Fuzz introspector: ssh_known_hosts_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
25 283 pki_import_pubkey_buffer call site: 00283 pki_pubkey_build_ed25519
18 16 _ssh_log call site: 00016 ssh_vlog
13 220 ssh_buffer_unpack_va call site: 00220 _ssh_log
13 343 ssh_key_cmp call site: 00343 ssh_string_cmp
11 201 ssh_buffer_unpack_va call site: 00201 ssh_buffer_get_ssh_string
8 313 ssh_key_clean call site: 00313 pki_import_pubkey_buffer
6 103 hmac_init call site: 00103 EVP_sha256
4 322 pki_import_cert_buffer call site: 00322 pki_import_pubkey_buffer
4 366 pki_key_compare call site: 00366 EC_KEY_get0_private_key
3 234 ssh_buffer_unpack_va call site: 00234 strlen
2 66 ssh_buffer_new call site: 00066 buffer_shift
2 245 pki_pubkey_build_rsa call site: 00245 EVP_PKEY_free

Fuzzer calltree

0 LLVMFuzzerTestOneInput [function] [call site] 00000
1 memchr [call site] 00001
1 getpid [call site] 00002
1 snprintf [call site] 00003
1 fopen [call site] 00004
1 fwrite [call site] 00005
1 fclose [call site] 00006
1 nalloc_start [function] [call site] 00007
2 nalloc_random_update [function] [call site] 00008
1 __assert_fail [call site] 00009
1 ssh_known_hosts_read_entries [function] [call site] 00010
2 fopen [call site] 00011
2 __errno_location [call site] 00012
2 ssh_strerror [function] [call site] 00013
3 __xpg_strerror_r [call site] 00014
2 _ssh_log [function] [call site] 00015
3 ssh_get_log_level [function] [call site] 00016
3 ssh_vlog [function] [call site] 00017
4 vsnprintf [call site] 00018
4 ssh_log_function [function] [call site] 00019
5 ssh_get_log_callback [function] [call site] 00020
5 ssh_log_custom [function] [call site] 00021
6 snprintf [call site] 00022
6 ssh_get_log_userdata [function] [call site] 00023
5 ssh_log_stderr [function] [call site] 00024
6 current_timestring [function] [call site] 00025
7 gettimeofday [call site] 00026
7 localtime_r [call site] 00027
7 strftime [call site] 00028
7 snprintf [call site] 00029
7 strftime [call site] 00030
7 snprintf [call site] 00031
6 fprintf [call site] 00032
6 fprintf [call site] 00033
6 fprintf [call site] 00034
2 ssh_list_new [function] [call site] 00035
2 fclose [call site] 00036
2 known_hosts_read_line [function] [call site] 00037
3 fgets [call site] 00038
3 strlen [call site] 00039
3 feof [call site] 00040
3 __errno_location [call site] 00041
2 strcspn [call site] 00042
2 __ctype_b_loc [call site] 00043
2 ssh_known_hosts_parse_line [function] [call site] 00044
3 strdup [call site] 00045
3 strtok_r [call site] 00046
3 calloc [function] [call site] 00047
4 nalloc_fail [function] [call site] 00048
5 nalloc_random_update [function] [call site] 00049
5 nalloc_random_update [function] [call site] 00050
5 nalloc_random_update [function] [call site] 00051
5 nalloc_backtrace_exclude [function] [call site] 00052
6 fprintf [call site] 00053
4 __errno_location [call site] 00054
4 __libc_calloc [call site] 00055
3 match_hashed_hostname [function] [call site] 00056
4 strncmp [call site] 00057
4 strdup [call site] 00058
4 strchr [call site] 00059
4 base64_to_bin [function] [call site] 00060
5 strdup [call site] 00061
5 get_equals [function] [call site] 00062
6 strchr [call site] 00063
5 ssh_buffer_new [function] [call site] 00064
6 calloc [function] [call site] 00065
6 ssh_buffer_allocate_size [function] [call site] 00066
7 buffer_shift [function] [call site] 00067
8 explicit_bzero [call site] 00068
7 realloc_buffer [function] [call site] 00069
8 explicit_bzero [call site] 00070
