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| 1 | +Bitcoin Core version 0.11.1 is now available from: |
| 2 | + |
| 3 | + <https://bitcoin.org/bin/bitcoin-core-0.11.1/> |
| 4 | + |
| 5 | +This is a new minor version release, bringing security fixes. It is recommended |
| 6 | +to upgrade to this version as soon as possible. |
| 7 | + |
| 8 | +Please report bugs using the issue tracker at github: |
| 9 | + |
| 10 | + <https://github.com/bitcoin/bitcoin/issues> |
| 11 | + |
| 12 | +Upgrading and downgrading |
| 13 | +========================= |
| 14 | + |
| 15 | +How to Upgrade |
| 16 | +-------------- |
| 17 | + |
| 18 | +If you are running an older version, shut it down. Wait until it has completely |
| 19 | +shut down (which might take a few minutes for older versions), then run the |
| 20 | +installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or |
| 21 | +bitcoind/bitcoin-qt (on Linux). |
| 22 | + |
| 23 | +Downgrade warning |
| 24 | +------------------ |
| 25 | + |
| 26 | +Because release 0.10.0 and later makes use of headers-first synchronization and |
| 27 | +parallel block download (see further), the block files and databases are not |
| 28 | +backwards-compatible with pre-0.10 versions of Bitcoin Core or other software: |
| 29 | + |
| 30 | +* Blocks will be stored on disk out of order (in the order they are |
| 31 | +received, really), which makes it incompatible with some tools or |
| 32 | +other programs. Reindexing using earlier versions will also not work |
| 33 | +anymore as a result of this. |
| 34 | + |
| 35 | +* The block index database will now hold headers for which no block is |
| 36 | +stored on disk, which earlier versions won't support. |
| 37 | + |
| 38 | +If you want to be able to downgrade smoothly, make a backup of your entire data |
| 39 | +directory. Without this your node will need start syncing (or importing from |
| 40 | +bootstrap.dat) anew afterwards. It is possible that the data from a completely |
| 41 | +synchronised 0.10 node may be usable in older versions as-is, but this is not |
| 42 | +supported and may break as soon as the older version attempts to reindex. |
| 43 | + |
| 44 | +This does not affect wallet forward or backward compatibility. There are no |
| 45 | +known problems when downgrading from 0.11.x to 0.10.x. |
| 46 | + |
| 47 | +Notable changes |
| 48 | +=============== |
| 49 | + |
| 50 | +Fix buffer overflow in bundled upnp |
| 51 | +------------------------------------ |
| 52 | + |
| 53 | +Bundled miniupnpc was updated to 1.9.20151008. This fixes a buffer overflow in |
| 54 | +the XML parser during initial network discovery. |
| 55 | + |
| 56 | +Details can be found here: http://talosintel.com/reports/TALOS-2015-0035/ |
| 57 | + |
| 58 | +This applies to the distributed executables only, not when building from source or |
| 59 | +using distribution provided packages. |
| 60 | + |
| 61 | +Additionally, upnp has been disabled by default. This may result in a lower |
| 62 | +number of reachable nodes on IPv4, however this prevents future libupnpc |
| 63 | +vulnerabilities from being a structural risk to the network |
| 64 | +(see https://github.com/bitcoin/bitcoin/pull/6795). |
| 65 | + |
| 66 | +Test for LowS signatures before relaying |
| 67 | +----------------------------------------- |
| 68 | + |
| 69 | +Make the node require the canonical 'low-s' encoding for ECDSA signatures when |
| 70 | +relaying or mining. This removes a nuisance malleability vector. |
| 71 | + |
| 72 | +Consensus behavior is unchanged. |
| 73 | + |
| 74 | +If widely deployed this change would eliminate the last remaining known vector |
| 75 | +for nuisance malleability on SIGHASH_ALL P2PKH transactions. On the down-side |
| 76 | +it will block most transactions made by sufficiently out of date software. |
| 77 | + |
| 78 | +Unlike the other avenues to change txids on transactions this |
| 79 | +one was randomly violated by all deployed bitcoin software prior to |
| 80 | +its discovery. So, while other malleability vectors where made |
| 81 | +non-standard as soon as they were discovered, this one has remained |
| 82 | +permitted. Even BIP62 did not propose applying this rule to |
| 83 | +old version transactions, but conforming implementations have become |
