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daandemeyer
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Mar 9, 2026
Fix a typo which causes a segfault when processing a user record
with matchHostname when it's an array instead of a simple string:
$ echo '{"userName":"crashhostarray","perMachine":[{"matchHostname":["host1","host2"],"locked":false}]}' | userdbctl -F -
Segmentation fault (core dumped)
$ coredumpctl info
...
Message: Process 1172301 (userdbctl) of user 1000 dumped core.
Module libz.so.1 from rpm zlib-ng-2.3.3-1.fc43.x86_64
Module libcrypto.so.3 from rpm openssl-3.5.4-2.fc43.x86_64
Stack trace of thread 1172301:
#0 0x00007fded7b3a656 __strcmp_evex (libc.so.6 + 0x159656)
#1 0x00007fded7e95397 per_machine_hostname_match (libsystemd-shared-260.so + 0x295397)
#2 0x00007fded7e955b5 per_machine_match (libsystemd-shared-260.so + 0x2955b5)
#3 0x00007fded7e957c6 dispatch_per_machine (libsystemd-shared-260.so + 0x2957c6)
#4 0x00007fded7e96c97 user_record_load (libsystemd-shared-260.so + 0x296c97)
#5 0x000000000040572d display_user (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x572d)
#6 0x00007fded7ea9727 dispatch_verb (libsystemd-shared-260.so + 0x2a9727)
#7 0x000000000041077c run (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x1077c)
#8 0x00000000004107ce main (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x107ce)
systemd#9 0x00007fded79e45b5 __libc_start_call_main (libc.so.6 + 0x35b5)
systemd#10 0x00007fded79e4668 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x3668)
systemd#11 0x00000000004038d5 _start (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x38d5)
ELF object binary architecture: AMD x86-64
daandemeyer
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Mar 9, 2026
The fido2_hmac_salt/fido2_hmac_credential/recovery_key fields kept
leaking memory as the array itself wasn't deallocated after deallocating
each of its elements data:
$ build-san/userdbctl -F fuzz-corpus-userdb/auth-fido2.json
...
=================================================================
==1292840==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 112 byte(s) in 1 object(s) allocated from:
#0 0x7f56f00e5e4b in realloc.part.0 (/lib64/libasan.so.8+0xe5e4b) (BuildId: 25975f766867e9e604dc5a71a8befeaed3301942)
#1 0x7f56ed869e42 in greedy_realloc ../src/basic/alloc-util.c:65
#2 0x7f56ed7ff5e9 in dispatch_fido2_hmac_salt ../src/shared/user-record.c:836
#3 0x7f56edd73cbc in sd_json_dispatch_full ../src/libsystemd/sd-json/sd-json.c:5204
#4 0x7f56edd745fc in sd_json_dispatch ../src/libsystemd/sd-json/sd-json.c:5276
#5 0x7f56ed80100b in dispatch_privileged ../src/shared/user-record.c:998
#6 0x7f56edd73cbc in sd_json_dispatch_full ../src/libsystemd/sd-json/sd-json.c:5204
#7 0x7f56edd745fc in sd_json_dispatch ../src/libsystemd/sd-json/sd-json.c:5276
#8 0x7f56ed80622c in user_record_load ../src/shared/user-record.c:1697
systemd#9 0x000000408c15 in display_user ../src/userdb/userdbctl.c:447
systemd#10 0x7f56ed83cc9a in dispatch_verb ../src/shared/verbs.c:137
systemd#11 0x00000041df2b in run ../src/userdb/userdbctl.c:1908
systemd#12 0x00000041dfbe in main ../src/userdb/userdbctl.c:1911
systemd#13 0x7f56ec8105b4 in __libc_start_call_main (/lib64/libc.so.6+0x35b4) (BuildId: 2b5beec0fd24fe9c9f43eddfdd5facf0b8a1b805)