8 realloc [function] [call site] 00071
9 nalloc_fail [function] [call site] 00072
9 __errno_location [call site] 00073
9 __libc_realloc [call site] 00074
5 ssh_buffer_set_secure [function] [call site] 00075
5 strlen [call site] 00076
5 _base64_to_bin [function] [call site] 00077
6 to_block4 [function] [call site] 00078
7 strchr [call site] 00079
7 strchr [call site] 00080
7 strchr [call site] 00081
7 strchr [call site] 00082
5 ssh_buffer_add_data [function] [call site] 00083
6 buffer_shift [function] [call site] 00084
6 realloc_buffer [function] [call site] 00085
5 _base64_to_bin [function] [call site] 00086
5 ssh_buffer_add_data [function] [call site] 00087
5 _base64_to_bin [function] [call site] 00088
5 ssh_buffer_add_data [function] [call site] 00089
5 _base64_to_bin [function] [call site] 00090
5 ssh_buffer_add_data [function] [call site] 00091
5 ssh_buffer_free [function] [call site] 00092
6 explicit_bzero [call site] 00093
6 explicit_bzero [call site] 00094
4 base64_to_bin [function] [call site] 00095
4 ssh_buffer_get [function] [call site] 00096
4 ssh_buffer_get_len [function] [call site] 00097
4 hash_hostname [function] [call site] 00098
5 hmac_init [function] [call site] 00099
6 EVP_MD_CTX_new [call site] 00100
6 EVP_PKEY_new_mac_key [call site] 00101
6 EVP_sha1 [call site] 00102
6 EVP_DigestSignInit [call site] 00103
6 EVP_sha256 [call site] 00104
6 EVP_DigestSignInit [call site] 00105
6 EVP_sha512 [call site] 00106
6 EVP_DigestSignInit [call site] 00107
6 EVP_md5 [call site] 00108
6 EVP_DigestSignInit [call site] 00109
6 EVP_PKEY_free [call site] 00110
6 EVP_MD_CTX_free [call site] 00111
5 strlen [call site] 00112
5 hmac_update [function] [call site] 00113
6 EVP_DigestUpdate [call site] 00114
5 hmac_final [function] [call site] 00115
6 EVP_DigestSignFinal [call site] 00116
6 EVP_MD_CTX_free [call site] 00117
4 ssh_buffer_get_len [function] [call site] 00118
4 ssh_buffer_get [function] [call site] 00119
4 memcmp [call site] 00120
4 ssh_buffer_free [function] [call site] 00121
4 ssh_buffer_free [function] [call site] 00122
3 strtok_r [call site] 00123
3 ssh_hostport [function] [call site] 00124
4 strlen [call site] 00125
4 snprintf [call site] 00126
3 strlen [call site] 00127
3 match_hostname [function] [call site] 00128
4 match_pattern_list [function] [call site] 00129
5 __ctype_b_loc [call site] 00130
5 tolower [call site] 00131
5 match_pattern [function] [call site] 00132
6 match_pattern [function] [call site] 00133
7 match_pattern [function] [call site] 00134
3 strlen [call site] 00135
3 match_hostname [function] [call site] 00136
3 strtok_r [call site] 00137
3 strdup [call site] 00138
3 strdup [call site] 00139
3 strtok_r [call site] 00140
3 strdup [call site] 00141
3 strtok_r [call site] 00142
3 ssh_key_type_from_name [function] [call site] 00143
4 strcmp [call site] 00144
4 strcmp [call site] 00145
4 strcmp [call site] 00146
4 strcmp [call site] 00147
4 strcmp [call site] 00148
4 strcmp [call site] 00149
4 strcmp [call site] 00150
4 strcmp [call site] 00151
4 strcmp [call site] 00152
4 strcmp [call site] 00153
4 strcmp [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
3 _ssh_log [function] [call site] 00161
3 strtok_r [call site] 00162
3 ssh_pki_import_pubkey_base64 [function] [call site] 00163
4 base64_to_bin [function] [call site] 00164
4 ssh_buffer_get_ssh_string [function] [call site] 00165
5 ssh_buffer_get_u32 [function] [call site] 00166
