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Drop message decode max length to 4_000_000 #340

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merged 1 commit into from Nov 12, 2019

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TheBlueMatt
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It has been a long time since Bitcoin's maximum network message
length was 32MB, so we should follow suit. This is also an important
DoS limit, so we should limit it as much as possible.

It has been a long time since Bitcoin's maximum network message
length was 32MB, so we should follow suit. This is also an important
DoS limit, so we should limit it as much as possible.
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Codecov Report

Merging #340 into master will decrease coverage by 0.25%.
The diff coverage is n/a.

Impacted file tree graph

@@            Coverage Diff             @@
##           master     #340      +/-   ##
==========================================
- Coverage   81.89%   81.64%   -0.26%     
==========================================
  Files          38       38              
  Lines        7169     7032     -137     
==========================================
- Hits         5871     5741     -130     
+ Misses       1298     1291       -7
Impacted Files Coverage Δ
src/consensus/encode.rs 76.77% <ø> (ø) ⬆️
src/network/message_network.rs 25% <0%> (-10%) ⬇️
src/network/message.rs 61.23% <0%> (-7.36%) ⬇️
src/blockdata/block.rs 70.67% <0%> (-3.15%) ⬇️
src/network/stream_reader.rs 95.62% <0%> (-2.06%) ⬇️
src/util/misc.rs 96.77% <0%> (-0.37%) ⬇️

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@apoelstra apoelstra left a comment

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Nice. Trusting you that this matches Core's behaviour.

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Checked Core, LGTM

@tamasblummer tamasblummer self-requested a review November 11, 2019 08:11
@dongcarl
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In the future we might want to decouple the limit for deserializing any Vecs from the limit for deserializing network messages... Or at least rename it to something less confusing... But we can do that after merge.

@apoelstra apoelstra merged commit 700ed54 into rust-bitcoin:master Nov 12, 2019
dagurval added a commit to dagurval/rust-bitcoin that referenced this pull request Jul 15, 2020
This adds the feature flag 'bump-decode-max-size' that when set, sets
maximum decode size to 32MB, as it was before PR rust-bitcoin#340.
dagurval added a commit to dagurval/rust-bitcoin that referenced this pull request Jul 15, 2020
This adds the feature flag 'bump-decode-max-size' that when set, sets
maximum decode size to the limit it was before PR rust-bitcoin#340.
yancyribbens pushed a commit to yancyribbens/rust-bitcoin that referenced this pull request Mar 23, 2024
…tisfaction size

747876e Rectify `from_multi_a` max satisfaction size (Aman Rojjha)

Pull request description:

  Cost incurred for a single Schnorr signature in the witness stack := `<var_int><64-byte signature><sig_type>` = 1 + 64 + 1 (as clarified by @sanket1729 in rust-bitcoin#340 ).

ACKs for top commit:
  sanket1729:
    ACK 747876e

Tree-SHA512: f20652240f1daa7b33b1d525870114e0bd6412e82845e80a94c616dedcfb3d8ae2f7ef19d7c08760f79270e0d465c18b713eff2e3e599b45c65f2a64da36713b
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6 participants