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mbedtls: Patches from 2.7 to fix timing test failures
Changed to Changelog are removed to make patches apply on 2.6. Signed-off-by: Lev Stipakov <lev@openvpn.net>
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413
deps/mbedtls/patches/0008-New-timing-unit-tests.patch
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deps/mbedtls/patches/0008-New-timing-unit-tests.patch
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From 8064bf3adf0298873ed4f6bc0dd89ee6efae3959 Mon Sep 17 00:00:00 2001
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From: Gilles Peskine <Gilles.Peskine@arm.com>
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Date: Tue, 10 Oct 2017 19:56:06 +0200
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Subject: [PATCH] New timing unit tests
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New set of unit tests for the timing module, instead of just running
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the selftest function.
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The selftest function sometimes fails on a heavily loaded
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machine (such as a typical continuous integration system). Because of
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the all-in-one nature of the test and because the exact load pattern
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can be hard to reproduce, it is difficult to diagnose failures of CI
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runs with selftest. The new tests are more separated and I strove to
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point out potential failure modes in comments.
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* mbedtls_timing_hardclock: not tested. This function gives so few
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guarantees that there isn't much to test, and it is hard to test
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reliably because clock cycles don't easily relate to time in any
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remotely portable way. This function isn't used in the library
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anyway, it's only there for benchmark programs.
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* mbedtls_timing_get_timer: tested by setting a timer and verifying
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that it reaches its target, and by verifying that a timer started
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later than another always has a smaller elapsed time.
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* mbedtls_set_alarm: tested by setting an alarm, busy-waiting for it
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and measuring the elapsed time with a timer.
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* mbedtls_timing_set_delay, mbedtls_timing_get_delay: tested by
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setting a delay object and watching it go through its two delay
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values, using a timer to check that the delays are passed at the
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expected time.
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The tests pass under light to moderate load, but some of them can be
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defeated with sufficiently heavy load. This is unavoidable since the
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test process to be effectively suspended for any length of time,
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making us think that a timer has gone on for too long.
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---
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tests/suites/test_suite_timing.data | 40 ++++-
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tests/suites/test_suite_timing.function | 309 +++++++++++++++++++++++++++++++-
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3 files changed, 345 insertions(+), 5 deletions(-)
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diff --git a/tests/suites/test_suite_timing.data b/tests/suites/test_suite_timing.data
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index 3ba79a47..02677d12 100644
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--- a/tests/suites/test_suite_timing.data
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+++ b/tests/suites/test_suite_timing.data
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@@ -1,2 +1,38 @@
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-Timing selftest
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-timing_selftest:
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+Timing: basic timer operation
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+timing_timer_simple:
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+
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+Timing: timer reset
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+timing_timer_reset:
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+
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+Timing: two parallel timers, delay 0
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+timing_two_timers:0:
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+
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+Timing: two parallel timers, delay 100
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+timing_two_timers:100:
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+
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+Timing: two parallel timers, delay 1000
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+timing_two_timers:1000:
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+
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+Timing: two parallel timers, delay 10000
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+timing_two_timers:10000:
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+
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+Timing: delay 0ms, 0ms
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+timing_delay:0:0:
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+
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+Timing: delay 0ms, 50ms
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+timing_delay:0:50:
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+
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+Timing: delay 50ms, 50ms
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+timing_delay:50:50:
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+
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+Timing: delay 50ms, 100ms
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+timing_delay:50:100:
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+
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+Timing: delay 50ms, 200ms
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+timing_delay:50:200:
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+
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+Timing: alarm in 0 second
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+timing_alarm:0:
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+
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+Timing: alarm in 1 second
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+timing_alarm:1:
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diff --git a/tests/suites/test_suite_timing.function b/tests/suites/test_suite_timing.function
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index 5882f85d..53e0ac32 100644
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--- a/tests/suites/test_suite_timing.function
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+++ b/tests/suites/test_suite_timing.function
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@@ -1,5 +1,43 @@
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/* BEGIN_HEADER */
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+
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+/* This test module exercises the timing module. One of the expected failure
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+ modes is for timers to never expire, which could lead to an infinite loop.
