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Use crypt_wipe to zero rest of data device.

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This commit is contained in:
Ondrej Kozina
2024-05-06 11:20:13 +02:00
committed by Milan Broz
parent 738b9ee645
commit 42a073c0cb
1 changed files with 15 additions and 40 deletions
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55
src/utils_reencrypt_luks1.c
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@@ -843,52 +843,20 @@ out:
return quit ? -EAGAIN : r;
}
static void zero_rest_of_device(int fd, size_t block_size, void *buf,
uint64_t *bytes, uint64_t offset)
static int detect_interrupt(uint64_t size __attribute__((unused)),
uint64_t offset __attribute__((unused)),
void *usrptr __attribute__((unused)))
{
ssize_t s1, s2;
int r = 0;
assert(bytes);
check_signal(&r);
if (*bytes > SSIZE_MAX || !block_size || block_size > SSIZE_MAX)
return;
log_dbg("Zeroing rest of device.");
if (lseek(fd, offset, SEEK_SET) < 0) {
log_dbg("Cannot seek to device offset.");
return;
}
memset(buf, 0, block_size);
s1 = block_size;
while (!quit && *bytes) {
if (*bytes < (uint64_t)s1)
s1 = (ssize_t)*bytes;
/*
* FIXME: this may fail with shorter write.
* Replace ir with write_buffer from lib/utils_io.c
*/
s2 = write(fd, buf, s1);
if (s2 < 0 || s2 != s1) {
log_dbg("Write error, expecting %zd, got %zd.",
s1, s2);
return;
}
if (ARG_SET(OPT_USE_FSYNC_ID) && fsync(fd) < 0) {
log_dbg("Write error, fsync.");
return;
}
*bytes -= (uint64_t)s2;
}
return r;
}
static int copy_data(struct reenc_ctx *rc)
{
struct crypt_device *wipe_cd;
size_t block_size = ARG_UINT32(OPT_BLOCK_SIZE_ID) * 1024 * 1024;
int fd_old = -1, fd_new = -1;
int r = -EINVAL;
@@ -944,7 +912,14 @@ static int copy_data(struct reenc_ctx *rc)
if (!r && rc->reencrypt_mode == DECRYPT &&
rc->device_size_new_real > rc->device_size_org_real) {
bytes = rc->device_size_new_real - rc->device_size_org_real;
zero_rest_of_device(fd_new, block_size, buf, &bytes, rc->device_size_org_real);
if (crypt_init(&wipe_cd, rc->crypt_path_new) == 0) {
log_dbg("Zeroing rest of device.");
(void)crypt_wipe(wipe_cd, NULL, CRYPT_WIPE_ZERO,
rc->device_size_org_real, bytes, block_size,
!ARG_SET(OPT_USE_DIRECTIO_ID) ? CRYPT_WIPE_NO_DIRECT_IO : 0,
detect_interrupt, NULL);
crypt_free(wipe_cd);
}
}
set_int_block(1);