Mercurial > hg
view mercurial/dummycert.pem @ 49000:dd6b67d5c256 stable
rust: fix unsound `OwningDirstateMap`
As per the previous patch, `OwningDirstateMap` is unsound. Self-referential
structs are difficult to implement correctly in Rust since the compiler is
free to move structs around as much as it wants to. They are also very rarely
needed in practice, so the state-of-the-art on how they should be done within
the Rust rules is still a bit new.
The crate `ouroboros` is an attempt at providing a safe way (in the Rust sense)
of declaring self-referential structs. It is getting a lot attention and was
improved very quickly when soundness issues were found in the past: rather than
relying on our own (limited) review circle, we might as well use the de-facto
common crate to fix this problem. This will give us a much better chance of
finding issues should any new ones be discovered as well as the benefit of
fewer `unsafe` APIs of our own.
I was starting to think about how I would present a safe API to the old struct
but soon realized that the callback-based approach was already done in
`ouroboros`, along with a lot more care towards refusing incorrect structs.
In short: we don't return a mutable reference to the `DirstateMap` anymore, we
expect users of its API to pass a `FnOnce` that takes the map as an argument.
This allows our `OwningDirstateMap` to control the input and output lifetimes
of the code that modifies it to prevent such issues.
Changing to `ouroboros` meant changing every API with it, but it is relatively
low churn in the end. It correctly identified the example buggy modification of
`copy_map_insert` outlined in the previous patch as violating the borrow rules.
Differential Revision: https://phab.mercurial-scm.org/D12429
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Tue, 05 Apr 2022 10:55:28 +0200 |
parents | d7f7f1860f00 |
children |
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A dummy certificate that will make OS X 10.6+ Python use the system CA certificate store: -----BEGIN CERTIFICATE----- MIIBIzCBzgIJANjmj39sb3FmMA0GCSqGSIb3DQEBBQUAMBkxFzAVBgNVBAMTDmhn LmV4YW1wbGUuY29tMB4XDTE0MDgzMDA4NDU1OVoXDTE0MDgyOTA4NDU1OVowGTEX MBUGA1UEAxMOaGcuZXhhbXBsZS5jb20wXDANBgkqhkiG9w0BAQEFAANLADBIAkEA mh/ZySGlcq0ALNLmA1gZqt61HruywPrRk6WyrLJRgt+X7OP9FFlEfl2tzHfzqvmK CtSQoPINWOdAJMekBYFgKQIDAQABMA0GCSqGSIb3DQEBBQUAA0EAF9h49LkSqJ6a IlpogZuUHtihXeKZBsiktVIDlDccYsNy0RSh9XxUfhk+XMLw8jBlYvcltSXdJ7We aKdQRekuMQ== -----END CERTIFICATE----- This certificate was generated to be syntactically valid but never be usable; it expired before it became valid. Created as: $ cat > cn.conf << EOT > [req] > distinguished_name = req_distinguished_name > [req_distinguished_name] > commonName = Common Name > commonName_default = no.example.com > EOT $ openssl req -nodes -new -x509 -keyout /dev/null \ > -out dummycert.pem -days -1 -config cn.conf -subj '/CN=hg.example.com' To verify the content of this certificate: $ openssl x509 -in dummycert.pem -noout -text Certificate: Data: Version: 1 (0x0) Serial Number: 15629337334278746470 (0xd8e68f7f6c6f7166) Signature Algorithm: sha1WithRSAEncryption Issuer: CN=hg.example.com Validity Not Before: Aug 30 08:45:59 2014 GMT Not After : Aug 29 08:45:59 2014 GMT Subject: CN=hg.example.com Subject Public Key Info: Public Key Algorithm: rsaEncryption Public-Key: (512 bit) Modulus: 00:9a:1f:d9:c9:21:a5:72:ad:00:2c:d2:e6:03:58: 19:aa:de:b5:1e:bb:b2:c0:fa:d1:93:a5:b2:ac:b2: 51:82:df:97:ec:e3:fd:14:59:44:7e:5d:ad:cc:77: f3:aa:f9:8a:0a:d4:90:a0:f2:0d:58:e7:40:24:c7: a4:05:81:60:29 Exponent: 65537 (0x10001) Signature Algorithm: sha1WithRSAEncryption 17:d8:78:f4:b9:12:a8:9e:9a:22:5a:68:81:9b:94:1e:d8:a1: 5d:e2:99:06:c8:a4:b5:52:03:94:37:1c:62:c3:72:d1:14:a1: f5:7c:54:7e:19:3e:5c:c2:f0:f2:30:65:62:f7:25:b5:25:dd: 27:b5:9e:68:a7:50:45:e9:2e:31