Fuzz introspector: ssh_sshsig_fuzzer_nalloc
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
223 296 sshsig_verify call site: 00296 ssh_pki_import_signature_blob
53 211 pki_import_pubkey_buffer call site: 00211 pki_pubkey_build_ed25519
18 7 _ssh_log call site: 00007 ssh_vlog
18 173 ssh_pki_import_pubkey_blob call site: 00173 pki_import_cert_buffer
16 268 pki_key_clean call site: 00268 pki_import_pubkey_buffer
6 126 ssh_buffer_unpack_va call site: 00126 _ssh_log
4 100 ssh_buffer_unpack_va call site: 00100 ssh_buffer_get_ssh_string
2 53 ssh_buffer_new call site: 00053 buffer_shift
2 92 ssh_buffer_unpack_va call site: 00092 ssh_buffer_get_u8
2 95 ssh_buffer_get_data call site: 00095 ssh_buffer_get_data
2 133 ssh_buffer_unpack_va call site: 00133 explicit_bzero
2 202 pki_pubkey_build_rsa call site: 00202 EVP_PKEY_free

Fuzzer calltree

0 LLVMFuzzerTestOneInput [function] [call site] 00000
1 nalloc_start [function] [call site] 00001
2 nalloc_random_update [function] [call site] 00002
1 __assert_fail [call site] 00003
1 strncpy [call site] 00004
1 sshsig_verify [function] [call site] 00005
2 _ssh_log [function] [call site] 00006
3 ssh_get_log_level [function] [call site] 00007
3 ssh_vlog [function] [call site] 00008
4 vsnprintf [call site] 00009
4 ssh_log_function [function] [call site] 00010
5 ssh_get_log_callback [function] [call site] 00011
5 ssh_log_custom [function] [call site] 00012
6 snprintf [call site] 00013
6 ssh_get_log_userdata [function] [call site] 00014
5 ssh_log_stderr [function] [call site] 00015
6 current_timestring [function] [call site] 00016
7 gettimeofday [call site] 00017
7 localtime_r [call site] 00018
7 strftime [call site] 00019
7 snprintf [call site] 00020
7 strftime [call site] 00021
7 snprintf [call site] 00022
6 fprintf [call site] 00023
6 fprintf [call site] 00024
6 fprintf [call site] 00025
2 strlen [call site] 00026
2 sshsig_dearmor [function] [call site] 00028
3 strncmp [call site] 00030
3 __ctype_b_loc [call site] 00032
3 strstr [call site] 00033
3 __ctype_b_loc [call site] 00035
3 calloc [function] [call site] 00036
4 nalloc_fail [function] [call site] 00037
5 nalloc_random_update [function] [call site] 00038
5 nalloc_random_update [function] [call site] 00039
5 nalloc_random_update [function] [call site] 00040
5 nalloc_backtrace_exclude [function] [call site] 00041
6 fprintf [call site] 00042
4 __errno_location [call site] 00043
4 __libc_calloc [call site] 00044
3 __ctype_b_loc [call site] 00046
3 base64_to_bin [function] [call site] 00047
4 strdup [call site] 00048
4 get_equals [function] [call site] 00049
5 strchr [call site] 00050
4 ssh_buffer_new [function] [call site] 00051
5 ssh_buffer_allocate_size [function] [call site] 00053
6 buffer_shift [function] [call site] 00054
7 explicit_bzero [call site] 00055
6 realloc_buffer [function] [call site] 00056
7 explicit_bzero [call site] 00057
7 realloc [function] [call site] 00058
8 nalloc_fail [function] [call site] 00059
8 __errno_location [call site] 00060
8 __libc_realloc [call site] 00061
4 ssh_buffer_set_secure [function] [call site] 00062
4 strlen [call site] 00063
4 _base64_to_bin [function] [call site] 00064
5 to_block4 [function] [call site] 00065
6 strchr [call site] 00066
6 strchr [call site] 00067
6 strchr [call site] 00068
6 strchr [call site] 00069
4 ssh_buffer_add_data [function] [call site] 00070
5 buffer_shift [function] [call site] 00071
