diff --git a/packages/hydrooj/locales/zh.yaml b/packages/hydrooj/locales/zh.yaml
index bf0b4010..3857b903 100644
--- a/packages/hydrooj/locales/zh.yaml
+++ b/packages/hydrooj/locales/zh.yaml
@@ -853,6 +853,8 @@ Valid for registered users who are not members of the domain: 对域外注册用
 Valid for visitors: 对未登录的游客有效
 Verify register email: 注册需邮件验证
 Version: 版本
+View all contests: 查看所有比赛
+View all homework: 查看所有作业
 View contest scoreboard: 查看比赛成绩表
 View Contest: 查看比赛
 View contests: 查看比赛
diff --git a/packages/hydrooj/src/handler/contest.ts b/packages/hydrooj/src/handler/contest.ts
index 6d633b95..0bee65fa 100644
--- a/packages/hydrooj/src/handler/contest.ts
+++ b/packages/hydrooj/src/handler/contest.ts
@@ -74,12 +74,13 @@ ScheduleModel.Worker.addHandler('contest', async (doc) => {
 export class ContestListHandler extends Handler {
     @param('rule', Types.Range(contest.RULES), true)
     @param('page', Types.PositiveInt, true)
-    @param('all', Types.Boolean)
-    async get(domainId: string, rule = '', page = 1, all = false) {
+    async get(domainId: string, rule = '', page = 1) {
         if (rule && contest.RULES[rule].hidden) throw new BadRequestError();
         const rules = Object.keys(contest.RULES).filter((i) => !contest.RULES[i].hidden);
-        if (all && !this.user.hasPerm(PERM.PERM_MOD_BADGE)) all = false;
-        const q = { ...all ? { assign: { $in: [...this.user.group, null] } } : {}, ...rule ? { rule } : { rule: { $in: rules } } };
+        const q = {
+            ...this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_CONTEST) ? {} : { $or: [{ assign: { $in: this.user.group } }, { assign: { $size: 0 } }] },
+            ...rule ? { rule } : { rule: { $in: rules } },
+        };
         const cursor = contest.getMulti(domainId, q);
         const qs = rule ? `rule=${rule}` : '';
         const [tdocs, tpcount] = await paginate<Tdoc>(cursor, page, system.get('pagination.contest'));
@@ -104,7 +105,7 @@ export class ContestDetailBaseHandler extends Handler {
             contest.get(domainId, tid),
             contest.getStatus(domainId, tid, this.user._id),
         ]);
-        if (this.tdoc.assign?.length && !this.user.own(this.tdoc)) {
+        if (this.tdoc.assign?.length && !this.user.own(this.tdoc) && !this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_CONTEST)) {
             const groups = await user.listGroup(domainId, this.user._id);
             if (!Set.intersection(this.tdoc.assign, groups.map((i) => i.name)).size) {
                 throw new NotAssignedError('contest', tid);
@@ -163,7 +164,7 @@ export class ContestDetailHandler extends Handler {
             contest.getStatus(domainId, tid, this.user._id),
         ]);
         if (contest.RULES[this.tdoc.rule].hidden) throw new ContestNotFoundError(domainId, tid);
-        if (this.tdoc.assign?.length && !this.user.own(this.tdoc)) {
+        if (this.tdoc.assign?.length && !this.user.own(this.tdoc) && !this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_CONTEST)) {
             const groups = await user.listGroup(domainId, this.user._id);
             if (!Set.intersection(this.tdoc.assign, groups.map((i) => i.name)).size) {
                 throw new NotAssignedError('contest', tid);
@@ -413,7 +414,7 @@ export class ContestEditHandler extends Handler {
     async postUpdate(
         domainId: string, tid: ObjectId, beginAtDate: string, beginAtTime: string, duration: number,
         title: string, content: string, rule: string, _pids: string, rated = false,
-        _code = '', autoHide = false, assign: string[] = null, lock: number = null,
+        _code = '', autoHide = false, assign: string[] = [], lock: number = null,
         contestDuration: number = null, maintainer: number[] = [], allowViewCode = false,
     ) {
         if (autoHide) this.checkPerm(PERM.PERM_EDIT_PROBLEM);
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index eeb7c8a5..74b6ea13 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -22,10 +22,11 @@ const convertPenaltyRules = validatePenaltyRules;
 
