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Differential D23259 Diff 67027 sys/fs/ext2fs/ext2_csum.c

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sys/fs/ext2fs/ext2_csum.c

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ext2_dirent_get_tail(struct inode *ip, struct ext2fs_direct_2 *ep) ext2_dirent_get_tail(struct inode *ip, struct ext2fs_direct_2 *ep)
{ {
struct ext2fs_direct_2 *dep; struct ext2fs_direct_2 *dep;
void *top; void *top;
unsigned int rec_len; unsigned int rec_len;
dep = ep; dep = ep;
top = EXT2_DIRENT_TAIL(ep, ip->i_e2fs->e2fs_bsize); top = EXT2_DIRENT_TAIL(ep, ip->i_e2fs->e2fs_bsize);
rec_len = dep->e2d_reclen; rec_len = le16toh(dep->e2d_reclen);
while (rec_len && !(rec_len & 0x3)) { while (rec_len && !(rec_len & 0x3)) {
dep = (struct ext2fs_direct_2 *)(((char *)dep) + rec_len); dep = (struct ext2fs_direct_2 *)(((char *)dep) + rec_len);
if ((void *)dep >= top) if ((void *)dep >= top)
break; break;
rec_len = dep->e2d_reclen; rec_len = le16toh(dep->e2d_reclen);
} }
if (dep != top) if (dep != top)
return (NULL); return (NULL);
if (ext2_is_dirent_tail(ip, dep)) if (ext2_is_dirent_tail(ip, dep))
return ((struct ext2fs_direct_tail *)dep); return ((struct ext2fs_direct_tail *)dep);
Show All 39 Lines
static struct ext2fs_htree_count * static struct ext2fs_htree_count *
ext2_get_dx_count(struct inode *ip, struct ext2fs_direct_2 *ep, int *offset) ext2_get_dx_count(struct inode *ip, struct ext2fs_direct_2 *ep, int *offset)
{ {
struct ext2fs_direct_2 *dp; struct ext2fs_direct_2 *dp;
struct ext2fs_htree_root_info *root; struct ext2fs_htree_root_info *root;
int count_offset; int count_offset;
if (ep->e2d_reclen == EXT2_BLOCK_SIZE(ip->i_e2fs)) if (le16toh(ep->e2d_reclen) == EXT2_BLOCK_SIZE(ip->i_e2fs))
count_offset = 8; count_offset = 8;
else if (ep->e2d_reclen == 12) { else if (ep->e2d_reclen == 12) {
dp = (struct ext2fs_direct_2 *)(((char *)ep) + 12); dp = (struct ext2fs_direct_2 *)(((char *)ep) + 12);
if (dp->e2d_reclen != EXT2_BLOCK_SIZE(ip->i_e2fs) - 12) if (le16toh(dp->e2d_reclen) != EXT2_BLOCK_SIZE(ip->i_e2fs) - 12)
return (NULL); return (NULL);
root = (struct ext2fs_htree_root_info *)(((char *)dp + 12)); root = (struct ext2fs_htree_root_info *)(((char *)dp + 12));
if (root->h_reserved1 || if (root->h_reserved1 ||
root->h_info_len != sizeof(struct ext2fs_htree_root_info)) root->h_info_len != sizeof(struct ext2fs_htree_root_info))
return (NULL); return (NULL);
count_offset = 32; count_offset = 32;
▲ Show 20 Lines • Show All 306 Lines • ▼ Show 20 Lines crc = calculate_crc32c(crc, (uint8_t *)ei + offset,
E2FS_REV0_INODE_SIZE - offset); E2FS_REV0_INODE_SIZE - offset);
if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) { if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) {
offset = offsetof(struct ext2fs_dinode, e2di_chksum_hi); offset = offsetof(struct ext2fs_dinode, e2di_chksum_hi);
crc = calculate_crc32c(crc, (uint8_t *)ei + crc = calculate_crc32c(crc, (uint8_t *)ei +
E2FS_REV0_INODE_SIZE, offset - E2FS_REV0_INODE_SIZE); E2FS_REV0_INODE_SIZE, offset - E2FS_REV0_INODE_SIZE);