5 realloc_buffer [function] [call site] 00072
4 _base64_to_bin [function] [call site] 00073
4 ssh_buffer_add_data [function] [call site] 00074
4 _base64_to_bin [function] [call site] 00075
4 ssh_buffer_add_data [function] [call site] 00076
4 _base64_to_bin [function] [call site] 00077
4 ssh_buffer_add_data [function] [call site] 00078
4 ssh_buffer_free [function] [call site] 00079
5 explicit_bzero [call site] 00080
5 explicit_bzero [call site] 00081
2 ssh_buffer_get_len [function] [call site] 00084
2 ssh_buffer_get [function] [call site] 00085
2 memcmp [call site] 00086
2 ssh_buffer_free [function] [call site] 00088
2 ssh_buffer_pass_bytes [function] [call site] 00089
2 _ssh_buffer_unpack [function] [call site] 00090
3 ssh_buffer_unpack_va [function] [call site] 00091
4 ssh_buffer_get_len [function] [call site] 00092
4 ssh_buffer_get_u8 [function] [call site] 00093
5 ssh_buffer_get_data [function] [call site] 00094
6 ssh_buffer_validate_length [function] [call site] 00095
4 ssh_buffer_get_data [function] [call site] 00096
4 ntohs [call site] 00097
4 ssh_buffer_get_u32 [function] [call site] 00098
5 ssh_buffer_get_data [function] [call site] 00099
4 ntohl [call site] 00100
4 ssh_buffer_get_u64 [function] [call site] 00101
5 ssh_buffer_get_data [function] [call site] 00102
4 ntohl [call site] 00103
4 ssh_buffer_get_ssh_string [function] [call site] 00104
5 ssh_buffer_get_u32 [function] [call site] 00105
5 ntohl [call site] 00106
5 ssh_buffer_validate_length [function] [call site] 00107
5 ssh_string_new [function] [call site] 00108
6 __errno_location [call site] 00109
6 htonl [call site] 00110
5 ssh_string_data [function] [call site] 00111
5 ssh_buffer_get_data [function] [call site] 00112
4 ssh_make_string_bn [function] [call site] 00113
5 ssh_string_len [function] [call site] 00114
6 ntohl [call site] 00115
5 BN_new [call site] 00116
5 BN_bin2bn [call site] 00117
4 ssh_string_burn [function] [call site] 00118
5 ssh_string_len [function] [call site] 00119
5 explicit_bzero [call site] 00120
4 ssh_string_free [function] [call site] 00121
4 ssh_buffer_get_ssh_string [function] [call site] 00122
4 ssh_buffer_get_u32 [function] [call site] 00123
4 ntohl [call site] 00124
4 ssh_buffer_validate_length [function] [call site] 00125
4 ssh_buffer_get_data [function] [call site] 00126
4 ssh_buffer_validate_length [function] [call site] 00127
4 ssh_buffer_get_data [function] [call site] 00128
4 abort [call site] 00130
4 explicit_bzero [call site] 00131
4 explicit_bzero [call site] 00132
4 explicit_bzero [call site] 00133
4 explicit_bzero [call site] 00134
4 BN_clear_free [call site] 00135
4 ssh_string_burn [function] [call site] 00136
4 strlen [call site] 00137
4 explicit_bzero [call site] 00138
4 explicit_bzero [call site] 00139
2 ssh_buffer_free [function] [call site] 00141
2 ssh_pki_import_pubkey_blob [function] [call site] 00143
3 ssh_buffer_new [function] [call site] 00144
3 ssh_string_data [function] [call site] 00146
3 ssh_string_len [function] [call site] 00147
3 ssh_buffer_add_data [function] [call site] 00148
3 ssh_buffer_get_ssh_string [function] [call site] 00150
3 ssh_string_get_char [function] [call site] 00152
4 ssh_string_len [function] [call site] 00153
3 ssh_key_type_from_name [function] [call site] 00154
4 strcmp [call site] 00155
4 strcmp [call site] 00156
4 strcmp [call site] 00157
4 strcmp [call site] 00158
4 strcmp [call site] 00159
