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Timing self test: print some diagnosis information

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Print some not-very-nice-looking but helpful diagnosis information if
the timing selftest fails. Since the failures tend to be due to heavy
system load that's hard to reproduce, this information is necessary to
understand what's going on.
This commit is contained in:
Gilles Peskine 2017-10-10 20:09:26 +02:00
parent d92f0aa3be
commit 0827d5c07d
1 changed files with 20 additions and 19 deletions
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29
library/timing.c
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@ -388,8 +388,16 @@ static void busy_msleep( unsigned long msec )
#define FAIL do \ #define FAIL do \
{ \ { \
if( verbose != 0 ) \ if( verbose != 0 ) \
mbedtls_printf( "failed\n" ); \ { \
\ mbedtls_printf( "failed at line %d\n", __LINE__ ); \
mbedtls_printf( " cycles=%lu ratio=%lu millisecs=%lu secs=%lu hardfail=%d a=%lu b=%lu\n", \
cycles, ratio, millisecs, secs, hardfail, \
(unsigned long) a, (unsigned long) b ); \
mbedtls_printf( " elapsed(hires)=%lu elapsed(ctx)=%lu status(ctx)=%d\n", \
mbedtls_timing_get_timer( &hires, 0 ), \
mbedtls_timing_get_timer( &ctx.timer, 0 ), \
mbedtls_timing_get_delay( &ctx ) ); \
} \
return( 1 ); \ return( 1 ); \
} while( 0 ) } while( 0 )
@ -401,17 +409,16 @@ static void busy_msleep( unsigned long msec )
*/ */
int mbedtls_timing_self_test( int verbose ) int mbedtls_timing_self_test( int verbose )
{ {
unsigned long cycles, ratio; unsigned long cycles = 0, ratio = 0;
unsigned long millisecs, secs; unsigned long millisecs = 0, secs = 0;
int hardfail; int hardfail = 0;
struct mbedtls_timing_hr_time hires; struct mbedtls_timing_hr_time hires;
uint32_t a, b; uint32_t a = 0, b = 0;
mbedtls_timing_delay_context ctx; mbedtls_timing_delay_context ctx;
if( verbose != 0 ) if( verbose != 0 )
mbedtls_printf( " TIMING tests note: will take some time!\n" ); mbedtls_printf( " TIMING tests note: will take some time!\n" );
if( verbose != 0 ) if( verbose != 0 )
mbedtls_printf( " TIMING test #1 (set_alarm / get_timer): " ); mbedtls_printf( " TIMING test #1 (set_alarm / get_timer): " );
@ -428,12 +435,7 @@ int mbedtls_timing_self_test( int verbose )
/* For some reason on Windows it looks like alarm has an extra delay /* For some reason on Windows it looks like alarm has an extra delay
* (maybe related to creating a new thread). Allow some room here. */ * (maybe related to creating a new thread). Allow some room here. */
if( millisecs < 800 * secs || millisecs > 1200 * secs + 300 ) if( millisecs < 800 * secs || millisecs > 1200 * secs + 300 )
{ FAIL;
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
} }
if( verbose != 0 ) if( verbose != 0 )
@ -482,7 +484,6 @@ int mbedtls_timing_self_test( int verbose )
* On a 4Ghz 32-bit machine the cycle counter wraps about once per second; * On a 4Ghz 32-bit machine the cycle counter wraps about once per second;
* since the whole test is about 10ms, it shouldn't happen twice in a row. * since the whole test is about 10ms, it shouldn't happen twice in a row.
*/ */
hardfail = 0;
hard_test: hard_test:
if( hardfail > 1 ) if( hardfail > 1 )