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+ The function timing_timer_simple is protected against this failure mode and
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+ checks that timers do expire. Other functions will terminate if their
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+ timers do expire. Therefore it is recommended to run timing_timer_simple
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+ first and run other test functions only if that timing_timer_simple
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+ succeeded. */
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+
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+#include <limits.h>
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+
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#include "mbedtls/timing.h"
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+
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+/* Wait this many milliseconds for a short timing test. This duration
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+ should be large enough that, in practice, if you read the timer
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+ value twice in a row, it won't have jumped by that much. */
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+#define TIMING_SHORT_TEST_MS 100
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+
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+/* A loop that waits TIMING_SHORT_TEST_MS must not take more than this many
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+ iterations. This value needs to be large enough to accommodate fast
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+ platforms (e.g. at 4GHz and 10 cycles/iteration a CPU can run through 20
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+ million iterations in 50ms). The only motivation to keep this value low is
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+ to avoid having an infinite loop if the timer functions are not implemented
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+ correctly. Ideally this value should be based on the processor speed but we
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+ don't have this information! */
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+#define TIMING_SHORT_TEST_ITERATIONS_MAX 1e8
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+
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+/* alarm(0) must fire in no longer than this amount of time. */
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+#define TIMING_ALARM_0_DELAY_MS TIMING_SHORT_TEST_MS
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+
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+static int expected_delay_status( uint32_t int_ms, uint32_t fin_ms,
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+ unsigned long actual_ms )
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+{
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+ return( fin_ms == 0 ? -1 :
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+ actual_ms >= fin_ms ? 2 :
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+ actual_ms >= int_ms ? 1 :
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+ 0 );
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+}
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+
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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@@ -7,9 +45,274 @@
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* END_DEPENDENCIES
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*/
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-/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
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-void timing_selftest()
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+/* BEGIN_CASE */
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+void timing_timer_simple( )
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{
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- TEST_ASSERT( mbedtls_timing_self_test( 1 ) == 0 );
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+ struct mbedtls_timing_hr_time timer;
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+ unsigned long millis = 0;
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+ unsigned long new_millis = 0;
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+ unsigned long iterations = 0;
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+ /* Start the timer. */
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+ (void) mbedtls_timing_get_timer( &timer, 1 );
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+ /* Busy-wait loop for a few milliseconds. */
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+ do
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+ {
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+ new_millis = mbedtls_timing_get_timer( &timer, 0 );
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+ ++iterations;
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+ /* Check that the timer didn't go backwards */
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+ TEST_ASSERT( new_millis >= millis );
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+ millis = new_millis;
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+ }
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+ while( millis < TIMING_SHORT_TEST_MS &&
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+ iterations <= TIMING_SHORT_TEST_ITERATIONS_MAX );
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+ /* The wait duration should have been large enough for at least a
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+ few runs through the loop, even on the slowest realistic platform. */
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+ TEST_ASSERT( iterations >= 2 );
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+ /* The wait duration shouldn't have overflowed the iteration count. */
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+ TEST_ASSERT( iterations < TIMING_SHORT_TEST_ITERATIONS_MAX );
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+ return;
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+
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+exit:
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+ /* No cleanup needed, but show some diagnostic iterations, because timing
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+ problems can be hard to reproduce. */
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+ mbedtls_fprintf( stdout, " Finished with millis=%lu new_millis=%lu get(timer)<=%lu iterations=%lu\n",
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+ millis, new_millis, mbedtls_timing_get_timer( &timer, 0 ),
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+ iterations );
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}
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/* END_CASE */
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+
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+/* BEGIN_CASE */
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+void timing_timer_reset( )
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+{
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+ struct mbedtls_timing_hr_time timer;
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+ unsigned long millis = 0;
