David Bremner <da...@tethera.net> writes:

> Oh, by the way, I think this was reported already in
> id:qf5d17wzq90....@google.com, but we don't have a test case.

Yep. Seems to be the same bug. Added to References.

> So if you have (or can make) a message that triggers these segfaults,
> and that you can share, that would be helpful.

The test suite has such a message already. "signature verification
(notmuch CLI)" test fails with a SIGSEGV when built with gmime-2.6.23.

T355-smime: Testing S/MIME signature verification and decryption
gpgsm: keybox 
'/tmp/nix-build-notmuch-0.25.drv-0/notmuch-test-8789.qe2sRf/gnupg/pubring.kbx' 
created
 PASS   emacs delivery of S/MIME signed message
 PASS   emacs delivery of S/MIME encrypted + signed message
 PASS   Signature verification (openssl)
 FAIL   signature verification (notmuch CLI)
        --- T355-smime.4.expected       2017-08-31 14:57:24.145052329 +0000
        +++ T355-smime.4.output 2017-08-31 14:57:24.145052329 +0000
        @@ -1,56 +1 @@
        -[
        -    [
        -        [
        -            {
        -                "body": [
        -                    {
        -                        "content": [
        -                            {
        -                                "content": "This is a test signed 
message.\n",
        -                                "content-type": "text/plain",
        -                                "id": 2
        -                            },
        -                            {
        -                                "content-disposition": "attachment",
        -                                "content-length": "NONZERO",
        -                                "content-transfer-encoding": "base64",
        -                                "content-type": 
"application/x-pkcs7-signature",
        -                                "filename": "smime.p7s",
        -                                "id": 3
        -                            }
        -                        ],
        -                        "content-type": "multipart/signed",
        -                        "id": 1,
        -                        "sigstatus": [
        -                            {
        -                                "created": 946728000,
        -                                "expires": 424242424,
        -                                "fingerprint": 
"616F46CD73834C63847756AF0DFB64A6E0972A47",
        -                                "status": "good"
        -                            }
        -                        ]
        -                    }
        -                ],
        -                "date_relative": "2000-01-01",
        -                "excluded": false,
        -                "filename": [
        -                    "YYYYY"
        -                ],
        -                "headers": {
        -                    "Date": "Sat, 01 Jan 2000 12:00:00 +0000",
        -                    "From": "Notmuch Test Suite 
<test_su...@notmuchmail.org>",
        -                    "Subject": "test signed message 001",
        -                    "To": "test_su...@notmuchmail.org"
        -                },
        -                "id": "XXXXX",
        -                "match": true,
        -                "tags": [
        -                    "inbox",
        -                    "signed"
        -                ],
        -                "timestamp": 946728000
        -            },
        -            []
        -        ]
        -    ]
        -]
        +
Failed to construct pkcs7 context.
No JSON object could be decoded
 PASS   Decryption and signature verification (openssl)

Cheers,
  Jan
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