From mboxrd@z Thu Jan 1 00:00:00 1970 From: Waiman Long Subject: [PATCH-block v2 1/3] bdi, blk-cgroup: Fix potential UAF of blkcg Date: Sun, 11 Dec 2022 17:20:56 -0500 Message-ID: <20221211222058.2946830-2-longman@redhat.com> References: <20221211222058.2946830-1-longman@redhat.com> Mime-Version: 1.0 Content-Transfer-Encoding: base64 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670797272; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+MsWk87quHbEwHCR1sVYteGgGZjHdGBkMWIDf/Jp0nk=; b=aQ7LBNBzoVLKHFtDQw0BAB6Dl0M2jW/PJiGqhglJsO33N+UgJtjCBeCOQwz68J5MqdhPow iD+BKSOymMHAjPhkwkdfvnTvPIl9FKowjy8Ib+AA4Ycv5hfAjnBkSBT5erPQJHhkuAo8/i ed0F0QFCtwLUUuIY1V6p7+S7q/dmahI= In-Reply-To: <20221211222058.2946830-1-longman@redhat.com> List-ID: Content-Type: text/plain; charset="macroman" To: Jens Axboe , Tejun Heo , Josef Bacik , Zefan Li , Johannes Weiner , Andrew Morton Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, =?UTF-8?q?Michal=20Koutn=C3=BD?= , "Dennis Zhou (Facebook)" , Waiman Long , Yi Zhang Q29tbWl0IDU5YjU3NzE3ZmZmOCAoImJsa2NnOiBkZWxheSBibGtnIGRlc3RydWN0aW9uIHVudGls IGFmdGVyCndyaXRlYmFjayBoYXMgZmluaXNoZWQiKSBkZWxheWVkIGNhbGwgdG8gYmxrY2dfZGVz dHJveV9ibGtncygpIHRvCmNnd2JfcmVsZWFzZV93b3JrZm4oKS4gSG93ZXZlciwgaXQgaXMgZG9u ZSBhZnRlciBhIGNzc19wdXQoKSBvZiBibGtjZwp3aGljaCBtYXkgYmUgdGhlIGZpbmFsIHB1dCB0 aGF0IGNhdXNlcyB0aGUgYmxrY2cgdG8gYmUgZnJlZWQgYXMgUkNVCnJlYWQgbG9jayBpc24ndCBo ZWxkLgoKQW5vdGhlciBwbGFjZSB3aGVyZSBibGtjZ19kZXN0cm95X2Jsa2dzKCkgY2FuIGJlIGNh bGxlZCBpbmRpcmVjdGx5IHZpYQpibGtjZ191bnBpbl9vbmxpbmUoKSBpcyBmcm9tIHRoZSBvZmZs aW5lX2NzcygpIGZ1bmN0aW9uIGNhbGxlZCBmcm9tCmNzc19raWxsZWRfd29ya19mbigpLiBPdmVy IHRoZXJlLCB0aGUgcG90ZW50aWFsbHkgZmluYWwgY3NzX3B1dCgpIGNhbGwKaXMgaXNzdWVkIGFm dGVyIG9mZmxpbmVfY3NzKCkuCgpCeSBhZGRpbmcgYSBjc3NfdHJ5Z2V0KCkgaW50byBibGtjZ19k