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checkSpace.pl now forbids more identifiers.

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The functions it warns about are:
  assert, memcmp, strcat, strcpy, sprintf, malloc, free, realloc,
  strdup, strndup, calloc.

Also, fix a few lingering instances of these in the code. Use other
conventions to indicate _intended_ use of assert and
malloc/realloc/etc.
This commit is contained in:
Nick Mathewson 2016-09-06 12:35:37 -04:00
parent 4e3f9c1f3a
commit 5927ed8d33
16 changed files with 69 additions and 39 deletions
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19
scripts/maint/checkSpace.pl
View File

@ -156,6 +156,25 @@ for $fn (@ARGV) {
$in_func_head = 0;
}
}
## Check for forbidden functions except when they are
# explicitly permitted
if (/\bassert\(/ && not /assert OK/) {
print "assert :$fn:$. (use tor_assert)\n";
}
if (/\bmemcmp\(/ && not /memcmp OK/) {
print "memcmp :$fn:$. (use {tor,fast}_mem{eq,neq,cmp}\n";
}
# always forbidden.
if (not / OVERRIDE /) {
if (/\bstrcat\(/ or /\bstrcpy\(/ or /\bsprintf\(/) {
print "$& :$fn:$.\n";
}
if (/\bmalloc\(/ or /\bfree\(/ or /\brealloc\(/ or
/\bstrdup\(/ or /\bstrndup\(/ or /\bcalloc\(/) {
print "$& :$fn:$. (use tor_malloc, tor_free, etc)\n";
}
}
}
}
## Warn if the file doesn't end with a blank line.

4
src/common/backtrace.c
View File

@ -117,7 +117,7 @@ log_backtrace(int severity, int domain, const char *msg)
for (i=0; i < depth; ++i) {
tor_log(severity, domain, " %s", symbols[i]);
}
free(symbols);
raw_free(symbols);
done:
tor_mutex_release(&cb_buf_mutex);
@ -190,7 +190,7 @@ install_bt_handler(void)
size_t depth = backtrace(cb_buf, MAX_DEPTH);
symbols = backtrace_symbols(cb_buf, (int) depth);
if (symbols)
free(symbols);
raw_free(symbols);
}
return rv;

2
src/common/compat.c
View File

@ -2350,7 +2350,7 @@ make_path_absolute(char *fname)
/* We don't want to assume that tor_free can free a string allocated
* with malloc. On failure, return fname (it's better than nothing). */
char *absfname = tor_strdup(absfname_malloced ? absfname_malloced : fname);
if (absfname_malloced) free(absfname_malloced);
if (absfname_malloced) raw_free(absfname_malloced);
return absfname;
#else

2
src/common/container.h
View File

@ -526,7 +526,7 @@ void* strmap_remove_lc(strmap_t *map, const char *key);
return (valtype*)digestmap_remove((digestmap_t*)map, key); \
} \
ATTR_UNUSED static inline void \
prefix##free(maptype *map, void (*free_val)(void*)) \
prefix##f##ree(maptype *map, void (*free_val)(void*)) \
{ \
digestmap_free((digestmap_t*)map, free_val); \
} \