6 ssh_buffer_get_data [function] [call site] 00167
7 ssh_buffer_validate_length [function] [call site] 00168
5 ntohl [call site] 00169
5 ssh_buffer_validate_length [function] [call site] 00170
5 ssh_string_new [function] [call site] 00171
6 __errno_location [call site] 00172
6 htonl [call site] 00173
5 ssh_string_data [function] [call site] 00174
5 ssh_buffer_get_data [function] [call site] 00175
4 ssh_buffer_free [function] [call site] 00176
4 ssh_string_free [function] [call site] 00177
4 pki_import_cert_buffer [function] [call site] 00178
5 ssh_buffer_new [function] [call site] 00179
5 ssh_key_type_to_char [function] [call site] 00180
5 ssh_string_from_char [function] [call site] 00181
6 __errno_location [call site] 00182
6 strlen [call site] 00183
6 ssh_string_new [function] [call site] 00184
5 ssh_buffer_add_ssh_string [function] [call site] 00185
6 ssh_string_len [function] [call site] 00186
7 ntohl [call site] 00187
6 ssh_buffer_add_data [function] [call site] 00188
5 ssh_string_free [function] [call site] 00189
5 ssh_buffer_add_buffer [function] [call site] 00190
6 ssh_buffer_get [function] [call site] 00191
6 ssh_buffer_get_len [function] [call site] 00192
6 ssh_buffer_add_data [function] [call site] 00193
5 ssh_buffer_get_ssh_string [function] [call site] 00194
5 ssh_string_free [function] [call site] 00195
5 pki_import_pubkey_buffer [function] [call site] 00196
6 ssh_key_new [function] [call site] 00197
6 ssh_key_type_to_char [function] [call site] 00198
6 _ssh_buffer_unpack [function] [call site] 00199
7 ssh_buffer_unpack_va [function] [call site] 00200
8 ssh_buffer_get_len [function] [call site] 00201
8 ssh_buffer_get_u8 [function] [call site] 00202
9 ssh_buffer_get_data [function] [call site] 00203
8 ssh_buffer_get_data [function] [call site] 00204
8 ntohs [call site] 00205
8 ssh_buffer_get_u32 [function] [call site] 00206
8 ntohl [call site] 00207
8 ssh_buffer_get_u64 [function] [call site] 00208
9 ssh_buffer_get_data [function] [call site] 00209
8 ntohl [call site] 00210
8 ssh_buffer_get_ssh_string [function] [call site] 00211
8 ssh_make_string_bn [function] [call site] 00212
9 ssh_string_len [function] [call site] 00213
9 BN_new [call site] 00214
9 BN_bin2bn [call site] 00215
8 ssh_string_burn [function] [call site] 00216
9 ssh_string_len [function] [call site] 00217
9 explicit_bzero [call site] 00218
8 ssh_string_free [function] [call site] 00219
8 ssh_buffer_get_ssh_string [function] [call site] 00220
8 ssh_buffer_get_u32 [function] [call site] 00221
8 ntohl [call site] 00222
8 ssh_buffer_validate_length [function] [call site] 00223
8 ssh_buffer_get_data [function] [call site] 00224
8 ssh_buffer_validate_length [function] [call site] 00225
8 ssh_buffer_get_data [function] [call site] 00226
8 _ssh_log [function] [call site] 00227
8 abort [call site] 00228
8 explicit_bzero [call site] 00229
8 explicit_bzero [call site] 00230
8 explicit_bzero [call site] 00231
8 explicit_bzero [call site] 00232
8 BN_clear_free [call site] 00233
8 ssh_string_burn [function] [call site] 00234
8 strlen [call site] 00235
8 explicit_bzero [call site] 00236
8 explicit_bzero [call site] 00237
6 _ssh_log [function] [call site] 00238
6 pki_pubkey_build_rsa [function] [call site] 00239
7 RSA_new [call site] 00240
7 ssh_make_string_bn [function] [call site] 00241
7 ssh_make_string_bn [function] [call site] 00242
7 RSA_set0_key [call site] 00243
7 EVP_PKEY_new [call site] 00244
7 EVP_PKEY_assign [call site] 00245