4 strcmp [call site] 00160
4 strcmp [call site] 00161
4 strcmp [call site] 00162
4 strcmp [call site] 00163
4 strcmp [call site] 00164
4 strcmp [call site] 00165
4 strcmp [call site] 00166
4 strcmp [call site] 00167
4 strcmp [call site] 00168
4 strcmp [call site] 00169
4 strcmp [call site] 00170
4 strcmp [call site] 00171
3 ssh_string_free [function] [call site] 00173
3 pki_import_cert_buffer [function] [call site] 00174
4 ssh_buffer_new [function] [call site] 00175
4 ssh_key_type_to_char [function] [call site] 00176
4 ssh_string_from_char [function] [call site] 00177
5 __errno_location [call site] 00178
5 strlen [call site] 00179
5 ssh_string_new [function] [call site] 00180
4 ssh_buffer_add_ssh_string [function] [call site] 00181
5 ssh_string_len [function] [call site] 00182
5 ssh_buffer_add_data [function] [call site] 00183
4 ssh_string_free [function] [call site] 00184
4 ssh_buffer_add_buffer [function] [call site] 00185
5 ssh_buffer_get [function] [call site] 00186
5 ssh_buffer_get_len [function] [call site] 00187
5 ssh_buffer_add_data [function] [call site] 00188
4 ssh_buffer_get_ssh_string [function] [call site] 00189
4 ssh_string_free [function] [call site] 00190
4 pki_import_pubkey_buffer [function] [call site] 00191
5 ssh_key_new [function] [call site] 00192
5 ssh_key_type_to_char [function] [call site] 00193
5 _ssh_buffer_unpack [function] [call site] 00194
5 pki_pubkey_build_rsa [function] [call site] 00196
6 RSA_new [call site] 00197
6 ssh_make_string_bn [function] [call site] 00198
6 ssh_make_string_bn [function] [call site] 00199
6 RSA_set0_key [call site] 00200
6 EVP_PKEY_new [call site] 00201
6 EVP_PKEY_assign [call site] 00202
6 EVP_PKEY_free [call site] 00203
6 RSA_free [call site] 00204
5 ssh_string_burn [function] [call site] 00205
5 ssh_string_free [function] [call site] 00206
5 ssh_string_burn [function] [call site] 00207
5 ssh_string_free [function] [call site] 00208
5 _ssh_buffer_unpack [function] [call site] 00210
5 ssh_string_get_char [function] [call site] 00212
5 pki_key_ecdsa_nid_from_name [function] [call site] 00213
6 strcmp [call site] 00214
6 strcmp [call site] 00215
6 strcmp [call site] 00216
5 ssh_string_free [function] [call site] 00217
5 ssh_string_burn [function] [call site] 00218
5 ssh_string_free [function] [call site] 00219
5 pki_pubkey_build_ecdsa [function] [call site] 00220
6 EC_KEY_new_by_curve_name [call site] 00221
6 EC_KEY_get0_group [call site] 00222
6 EC_POINT_new [call site] 00223
6 EC_KEY_free [call site] 00224
6 ssh_string_data [function] [call site] 00225
6 ssh_string_len [function] [call site] 00226
6 EC_POINT_oct2point [call site] 00227
6 EC_KEY_free [call site] 00228
6 EC_POINT_free [call site] 00229
6 EC_KEY_set_public_key [call site] 00230
6 EC_POINT_free [call site] 00231
6 EC_KEY_free [call site] 00232
6 EVP_PKEY_new [call site] 00233
6 EC_KEY_free [call site] 00234
6 EVP_PKEY_assign [call site] 00235
6 EC_KEY_free [call site] 00236
5 ssh_string_burn [function] [call site] 00237
5 ssh_string_free [function] [call site] 00238
5 ssh_buffer_get_ssh_string [function] [call site] 00240
5 ssh_key_type_to_char [function] [call site] 00242
5 ssh_buffer_get_ssh_string [function] [call site] 00243
5 ssh_string_len [function] [call site] 00244
5 ssh_string_burn [function] [call site] 00246
5 ssh_string_free [function] [call site] 00247
5 pki_pubkey_build_ed25519 [function] [call site] 00248
