1329377 - DoS using CSS animation and large images

Status: RESOLVED DUPLICATE of bug 1370412

(Core :: Graphics: ImageLib, defect, P3)

Description

[Thomas Daede [:TD-Linux]]

The site listed (source here: https://github.com/firefox-is-a-good-browser/firefox-is-a-good-browser.github.io) uses a large amount of memory and CPU, which persists when the tab is closed.

The relevant part seems to be the following CSS:

a {
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    animation: a 1s ease-in-out 0s infinite alternate;
    opacity: .99;
    background: #fff url("data:image/jpeg;base64,--ommitted--") center/100% 100%
}

where the jpeg is actually a 10000x10000 png (that displays fine in firefox). My wild guess is that the animation is creating frames faster than layers can consume them, but I haven't looked into it.

Comment 1

[Timothy Nikkel (:tnikkel)]

This looks to be a very bad case of bug 1243446/bug 1139928.