7 EVP_PKEY_free [call site] 00246
7 RSA_free [call site] 00247
6 ssh_string_burn [function] [call site] 00248
6 ssh_string_free [function] [call site] 00249
6 ssh_string_burn [function] [call site] 00250
6 ssh_string_free [function] [call site] 00251
6 _ssh_log [function] [call site] 00252
6 _ssh_buffer_unpack [function] [call site] 00253
6 _ssh_log [function] [call site] 00254
6 ssh_string_get_char [function] [call site] 00255
7 ssh_string_len [function] [call site] 00256
6 pki_key_ecdsa_nid_from_name [function] [call site] 00257
7 strcmp [call site] 00258
7 strcmp [call site] 00259
7 strcmp [call site] 00260
6 ssh_string_free [function] [call site] 00261
6 ssh_string_burn [function] [call site] 00262
6 ssh_string_free [function] [call site] 00263
6 pki_pubkey_build_ecdsa [function] [call site] 00264
7 EC_KEY_new_by_curve_name [call site] 00265
7 EC_KEY_get0_group [call site] 00266
7 EC_POINT_new [call site] 00267
7 EC_KEY_free [call site] 00268
7 ssh_string_data [function] [call site] 00269
7 ssh_string_len [function] [call site] 00270
7 EC_POINT_oct2point [call site] 00271
7 EC_KEY_free [call site] 00272
7 EC_POINT_free [call site] 00273
7 EC_KEY_set_public_key [call site] 00274
7 EC_POINT_free [call site] 00275
7 EC_KEY_free [call site] 00276
7 EVP_PKEY_new [call site] 00277
7 EC_KEY_free [call site] 00278
7 EVP_PKEY_assign [call site] 00279
7 EC_KEY_free [call site] 00280
6 ssh_string_burn [function] [call site] 00281
6 ssh_string_free [function] [call site] 00282
6 _ssh_log [function] [call site] 00283
6 ssh_buffer_get_ssh_string [function] [call site] 00284
6 _ssh_log [function] [call site] 00285
6 ssh_key_type_to_char [function] [call site] 00286
6 ssh_buffer_get_ssh_string [function] [call site] 00287
6 ssh_string_len [function] [call site] 00288
6 _ssh_log [function] [call site] 00289
6 ssh_string_burn [function] [call site] 00290
6 ssh_string_free [function] [call site] 00291
6 pki_pubkey_build_ed25519 [function] [call site] 00292
7 ssh_string_len [function] [call site] 00293
7 _ssh_log [function] [call site] 00294
7 FIPS_mode [call site] 00295
7 _ssh_log [function] [call site] 00296
7 ssh_string_data [function] [call site] 00297
7 ssh_string_data [function] [call site] 00298
7 EVP_PKEY_new_raw_public_key [call site] 00299
7 ERR_get_error [call site] 00300
7 ERR_error_string [call site] 00301
7 _ssh_log [function] [call site] 00302
6 ssh_string_burn [function] [call site] 00303
6 ssh_string_free [function] [call site] 00304
6 _ssh_log [function] [call site] 00305
6 ssh_buffer_get_ssh_string [function] [call site] 00306
6 _ssh_log [function] [call site] 00307
6 _ssh_log [function] [call site] 00308
6 ssh_key_free [function] [call site] 00309
7 ssh_key_clean [function] [call site] 00310
8 pki_key_clean [function] [call site] 00311
9 EVP_PKEY_free [call site] 00312
8 ssh_buffer_free [function] [call site] 00313
8 ssh_string_burn [function] [call site] 00314
8 ssh_string_free [function] [call site] 00315
8 ssh_string_burn [function] [call site] 00316
8 ssh_string_free [function] [call site] 00317
8 ssh_string_burn [function] [call site] 00318
8 ssh_string_free [function] [call site] 00319
5 pki_import_pubkey_buffer [function] [call site] 00320
5 pki_import_pubkey_buffer [function] [call site] 00321
5 pki_import_pubkey_buffer [function] [call site] 00322
5 pki_import_pubkey_buffer [function] [call site] 00323
5 pki_import_pubkey_buffer [function] [call site] 00324
5 pki_import_pubkey_buffer [function] [call site] 00325