6 ssh_string_len [function] [call site] 00249
6 FIPS_mode [call site] 00251
6 ssh_string_data [function] [call site] 00253
6 ssh_string_data [function] [call site] 00254
6 EVP_PKEY_new_raw_public_key [call site] 00255
6 ERR_get_error [call site] 00256
6 ERR_error_string [call site] 00257
5 ssh_string_burn [function] [call site] 00259
5 ssh_string_free [function] [call site] 00260
5 ssh_buffer_get_ssh_string [function] [call site] 00262
5 ssh_key_free [function] [call site] 00265
6 ssh_key_clean [function] [call site] 00266
7 pki_key_clean [function] [call site] 00267
8 EVP_PKEY_free [call site] 00268
7 ssh_buffer_free [function] [call site] 00269
7 ssh_string_burn [function] [call site] 00270
7 ssh_string_free [function] [call site] 00271
7 ssh_string_burn [function] [call site] 00272
7 ssh_string_free [function] [call site] 00273
7 ssh_string_burn [function] [call site] 00274
7 ssh_string_free [function] [call site] 00275
4 pki_import_pubkey_buffer [function] [call site] 00276
4 pki_import_pubkey_buffer [function] [call site] 00277
4 pki_import_pubkey_buffer [function] [call site] 00278
4 pki_import_pubkey_buffer [function] [call site] 00279
4 pki_import_pubkey_buffer [function] [call site] 00280
4 pki_import_pubkey_buffer [function] [call site] 00281
4 ssh_key_new [function] [call site] 00282
4 ssh_key_free [function] [call site] 00283
4 ssh_buffer_free [function] [call site] 00284
3 pki_import_pubkey_buffer [function] [call site] 00285
3 ssh_buffer_free [function] [call site] 00286
3 ssh_buffer_free [function] [call site] 00287
3 ssh_string_free [function] [call site] 00288
2 ssh_string_len [function] [call site] 00290
2 strlen [call site] 00291
2 ssh_string_data [function] [call site] 00292
2 strlen [call site] 00293
2 memcmp [call site] 00294
2 ssh_string_get_char [function] [call site] 00295
2 strcmp [call site] 00297
2 strcmp [call site] 00298
2 sshsig_prepare_data [function] [call site] 00300
3 strcmp [call site] 00302
3 sha256 [function] [call site] 00303
4 sha256_init [function] [call site] 00304
5 EVP_MD_CTX_new [call site] 00305
5 EVP_sha256 [call site] 00306
5 EVP_DigestInit_ex [call site] 00307
5 EVP_MD_CTX_free [call site] 00308
4 sha256_update [function] [call site] 00309
5 EVP_DigestUpdate [call site] 00310
4 EVP_MD_CTX_free [call site] 00311
4 sha256_final [function] [call site] 00312
5 EVP_DigestFinal [call site] 00313
5 EVP_MD_CTX_free [call site] 00314
3 strcmp [call site] 00315
3 sha512 [function] [call site] 00316
4 sha512_init [function] [call site] 00317
5 EVP_MD_CTX_new [call site] 00318
5 EVP_sha512 [call site] 00319
5 EVP_DigestInit_ex [call site] 00320
5 EVP_MD_CTX_free [call site] 00321
4 sha512_update [function] [call site] 00322
5 EVP_DigestUpdate [call site] 00323
4 EVP_MD_CTX_free [call site] 00324
4 sha512_final [function] [call site] 00325
5 EVP_DigestFinal [call site] 00326
5 EVP_MD_CTX_free [call site] 00327
3 ssh_string_new [function] [call site] 00330
3 ssh_string_fill [function] [call site] 00332
4 ssh_string_len [function] [call site] 00333
3 ssh_buffer_new [function] [call site] 00335
3 _ssh_buffer_pack [function] [call site] 00337
4 ssh_buffer_pack_allocate_va [function] [call site] 00338
5 ssh_string_len [function] [call site] 00339
5 strlen [call site] 00340
5 BN_num_bits [call site] 00341
5 strlen [call site] 00342
5 abort [call site] 00344
5 ssh_buffer_allocate_size [function] [call site] 00345