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+ unsigned long iterations = 0;
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+ /* Start the timer. Timers are always reset to 0. */
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+ TEST_ASSERT( mbedtls_timing_get_timer( &timer, 1 ) == 0 );
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+ /* Busy-wait loop for a few milliseconds */
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+ do
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+ {
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+ ++iterations;
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+ millis = mbedtls_timing_get_timer( &timer, 0 );
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+ }
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+ while( millis < TIMING_SHORT_TEST_MS );
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+
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+ /* Reset the timer and check that it has restarted. */
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+ TEST_ASSERT( mbedtls_timing_get_timer( &timer, 1 ) == 0 );
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+ /* Read the timer immediately after reset. It should be 0 or close
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+ to it. */
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+ TEST_ASSERT( mbedtls_timing_get_timer( &timer, 0 ) < TIMING_SHORT_TEST_MS );
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+ return;
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+
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+exit:
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+ /* No cleanup needed, but show some diagnostic information, because timing
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+ problems can be hard to reproduce. */
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+ mbedtls_fprintf( stdout, " Finished with millis=%lu get(timer)<=%lu iterations=%lu\n",
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+ millis, mbedtls_timing_get_timer( &timer, 0 ),
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+ iterations );
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+}
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+/* END_CASE */
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+
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+/* BEGIN_CASE */
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+void timing_two_timers( int delta )
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+{
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+ struct mbedtls_timing_hr_time timer1, timer2;
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+ unsigned long millis1, millis2;
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+
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+ /* Start the first timer and wait for a short time. */
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+ (void) mbedtls_timing_get_timer( &timer1, 1 );
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+ do
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+ {
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+ millis1 = mbedtls_timing_get_timer( &timer1, 0 );
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+ }
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+ while( millis1 < TIMING_SHORT_TEST_MS );
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+
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+ /* Do a short busy-wait, so that the difference between timer1 and timer2
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+ doesn't practically always end up being very close to a whole number of
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+ milliseconds. */
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+ while( delta > 0 )
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+ --delta;
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+
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+ /* Start the second timer and compare it with the first. */
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+ mbedtls_timing_get_timer( &timer2, 1 );
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+ do
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+ {
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+ millis1 = mbedtls_timing_get_timer( &timer1, 0 );
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+ millis2 = mbedtls_timing_get_timer( &timer2, 0 );
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+ /* The first timer should always be ahead of the first. */
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+ TEST_ASSERT( millis1 > millis2 );
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+ /* The timers shouldn't drift apart, i.e. millis2-millis1 should stay
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+ roughly constant, but this is hard to test reliably, especially in
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+ a busy environment such as an overloaded continuous integration
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+ system, so we don't test it it. */
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+ }
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+ while( millis2 < TIMING_SHORT_TEST_MS );
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+
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+ return;
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+
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+exit:
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+ /* No cleanup needed, but show some diagnostic iterations, because timing
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+ problems can be hard to reproduce. */
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+ mbedtls_fprintf( stdout, " Finished with millis1=%lu get(timer1)<=%lu millis2=%lu get(timer2)<=%lu\n",
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+ millis1, mbedtls_timing_get_timer( &timer1, 0 ),
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+ millis2, mbedtls_timing_get_timer( &timer2, 0 ) );
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+}
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+/* END_CASE */
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+
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+/* BEGIN_CASE */
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+void timing_alarm( int seconds )
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+{
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+ struct mbedtls_timing_hr_time timer;
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+ unsigned long millis = 0;
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+ /* We check that about the desired number of seconds has elapsed. Be
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+ slightly liberal with the lower bound, so as to allow platforms where
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+ the alarm (with second resolution) and the timer (with millisecond
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+ resolution) are based on different clocks. Be very liberal with the
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+ upper bound, because the platform might be busy. */
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+ unsigned long millis_min = ( seconds > 0 ?
