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gcrypt segfaults with ecdsa NIST P-384


Hi Justus,

torgure_algorithms currently segfaults built with gcrypt. ecdsa 256p works, 
384p segfaults and 521p hangs.

gcrypt is 1.8.1-3.fc27

Could you please investigate?

Here is the backtrace:

Program received signal SIGSEGV, Segmentation fault.                                  
0x00007ffff6633d5c in jent_memaccess (ec=ec@entry=0x7ffff7fed058, 
loop_cnt=loop_cnt@entry=0) at ./jitterentropy-base.c:274                                                  
274                     *tmpval = (*tmpval + 1) & 0xff;                               
(gdb) bt                                                                              
#0  0x00007ffff6633d5c in jent_memaccess (ec=ec@entry=0x7ffff7fed058, 
loop_cnt=loop_cnt@entry=0) at ./jitterentropy-base.c:274                                              
#1  0x00007ffff6633e8d in jent_measure_jitter (ec=ec@entry=0x7ffff7fed058) at 
/jitterentropy-base.c:341
#2  0x00007ffff663404e in jent_gen_entropy (ec=ec@entry=0x7ffff7fed058) at ./
jitterentropy-base.c:453                                                                       
#3  0x00007ffff66341bc in jent_read_entropy (ec=0x7ffff7fed058, 
data=data@entry=0x7fffffffacc0 "", len=len@entry=18) at ./jitterentropy-
base.c:541                          
#4  0x00007ffff66347d1 in _gcry_rndjent_poll (add=add@entry=0x7ffff662fca0 
<add_randomness>, origin=origin@entry=RANDOM_ORIGIN_EXTRAPOLL, 
length=length@entry=18)           
    at ./rndjent.c:294                     
#5  0x00007ffff66351da in _gcry_rndlinux_gather_random (add=0x7ffff662fca0 
<add_randomness>, origin=RANDOM_ORIGIN_EXTRAPOLL, length=36, level=2) at 
rndlinux.c:180          
#6  0x00007ffff662f8b0 in read_random_source 
(origin=origin@entry=RANDOM_ORIGIN_EXTRAPOLL, length=length@entry=48, 
level=level@entry=2) at random-csprng.c:1299             
#7  0x00007ffff663091a in read_pool (level=2, length=<optimized out>, 
buffer=0x7ffff7fed050 "") at random-csprng.c:996                                                      
#8  _gcry_rngcsprng_randomize (buffer=<optimized out>, length=<optimized out>, 
level=GCRY_VERY_STRONG_RANDOM) at random-csprng.c:542                                        
#9  0x00007ffff662f520 in _gcry_random_bytes_secure (nbytes=nbytes@entry=48, 
level=level@entry=GCRY_VERY_STRONG_RANDOM) at random.c:405                                     
#10 0x00007ffff65934e3 in _gcry_dsa_gen_k (q=0x6a1ff0, 
security_level=security_level@entry=2) at dsa-common.c:57                                                            
#11 0x00007ffff66061bc in nist_generate_key (sk=sk@entry=0x7fffffffb3c0, 
E=E@entry=0x7fffffffb370, ctx=ctx@entry=0x6946c0, flags=0, nbits=384, 
r_x=0x7fffffffb348,          
    r_y=0x7fffffffb350) at ecc.c:177       
#12 0x00007ffff6606a5a in ecc_generate (genparms=<optimized out>, 
r_skey=0x7fffffffb4f8) at ecc.c:602                                                                       
#13 0x00007ffff6588f1f in _gcry_pk_genkey (r_key=r_key@entry=0x7fffffffb4f8, 
s_parms=s_parms@entry=0x6a5440) at pubkey.c:578                                                
#14 0x00007ffff6574c50 in gcry_pk_genkey (r_key=0x7fffffffb4f8, 
s_parms=0x6a5440) at visibility.c:1029                                                                      
#15 0x000000000043ee8c in ssh_client_ecdh_init (session=0x695410) at /home/
asn/workspace/projects/libssh/src/ecdh_gcrypt.c:83                                               
#16 0x00000000004161aa in dh_handshake (session=0x695410) at /home/asn/
workspace/projects/libssh/src/client.c:265                                                           
#17 0x000000000041679b in ssh_client_connection_callback (session=0x695410) at 
/home/asn/workspace/projects/libssh/src/client.c:474                                         
#18 0x000000000041abf1 in ssh_packet_kexinit (session=0x695410, type=20 
'\024', packet=0x69af90, user=0x695410) at /home/asn/workspace/projects/
libssh/src/kex.c:523        
#19 0x00000000004263e3 in ssh_packet_process (session=0x695410, type=20 
'\024') at /home/asn/workspace/projects/libssh/src/packet.c:451                                     
#20 0x0000000000425f06 in ssh_packet_socket_callback (data=0x6a6350, 
receivedlen=1192, user=0x695410) at /home/asn/workspace/projects/libssh/src/
packet.c:332               
#21 0x000000000042f187 in ssh_socket_pollcallback (p=0x6a0200, fd=4, 
revents=1, v_s=0x69f1b0) at /home/asn/workspace/projects/libssh/src/socket.c:
298                       
#22 0x00000000004586aa in ssh_poll_ctx_dopoll (ctx=0x69c110, timeout=9998) at 
/home/asn/workspace/projects/libssh/src/poll.c:632                                            
#23 0x000000000042e4ee in ssh_handle_packets (session=0x695410, timeout=9998) 
at /home/asn/workspace/projects/libssh/src/session.c:641                                      
#24 0x000000000042e5c1 in ssh_handle_packets_termination (session=0x695410, 
timeout=10000, fct=0x4168cf <ssh_connect_termination>, user=0x695410)                           
    at /home/asn/workspace/projects/libssh/src/session.c:703                          
#25 0x0000000000416cf6 in ssh_connect (session=0x695410) at /home/asn/
workspace/projects/libssh/src/client.c:611                                                            
#26 0x000000000040e0cf in test_algorithm (session=0x695410, kex=0x45bab1 
"ecdh-sha2-nistp384", cipher=0x0, hmac=0x0)                                                        
    at /home/asn/workspace/projects/libssh/tests/client/torture_algorithms.c:
110      
#27 0x000000000040e975 in torture_algorithms_ecdh_sha2_nistp384 
(state=0x692150) at /home/asn/workspace/projects/libssh/tests/client/
torture_algorithms.c:355               
#28 0x00007ffff71a4ae9 in cmocka_run_one_test_or_fixture () from /lib64/
libcmocka.so.0                                                                                      
#29 0x00007ffff71a53d1 in _cmocka_run_group_tests () from /lib64/libcmocka.so.
0       
#30 0x000000000040ea52 in torture_run_tests () at /home/asn/workspace/
projects/libssh/tests/client/torture_algorithms.c:471                                                 
---Type <return> to continue, or q <return> to quit---                                
#31 0x0000000000410558 in main (argc=1, argv=0x7fffffffd028) at /home/asn/
workspace/projects/libssh/tests/torture.c:812



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