 class HomeworkMainHandler extends Handler {
     @param('page', Types.PositiveInt, true)
-    @param('all', Types.Boolean)
-    async get(domainId: string, page = 1, all = false) {
-        if (all && !this.user.hasPerm(PERM.PERM_MOD_BADGE)) all = false;
-        const cursor = contest.getMulti(domainId, { rule: 'homework', ...all ? { assign: { $in: [...this.user.group, null] } } : {} });
+    async get(domainId: string, page = 1) {
+        const cursor = contest.getMulti(domainId, {
+            rule: 'homework',
+            ...this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_HOMEWORK) ? {} : { $or: [{ assign: { $in: this.user.group } }, { assign: { $size: 0 } }] },
+        });
         const [tdocs, tpcount] = await paginate<Tdoc>(cursor, page, system.get('pagination.contest'));
         const calendar = [];
         for (const tdoc of tdocs) {
@@ -48,7 +49,7 @@ class HomeworkDetailHandler extends Handler {
     async prepare(domainId: string, tid: ObjectId) {
         const tdoc = await contest.get(domainId, tid);
         if (tdoc.rule !== 'homework') throw new ContestNotFoundError(domainId, tid);
-        if (tdoc.assign?.length && !this.user.own(tdoc)) {
+        if (tdoc.assign?.length && !this.user.own(tdoc) && !this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_HOMEWORK)) {
             if (!Set.intersection(tdoc.assign, this.user.group).size) {
                 throw new NotAssignedError('homework', tdoc.docId);
             }
diff --git a/packages/hydrooj/src/model/builtin.ts b/packages/hydrooj/src/model/builtin.ts
index 81509011..8066689b 100644
--- a/packages/hydrooj/src/model/builtin.ts
+++ b/packages/hydrooj/src/model/builtin.ts
@@ -69,6 +69,7 @@ export const PERM = {
     PERM_ATTEND_CONTEST: 1n << 45n,
     PERM_EDIT_CONTEST: 1n << 50n,
     PERM_EDIT_CONTEST_SELF: 1n << 51n,
+    PERM_VIEW_HIDDEN_CONTEST: 1n << 68n,
 
     // Homework
     PERM_VIEW_HOMEWORK: 1n << 52n,
@@ -78,6 +79,7 @@ export const PERM = {
     PERM_ATTEND_HOMEWORK: 1n << 56n,
     PERM_EDIT_HOMEWORK: 1n << 57n,
     PERM_EDIT_HOMEWORK_SELF: 1n << 58n,
+    PERM_VIEW_HIDDEN_HOMEWORK: 1n << 69n,
 
     // Training
     PERM_VIEW_TRAINING: 1n << 46n,
@@ -150,6 +152,7 @@ export const PERMS = [
     Permission('perm_contest', PERM.PERM_ATTEND_CONTEST, 'Attend contests'),
     Permission('perm_contest', PERM.PERM_EDIT_CONTEST, 'Edit any contests'),
     Permission('perm_contest', PERM.PERM_EDIT_CONTEST_SELF, 'Edit own contests'),
+    Permission('perm_contest', PERM.PERM_VIEW_HIDDEN_CONTEST, 'View all contests'),
     Permission('perm_homework', PERM.PERM_VIEW_HOMEWORK, 'View homework'),
     Permission('perm_homework', PERM.PERM_VIEW_HOMEWORK_SCOREBOARD, 'View homework scoreboard'),
     Permission('perm_homework', PERM.PERM_VIEW_HOMEWORK_HIDDEN_SCOREBOARD, 'View hidden homework submission status and scoreboard'),
@@ -157,6 +160,7 @@ export const PERMS = [
     Permission('perm_homework', PERM.PERM_ATTEND_HOMEWORK, 'Claim homework'),
     Permission('perm_homework', PERM.PERM_EDIT_HOMEWORK, 'Edit any homework'),
     Permission('perm_homework', PERM.PERM_EDIT_HOMEWORK_SELF, 'Edit own homework'),
+    Permission('perm_homework', PERM.PERM_VIEW_HIDDEN_HOMEWORK, 'View all homework'),
     Permission('perm_training', PERM.PERM_VIEW_TRAINING, 'View training plans'),
     Permission('perm_training', PERM.PERM_CREATE_TRAINING, 'Create training plans'),
     Permission('perm_training', PERM.PERM_EDIT_TRAINING, 'Edit training plans'),
diff --git a/packages/hydrooj/src/upgrade.ts b/packages/hydrooj/src/upgrade.ts
index cd25871a..8a029d56 100644
--- a/packages/hydrooj/src/upgrade.ts
+++ b/packages/hydrooj/src/upgrade.ts
@@ -598,6 +598,10 @@ const scripts: UpgradeScript[] = [
             await user.setById(udoc._id, { pinnedDomains: Array.from(pinnedDomains) });
         });
     },
+    async function _82_83() {
+        await document.coll.updateMany({ docType: document.TYPE_CONTEST, assign: null }, { $set: { assign: [] } });
+        return true;
+    },
 ];
 
 export default scripts;