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+ seconds * 900 :
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+ 0 );
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+ unsigned long millis_max = ( seconds > 0 ?
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+ seconds * 1100 + 400 :
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+ TIMING_ALARM_0_DELAY_MS );
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+ unsigned long iterations = 0;
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+
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+ /* Set an alarm and count how long it takes with a timer. */
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+ (void) mbedtls_timing_get_timer( &timer, 1 );
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+ mbedtls_set_alarm( seconds );
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+
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+ if( seconds > 0 )
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+ {
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+ /* We set the alarm for at least 1 second. It should not have fired
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+ immediately, even on a slow and busy platform. */
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+ TEST_ASSERT( !mbedtls_timing_alarmed );
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+ }
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+ /* A 0-second alarm should fire quickly, but we don't guarantee that it
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+ fires immediately, so mbedtls_timing_alarmed may or may not be set at
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+ this point. */
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+
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+ /* Busy-wait until the alarm rings */
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+ do
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+ {
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+ ++iterations;
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+ millis = mbedtls_timing_get_timer( &timer, 0 );
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+ }
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+ while( !mbedtls_timing_alarmed && millis <= millis_max );
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+
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+ TEST_ASSERT( mbedtls_timing_alarmed );
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+ TEST_ASSERT( millis >= millis_min );
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+ TEST_ASSERT( millis <= millis_max );
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+
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+ mbedtls_timing_alarmed = 0;
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+ return;
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+
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+exit:
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+ /* Show some diagnostic iterations, because timing
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+ problems can be hard to reproduce. */
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+ mbedtls_fprintf( stdout, " Finished with alarmed=%d millis=%lu get(timer)<=%lu iterations=%lu\n",
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+ mbedtls_timing_alarmed,
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+ millis, mbedtls_timing_get_timer( &timer, 0 ),
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+ iterations );
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+ /* Cleanup */
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+ mbedtls_timing_alarmed = 0;
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+}
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+/* END_CASE */
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+
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+/* BEGIN_CASE */
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+void timing_delay( int int_ms, int fin_ms )
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+{
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+ /* This function assumes that if int_ms is nonzero then it is large
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+ enough that we have time to read all timers at least once in an
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+ interval of time lasting int_ms milliseconds, and likewise for (fin_ms
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+ - int_ms). So don't call it with arguments that are too small. */
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+
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+ mbedtls_timing_delay_context delay;
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+ struct mbedtls_timing_hr_time timer;
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+ unsigned long delta; /* delay started between timer=0 and timer=delta */
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+ unsigned long before = 0, after = 0;
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+ unsigned long iterations = 0;
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+ int status = -2;
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+ int saw_status_1 = 0;
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+ int warn_inconclusive = 0;
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+
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+ assert( int_ms >= 0 );
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+ assert( fin_ms >= 0 );
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+
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+ /* Start a reference timer. Program a delay, and verify that the status of
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+ the delay is consistent with the time given by the reference timer. */
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+ (void) mbedtls_timing_get_timer( &timer, 1 );
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+ mbedtls_timing_set_delay( &delay, int_ms, fin_ms );
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+ /* Set delta to an upper bound for the interval between the start of timer
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+ and the start of delay. Reading timer after starting delay gives us an
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+ upper bound for the interval, rounded to a 1ms precision. Since this
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+ might have been rounded down, but we need an upper bound, we add 1. */
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+ delta = mbedtls_timing_get_timer( &timer, 0 ) + 1;
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+
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+ status = mbedtls_timing_get_delay( &delay );
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+ if( fin_ms == 0 )
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+ {
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+ /* Cancelled timer. Just check the correct status for this case. */
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+ TEST_ASSERT( status == -1 );
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+ return;
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||||
+ }
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+
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||||
+ /* Initially, none of the delays must be passed yet if they're nonzero.
