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mastodon/lib/paperclip/blurhash_transcoder.rb
Pierre Bourdon 36bc90e8aa
blurhash_transcoder: prevent out-of-bound reads with <8bpp images (#20388)
The Blurhash library used by Mastodon requires an input encoded as 24
bits raw RGB data. The conversion to raw RGB using Imagemagick did not
previously specify the desired bit depth. In some situations, this leads
Imagemagick to output in a pixel format using less bpp than expected.
This then manifested as segfaults of the Sidekiq process due to
out-of-bounds read, or potentially a (highly noisy) memory infoleak.

Fixes #19235.
2022-11-11 07:45:16 +01:00

17 lines
515 B
Ruby

# frozen_string_literal: true
module Paperclip
class BlurhashTranscoder < Paperclip::Processor
def make
return @file unless options[:style] == :small || options[:blurhash]
pixels = convert(':source -depth 8 RGB:-', source: File.expand_path(@file.path)).unpack('C*')
geometry = options.fetch(:file_geometry_parser).from_file(@file)
attachment.instance.blurhash = Blurhash.encode(geometry.width, geometry.height, pixels, **(options[:blurhash] || {}))
@file
end
end
end