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tpm: fix alignment issues 

The new tpm-crb-test fails on sparc host:

TEST: tests/tpm-crb-test... (pid=230409)
  /i386/tpm-crb/test:
Broken pipe
FAIL
GTester: last random seed: R02S29cea50247fe1efa59ee885a26d51a85
(pid=230423)
FAIL: tests/tpm-crb-test

and generates a new clang sanitizer runtime warning:

/home/petmay01/linaro/qemu-for-merges/hw/tpm/tpm_util.h:36:24: runtime
error: load of misaligned address 0x7fdc24c00002 for type 'const
uint32_t' (aka 'const unsigned int'), which requires 4 byte alignment
0x7fdc24c00002: note: pointer points here
<memory cannot be printed>

The sparc architecture does not allow misaligned loads and will
segfault if you try them.  For example, this function:

static inline uint32_t tpm_cmd_get_size(const void *b)
{
    return be32_to_cpu(*(const uint32_t *)(b + 2));
}

Should read,
    return ldl_be_p(b + 2);

As a general rule you can't take an arbitrary pointer into a byte
buffer and try to interpret it as a structure or a pointer to a
larger-than-bytesize-data simply by casting the pointer.

Use this clean up as an opportunity to remove unnecessary temporary
buffers and casts.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
This commit is contained in:
Marc-André Lureau 2018-01-29 19:33:03 +01:00 committed by Stefan Berger
parent 3027058764
commit cc1b6c5533
4 changed files with 58 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
hw/tpm/tpm_emulator.c
View File

@ -120,7 +120,6 @@ static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,
{
ssize_t ret;
bool is_selftest = false;
const struct tpm_resp_hdr *hdr = NULL;
if (selftest_done) {
*selftest_done = false;
@ -132,22 +131,21 @@ static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,
return -1;
}
ret = qio_channel_read_all(tpm_emu->data_ioc, (char *)out, sizeof(*hdr),
err);
ret = qio_channel_read_all(tpm_emu->data_ioc, (char *)out,
sizeof(struct tpm_resp_hdr), err);
if (ret != 0) {
return -1;
}
hdr = (struct tpm_resp_hdr *)out;
out += sizeof(*hdr);
ret = qio_channel_read_all(tpm_emu->data_ioc, (char *)out,
be32_to_cpu(hdr->len) - sizeof(*hdr) , err);
ret = qio_channel_read_all(tpm_emu->data_ioc,
(char *)out + sizeof(struct tpm_resp_hdr),
tpm_cmd_get_size(out) - sizeof(struct tpm_resp_hdr), err);
if (ret != 0) {
return -1;
}
if (is_selftest) {
*selftest_done = (be32_to_cpu(hdr->errcode) == 0);
*selftest_done = tpm_cmd_get_errcode(out) == 0;
}
return 0;

6
hw/tpm/tpm_passthrough.c
View File

@ -87,7 +87,6 @@ static int tpm_passthrough_unix_tx_bufs(TPMPassthruState *tpm_pt,
{
ssize_t ret;
bool is_selftest;
const struct tpm_resp_hdr *hdr;
/* FIXME: protect shared variables or use other sync mechanism */
tpm_pt->tpm_op_canceled = false;
@ -116,15 +115,14 @@ static int tpm_passthrough_unix_tx_bufs(TPMPassthruState *tpm_pt,
strerror(errno), errno);
}
} else if (ret < sizeof(struct tpm_resp_hdr) ||
be32_to_cpu(((struct tpm_resp_hdr *)out)->len) != ret) {
tpm_cmd_get_size(out) != ret) {
ret = -1;
error_report("tpm_passthrough: received invalid response "
"packet from TPM");
}
if (is_selftest && (ret >= sizeof(struct tpm_resp_hdr))) {
hdr = (struct tpm_resp_hdr *)out;
*selftest_done = (be32_to_cpu(hdr->errcode) == 0);
*selftest_done = tpm_cmd_get_errcode(out) == 0;
}
err_exit:

75
hw/tpm/tpm_util.c
View File

@ -106,20 +106,16 @@ const PropertyInfo qdev_prop_tpm = {
void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len)
{
if (out_len >= sizeof(struct tpm_resp_hdr)) {
struct tpm_resp_hdr *resp = (struct tpm_resp_hdr *)out;
resp->tag = cpu_to_be16(TPM_TAG_RSP_COMMAND);
resp->len = cpu_to_be32(sizeof(struct tpm_resp_hdr));
resp->errcode = cpu_to_be32(TPM_FAIL);
stw_be_p(out, TPM_TAG_RSP_COMMAND);
stl_be_p(out + 2, sizeof(struct tpm_resp_hdr));
stl_be_p(out + 6, TPM_FAIL);
}
}
bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len)
{
struct tpm_req_hdr *hdr = (struct tpm_req_hdr *)in;
if (in_len >= sizeof(*hdr)) {
return (be32_to_cpu(hdr->ordinal) == TPM_ORD_ContinueSelfTest);
if (in_len >= sizeof(struct tpm_req_hdr)) {
return tpm_cmd_get_ordinal(in) == TPM_ORD_ContinueSelfTest;
}
return false;
@ -129,12 +125,11 @@ bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len)
* Send request to a TPM device. We expect a response within one second.
*/
static int tpm_util_request(int fd,
unsigned char *request,
const void *request,
size_t requestlen,
unsigned char *response,
void *response,
size_t responselen)
{
struct tpm_resp_hdr *resp;
fd_set readfds;
int n;
struct timeval tv = {
@ -164,9 +159,8 @@ static int tpm_util_request(int fd,
return -EFAULT;
}
resp = (struct tpm_resp_hdr *)response;
/* check the header */
if (be32_to_cpu(resp->len) != n) {
if (tpm_cmd_get_size(response) != n) {
return -EMSGSIZE;
}
@ -178,12 +172,11 @@ static int tpm_util_request(int fd,
* (error response is fine).
*/
static int tpm_util_test(int fd,
unsigned char *request,
const void *request,
size_t requestlen,
uint16_t *return_tag)
{
struct tpm_resp_hdr *resp;
unsigned char buf[1024];
char buf[1024];
ssize_t ret;
ret = tpm_util_request(fd, request, requestlen,
@ -192,8 +185,7 @@ static int tpm_util_test(int fd,
return ret;
}
resp = (struct tpm_resp_hdr *)buf;
*return_tag = be16_to_cpu(resp->tag);
*return_tag = tpm_cmd_get_tag(buf);
return 0;
}
@ -228,7 +220,7 @@ int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version)
int ret;
/* Send TPM 2 command */
ret = tpm_util_test(tpm_fd, (unsigned char *)&test_req_tpm2,
ret = tpm_util_test(tpm_fd, &test_req_tpm2,
sizeof(test_req_tpm2), &return_tag);
/* TPM 2 would respond with a tag of TPM2_ST_NO_SESSIONS */
if (!ret && return_tag == TPM2_ST_NO_SESSIONS) {
@ -237,7 +229,7 @@ int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version)
}
/* Send TPM 1.2 command */
ret = tpm_util_test(tpm_fd, (unsigned char *)&test_req,
ret = tpm_util_test(tpm_fd, &test_req,
sizeof(test_req), &return_tag);
if (!ret && return_tag == TPM_TAG_RSP_COMMAND) {
*tpm_version = TPM_VERSION_1_2;
@ -253,7 +245,6 @@ int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version)
int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
size_t *buffersize)
{
unsigned char buf[1024];
int ret;
switch (tpm_version) {
@ -277,26 +268,27 @@ int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
struct tpm_resp_hdr hdr;
uint32_t len;
uint32_t buffersize;
} QEMU_PACKED *tpm_resp = (struct tpm_resp_get_buffer_size *)buf;