4 ssh_buffer_pack_va [function] [call site] 00346
5 ssh_buffer_add_u8 [function] [call site] 00347
6 ssh_buffer_add_data [function] [call site] 00348
5 htons [call site] 00349
5 ssh_buffer_add_u16 [function] [call site] 00350
6 ssh_buffer_add_data [function] [call site] 00351
5 htonl [call site] 00352
5 ssh_buffer_add_u32 [function] [call site] 00353
6 ssh_buffer_add_data [function] [call site] 00354
5 htonl [call site] 00355
5 ssh_buffer_add_u64 [function] [call site] 00356
6 ssh_buffer_add_data [function] [call site] 00357
5 ssh_buffer_add_ssh_string [function] [call site] 00358
5 strlen [call site] 00359
5 htonl [call site] 00360
5 ssh_buffer_add_u32 [function] [call site] 00361
5 ssh_buffer_add_data [function] [call site] 00362
5 ssh_buffer_add_data [function] [call site] 00363
5 ssh_make_padded_bignum_string [function] [call site] 00364
6 make_bignum_string [function] [call site] 00365
7 BN_num_bits [call site] 00366
7 BN_num_bits [call site] 00367
7 BN_is_bit_set [call site] 00368
7 ssh_string_new [function] [call site] 00369
7 BN_bn2bin [call site] 00370
5 ssh_make_bignum_string [function] [call site] 00371
6 make_bignum_string [function] [call site] 00372
5 ssh_buffer_add_ssh_string [function] [call site] 00373
5 strlen [call site] 00374
5 ssh_buffer_add_data [function] [call site] 00375
5 abort [call site] 00377
3 ssh_buffer_free [function] [call site] 00379
3 ssh_string_free [function] [call site] 00380
2 ssh_pki_import_signature_blob [function] [call site] 00382
3 ssh_buffer_new [function] [call site] 00383
3 ssh_string_data [function] [call site] 00384
3 ssh_string_len [function] [call site] 00385
3 ssh_buffer_add_data [function] [call site] 00386
3 ssh_buffer_free [function] [call site] 00387
3 ssh_buffer_get_ssh_string [function] [call site] 00388
3 ssh_buffer_free [function] [call site] 00389
3 ssh_string_get_char [function] [call site] 00390
3 ssh_key_type_from_signature_name [function] [call site] 00391
4 strcmp [call site] 00392
4 strcmp [call site] 00393
4 ssh_key_type_from_name [function] [call site] 00394
3 ssh_key_hash_from_name [function] [call site] 00395
4 strcmp [call site] 00396
4 strcmp [call site] 00397
4 strcmp [call site] 00398
4 strcmp [call site] 00399
4 strcmp [call site] 00400
4 strcmp [call site] 00401
4 strcmp [call site] 00402
4 strcmp [call site] 00403
4 strcmp [call site] 00404
3 ssh_string_free [function] [call site] 00406
3 ssh_buffer_get_ssh_string [function] [call site] 00407
3 ssh_buffer_free [function] [call site] 00408
3 _ssh_buffer_unpack [function] [call site] 00409
3 ssh_buffer_free [function] [call site] 00410
3 ssh_string_free [function] [call site] 00411
3 ssh_buffer_free [function] [call site] 00412
3 pki_signature_from_blob [function] [call site] 00413
4 ssh_key_type_plain [function] [call site] 00414
4 ssh_signature_new [function] [call site] 00416
4 ssh_key_signature_to_char [function] [call site] 00418
5 ssh_key_type_to_char [function] [call site] 00419
4 pki_signature_from_rsa_blob [function] [call site] 00420
5 ssh_string_len [function] [call site] 00421
5 EVP_PKEY_get0_RSA [call site] 00422
5 RSA_size [call site] 00424
5 ssh_string_copy [function] [call site] 00426
6 ssh_string_len [function] [call site] 00427
6 ssh_string_new [function] [call site] 00428
5 ssh_string_new [function] [call site] 00430
5 ssh_string_data [function] [call site] 00431
