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Merge pull request #3352 from gilles-peskine-arm/fix-ecp-mul-memory-leak-2.16

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Backport 2.16: Fix potential memory leak in EC multiplication
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Manuel Pégourié-Gonnard 2020-06-05 11:44:02 +02:00 committed by GitHub
commit 62b293df5b
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 44 additions and 2 deletions
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3
ChangeLog.d/fix-ecp-mul-memory-leak.txt Normal file
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@ -0,0 +1,3 @@
Bugfix
* Fix potential memory leaks in ecp_randomize_jac() and ecp_randomize_mxz()
when PRNG function fails. Contributed by Jonas Lejeune in #3318.

10
library/ecp.c
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@ -1466,7 +1466,10 @@ static int ecp_randomize_jac( const mbedtls_ecp_group *grp, mbedtls_ecp_point *p
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &l, 1 ) );
if( count++ > 10 )
return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
{
ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
goto cleanup;
}
}
while( mbedtls_mpi_cmp_int( &l, 1 ) <= 0 );
@ -2198,7 +2201,10 @@ static int ecp_randomize_mxz( const mbedtls_ecp_group *grp, mbedtls_ecp_point *P
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &l, 1 ) );
if( count++ > 10 )
return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
{
ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
goto cleanup;
}
}
while( mbedtls_mpi_cmp_int( &l, 1 ) <= 0 );

8
tests/suites/test_suite_ecp.data
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@ -336,6 +336,14 @@ ECP test vectors Curve448 (RFC 7748 6.2, after decodeUCoordinate)
depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
ecp_test_vec_x:MBEDTLS_ECP_DP_CURVE448:"eb7298a5c0d8c29a1dab27f1a6826300917389449741a974f5bac9d98dc298d46555bce8bae89eeed400584bb046cf75579f51d125498f98":"a01fc432e5807f17530d1288da125b0cd453d941726436c8bbd9c5222c3da7fa639ce03db8d23b274a0721a1aed5227de6e3b731ccf7089b":"ad997351b6106f36b0d1091b929c4c37213e0d2b97e85ebb20c127691d0dad8f1d8175b0723745e639a3cb7044290b99e0e2a0c27a6a301c":"0936f37bc6c1bd07ae3dec7ab5dc06a73ca13242fb343efc72b9d82730b445f3d4b0bd077162a46dcfec6f9b590bfcbcf520cdb029a8b73e":"9d874a5137509a449ad5853040241c5236395435c36424fd560b0cb62b281d285275a740ce32a22dd1740f4aa9161cec95ccc61a18f4ff07"
ECP point multiplication rng fail secp256r1
depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
ecp_test_mul_rng:MBEDTLS_ECP_DP_SECP256R1:"814264145F2F56F2E96A8E337A1284993FAF432A5ABCE59E867B7291D507A3AF"
ECP point multiplication rng fail Curve25519
depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
ecp_test_mul_rng:MBEDTLS_ECP_DP_CURVE25519:"5AC99F33632E5A768DE7E81BF854C27C46E3FBF2ABBACD29EC4AFF517369C660"
ECP test vectors secp192k1
depends_on:MBEDTLS_ECP_DP_SECP192K1_ENABLED
ecp_test_vect:MBEDTLS_ECP_DP_SECP192K1:"D1E13A359F6E0F0698791938E6D60246030AE4B0D8D4E9DE":"281BCA982F187ED30AD5E088461EBE0A5FADBB682546DF79":"3F68A8E9441FB93A4DD48CB70B504FCC9AA01902EF5BE0F3":"BE97C5D2A1A94D081E3FACE53E65A27108B7467BDF58DE43":"5EB35E922CD693F7947124F5920022C4891C04F6A8B8DCB2":"60ECF73D0FC43E0C42E8E155FFE39F9F0B531F87B34B6C3C":"372F5C5D0E18313C82AEF940EC3AFEE26087A46F1EBAE923":"D5A9F9182EC09CEAEA5F57EA10225EC77FA44174511985FD"

25
tests/suites/test_suite_ecp.function
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@ -674,6 +674,31 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void ecp_test_mul_rng( int id, data_t * d_hex)
{
mbedtls_ecp_group grp;
mbedtls_mpi d;
mbedtls_ecp_point Q;
mbedtls_ecp_group_init( &grp ); mbedtls_mpi_init( &d );
mbedtls_ecp_point_init( &Q );
TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );
TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &grp.G ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &d, d_hex->x, d_hex->len ) == 0 );
TEST_ASSERT( mbedtls_ecp_mul( &grp, &Q, &d, &grp.G, &rnd_zero_rand, NULL )
== MBEDTLS_ERR_ECP_RANDOM_FAILED );
exit:
mbedtls_ecp_group_free( &grp ); mbedtls_mpi_free( &d );
mbedtls_ecp_point_free( &Q );
}
/* END_CASE */
/* BEGIN_CASE */
void ecp_fast_mod( int id, char * N_str )
{