ZXN0cm95X2Jsa2dzKCkgYW5kIHdhcm5pbmcgaXRzCmZhaWx1cmUsIHRoZSBmb2xsb3dpbmcgc3Rh Y2sgdHJhY2Ugd2FzIHByb2R1Y2VkIGluIGEgdGVzdCBzeXN0ZW0gb24KYm9vdHVwLgoKWyAgIDM0 LjI1NDI0MF0gUklQOiAwMDEwOmJsa2NnX2Rlc3Ryb3lfYmxrZ3MrMHgxNmEvMHgxYTAKICAgICAg OgpbICAgMzQuMzM5OTQzXSBDYWxsIFRyYWNlOgpbICAgMzQuMzQ0NTEwXSAgYmxrY2dfdW5waW5f b25saW5lKzB4MzgvMHg2MApbICAgMzQuMzQ4NTIzXSAgY2d3Yl9yZWxlYXNlX3dvcmtmbisweDZh LzB4MjAwClsgICAzNC4zNTI3MDhdICBwcm9jZXNzX29uZV93b3JrKzB4MWU1LzB4M2IwClsgICAz NC4zNjA3NThdICB3b3JrZXJfdGhyZWFkKzB4NTAvMHgzYTAKWyAgIDM0LjM2ODQ0N10gIGt0aHJl YWQrMHhkOS8weDEwMApbICAgMzQuMzc2Mzg2XSAgcmV0X2Zyb21fZm9yaysweDIyLzB4MzAKClRo aXMgY29uZmlybXMgdGhhdCBhIHBvdGVudGlhbCBVQUYgc2l0dWF0aW9uIGNhbiByZWFsbHkgaGFw cGVuIGluCmNnd2JfcmVsZWFzZV93b3JrZm4oKS4KCkZpeCB0aGF0IGJ5IGRlbGF5aW5nIHRoZSBj c3NfcHV0KCkgdW50aWwgYWZ0ZXIgdGhlIGJsa2NnX3VucGluX29ubGluZSgpCmNhbGwuIEFsc28g dXNlIGNzc190cnlnZXQoKSBpbiBibGtjZ19kZXN0cm95X2Jsa2dzKCkgYW5kIGlzc3VlIGEgd2Fy bmluZwppZiBjc3NfdHJ5Z2V0KCkgZmFpbHMuCgpUaGUgcmVwcm9kdWNpbmcgc3lzdGVtIGNhbiBu byBsb25nZXIgcHJvZHVjZSBhIHdhcm5pbmcgd2l0aCB0aGlzIHBhdGNoLgpBbGwgdGhlIHJ1bm5h YmxlIGJsb2NrLzAqIHRlc3RzIGluY2x1ZGluZyBibG9jay8wMjcgd2VyZSBydW4gc3VjY2Vzc2Z1 bGx5CndpdGhvdXQgZmFpbHVyZS4KCkZpeGVzOiA1OWI1NzcxN2ZmZjggKCJibGtjZzogZGVsYXkg YmxrZyBkZXN0cnVjdGlvbiB1bnRpbCBhZnRlciB3cml0ZWJhY2sgaGFzIGZpbmlzaGVkIikKU3Vn Z2VzdGVkLWJ5OiBNaWNoYWwgS291dG7DvSA8bWtvdXRueUBzdXNlLmNvbT4KUmVwb3J0ZWQtYnk6 IFlpIFpoYW5nIDx5aS56aGFuZ0ByZWRoYXQuY29tPgpTaWduZWQtb2ZmLWJ5OiBXYWltYW4gTG9u ZyA8bG9uZ21hbkByZWRoYXQuY29tPgotLS0KIGJsb2NrL2Jsay1jZ3JvdXAuYyB8IDggKysrKysr KysKIG1tL2JhY2tpbmctZGV2LmMgICB8IDggKysrKysrLS0KIDIgZmlsZXMgY2hhbmdlZCwgMTQg aW5zZXJ0aW9ucygrKSwgMiBkZWxldGlvbnMoLSkKCmRpZmYgLS1naXQgYS9ibG9jay9ibGstY2dy