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[2620:137:e000::3:4]) by mx.google.com with ESMTPS id by5-20020a056a02058500b00565db2812a0si3306893pgb.60.2023.09.15.01.33.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 01:33:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) client-ip=2620:137:e000::3:4; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by howler.vger.email (Postfix) with ESMTP id 9828D827AFB3; Fri, 15 Sep 2023 01:23:48 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at howler.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232905AbjIOIXo (ORCPT + 32 others); Fri, 15 Sep 2023 04:23:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232925AbjIOIXl (ORCPT ); Fri, 15 Sep 2023 04:23:41 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00232449C for ; Fri, 15 Sep 2023 01:22:29 -0700 (PDT) Received: from kwepemi500008.china.huawei.com (unknown [172.30.72.53]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4Rn6XB5N3gzMlNh; Fri, 15 Sep 2023 16:18:34 +0800 (CST) Received: from huawei.com (10.90.53.73) by kwepemi500008.china.huawei.com (7.221.188.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Fri, 15 Sep 2023 16:22:03 +0800 From: Jinjie Ruan To: , , "Peter Zijlstra (Intel)" , Christophe Leroy , Josh Poimboeuf CC: Subject: [PATCH] static_call: Fix a wild-memory-access bug in static_call_del_module() Date: Fri, 15 Sep 2023 16:21:25 +0800 Message-ID: <20230915082126.4187913-1-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemi500008.china.huawei.com (7.221.188.139) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Fri, 15 Sep 2023 01:23:48 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777091801355342246 X-GMAIL-MSGID: 1777091801355342246 Inject fault while probing btrfs.ko, if the first kzalloc() fails in __static_call_init(), key->mods will no be initialized. And then in static_call_del_module() the site_mod->mod will cause wild-memory-access as below: So assign key->mods to NULL in __static_call_init() if it fails to fix the issue. And if kzalloc fails, it will just return in init func, so it should break if it the key->mods is NULL in exit func. general protection fault, probably for non-canonical address 0xeb800159c89f94a0: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x5c002ace44fca500-0x5c002ace44fca507] CPU: 2 PID: 1843 Comm: modprobe Tainted: G W N 6.6.0-rc1+ #60 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:static_call_del_module+0x113/0x280 Code: 3c 20 00 0f 85 ef 00 00 00 49 8b 6e 08 48 85 ed 75 0d eb 75 48 85 db 74 70 49 89 ef 48 89 dd 48 8d 7d 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 78 48 89 e8 4c 8b 6d 08 48 c1 e8 03 42 80 3c 20 RSP: 0018:ffff888101d3f860 EFLAGS: 00010206 RAX: 0b800559c89f94a0 RBX: 5c002ace44fca4f8 RCX: ffffffffa0210f00 RDX: ffffffffa0210ed4 RSI: ffffffffa0210edc RDI: 5c002ace44fca500 RBP: 5c002ace44fca4f8 R08: 0000000000000000 R09: ffffed10233e4eea R10: ffffed10233e4ee9 R11: ffff888119f2774b R12: dffffc0000000000 R13: 80002ace3cfca4f8 R14: ffffffff85196de0 R15: ffffffff84ee9f99 FS: 00007f4ff6faa540(0000) GS:ffff888119f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc3d1f19e8 CR3: 0000000109fa6001 CR4: 0000000000170ee0 DR0: ffffffff8faefce8 DR1: ffffffff8faefce9 DR2: ffffffff8faefcea DR3: ffffffff8faefceb DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ? __die_body+0x1b/0x60 ? die_addr+0x43/0x70 ? exc_general_protection+0x121/0x210 ? asm_exc_general_protection+0x22/0x30 ? static_call_del_module+0x113/0x280 ? __SCT__tp_func_ipi_exit+0x8/0x8 static_call_module_notify+0x27f/0x390 ? rcu_segcblist_inc_len+0x17/0x20 notifier_call_chain+0xbf/0x280 notifier_call_chain_robust+0x7f/0xe0 ? notifier_call_chain+0x280/0x280 ? kasan_quarantine_put+0x46/0x160 blocking_notifier_call_chain_robust+0x5b/0x80 load_module+0x4d1d/0x69f0 ? module_frob_arch_sections+0x20/0x20 ? update_cfs_group+0x10c/0x2a0 ? __wake_up_common+0x10b/0x5d0 ? kernel_read_file+0x3ca/0x510 ? __x64_sys_fsconfig+0x650/0x650 ? __schedule+0xa0b/0x2a60 ? init_module_from_file+0xd2/0x130 init_module_from_file+0xd2/0x130 ? __ia32_sys_init_module+0xa0/0xa0 ? _raw_spin_lock_irqsave+0xe0/0xe0 ? ptrace_stop+0x487/0x790 idempotent_init_module+0x32d/0x6a0 ? init_module_from_file+0x130/0x130 ? __fget_light+0x57/0x500 __x64_sys_finit_module+0xbb/0x130 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f4ff691b839 Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc07b09718 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 RAX: ffffffffffffffda RBX: 000055978f13e070 RCX: 00007f4ff691b839 RDX: 0000000000000000 RSI: 000055978da1bc2e RDI: 0000000000000003 RBP: 000055978da1bc2e R08: 0000000000000000 R09: 000055978f13ddb0 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 000055978f13e020 R14: 0000000000040000 R15: 000055978f13ddb0 Modules linked in: tifm_core(+) Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 0000000000000000 ]--- RIP: 0010:static_call_del_module+0x113/0x280 Code: 3c 20 00 0f 85 ef 00 00 00 49 8b 6e 08 48 85 ed 75 0d eb 75 48 85 db 74 70 49 89 ef 48 89 dd 48 8d 7d 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 78 48 89 e8 4c 8b 6d 08 48 c1 e8 03 42 80 3c 20 RSP: 0018:ffff888101d3f860 EFLAGS: 00010206 RAX: 0b800559c89f94a0 RBX: 5c002ace44fca4f8 RCX: ffffffffa0210f00 RDX: ffffffffa0210ed4 RSI: ffffffffa0210edc RDI: 5c002ace44fca500 RBP: 5c002ace44fca4f8 R08: 0000000000000000 R09: ffffed10233e4eea R10: ffffed10233e4ee9 R11: ffff888119f2774b R12: dffffc0000000000 R13: 80002ace3cfca4f8 R14: ffffffff85196de0 R15: ffffffff84ee9f99 FS: 00007f4ff6faa540(0000) GS:ffff888119f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc3d1f19e8 CR3: 0000000109fa6001 CR4: 0000000000170ee0 DR0: ffffffff8faefce8 DR1: ffffffff8faefce9 DR2: ffffffff8faefcea DR3: ffffffff8faefceb DR6: 00000000ffff0ff0 DR7: 0000000000000600 Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 1 seconds.. Fixes: 8fd4ddda2f49 ("static_call: Don't make __static_call_return0 static") Signed-off-by: Jinjie Ruan --- kernel/static_call_inline.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/static_call_inline.c b/kernel/static_call_inline.c index 639397b5491c..e7aa70d33530 100644 --- a/kernel/static_call_inline.c +++ b/kernel/static_call_inline.c @@ -256,8 +256,10 @@ static int __static_call_init(struct module *mod, } site_mod = kzalloc(sizeof(*site_mod), GFP_KERNEL); - if (!site_mod) + if (!site_mod) { + key->mods = NULL; return -ENOMEM; + } /* * When the key has a direct sites pointer, extract @@ -422,7 +424,7 @@ static void static_call_del_module(struct module *mod) ; if (!site_mod) - continue; + break; *prev = site_mod->next; kfree(site_mod);