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Fix access to unaligned hidden TrueCrypt header.

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On native 4k-sector device the old hidden header is not aligned
with hw sector size and derect-io access with SEEK_END fails.

Let's extend blockwise functions to support a negative offset
and use the same logic as normal unaligned writes.

Fixes problem mentioned in
https://gitlab.com/cryptsetup/cryptsetup/merge_requests/18
This commit is contained in:
Milan Broz
2017-03-27 12:04:31 +02:00
parent fc42f878e9
commit eb59311136
2 changed files with 22 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
lib/tcrypt/tcrypt.c
View File

@@ -635,27 +635,26 @@ int TCRYPT_read_phdr(struct crypt_device *cd,
r = -EIO;
if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) {
if (lseek(devfd, TCRYPT_HDR_SYSTEM_OFFSET, SEEK_SET) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size) {
if (read_lseek_blockwise(devfd, bs, hdr, hdr_size,
TCRYPT_HDR_SYSTEM_OFFSET) == hdr_size) {
r = TCRYPT_init_hdr(cd, hdr, params);
}
} else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
if (lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET_BCK, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
if (read_lseek_blockwise(devfd, bs, hdr, hdr_size,
TCRYPT_HDR_HIDDEN_OFFSET_BCK) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
} else {
if (lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET, SEEK_SET) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
if (read_lseek_blockwise(devfd, bs, hdr, hdr_size,
TCRYPT_HDR_HIDDEN_OFFSET) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
if (r &&
lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET_OLD, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
if (r && read_lseek_blockwise(devfd, bs, hdr, hdr_size,
TCRYPT_HDR_HIDDEN_OFFSET_OLD) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
}
} else if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
if (lseek(devfd, TCRYPT_HDR_OFFSET_BCK, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
if (read_lseek_blockwise(devfd, bs, hdr, hdr_size,
TCRYPT_HDR_OFFSET_BCK) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
} else if (read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);