b3VwLmMgYi9ibG9jay9ibGstY2dyb3VwLmMKaW5kZXggMWJiOTM5ZDNiNzkzLi4yMWNjODgzNDlm MjEgMTAwNjQ0Ci0tLSBhL2Jsb2NrL2Jsay1jZ3JvdXAuYworKysgYi9ibG9jay9ibGstY2dyb3Vw LmMKQEAgLTEwODQsNiArMTA4NCwxMyBAQCBzdHJ1Y3QgbGlzdF9oZWFkICpibGtjZ19nZXRfY2d3 Yl9saXN0KHN0cnVjdCBjZ3JvdXBfc3Vic3lzX3N0YXRlICpjc3MpCiAgKi8KIHN0YXRpYyB2b2lk IGJsa2NnX2Rlc3Ryb3lfYmxrZ3Moc3RydWN0IGJsa2NnICpibGtjZykKIHsKKwkvKgorCSAqIGJs a2NnX2Rlc3Ryb3lfYmxrZ3MoKSBzaG91bGRuJ3QgYmUgY2FsbGVkIHdpdGggYWxsIHRoZSBibGtj ZworCSAqIHJlZmVyZW5jZXMgZ29uZS4KKwkgKi8KKwlpZiAoV0FSTl9PTl9PTkNFKCFjc3NfdHJ5 Z2V0KCZibGtjZy0+Y3NzKSkpCisJCXJldHVybjsKKwogCW1pZ2h0X3NsZWVwKCk7CiAKIAlzcGlu X2xvY2tfaXJxKCZibGtjZy0+bG9jayk7CkBAIC0xMTEwLDYgKzExMTcsNyBAQCBzdGF0aWMgdm9p ZCBibGtjZ19kZXN0cm95X2Jsa2dzKHN0cnVjdCBibGtjZyAqYmxrY2cpCiAJfQogCiAJc3Bpbl91 bmxvY2tfaXJxKCZibGtjZy0+bG9jayk7CisJY3NzX3B1dCgmYmxrY2ctPmNzcyk7CiB9CiAKIC8q KgpkaWZmIC0tZ2l0IGEvbW0vYmFja2luZy1kZXYuYyBiL21tL2JhY2tpbmctZGV2LmMKaW5kZXgg YzMwNDE5YTVlMTE5Li4zNmY3NWIwNzIzMjUgMTAwNjQ0Ci0tLSBhL21tL2JhY2tpbmctZGV2LmMK KysrIGIvbW0vYmFja2luZy1kZXYuYwpAQCAtMzkwLDExICszOTAsMTUgQEAgc3RhdGljIHZvaWQg Y2d3Yl9yZWxlYXNlX3dvcmtmbihzdHJ1Y3Qgd29ya19zdHJ1Y3QgKndvcmspCiAJd2Jfc2h1dGRv d24od2IpOwogCiAJY3NzX3B1dCh3Yi0+bWVtY2dfY3NzKTsKLQljc3NfcHV0KHdiLT5ibGtjZ19j c3MpOwogCW11dGV4X3VubG9jaygmd2ItPmJkaS0+Y2d3Yl9yZWxlYXNlX211dGV4KTsKIAotCS8q IHRyaWdnZXJzIGJsa2cgZGVzdHJ1Y3Rpb24gaWYgbm8gb25saW5lIHVzZXJzIGxlZnQgKi8KKwkv KgorCSAqIFRyaWdnZXJzIGJsa2cgZGVzdHJ1Y3Rpb24gaWYgbm8gb25saW5lIHVzZXJzIGxlZnQK KwkgKiBUaGUgZmluYWwgYmxrY2cgY3NzX3B1dCgpIGhhcyB0byBiZSBkb25lIGFmdGVyIGJsa2Nn X3VucGluX29ubGluZSgpCisJICogdG8gYXZvaWQgdXNlLWFmdGVyLWZyZWUuCisJICovCiAJYmxr Y2dfdW5waW5fb25saW5lKHdiLT5ibGtjZ19jc3MpOworCWNzc19wdXQod2ItPmJsa2NnX2Nzcyk7 CiAKIAlmcHJvcF9sb2NhbF9kZXN0cm95X3BlcmNwdSgmd2ItPm1lbWNnX2NvbXBsZXRpb25zKTsK IAotLSAKMi4zMS4xCgo=