systemd#14 0x7f56ec810667 in __libc_start_main@@GLIBC_2.34 (/lib64/libc.so.6+0x3667) (BuildId: 2b5beec0fd24fe9c9f43eddfdd5facf0b8a1b805)
systemd#15 0x000000404a44 in _start (/home/fsumsal/repos/@systemd/systemd/build-san/userdbctl+0x404a44) (BuildId: 19e8b7e7b7038d2cea20bc18a55bea2a9e4406d5)
Direct leak of 64 byte(s) in 1 object(s) allocated from:
#0 0x7f56f00e5e4b in realloc.part.0 (/lib64/libasan.so.8+0xe5e4b) (BuildId: 25975f766867e9e604dc5a71a8befeaed3301942)
#1 0x7f56ed869e42 in greedy_realloc ../src/basic/alloc-util.c:65
#2 0x7f56ed7fe779 in dispatch_fido2_hmac_credential_array ../src/shared/user-record.c:775
#3 0x7f56edd73cbc in sd_json_dispatch_full ../src/libsystemd/sd-json/sd-json.c:5204
#4 0x7f56edd745fc in sd_json_dispatch ../src/libsystemd/sd-json/sd-json.c:5276
#5 0x7f56ed80622c in user_record_load ../src/shared/user-record.c:1697
#6 0x000000408c15 in display_user ../src/userdb/userdbctl.c:447
#7 0x7f56ed83cc9a in dispatch_verb ../src/shared/verbs.c:137
#8 0x00000041df2b in run ../src/userdb/userdbctl.c:1908
systemd#9 0x00000041dfbe in main ../src/userdb/userdbctl.c:1911
systemd#10 0x7f56ec8105b4 in __libc_start_call_main (/lib64/libc.so.6+0x35b4) (BuildId: 2b5beec0fd24fe9c9f43eddfdd5facf0b8a1b805)
systemd#11 0x7f56ec810667 in __libc_start_main@@GLIBC_2.34 (/lib64/libc.so.6+0x3667) (BuildId: 2b5beec0fd24fe9c9f43eddfdd5facf0b8a1b805)
systemd#12 0x000000404a44 in _start (/home/fsumsal/repos/@systemd/systemd/build-san/userdbctl+0x404a44) (BuildId: 19e8b7e7b7038d2cea20bc18a55bea2a9e4406d5)
SUMMARY: AddressSanitizer: 176 byte(s) leaked in 2 allocation(s).
daandemeyer
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that referenced
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Mar 9, 2026
…d#40979) Fix a typo which causes a segfault when processing a user record with `matchHostname` when it's an array instead of a simple string: ``` $ echo '{"userName":"crashhostarray","perMachine":[{"matchHostname":["host1","host2"],"locked":false}]}' | userdbctl -F - Segmentation fault (core dumped) $ coredumpctl info ... Message: Process 1172301 (userdbctl) of user 1000 dumped core. Module libz.so.1 from rpm zlib-ng-2.3.3-1.fc43.x86_64 Module libcrypto.so.3 from rpm openssl-3.5.4-2.fc43.x86_64 Stack trace of thread 1172301: #0 0x00007fded7b3a656 __strcmp_evex (libc.so.6 + 0x159656) #1 0x00007fded7e95397 per_machine_hostname_match (libsystemd-shared-260.so + 0x295397) #2 0x00007fded7e955b5 per_machine_match (libsystemd-shared-260.so + 0x2955b5) #3 0x00007fded7e957c6 dispatch_per_machine (libsystemd-shared-260.so + 0x2957c6) #4 0x00007fded7e96c97 user_record_load (libsystemd-shared-260.so + 0x296c97) #5 0x000000000040572d display_user (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x572d) #6 0x00007fded7ea9727 dispatch_verb (libsystemd-shared-260.so + 0x2a9727) #7 0x000000000041077c run (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x1077c) #8 0x00000000004107ce main (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x107ce) systemd#9 0x00007fded79e45b5 __libc_start_call_main (libc.so.6 + 0x35b5) systemd#10 0x00007fded79e4668 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x3668) systemd#11 0x00000000004038d5 _start (/home/fsumsal/repos/@systemd/systemd/build/userdbctl + 0x38d5) ELF object binary architecture: AMD x86-64 ```
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