retval;
}
errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
char *block_buf, int adjust,
__u32 *newcount)
{
return ext2fs_adjust_ea_refcount3(fs, blk, block_buf, adjust,
newcount, 0);
}
errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
char *block_buf, int adjust,
__u32 *newcount)
{
return ext2fs_adjust_ea_refcount(fs, blk, block_buf, adjust, newcount);
return ext2fs_adjust_ea_refcount2(fs, blk, block_buf, adjust,
newcount);
}

3
lib/ext2fs/swapfs.c
View File

@ -157,7 +157,8 @@ void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header,
to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
to_header->h_hash = ext2fs_swab32(from_header->h_hash);
for (n = 0; n < 4; n++)
to_header->h_checksum = ext2fs_swab32(from_header->h_checksum);
for (n = 0; n < 3; n++)
to_header->h_reserved[n] =
ext2fs_swab32(from_header->h_reserved[n]);
}