16
src/common/log.c
View File

@ -47,6 +47,8 @@
#define TRUNCATED_STR_LEN 14
/** @} */
#define raw_assert(x) assert(x) // assert OK
/** Information for a single logfile; only used in log.c */
typedef struct logfile_t {
struct logfile_t *next; /**< Next logfile_t in the linked list. */
@ -75,7 +77,7 @@ sev_to_string(int severity)
case LOG_ERR: return "err";
default: /* Call assert, not tor_assert, since tor_assert
* calls log on failure. */
assert(0); return "UNKNOWN"; // LCOV_EXCL_LINE
raw_assert(0); return "UNKNOWN"; // LCOV_EXCL_LINE
}
}
@ -95,7 +97,7 @@ should_log_function_name(log_domain_mask_t domain, int severity)
return (domain & (LD_BUG|LD_NOFUNCNAME)) == LD_BUG;
default:
/* Call assert, not tor_assert, since tor_assert calls log on failure. */
assert(0); return 0; // LCOV_EXCL_LINE
raw_assert(0); return 0; // LCOV_EXCL_LINE
}
}
@ -293,7 +295,7 @@ format_msg(char *buf, size_t buf_len,
char *end_of_prefix;
char *buf_end;
assert(buf_len >= 16); /* prevent integer underflow and general stupidity */
raw_assert(buf_len >= 16); /* prevent integer underflow and stupidity */
buf_len -= 2; /* subtract 2 characters so we have room for \n\0 */
buf_end = buf+buf_len; /* point *after* the last char we can write to */
@ -482,12 +484,12 @@ logv,(int severity, log_domain_mask_t domain, const char *funcname,
int callbacks_deferred = 0;
/* Call assert, not tor_assert, since tor_assert calls log on failure. */
assert(format);
raw_assert(format);
/* check that severity is sane. Overrunning the masks array leads to
* interesting and hard to diagnose effects */
assert(severity >= LOG_ERR && severity <= LOG_DEBUG);
raw_assert(severity >= LOG_ERR && severity <= LOG_DEBUG);
/* check that we've initialised the log mutex before we try to lock it */
assert(log_mutex_initialized);
raw_assert(log_mutex_initialized);
LOCK_LOGS();
if ((! (domain & LD_NOCB)) && pending_cb_messages
@ -658,7 +660,7 @@ tor_log_update_sigsafe_err_fds(void)
if (!found_real_stderr &&
int_array_contains(sigsafe_log_fds, n_sigsafe_log_fds, STDOUT_FILENO)) {
/* Don't use a virtual stderr when we're also logging to stdout. */
assert(n_sigsafe_log_fds >= 2); /* Don't use assert inside log functions*/
raw_assert(n_sigsafe_log_fds >= 2); /* Don't tor_assert inside log fns */
sigsafe_log_fds[0] = sigsafe_log_fds[--n_sigsafe_log_fds];
}

6
src/common/util.c
View File

@ -147,7 +147,7 @@ tor_malloc_(size_t size DMALLOC_PARAMS)
#ifdef USE_DMALLOC
result = dmalloc_malloc(file, line, size, DMALLOC_FUNC_MALLOC, 0, 0);
#else
result = malloc(size);
result = raw_malloc(size);
#endif
if (PREDICT_UNLIKELY(result == NULL)) {
@ -246,7 +246,7 @@ tor_realloc_(void *ptr, size_t size DMALLOC_PARAMS)
#ifdef USE_DMALLOC
result = dmalloc_realloc(file, line, ptr, size, DMALLOC_FUNC_REALLOC, 0);
#else
result = realloc(ptr, size);
result = raw_realloc(ptr, size);
#endif
if (PREDICT_UNLIKELY(result == NULL)) {
@ -285,7 +285,7 @@ tor_strdup_(const char *s DMALLOC_PARAMS)
#ifdef USE_DMALLOC
duplicate = dmalloc_strdup(file, line, s, 0);
#else
duplicate = strdup(s);
duplicate = raw_strdup(s);
#endif
if (PREDICT_UNLIKELY(duplicate == NULL)) {
/* LCOV_EXCL_START */

10
src/common/util.h
View File

@ -82,7 +82,7 @@ extern int dmalloc_free(const char *file, const int line, void *pnt,
*/
#define tor_free(p) STMT_BEGIN \
if (PREDICT_LIKELY((p)!=NULL)) { \
free(p); \
raw_free(p); \
(p)=NULL; \
} \
STMT_END
@ -99,6 +99,14 @@ extern int dmalloc_free(const char *file, const int line, void *pnt,
#define tor_memdup(s, n) tor_memdup_(s, n DMALLOC_ARGS)
#define tor_memdup_nulterm(s, n) tor_memdup_nulterm_(s, n DMALLOC_ARGS)
/* Aliases for the underlying system malloc/realloc/free. Only use
* them to indicate "I really want the underlying system function, I know
* what I'm doing." */
#define raw_malloc malloc
#define raw_realloc realloc
#define raw_free free
#define raw_strdup strdup
void tor_log_mallinfo(int severity);
/** Return the offset of <b>member</b> within the type <b>tp</b>, in bytes */

