[Bug 1949723] Re: systemd-resolved segfault in hashmap_iterate_entry

[Nick Rosbrook]

The mentioned fix in the upstream report has been in systemd since 2021.

** Also affects: systemd (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu)
       Status: New => Fix Released

** Changed in: systemd (Ubuntu Focal)
   Importance: Undecided => Low

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Title:
  systemd-resolved segfault in hashmap_iterate_entry

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  New

Bug description:
  installed libnss-resolve that put "resolve" in nsswitch.conf.

  $ lsb_release -rd
  Description:	Ubuntu 20.04.3 LTS
  Release:	20.04
  $ dpkg -l systemd | grep systemd
  ii  systemd        245.4-4ubuntu3.13 amd64        system and service manager
  $ grep ^hosts /etc/nsswitch.conf 
  hosts:          files libvirt mdns4_minimal resolve [NOTFOUND=return] dns mymachines

  systemd-resolved crashed once with segmentation fault.


  (gdb) bt
  #0  0x00007f119c67693a in hashmap_iterate_entry (h=h at entry=0x706f746b73656465, i=i at entry=0x7ffc4ef515d0) at ../src/basic/hashmap.c:705
  #1  0x00007f119c6789d6 in internal_hashmap_iterate (h=0x706f746b73656465, i=i at entry=0x7ffc4ef515d0, value=value at entry=0x7ffc4ef515c8, key=key at entry=0x0)
      at ../src/basic/hashmap.c:714
  #2  0x00007f119c678a8b in set_iterate (s=<optimised out>, i=i at entry=0x7ffc4ef515d0, value=value at entry=0x7ffc4ef515c8) at ../src/basic/hashmap.c:735
  #3  0x000055ba5e0ea917 in dns_query_candidate_go (c=c at entry=0x55ba5f353180) at ../src/resolve/resolved-dns-query.c:152
  #4  0x000055ba5e0e9f0c in dns_query_candidate_notify (c=c at entry=0x55ba5f353180) at ../src/resolve/resolved-dns-query.c:312
  #5  0x000055ba5e0ea178 in dns_transaction_complete (t=0x55ba5f37a9d0, state=<optimised out>) at ../src/resolve/resolved-dns-transaction.c:351
  #6  0x000055ba5e0e27cd in dns_transaction_process_dnssec (t=t at entry=0x55ba5f37a9d0) at ../src/resolve/resolved-dns-transaction.c:838
  #7  0x000055ba5e0e3649 in dns_transaction_process_reply (t=t at entry=0x55ba5f37a9d0, p=p at entry=0x55ba5f39dce0)
      at ../src/resolve/resolved-dns-transaction.c:1210
  #8  0x000055ba5e0e40ab in on_dns_packet (s=<optimised out>, fd=<optimised out>, revents=<optimised out>, userdata=0x55ba5f37a9d0)
      at ../src/resolve/resolved-dns-transaction.c:1264
  #9  0x00007f119c5e6c77 in source_dispatch (s=s at entry=0x55ba5f346780) at ../src/libsystemd/sd-event/sd-event.c:3193
  #10 0x00007f119c5e6f11 in sd_event_dispatch (e=e at entry=0x55ba5f320430) at ../src/libsystemd/sd-event/sd-event.c:3634
  #11 0x00007f119c5e8948 in sd_event_run (e=e at entry=0x55ba5f320430, timeout=timeout at entry=18446744073709551615) at ../src/libsystemd/sd-event/sd-event.c:3692
  #12 0x00007f119c5e8b6f in sd_event_loop (e=0x55ba5f320430) at ../src/libsystemd/sd-event/sd-event.c:3714
  #13 0x000055ba5e0c326a in run (argv=<optimised out>, argc=<optimised out>) at ../src/resolve/resolved.c:84
  #14 main (argc=<optimised out>, argv=<optimised out>) at ../src/resolve/resolved.c:91

  This seems to have been reported upstream
  https://github.com/systemd/systemd/issues/16168

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