5 ssh_key_new [function] [call site] 00326
5 ssh_key_free [function] [call site] 00327
5 ssh_buffer_free [function] [call site] 00328
4 pki_import_pubkey_buffer [function] [call site] 00329
4 ssh_buffer_free [function] [call site] 00330
3 ssh_key_type_to_char [function] [call site] 00331
3 _ssh_log [function] [call site] 00332
3 strtok_r [call site] 00333
3 strstr [call site] 00334
3 strdup [call site] 00335
3 ssh_knownhosts_entry_free [function] [call site] 00336
4 ssh_key_free [function] [call site] 00337
2 ssh_list_get_iterator [function] [call site] 00338
2 ssh_known_hosts_entries_compare [function] [call site] 00339
3 strcmp [call site] 00340
3 ssh_key_cmp [function] [call site] 00341
4 ssh_key_type_plain [function] [call site] 00342
4 _ssh_log [function] [call site] 00343
4 ssh_key_is_private [function] [call site] 00344
4 ssh_key_is_private [function] [call site] 00345
4 ssh_string_cmp [function] [call site] 00346
5 ssh_string_len [function] [call site] 00347
5 ssh_string_len [function] [call site] 00348
5 memcmp [call site] 00349
4 ssh_string_cmp [function] [call site] 00350
4 ssh_string_cmp [function] [call site] 00351
4 ssh_buffer_get_len [function] [call site] 00352
4 ssh_buffer_get [function] [call site] 00353
4 ssh_buffer_get [function] [call site] 00354
4 ssh_buffer_get_len [function] [call site] 00355
4 memcmp [call site] 00356
4 pki_key_compare [function] [call site] 00357
5 ssh_key_type_plain [function] [call site] 00358
5 EVP_PKEY_get0_EC_KEY [call site] 00359
5 EVP_PKEY_get0_EC_KEY [call site] 00360
5 EC_KEY_get0_public_key [call site] 00361
5 EC_KEY_get0_public_key [call site] 00362
5 EC_KEY_get0_group [call site] 00363
5 EC_KEY_get0_group [call site] 00364
5 EC_GROUP_cmp [call site] 00365
5 EC_POINT_cmp [call site] 00366
5 EC_KEY_get0_private_key [call site] 00367
5 BN_cmp [call site] 00368
5 FIPS_mode [call site] 00369
5 memcmp [call site] 00370
5 EVP_PKEY_cmp [call site] 00371
2 ssh_knownhosts_entry_free [function] [call site] 00372
2 ssh_list_append [function] [call site] 00373
3 ssh_iterator_new [function] [call site] 00374
2 known_hosts_read_line [function] [call site] 00375
2 fclose [call site] 00376
2 fclose [call site] 00377
1 ssh_list_get_iterator [function] [call site] 00378
1 ssh_knownhosts_entry_free [function] [call site] 00379
1 ssh_list_remove [function] [call site] 00380
1 ssh_list_get_iterator [function] [call site] 00381
1 ssh_list_free [function] [call site] 00382
1 ssh_finalize [function] [call site] 00383
2 _ssh_finalize [function] [call site] 00384
3 ssh_mutex_lock [function] [call site] 00385
4 exit [call site] 00386
4 pthread_mutex_lock [call site] 00387
4 exit [call site] 00388
3 ssh_mutex_unlock [function] [call site] 00389
4 exit [call site] 00390
4 pthread_mutex_unlock [call site] 00391
4 exit [call site] 00392
3 ssh_mutex_unlock [function] [call site] 00393
3 ssh_dh_finalize [function] [call site] 00394
4 BN_clear_free [call site] 00395
4 BN_clear_free [call site] 00396
4 BN_clear_free [call site] 00397
4 BN_clear_free [call site] 00398
4 BN_clear_free [call site] 00399
3 ssh_crypto_finalize [function] [call site] 00400
3 ssh_socket_cleanup [function] [call site] 00401
4 ssh_poll_cleanup [function] [call site] 00402
3 ssh_threads_finalize [function] [call site] 00403
4 crypto_thread_finalize [function] [call site] 00404
3 ssh_mutex_unlock [function] [call site] 00405
1 unlink [call site] 00406
1 nalloc_end [function] [call site] 00407