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Merge branch '1600-g_timeout_add_seconds-overflow' into 'master'

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Resolve "g_timeout_source_new_seconds overflows when given interval > (G_MAXUINT / 1000)"

Closes #1600

See merge request GNOME/glib!496
This commit is contained in:
Philip Withnall 2018-11-27 10:53:20 +00:00
commit 389087eb11
3 changed files with 116 additions and 38 deletions
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15
glib/gmain.c
View File

@ -315,6 +315,7 @@ struct _GMainLoop
struct _GTimeoutSource
{
GSource source;
/* Measured in seconds if 'seconds' is TRUE, or milliseconds otherwise. */
guint interval;
gboolean seconds;
};
@ -3524,13 +3525,13 @@ g_main_context_prepare (GMainContext *context,
}
else
{
gint timeout;
gint64 timeout;
/* rounding down will lead to spinning, so always round up */
timeout = (source->priv->ready_time - context->time + 999) / 1000;
if (source_timeout < 0 || timeout < source_timeout)
source_timeout = timeout;
source_timeout = MIN (timeout, G_MAXINT);
}
}
@ -4615,8 +4616,6 @@ g_timeout_set_expiration (GTimeoutSource *timeout_source,
{
gint64 expiration;
expiration = current_time + (guint64) timeout_source->interval * 1000;
if (timeout_source->seconds)
{
gint64 remainder;
@ -4638,6 +4637,8 @@ g_timeout_set_expiration (GTimeoutSource *timeout_source,
timer_perturb = 0;
}
expiration = current_time + (guint64) timeout_source->interval * 1000 * 1000;
/* We want the microseconds part of the timeout to land on the
* 'timer_perturb' mark, but we need to make sure we don't try to
* set the timeout in the past. We do this by ensuring that we
@ -4653,6 +4654,10 @@ g_timeout_set_expiration (GTimeoutSource *timeout_source,
expiration -= remainder;
expiration += timer_perturb;
}
else
{
expiration = current_time + (guint64) timeout_source->interval * 1000;
}
g_source_set_ready_time ((GSource *) timeout_source, expiration);
}
@ -4735,7 +4740,7 @@ g_timeout_source_new_seconds (guint interval)
GSource *source = g_source_new (&g_timeout_funcs, sizeof (GTimeoutSource));
GTimeoutSource *timeout_source = (GTimeoutSource *)source;
timeout_source->interval = 1000 * interval;
timeout_source->interval = interval;
timeout_source->seconds = TRUE;
g_timeout_set_expiration (timeout_source, g_get_monotonic_time ());

95
glib/tests/timeout.c
View File

@ -14,7 +14,7 @@ stop_waiting (gpointer data)
}
static gboolean
function (gpointer data)
unreachable_callback (gpointer data)
{
g_assert_not_reached ();
@ -38,13 +38,14 @@ test_seconds (void)
* then we have trouble (since it ran in less than 2 seconds).
*
* We need a timeout of at least 2 seconds because
* g_timeout_add_second can add as much as an additional second of
* g_timeout_add_seconds() can add as much as an additional second of
* latency.
*/
g_test_bug ("https://bugzilla.gnome.org/show_bug.cgi?id=642052");
loop = g_main_loop_new (NULL, FALSE);
g_timeout_add (2100, stop_waiting, NULL);
id = g_timeout_add_seconds (21475, function, NULL);
id = g_timeout_add_seconds (21475, unreachable_callback, NULL);
g_main_loop_run (loop);
g_main_loop_unref (loop);
@ -52,6 +53,91 @@ test_seconds (void)
g_source_remove (id);
}
static void
test_weeks_overflow (void)
{
guint id;
guint interval_seconds;
/* Internally, the guint interval (in seconds) was converted to milliseconds
* then stored in a guint variable. This meant that any interval larger than
* G_MAXUINT / 1000 would overflow.
*
* On a system with 32-bit guint, the interval (G_MAXUINT / 1000) + 1 seconds
* (49.7 days) would end wrapping to 704 milliseconds.
*
* Test that that isn't true anymore by scheduling two jobs:
* - one, as above
* - another that runs in 2100ms
*
* If everything is working properly, the 2100ms one should run first
* (and exit the mainloop). If we ever see the other job run
* then we have trouble (since it ran in less than 2 seconds).
*
* We need a timeout of at least 2 seconds because
* g_timeout_add_seconds() can add as much as an additional second of
* latency.
*/
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/1600");
loop = g_main_loop_new (NULL, FALSE);
g_timeout_add (2100, stop_waiting, NULL);
interval_seconds = 1 + G_MAXUINT / 1000;
id = g_timeout_add_seconds (interval_seconds, unreachable_callback, NULL);
g_main_loop_run (loop);
g_main_loop_unref (loop);
g_source_remove (id);
}
/* The ready_time for a GSource is stored as a gint64, as an absolute monotonic
* time in microseconds. To call poll(), this must be converted to a relative
* timeout, in milliseconds, as a gint. If the ready_time is sufficiently far
* in the future, the timeout will not fit. Previously, it would be narrowed in
* an implementation-defined way; if this gave a negative result, poll() would
* block forever.
*
* This test creates a GSource with the largest possible ready_time (a little
* over 292 millennia, assuming g_get_monotonic_time() starts from near 0 when
* the system boots), adds it to a GMainContext, queries it for the parameters
* to pass to poll() -- essentially the first half of
* g_main_context_iteration() -- and checks that the timeout is a large
* positive number.
*/
static void
test_far_future_ready_time (void)
{
GSourceFuncs source_funcs = { 0 };
GMainContext *context = g_main_context_new ();
GSource *source = g_source_new (&source_funcs, sizeof (GSource));
gboolean acquired, ready;
gint priority, timeout_, n_fds;
g_source_set_ready_time (source, G_MAXINT64);
g_source_attach (source, context);
acquired = g_main_context_acquire (context);
g_assert_true (acquired);
ready = g_main_context_prepare (context, &priority);
g_assert_false (ready);
n_fds = 0;
n_fds = g_main_context_query (context, priority, &timeout_, NULL, n_fds);
/* The true timeout in milliseconds doesn't fit into a gint. We definitely
* don't want poll() to block forever:
*/
g_assert_cmpint (timeout_, >=, 0);
/* Instead, we want it to block for as long as possible: */
g_assert_cmpint (timeout_, ==, G_MAXINT);
g_main_context_release (context);
g_main_context_unref (context);
g_source_unref (source);
}
static gint64 last_time;
static gint count;
@ -102,8 +188,11 @@ int
main (int argc, char *argv[])
{
g_test_init (&argc, &argv, NULL);
g_test_bug_base ("");
g_test_add_func ("/timeout/seconds", test_seconds);
g_test_add_func ("/timeout/weeks-overflow", test_weeks_overflow);
g_test_add_func ("/timeout/far-future-ready-time", test_far_future_ready_time);
g_test_add_func ("/timeout/rounding", test_rounding);
return g_test_run ();