if ((EXT2_INODE_SIZE(ip->i_e2fs) > E2FS_REV0_INODE_SIZE && if ((EXT2_INODE_SIZE(ip->i_e2fs) > E2FS_REV0_INODE_SIZE &&
ei->e2di_extra_isize >= EXT2_INODE_CSUM_HI_EXTRA_END)) { le16toh(ei->e2di_extra_isize) >= EXT2_INODE_CSUM_HI_EXTRA_END)) {
crc = calculate_crc32c(crc, (uint8_t *)&dummy_csum, crc = calculate_crc32c(crc, (uint8_t *)&dummy_csum,
csum_size); csum_size);
offset += csum_size; offset += csum_size;
} }
crc = calculate_crc32c(crc, (uint8_t *)ei + offset, crc = calculate_crc32c(crc, (uint8_t *)ei + offset,
EXT2_INODE_SIZE(fs) - offset); EXT2_INODE_SIZE(fs) - offset);
} }
return (crc); return (crc);
} }
int int
ext2_ei_csum_verify(struct inode *ip, struct ext2fs_dinode *ei) ext2_ei_csum_verify(struct inode *ip, struct ext2fs_dinode *ei)
{ {
struct m_ext2fs *fs; struct m_ext2fs *fs;
const static struct ext2fs_dinode ei_zero; const static struct ext2fs_dinode ei_zero;
uint32_t hi, provided, calculated; uint32_t hi, provided, calculated;
fs = ip->i_e2fs; fs = ip->i_e2fs;
if (!EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) if (!EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
return (0); return (0);
provided = ei->e2di_chksum_lo; provided = le16toh(ei->e2di_chksum_lo);
calculated = ext2_ei_csum(ip, ei); calculated = ext2_ei_csum(ip, ei);
if ((EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE && if ((EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE &&
ei->e2di_extra_isize >= EXT2_INODE_CSUM_HI_EXTRA_END)) { le16toh(ei->e2di_extra_isize) >= EXT2_INODE_CSUM_HI_EXTRA_END)) {
hi = ei->e2di_chksum_hi; hi = le16toh(ei->e2di_chksum_hi);
provided |= hi << 16; provided |= hi << 16;
} else } else
calculated &= 0xFFFF; calculated &= 0xFFFF;
if (provided != calculated) { if (provided != calculated) {
/* /*
* If it is first time used dinode, * If it is first time used dinode,
* it is expected that it will be zeroed * it is expected that it will be zeroed
Show All 18 Linesext2_ei_csum_set(struct inode *ip, struct ext2fs_dinode *ei)
fs = ip->i_e2fs; fs = ip->i_e2fs;
if (!EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) if (!EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
return; return;
crc = ext2_ei_csum(ip, ei); crc = ext2_ei_csum(ip, ei);
ei->e2di_chksum_lo = crc & 0xFFFF; ei->e2di_chksum_lo = htole16(crc & 0xFFFF);
if ((EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE && if ((EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE &&
ei->e2di_extra_isize >= EXT2_INODE_CSUM_HI_EXTRA_END)) le16toh(ei->e2di_extra_isize) >= EXT2_INODE_CSUM_HI_EXTRA_END))
ei->e2di_chksum_hi = crc >> 16; ei->e2di_chksum_hi = htole16(crc >> 16);
} }
static uint16_t static uint16_t
ext2_crc16(uint16_t crc, const void *buffer, unsigned int len) ext2_crc16(uint16_t crc, const void *buffer, unsigned int len)
{ {
const unsigned char *cp = buffer; const unsigned char *cp = buffer;
/* CRC table for the CRC-16. The poly is 0x8005 (x16 + x15 + x2 + 1). */ /* CRC table for the CRC-16. The poly is 0x8005 (x16 + x15 + x2 + 1). */
static uint16_t const crc16_table[256] = { static uint16_t const crc16_table[256] = {
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