eliott/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird synced 2026-04-26 09:45:06 +02:00
Code Issues Packages Projects Releases Wiki Activity

LibWeb: Implement basic high resolution time coarsening

Browse Source 
Several interfaces that return a high resolution time require that
time to be coarsened, in order to prevent timing attacks. This
implementation simply reduces the resolution of the returned timestamp
to the minimum values given in the specification. Further work may be
needed to make our implementation more robust to the kind of attacks
that this mechanism is designed to prevent.
This commit is contained in:
Tim Ledbetter
2025-01-28 10:47:32 +00:00
committed by Alexander Kalenik
parent a5be7cb6fb
commit 39445d6dd6
Notes: github-actions[bot] 2025-01-30 17:39:14 +00:00 
Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/39445d6dd68
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3381
Reviewed-by: https://github.com/AtkinsSJ ✅
7 changed files with 100 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
Tests/LibWeb/Text/input/PerformanceObserver/PerformanceObserver_basic.html
View File

@@ -5,6 +5,14 @@
bufferedMessages.push(message);
}
function synchronousWaitMicroseconds(microseconds) {
var start = performance.now() * 1000,
now = start;
while (now - start < microseconds) {
now = performance.now() * 1000;
}
}
const globalObserver = new PerformanceObserver((list, observer) => {
printlnBuffered(`observer === globalObserver: ${observer === globalObserver}`);
printlnBuffered(
@@ -53,7 +61,11 @@
globalObserver.observe({ entryTypes: ["measure", "mark"] });
const startMark = performance.mark("start");
// The resolution of the clock used by the Performance interface is 100 microseconds, so we wait twice that time
// between calls to ensure they are ordered as we expect.
synchronousWaitMicroseconds(200);
const endMark = performance.mark("end");
synchronousWaitMicroseconds(200);
const measureMark = performance.measure("measure", "start", "end");
function printCatchedException(func) {