around line 700 of certreqgen.c, there are several lines that look something like this:
r = get_parameter (para, pEXTENSION, seq);
log_error (_("line %d: invalid extension syntax\n"), r->lnr);however, get_parameter can return NULL, in which case r->lnr causes a segmentation fault.
This can be replicated with:
printf 'Key-Type: RSA\n' | gpgsm --homedir=$(mktemp -d) --gen-key --batch
for example:
0 dkg@alice:~$ printf 'Key-Type: RSA\n' | gpgsm --homedir=$(mktemp -d) --gen-key --batch gpgsm: keybox '/home/dkg/tmp/tmp.Qk6mhUnfn7/pubring.kbx' created gpgsm: signal Segmentation fault caught ... exiting Segmentation fault 139 dkg@alice:~$