| 84 | +much more common since BIP62 was initially written. |
| 85 | + |
| 86 | +Bitcoin Core has produced compatible signatures since a28fb70e in |
| 87 | +September 2013, but this didn't make it into a release until 0.9 |
| 88 | +in March 2014; Bitcoinj has done so for a similar span of time. |
| 89 | +Bitcoinjs and electrum have been more recently updated. |
| 90 | + |
| 91 | +This does not replace the need for BIP62 or similar, as miners can |
| 92 | +still cooperate to break transactions. Nor does it replace the |
| 93 | +need for wallet software to handle malleability sanely[1]. This |
| 94 | +only eliminates the cheap and irritating DOS attack. |
| 95 | + |
| 96 | +[1] On the Malleability of Bitcoin Transactions |
| 97 | +Marcin Andrychowicz, Stefan Dziembowski, Daniel Malinowski, Łukasz Mazurek |
| 98 | +http://fc15.ifca.ai/preproceedings/bitcoin/paper_9.pdf |
| 99 | + |
| 100 | +Minimum relay fee default increase |
| 101 | +----------------------------------- |
| 102 | + |
| 103 | +The default for the `-minrelaytxfee` setting has been increased from `0.00001` |
| 104 | +to `0.00005`. |
| 105 | + |
| 106 | +This is necessitated by the current transaction flooding, causing |
| 107 | +outrageous memory usage on nodes due to the mempool ballooning. This is a |
| 108 | +temporary measure, bridging the time until a dynamic method for determining |
| 109 | +this fee is merged (which will be in 0.12). |
| 110 | + |
| 111 | +(see https://github.com/bitcoin/bitcoin/pull/6793, as well as the 0.11 |
| 112 | +release notes, in which this value was suggested) |
| 113 | + |
| 114 | +0.11.1 Change log |
| 115 | +================= |
| 116 | + |
| 117 | +Detailed release notes follow. This overview includes changes that affect |
| 118 | +behavior, not code moves, refactors and string updates. For convenience in locating |
| 119 | +the code changes and accompanying discussion, both the pull request and |
| 120 | +git merge commit are mentioned. |
| 121 | + |
| 122 | +- #6438 `2531438` openssl: avoid config file load/race |
| 123 | +- #6439 `980f820` Updated URL location of netinstall for Debian |
| 124 | +- #6384 `8e5a969` qt: Force TLS1.0+ for SSL connections |
| 125 | +- #6471 `92401c2` Depends: bump to qt 5.5 |
| 126 | +- #6224 `93b606a` Be even stricter in processing unrequested blocks |
| 127 | +- #6571 `100ac4e` libbitcoinconsensus: avoid a crash in multi-threaded environments |
| 128 | +- #6545 `649f5d9` Do not store more than 200 timedata samples. |
| 129 | +- #6694 `834e299` [QT] fix thin space word wrap line break issue |
| 130 | +- #6703 `1cd7952` Backport bugfixes to 0.11 |
| 131 | +- #6750 `5ed8d0b` Recent rejects backport to v0.11 |
| 132 | +- #6769 `71cc9d9` Test LowS in standardness, removes nuisance malleability vector. |
| 133 | +- #6789 `b4ad73f` Update miniupnpc to 1.9.20151008 |
| 134 | +- #6785 `b4dc33e` Backport to v0.11: In (strCommand == "tx"), return if AlreadyHave() |
| 135 | +- #6412 `0095b9a` Test whether created sockets are select()able |
| 136 | +- #6795 `4dbcec0` net: Disable upnp by default |
| 137 | +- #6793 `e7bcc4a` Bump minrelaytxfee default |
| 138 | + |
| 139 | +Credits |
| 140 | +======= |
| 141 | + |
| 142 | +Thanks to everyone who directly contributed to this release: |
| 143 | + |
| 144 | +- Adam Weiss |
| 145 | +- Alex Morcos |
| 146 | +- Casey Rodarmor |
| 147 | +- Cory Fields |
| 148 | +- fanquake |
| 149 | +- Gregory Maxwell |
| 150 | +- Jonas Schnelli |
| 151 | +- J Ross Nicoll |
| 152 | +- Luke Dashjr |
| 153 | +- Pavel Janík |
| 154 | +- Pavel Vasin |
| 155 | +- Peter Todd |
| 156 | +- Pieter Wuille |
| 157 | +- randy-waterhouse |
| 158 | +- Ross Nicoll |
| 159 | +- Suhas Daftuar |
| 160 | +- tailsjoin |
| 161 | +- ฿tcDrak |
| 162 | +- Tom Harding |
| 163 | +- Veres Lajos |
| 164 | +- Wladimir J. van der Laan |
| 165 | + |
| 166 | +And those who contributed additional code review and/or security research: |
| 167 | + |
| 168 | +- timothy on IRC for reporting the issue |
| 169 | +- Vulnerability in miniupnp discovered by Aleksandar Nikolic of Cisco Talos |
| 170 | + |
| 171 | +As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/). |
| 172 | + |
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