|
||||
+ This could fail for very small values of int_ms and fin_ms, where "very
|
||||
+ small" depends how fast and how busy the platform is. */
|
||||
+ if( int_ms > 0 )
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||||
+ {
|
||||
+ TEST_ASSERT( status == 0 );
|
||||
+ }
|
||||
+ else
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||||
+ {
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+ TEST_ASSERT( status == 1 );
|
||||
+ }
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||||
+
|
||||
+ do
|
||||
+ {
|
||||
+ unsigned long delay_min, delay_max;
|
||||
+ int status_min, status_max;
|
||||
+ ++iterations;
|
||||
+ before = mbedtls_timing_get_timer( &timer, 0 );
|
||||
+ status = mbedtls_timing_get_delay( &delay );
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||||
+ after = mbedtls_timing_get_timer( &timer, 0 );
|
||||
+ /* At a time between before and after, the delay's status was status.
|
||||
+ Check that this is consistent given that the delay was started
|
||||
+ between times 0 and delta. */
|
||||
+ delay_min = ( before > delta ? before - delta : 0 );
|
||||
+ status_min = expected_delay_status( int_ms, fin_ms, delay_min );
|
||||
+ delay_max = after;
|
||||
+ status_max = expected_delay_status( int_ms, fin_ms, delay_max );
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||||
+ TEST_ASSERT( status >= status_min );
|
||||
+ TEST_ASSERT( status <= status_max );
|
||||
+ if( status == 1 )
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+ saw_status_1 = 1;
|
||||
+ }
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||||
+ while ( before <= fin_ms + delta && status != 2 );
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||||
+
|
||||
+ /* Since we've waited at least fin_ms, the delay must have fully
|
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+ expired. */
|
||||
+ TEST_ASSERT( status == 2 );
|
||||
+
|
||||
+ /* If the second delay is more than the first, then there must have been a
|
||||
+ point in time when the first delay was passed but not the second delay.
|
||||
+ This could fail for very small values of (fin_ms - int_ms), where "very
|
||||
+ small" depends how fast and how busy the platform is. In practice, this
|
||||
+ is the test that's most likely to fail on a heavily loaded machine. */
|
||||
+ if( fin_ms > int_ms )
|
||||
+ {
|
||||
+ warn_inconclusive = 1;
|
||||
+ TEST_ASSERT( saw_status_1 );
|
||||
+ }
|
||||
+
|
||||
+ return;
|
||||
+
|
||||
+exit:
|
||||
+ /* No cleanup needed, but show some diagnostic iterations, because timing
|
||||
+ problems can be hard to reproduce. */
|
||||
+ mbedtls_fprintf( stdout, " Finished with delta=%lu before=%lu after=%lu status=%d iterations=%lu\n",
|
||||
+ delta, before, after, status, iterations );
|
||||
+ if( warn_inconclusive )
|
||||
+ mbedtls_fprintf( stdout, " Inconclusive test, try running it on a less heavily loaded machine.\n" );
|
||||
+ }
|
||||
+/* END_CASE */
|
||||
--
|
||||
2.14.3 (Apple Git-98)
|
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|
44
deps/mbedtls/patches/0009-Timing-self-test-increased-tolerance.patch
vendored
Normal file
44
deps/mbedtls/patches/0009-Timing-self-test-increased-tolerance.patch
vendored
Normal file
@ -0,0 +1,44 @@
|
||||
From 0f59b130a95a9990fb1f00a5f457d4bad0c23d41 Mon Sep 17 00:00:00 2001
|
||||
From: Gilles Peskine <Gilles.Peskine@arm.com>
|
||||
Date: Tue, 17 Oct 2017 19:39:04 +0200
|
||||
Subject: [PATCH] Timing self test: increased tolerance
|
||||
|
||||
mbedtls_timing_self_test fails annoyingly often when running on a busy
|
||||
machine such as can be expected of a continous integration system.