} QEMU_PACKED tpm_resp;
ret = tpm_util_request(tpm_fd, (unsigned char *)&tpm_get_buffer_size,
sizeof(tpm_get_buffer_size), buf, sizeof(buf));
ret = tpm_util_request(tpm_fd, &tpm_get_buffer_size,
sizeof(tpm_get_buffer_size),
&tpm_resp, sizeof(tpm_resp));
if (ret < 0) {
return ret;
}
if (be32_to_cpu(tpm_resp->hdr.len) != sizeof(*tpm_resp) ||
be32_to_cpu(tpm_resp->len) != sizeof(uint32_t)) {
if (be32_to_cpu(tpm_resp.hdr.len) != sizeof(tpm_resp) ||
be32_to_cpu(tpm_resp.len) != sizeof(uint32_t)) {
DPRINTF("tpm_resp->hdr.len = %u, expected = %zu\n",
be32_to_cpu(tpm_resp->hdr.len), sizeof(*tpm_resp));
be32_to_cpu(tpm_resp.hdr.len), sizeof(tpm_resp));
DPRINTF("tpm_resp->len = %u, expected = %zu\n",
be32_to_cpu(tpm_resp->len), sizeof(uint32_t));
be32_to_cpu(tpm_resp.len), sizeof(uint32_t));
error_report("tpm_util: Got unexpected response to "
"TPM_GetCapability; errcode: 0x%x",
be32_to_cpu(tpm_resp->hdr.errcode));
be32_to_cpu(tpm_resp.hdr.errcode));
return -EFAULT;
}
*buffersize = be32_to_cpu(tpm_resp->buffersize);
*buffersize = be32_to_cpu(tpm_resp.buffersize);
break;
}
case TPM_VERSION_2_0: {
@ -324,27 +316,28 @@ int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
uint32_t value1;
uint32_t property2;
uint32_t value2;
} QEMU_PACKED *tpm2_resp = (struct tpm2_resp_get_buffer_size *)buf;
} QEMU_PACKED tpm2_resp;
ret = tpm_util_request(tpm_fd, (unsigned char *)&tpm2_get_buffer_size,
sizeof(tpm2_get_buffer_size), buf, sizeof(buf));
ret = tpm_util_request(tpm_fd, &tpm2_get_buffer_size,
sizeof(tpm2_get_buffer_size),
&tpm2_resp, sizeof(tpm2_resp));
if (ret < 0) {
return ret;
}
if (be32_to_cpu(tpm2_resp->hdr.len) != sizeof(*tpm2_resp) ||
be32_to_cpu(tpm2_resp->count) != 2) {
if (be32_to_cpu(tpm2_resp.hdr.len) != sizeof(tpm2_resp) ||
be32_to_cpu(tpm2_resp.count) != 2) {
DPRINTF("tpm2_resp->hdr.len = %u, expected = %zu\n",
be32_to_cpu(tpm2_resp->hdr.len), sizeof(*tpm2_resp));
be32_to_cpu(tpm2_resp.hdr.len), sizeof(tpm2_resp));
DPRINTF("tpm2_resp->len = %u, expected = %u\n",
be32_to_cpu(tpm2_resp->count), 2);
be32_to_cpu(tpm2_resp.count), 2);
error_report("tpm_util: Got unexpected response to "
"TPM2_GetCapability; errcode: 0x%x",
be32_to_cpu(tpm2_resp->hdr.errcode));
be32_to_cpu(tpm2_resp.hdr.errcode));
return -EFAULT;
}
*buffersize = MAX(be32_to_cpu(tpm2_resp->value1),
be32_to_cpu(tpm2_resp->value2));
*buffersize = MAX(be32_to_cpu(tpm2_resp.value1),
be32_to_cpu(tpm2_resp.value2));
break;
}
case TPM_VERSION_UNSPEC:

17
hw/tpm/tpm_util.h
View File

@ -31,9 +31,24 @@ bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len);
int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version);
static inline uint16_t tpm_cmd_get_tag(const void *b)
{
return lduw_be_p(b);
}
static inline uint32_t tpm_cmd_get_size(const void *b)
{
return be32_to_cpu(*(const uint32_t *)(b + 2));
return ldl_be_p(b + 2);
}
static inline uint32_t tpm_cmd_get_ordinal(const void *b)
{
return ldl_be_p(b + 6);
}
static inline uint32_t tpm_cmd_get_errcode(const void *b)
{
return ldl_be_p(b + 6);
}
int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,