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Limit embedded groupChange size

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Co-authored-by: trevor-signal <131492920+trevor-signal@users.noreply.github.com>
This commit is contained in:
automated-signal
2026-02-19 12:50:38 -06:00
committed by GitHub
parent 999297d33b
commit b9d682cf00
1 changed files with 15 additions and 1 deletions
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16
ts/textsecure/SendMessage.preload.ts
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@@ -112,6 +112,8 @@ import type {
const log = createLogger('SendMessage');
const MAX_EMBEDDED_GROUP_CHANGE_BYTES = 2048;
export type SendIdentifierData =
| {
accessKey: string;
@@ -416,7 +418,19 @@ class Message {
proto.groupV2 = new Proto.GroupContextV2();
proto.groupV2.masterKey = this.groupV2.masterKey;
proto.groupV2.revision = this.groupV2.revision;
proto.groupV2.groupChange = this.groupV2.groupChange || null;
const { groupChange } = this.groupV2;
if (groupChange) {
if (groupChange.byteLength <= MAX_EMBEDDED_GROUP_CHANGE_BYTES) {
proto.groupV2.groupChange = groupChange;
} else {
// As a message-size optimization, we do not embed large updates and receiving
// devices fetch them from the group server instead
log.info(
`Discarding oversized group change proto (${groupChange.byteLength} bytes)`
);
}
}
}
if (this.sticker) {
proto.sticker = new Proto.DataMessage.Sticker();