44
tests/gio-test.c
View File

@ -113,13 +113,11 @@ recv_message (GIOChannel *channel,
gint fd = g_io_channel_unix_get_fd (channel);
gboolean retval = TRUE;
#ifdef VERBOSE
g_print ("gio-test: ...from %d:%s%s%s%s\n", fd,
g_debug ("gio-test: ...from %d:%s%s%s%s", fd,
(cond & G_IO_ERR) ? " ERR" : "",
(cond & G_IO_HUP) ? " HUP" : "",
(cond & G_IO_IN) ? " IN" : "",
(cond & G_IO_PRI) ? " PRI" : "");
#endif
if (cond & (G_IO_ERR | G_IO_HUP))
{
@ -140,9 +138,7 @@ recv_message (GIOChannel *channel,
{
if (nb == 0)
{
#ifdef VERBOSE
g_print ("gio-test: ...from %d: EOF\n", fd);
#endif
g_debug ("gio-test: ...from %d: EOF", fd);
shutdown_source (data);
return FALSE;
}
@ -165,9 +161,7 @@ recv_message (GIOChannel *channel,
if (nb == 0)
{
#ifdef VERBOSE
g_print ("gio-test: ...from %d: EOF\n", fd);
#endif
g_debug ("gio-test: ...from %d: EOF", fd);
shutdown_source (data);
return FALSE;
}
@ -176,9 +170,7 @@ recv_message (GIOChannel *channel,
g_assert_cmpint (nbytes, <, BUFSIZE);
g_assert (nbytes >= 0 && nbytes < BUFSIZE);
#ifdef VERBOSE
g_print ("gio-test: ...from %d: %d bytes\n", fd, nbytes);
#endif
g_debug ("gio-test: ...from %d: %d bytes", fd, nbytes);
if (nbytes > 0)
{
error = read_all (fd, channel, buf, nbytes, &nb);
@ -188,18 +180,14 @@ recv_message (GIOChannel *channel,
if (nb == 0)
{
#ifdef VERBOSE
g_print ("gio-test: ...from %d: EOF\n", fd);
#endif
g_debug ("gio-test: ...from %d: EOF", fd);
shutdown_source (data);
return FALSE;
}
for (j = 0; j < nbytes; j++)
g_assert (buf[j] == ' ' + ((nbytes + j) % 95));
#ifdef VERBOSE
g_print ("gio-test: ...from %d: OK\n", fd);
#endif
g_debug ("gio-test: ...from %d: OK", fd);
}
}
return retval;
@ -266,7 +254,6 @@ main (int argc,
GIOChannel *my_read_channel;
gchar *cmdline;
guint *id;
int i;
#ifdef G_OS_WIN32
GTimeVal start, end;
@ -316,6 +303,7 @@ main (int argc,
for (i = 0; i < nkiddies; i++)
{
int pipe_to_sub[2], pipe_from_sub[2];
guint *id;
if (pipe (pipe_to_sub) == -1 ||
pipe (pipe_from_sub) == -1)
@ -328,10 +316,11 @@ main (int argc,
id = g_new (guint, 1);
*id =
g_io_add_watch (my_read_channel,
G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP,
recv_message,
id);
g_io_add_watch_full (my_read_channel,
G_PRIORITY_DEFAULT,
G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP,
recv_message,
id, g_free);
nrunning++;
@ -372,7 +361,6 @@ main (int argc,
g_main_loop_unref (main_loop);
g_free (seqtab);
g_free (id);
}
else if (argc == 3)
{
@ -404,10 +392,8 @@ main (int argc,
buflen = rand() % BUFSIZE;
for (j = 0; j < buflen; j++)
buf[j] = ' ' + ((buflen + j) % 95);
#ifdef VERBOSE
g_print ("gio-test: child writing %d+%d bytes to %d\n",
g_debug ("gio-test: child writing %d+%d bytes to %d",
(int)(sizeof(i) + sizeof(buflen)), buflen, writefd);
#endif
write (writefd, &i, sizeof (i));
write (writefd, &buflen, sizeof (buflen));
write (writefd, buf, buflen);
@ -424,9 +410,7 @@ main (int argc,
}
#endif
}
#ifdef VERBOSE
g_print ("gio-test: child exiting, closing %d\n", writefd);
#endif
g_debug ("gio-test: child exiting, closing %d", writefd);
close (writefd);
}
else