8
src/or/channel.c
View File

@ -838,7 +838,7 @@ channel_free(channel_t *chan)
}
/* Call a free method if there is one */
if (chan->free) chan->free(chan);
if (chan->free_fn) chan->free_fn(chan);
channel_clear_remote_end(chan);
@ -878,7 +878,7 @@ channel_listener_free(channel_listener_t *chan_l)
tor_assert(!(chan_l->registered));
/* Call a free method if there is one */
if (chan_l->free) chan_l->free(chan_l);
if (chan_l->free_fn) chan_l->free_fn(chan_l);
/*
* We're in CLOSED or ERROR, so the incoming channel queue is already
@ -916,7 +916,7 @@ channel_force_free(channel_t *chan)
}
/* Call a free method if there is one */
if (chan->free) chan->free(chan);
if (chan->free_fn) chan->free_fn(chan);
channel_clear_remote_end(chan);
@ -958,7 +958,7 @@ channel_listener_force_free(channel_listener_t *chan_l)
chan_l);
/* Call a free method if there is one */
if (chan_l->free) chan_l->free(chan_l);
if (chan_l->free_fn) chan_l->free_fn(chan_l);
/*
* The incoming list just gets emptied and freed; we request close on

4
src/or/channel.h
View File

@ -90,7 +90,7 @@ struct channel_s {
/* Methods implemented by the lower layer */
/** Free a channel */
void (*free)(channel_t *);
void (*free_fn)(channel_t *);
/** Close an open channel */
void (*close)(channel_t *);
/** Describe the transport subclass for this channel */
@ -273,7 +273,7 @@ struct channel_listener_s {
/* Methods implemented by the lower layer */
/** Free a channel */
void (*free)(channel_listener_t *);
void (*free_fn)(channel_listener_t *);
/** Close an open channel */
void (*close)(channel_listener_t *);
/** Describe the transport subclass for this channel */

2
src/or/channeltls.c
View File

@ -117,7 +117,7 @@ channel_tls_common_init(channel_tls_t *tlschan)
chan->state = CHANNEL_STATE_OPENING;
chan->close = channel_tls_close_method;
chan->describe_transport = channel_tls_describe_transport_method;
chan->free = channel_tls_free_method;
chan->free_fn = channel_tls_free_method;
chan->get_overhead_estimate = channel_tls_get_overhead_estimate_method;
chan->get_remote_addr = channel_tls_get_remote_addr_method;
chan->get_remote_descr = channel_tls_get_remote_descr_method;

2
src/or/shared_random.c
View File

@ -578,7 +578,7 @@ commit_is_authoritative(const sr_commit_t *commit,
tor_assert(commit);
tor_assert(voter_key);
return !memcmp(commit->rsa_identity, voter_key,
return fast_memeq(commit->rsa_identity, voter_key,
sizeof(commit->rsa_identity));
}

4
src/test/bench.c
View File

@ -557,7 +557,7 @@ bench_dh(void)
dh_b, dh_pubkey_a, sizeof(dh_pubkey_a),
secret_b, sizeof(secret_b));
tor_assert(slen_a == slen_b);
tor_assert(!memcmp(secret_a, secret_b, slen_a));
tor_assert(fast_memeq(secret_a, secret_b, slen_a));
crypto_dh_free(dh_a);
crypto_dh_free(dh_b);
}
@ -595,7 +595,7 @@ bench_ecdh_impl(int nid, const char *name)
NULL);
tor_assert(slen_a == slen_b);
tor_assert(!memcmp(secret_a, secret_b, slen_a));
tor_assert(fast_memeq(secret_a, secret_b, slen_a));
EC_KEY_free(dh_a);
EC_KEY_free(dh_b);
}

