kikobar/mastodon
1
0
Fork 0
mirror of https://github.com/kikobar/mastodon.git synced 2024-11-16 20:22:18 +00:00
Code Issues Packages Projects Releases Wiki Activity

blurhash_transcoder: prevent out-of-bound reads with <8bpp images (#20388)

Browse source 
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.
This commit is contained in:
Pierre Bourdon 2022-11-11 07:45:16 +01:00 committed by Claire
parent 47eaf85f02
commit 1659788de4
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
lib/paperclip/blurhash_transcoder.rb
View file

@ -5,7 +5,7 @@ module Paperclip
def make
return @file unless options[:style] == :small || options[:blurhash]
pixels = convert(':source RGB:-', source: File.expand_path(@file.path)).unpack('C*')
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] || {}))