|
||||
Increase the tolerances in the delay test, to reduce the chance of
|
||||
failures that are only due to missing a deadline on a busy machine.
|
||||
---
|
||||
library/timing.c | 8 ++++----
|
||||
1 file changed, 4 insertions(+), 4 deletions(-)
|
||||
|
||||
diff --git a/library/timing.c b/library/timing.c
|
||||
index 744e1e79..115204dc 100644
|
||||
--- a/library/timing.c
|
||||
+++ b/library/timing.c
|
||||
@@ -450,19 +450,19 @@ int mbedtls_timing_self_test( int verbose )
|
||||
{
|
||||
mbedtls_timing_set_delay( &ctx, a, a + b );
|
||||
|
||||
- busy_msleep( a - a / 8 );
|
||||
+ busy_msleep( a - a / 4 );
|
||||
if( mbedtls_timing_get_delay( &ctx ) != 0 )
|
||||
FAIL;
|
||||
|
||||
- busy_msleep( a / 4 );
|
||||
+ busy_msleep( a / 2 );
|
||||
if( mbedtls_timing_get_delay( &ctx ) != 1 )
|
||||
FAIL;
|
||||
|
||||
- busy_msleep( b - a / 8 - b / 8 );
|
||||
+ busy_msleep( b - a / 4 - b / 4 );
|
||||
if( mbedtls_timing_get_delay( &ctx ) != 1 )
|
||||
FAIL;
|
||||
|
||||
- busy_msleep( b / 4 );
|
||||
+ busy_msleep( b / 2 );
|
||||
if( mbedtls_timing_get_delay( &ctx ) != 2 )
|
||||
FAIL;
|
||||
}
|
||||
--
|
||||
2.14.3 (Apple Git-98)
|
||||
|
32
deps/mbedtls/patches/0010-Timing-fix-mbedtls_set_alarm-0-on-Unix-POSIX.patch
vendored
Normal file
32
deps/mbedtls/patches/0010-Timing-fix-mbedtls_set_alarm-0-on-Unix-POSIX.patch
vendored
Normal file
@ -0,0 +1,32 @@
|
||||
From a0af95f052fa734c662dfe420d3e34e6ed777ed5 Mon Sep 17 00:00:00 2001
|
||||
From: Gilles Peskine <Gilles.Peskine@arm.com>
|
||||
Date: Tue, 10 Oct 2017 20:10:46 +0200
|
||||
Subject: [PATCH] Timing: fix mbedtls_set_alarm(0) on Unix/POSIX
|
||||
|
||||
The POSIX/Unix implementation of mbedtls_set_alarm did not set the
|
||||
mbedtls_timing_alarmed flag when called with 0, which was inconsistent
|
||||
with what the documentation implied and with the Windows behavior.
|
||||
---
|
||||
library/timing.c | 6 ++++++
|
||||
2 files changed, 7 insertions(+)
|
||||
|
||||
diff --git a/library/timing.c b/library/timing.c
|
||||
index a7c7ff02..4576f317 100644
|
||||
--- a/library/timing.c
|
||||
+++ b/library/timing.c
|
||||
@@ -315,6 +315,12 @@ void mbedtls_set_alarm( int seconds )
|
||||
mbedtls_timing_alarmed = 0;
|
||||
signal( SIGALRM, sighandler );
|
||||
alarm( seconds );
|
||||
+ if( seconds == 0 )
|
||||
+ {
|
||||
+ /* alarm(0) cancelled any previous pending alarm, but the
|
||||
+ handler won't fire, so raise the flag straight away. */
|
||||
+ mbedtls_timing_alarmed = 1;
|
||||
+ }
|
||||
}
|
||||
|
||||
#endif /* _WIN32 && !EFIX64 && !EFI32 */
|
||||
--
|
||||
2.14.3 (Apple Git-98)
|
||||
|
Loading…
Reference in New Issue
Block a user