5 ssh_string_data [function] [call site] 00432
5 explicit_bzero [call site] 00433
5 ssh_string_free [function] [call site] 00434
4 pki_signature_from_ed25519_blob [function] [call site] 00435
5 ssh_string_len [function] [call site] 00436
5 ssh_string_copy [function] [call site] 00438
4 pki_signature_from_ecdsa_blob [function] [call site] 00439
5 ssh_buffer_new [function] [call site] 00440
5 ssh_buffer_set_secure [function] [call site] 00441
5 ssh_string_data [function] [call site] 00442
5 ssh_string_len [function] [call site] 00443
5 ssh_buffer_add_data [function] [call site] 00444
5 ssh_buffer_get_ssh_string [function] [call site] 00445
5 ssh_make_string_bn [function] [call site] 00446
5 ssh_string_burn [function] [call site] 00447
5 ssh_string_free [function] [call site] 00448
5 ssh_buffer_get_ssh_string [function] [call site] 00449
5 ssh_buffer_get_len [function] [call site] 00450
5 ssh_buffer_free [function] [call site] 00451
5 ssh_string_burn [function] [call site] 00452
5 ssh_string_free [function] [call site] 00453
5 ssh_make_string_bn [function] [call site] 00455
5 ssh_string_burn [function] [call site] 00456
5 ssh_string_free [function] [call site] 00457
5 ECDSA_SIG_new [call site] 00458
5 ECDSA_SIG_set0 [call site] 00459
5 i2d_ECDSA_SIG [call site] 00460
5 i2d_ECDSA_SIG [call site] 00462
5 ssh_string_new [function] [call site] 00463
5 explicit_bzero [call site] 00464
5 ssh_string_fill [function] [call site] 00465
5 explicit_bzero [call site] 00466
5 explicit_bzero [call site] 00467
5 ECDSA_SIG_free [call site] 00468
5 ssh_buffer_free [function] [call site] 00469
5 BN_clear_free [call site] 00470
5 BN_clear_free [call site] 00471
5 ECDSA_SIG_free [call site] 00472
4 ssh_signature_free [function] [call site] 00474
5 ssh_string_burn [function] [call site] 00475
5 ssh_string_free [function] [call site] 00476
3 ssh_string_free [function] [call site] 00477
2 ssh_buffer_get [function] [call site] 00479
2 ssh_buffer_get_len [function] [call site] 00480
2 pki_verify_data_signature [function] [call site] 00481
3 ssh_key_is_private [function] [call site] 00482
3 pki_key_check_hash_compatible [function] [call site] 00484
4 FIPS_mode [call site] 00486
3 ssh_string_data [function] [call site] 00490
3 ssh_string_len [function] [call site] 00491
3 pki_digest_to_md [function] [call site] 00492
4 EVP_sha256 [call site] 00493
4 EVP_sha384 [call site] 00494
4 EVP_sha512 [call site] 00495
4 EVP_sha1 [call site] 00496
3 pki_key_to_pkey [function] [call site] 00498
4 EVP_PKEY_up_ref [call site] 00500
4 EVP_PKEY_free [call site] 00503
3 EVP_MD_CTX_new [call site] 00504
3 ERR_get_error [call site] 00505
3 ERR_error_string [call site] 00506
3 EVP_DigestVerifyInit [call site] 00508
3 ERR_get_error [call site] 00509
3 ERR_error_string [call site] 00510
3 EVP_DigestVerify [call site] 00512
3 ERR_get_error [call site] 00513
3 ERR_error_string [call site] 00514
3 EVP_MD_CTX_free [call site] 00517
3 EVP_PKEY_free [call site] 00518
2 ssh_string_free [function] [call site] 00520
2 ssh_string_free [function] [call site] 00521
2 ssh_string_free [function] [call site] 00522
2 ssh_string_free [function] [call site] 00523
2 ssh_buffer_free [function] [call site] 00524
2 ssh_buffer_free [function] [call site] 00525
2 ssh_key_free [function] [call site] 00526
2 ssh_signature_free [function] [call site] 00527
1 ssh_key_free [function] [call site] 00528
1 nalloc_end [function] [call site] 00529