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trace: ensure correct grouping

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It is important that output to the trace channels occurs only inside
a trace group. This precondtion is satisfied whenever the standard
TRACE macros are used. It can be violated only by a bad programming
mistake, like copying the 'trc_out' pointer and using it outside
the trace group.

This commit enforces correct pairing of the OSSL_TRACE_CTRL_BEGIN and
OSSL_TRACE_CTRL_END callbacks, and checks that OSSL_TRACE_CTRL_WRITE
callbacks only occur within such groups.

While implementing it, it turned out that the group assertion failed

  apps/openssl.c:152: OpenSSL internal error: \
                      Assertion failed: trace_data->ingroup

because the set_trace_data() function invokes some callbacks which
generate trace output, but the correct channel type was set only
after the set_trace_data() call.

To fix the failed assertions, the correct channel type is now set
inside the set_trace_data() call, instead of doing it afterwards.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8463)
This commit is contained in:
Dr. Matthias St. Pierre 2019-03-13 00:14:55 +01:00
parent 13d06925e8
commit fe50e11571
2 changed files with 17 additions and 10 deletions
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7
apps/openssl.c
View file

@ -136,6 +136,8 @@ static size_t internal_trace_cb(const char *buf, size_t cnt,
switch (cmd) {
case OSSL_TRACE_CTRL_BEGIN:
if (!ossl_assert(!trace_data->ingroup))
return 0;
trace_data->ingroup = 1;
tid.ltid = 0;
@ -147,9 +149,14 @@ static size_t internal_trace_cb(const char *buf, size_t cnt,
strlen(buffer), buffer);
break;
case OSSL_TRACE_CTRL_WRITE:
if (!ossl_assert(trace_data->ingroup))
return 0;
ret = BIO_write(trace_data->bio, buf, cnt);
break;
case OSSL_TRACE_CTRL_END:
if (!ossl_assert(trace_data->ingroup))
return 0;
trace_data->ingroup = 0;
BIO_ctrl(trace_data->bio, PREFIX_CTRL_SET_PREFIX, 0, NULL);

20
crypto/trace.c
View file

@ -218,7 +218,7 @@ static int trace_detach_cb(int category, int type, const void *data)
return 1;
}
static int set_trace_data(int category, BIO **channel,
static int set_trace_data(int category, int type, BIO **channel,
const char **prefix, const char **suffix,
int (*attach_cb)(int, int, const void *),
int (*detach_cb)(int, int, const void *))
@ -253,11 +253,13 @@ static int set_trace_data(int category, BIO **channel,
if (channel != NULL && curr_channel != NULL) {
BIO_free(curr_channel);
trace_channels[category].type = 0;
trace_channels[category].bio = NULL;
}
/* Before running callbacks are done, set new data where appropriate */
if (channel != NULL && *channel != NULL) {
trace_channels[category].type = type;
trace_channels[category].bio = *channel;
}
@ -313,10 +315,11 @@ void ossl_trace_cleanup(void)
/* We force the TRACE category to be treated last */
if (category == OSSL_TRACE_CATEGORY_TRACE)
continue;
set_trace_data(category, &channel, &prefix, &suffix,
set_trace_data(category, 0, &channel, &prefix, &suffix,
trace_attach_cb, trace_detach_cb);
}
set_trace_data(OSSL_TRACE_CATEGORY_TRACE, &channel, &prefix, &suffix,
set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
&prefix, &suffix,
trace_attach_cb, trace_detach_cb);
CRYPTO_THREAD_lock_free(trace_lock);
#endif
@ -326,11 +329,9 @@ int OSSL_trace_set_channel(int category, BIO *channel)
{
#ifndef OPENSSL_NO_TRACE
if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM
|| !set_trace_data(category, &channel, NULL, NULL,
|| !set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
trace_attach_cb, trace_detach_cb))
return 0;
trace_channels[category].type = SIMPLE_CHANNEL;
#endif
return 1;
}
@ -381,11 +382,10 @@ int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
BIO_set_data(channel, trace_data);
}
if (!set_trace_data(category, &channel, NULL, NULL,
if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
trace_attach_w_callback_cb, trace_detach_cb))
goto err;
trace_channels[category].type = CALLBACK_CHANNEL;
goto done;
err:
@ -403,7 +403,7 @@ int OSSL_trace_set_prefix(int category, const char *prefix)
#ifndef OPENSSL_NO_TRACE
if (category >= 0 || category < OSSL_TRACE_CATEGORY_NUM)
return set_trace_data(category, NULL, &prefix, NULL,
return set_trace_data(category, 0, NULL, &prefix, NULL,
trace_attach_cb, trace_detach_cb);
rv = 0;
#endif
@ -416,7 +416,7 @@ int OSSL_trace_set_suffix(int category, const char *suffix)
#ifndef OPENSSL_NO_TRACE
if (category >= 0 || category < OSSL_TRACE_CATEGORY_NUM)
return set_trace_data(category, NULL, NULL, &suffix,
return set_trace_data(category, 0, NULL, NULL, &suffix,
trace_attach_cb, trace_detach_cb);
rv = 0;
#endif