[Bug 1778770] Re: GnuPG segfaults when encrypting mail to key with ed25519 / cv25519 subkeys

[Moritz Naumann]

Affects multiple users (as per the comments).

** Changed in: gnupg2 (Ubuntu)
       Status: New => Confirmed

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Title:
  GnuPG segfaults when encrypting mail to key with ed25519 / cv25519
  subkeys

Status in gnupg2 package in Ubuntu:
  Confirmed

Bug description:
  Trying to encrypt an e-mail (suing a local RSA/RSA key pair) to a
  recipient who combines an RSA public key with RSA and ed25519 (both
  "usage: S", not expired) as well as a cv25519 (usage: E, not expired)
  subkey.

  Just running gpg2 --edit-key with the recipients' key prints:
  ...
  sub  ed25519/[KEYID_REMOVED]
       created: [DATE_REMOVED]  expires: [DATE_REMOVED]  usage: S   
  gpg: error computing keygrip
  gpg: error computing a keygrip: General error
  sub  cv25519/[KEYID_REMOVED]
       created: [DATE_REMOVED]  expires: [DATE_REMOVED]  usage: E   
  ...

  ...but at least does not segfault, yet.

  However,

  $ /usr/bin/gpg2 --charset utf-8 --display-charset utf-8 --batch --no-
  tty --no-verbose --status-fd 2 --digest-algo sha512 -a -t --encrypt
  --sign --trust-model always --encrypt-to MY_RSA_KEY -r RECIPIENTS_KEY
  -u MY_RSA_KEY

  also reports:

  gpg: error computing keygrip
  gpg: error computing a keygrip: General error

  and finally segfaults, reproducibly.

  
  Backtrace:

  Program received signal SIGABRT, Aborted.
  0x00007ffff69f5428 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
  54	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
  (gdb) bt
  #0  0x00007ffff69f5428 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
  #1  0x00007ffff69f702a in __GI_abort () at abort.c:89
  #2  0x00005555555e68be in do_logv (level=level at entry=6, ignore_arg_ptr=ignore_arg_ptr at entry=0, fmt=fmt at entry=0x5555556171f8 "pop_filter(): filter function not found\n", arg_ptr=arg_ptr at entry=0x7fffffffbde0)
      at logging.c:737
  #3  0x00005555555e77e3 in log_bug (fmt=fmt at entry=0x5555556171f8 "pop_filter(): filter function not found\n") at logging.c:825
  #4  0x00005555555f06ee in pop_filter (a=a at entry=0x555555859cb0, f=f at entry=0x5555555f1ce0 <block_filter>, ov=0x0) at iobuf.c:1719
  #5  0x00005555555f2b8d in iobuf_set_partial_block_mode (a=a at entry=0x555555859cb0, len=len at entry=0) at iobuf.c:2534
  #6  0x000055555556a93c in do_plaintext (out=out at entry=0x555555859cb0, ctb=ctb at entry=203, pt=pt at entry=0x555555866280) at build-packet.c:554
  #7  0x000055555556aded in build_packet (out=out at entry=0x555555859cb0, pkt=pkt at entry=0x7fffffffc3c0) at build-packet.c:127
  #8  0x000055555559f40c in write_plaintext_packet (out=0x555555859cb0, inp=inp at entry=0x555555996ea0, fname=fname at entry=0x0, ptmode=116) at sign.c:614
  #9  0x00005555555a0bd0 in sign_file (ctrl=<optimized out>, filenames=<optimized out>, detached=0, locusr=<optimized out>, encryptflag=1, remusr=<optimized out>, outfile=0x0) at sign.c:1021
  #10 0x0000555555566c47 in main (argc=0, argv=0x7fffffffdcc0) at gpg.c:3886

  This is GnuPG 2.1.11-6ubuntu2.1 with libgcrypt20 1.6.5-2ubuntu0.5
  (standard package versions, fully updated) on 16.04.4 amd64.

  I guess lack of support for such keys in 16.04 could be acceptable,
  but  it should not just fail so miserably.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: gnupg2 2.1.11-6ubuntu2.1
  ProcVersionSignature: Ubuntu 4.15.0-23.25~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Tue Jun 26 19:12:31 2018
  InstallationDate: Installed on 2017-04-29 (422 days ago)
  InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.8)
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnupg2
  UpgradeStatus: No upgrade log present (probably fresh install)

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