13
src/test/test-memwipe.c
View File

@ -5,6 +5,7 @@
#include "crypto.h"
#include "compat.h"
#include "util.h"
static unsigned fill_a_buffer_memset(void) __attribute__((noinline));
static unsigned fill_a_buffer_memwipe(void) __attribute__((noinline));
@ -98,29 +99,29 @@ static char *heap_buf = NULL;
static unsigned
fill_heap_buffer_memset(void)
{
char *buf = heap_buf = malloc(BUF_LEN);
char *buf = heap_buf = raw_malloc(BUF_LEN);
FILL_BUFFER_IMPL()
memset(buf, 0, BUF_LEN);
free(buf);
raw_free(buf);
return sum;
}
static unsigned
fill_heap_buffer_memwipe(void)
{
char *buf = heap_buf = malloc(BUF_LEN);
char *buf = heap_buf = raw_malloc(BUF_LEN);
FILL_BUFFER_IMPL()
memwipe(buf, 0, BUF_LEN);
free(buf);
raw_free(buf);
return sum;
}
static unsigned
fill_heap_buffer_nothing(void)
{
char *buf = heap_buf = malloc(BUF_LEN);
char *buf = heap_buf = raw_malloc(BUF_LEN);
FILL_BUFFER_IMPL()
free(buf);
raw_free(buf);
return sum;
}

8
src/test/test_addr.c
View File

@ -81,7 +81,7 @@ test_addr_basic(void *arg)
#define test_op_ip6_(a,op,b,e1,e2) \
STMT_BEGIN \
tt_assert_test_fmt_type(a,b,e1" "#op" "e2,struct in6_addr*, \
(memcmp(val1_->s6_addr, val2_->s6_addr, 16) op 0), \
(fast_memcmp(val1_->s6_addr, val2_->s6_addr, 16) op 0), \
char *, "%s", \
{ char *cp; \
cp = print_ = tor_malloc(64); \
@ -1037,17 +1037,17 @@ test_addr_make_null(void *data)
(void) data;
/* Ensure that before tor_addr_make_null, addr != 0's */
memset(addr, 1, sizeof(*addr));
tt_int_op(memcmp(addr, zeros, sizeof(*addr)), OP_NE, 0);
tt_int_op(fast_memcmp(addr, zeros, sizeof(*addr)), OP_NE, 0);
/* Test with AF == AF_INET */
zeros->family = AF_INET;
tor_addr_make_null(addr, AF_INET);
tt_int_op(memcmp(addr, zeros, sizeof(*addr)), OP_EQ, 0);
tt_int_op(fast_memcmp(addr, zeros, sizeof(*addr)), OP_EQ, 0);
tt_str_op(tor_addr_to_str(buf, addr, sizeof(buf), 0), OP_EQ, "0.0.0.0");
/* Test with AF == AF_INET6 */
memset(addr, 1, sizeof(*addr));
zeros->family = AF_INET6;
tor_addr_make_null(addr, AF_INET6);
tt_int_op(memcmp(addr, zeros, sizeof(*addr)), OP_EQ, 0);
tt_int_op(fast_memcmp(addr, zeros, sizeof(*addr)), OP_EQ, 0);
tt_str_op(tor_addr_to_str(buf, addr, sizeof(buf), 0), OP_EQ, "::");
done:
tor_free(addr);

2
src/test/test_crypto.c
View File

@ -2258,7 +2258,7 @@ test_crypto_ed25519_simple(void *arg)
tt_int_op(0, OP_EQ, ed25519_sign(&manual_sig, (uint8_t *)prefixed_msg,
strlen(prefixed_msg), &kp1));
tor_free(prefixed_msg);
tt_assert(!memcmp(sig1.sig, manual_sig.sig, sizeof(sig1.sig)));
tt_assert(fast_memeq(sig1.sig, manual_sig.sig, sizeof(sig1.sig)));
/* Test that prefixed checksig verifies it properly. */
tt_int_op(0, OP_EQ, ed25519_checksig_prefixed(&sig1, msg, msg_len,

4
src/test/test_dir.c
View File

@ -2052,9 +2052,9 @@ test_a_networkstatus(
tt_int_op(4,OP_EQ, smartlist_len(con->voters)); /*3 voters, 1 legacy key.*/
/* The voter id digests should be in this order. */
tt_assert(memcmp(cert2->cache_info.identity_digest,
tt_assert(fast_memcmp(cert2->cache_info.identity_digest,
cert1->cache_info.identity_digest,DIGEST_LEN)<0);
tt_assert(memcmp(cert1->cache_info.identity_digest,
tt_assert(fast_memcmp(cert1->cache_info.identity_digest,
cert3->cache_info.identity_digest,DIGEST_LEN)<0);
test_same_voter(smartlist_get(con->voters, 1),
smartlist_get(v2->voters, 0));