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[2620:137:e000::3:2]) by mx.google.com with ESMTPS id q16-20020a170902789000b001c73e886f68si1434910pll.316.2023.10.18.23.35.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Oct 2023 23:35:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) client-ip=2620:137:e000::3:2; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=JVAqBUXa; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by agentk.vger.email (Postfix) with ESMTP id E2AA78099CC5; Wed, 18 Oct 2023 23:35:50 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at agentk.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232587AbjJSGfe (ORCPT + 99 others); Thu, 19 Oct 2023 02:35:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229894AbjJSGfc (ORCPT ); Thu, 19 Oct 2023 02:35:32 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 46E8CBE; Wed, 18 Oct 2023 23:35:30 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8949AC433C7; Thu, 19 Oct 2023 06:35:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697697329; bh=KA6O+8wuL7bGbE8RNGjJQMf6hGTC2K3wIvLXI7A/9h8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=JVAqBUXatrh6lsx7lizXLecsW9xI+CWJ0TqjTi8U+rIBtOohwBaDyp/s1bqa4Y4fx CNS8JcSz2PKjLXJhhtvk1/9YTDOD7eNpzqkybbEPWra3a6lbhlazAznTRbqXW3ceet WCs90WuqSpDVQ/m46Eyv6RAn2SD6RgUd+J7X8N0LPZ0Kmuu0aGnAW0jXVIdDxZS3N0 7oNFdrTe/waoS6/M8qkS2m/M6DE2/O8c2ZlKfKrK/32koxpYiqdXzXNvwBY+sSDs0Z qfT7d4Hr5gud3x0ZMbRv3m+U81ZPzEB9XoHE/r37ckVHOMA4kj8Pab2QcTiU4PMBRb S3FBUJgNm1Kbg== Date: Wed, 18 Oct 2023 23:35:27 -0700 From: Josh Poimboeuf To: Borislav Petkov Cc: Ingo Molnar , linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org, David Kaplan , "Peter Zijlstra (Intel)" , x86@kernel.org, David Howells Subject: Re: [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime Message-ID: <20231019063527.iwgyioxi2gznnshp@treble> References: <20231012141031.GHZSf+V1NjjUJTc9a9@fat_crate.local> <169713303534.3135.10558074245117750218.tip-bot2@tip-bot2> <20231018132352.GBZS/caGJ8Wk9kmTbg@fat_crate.local> <20231018151245.GCZS/17QhDGe7q6K+w@fat_crate.local> <20231018155433.z4auwckr5s27wnig@treble> <20231018175531.GEZTAcE2p92U1AuVp1@fat_crate.local> <20231018203747.GJZTBCG7mv5HL4w6CC@fat_crate.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20231018203747.GJZTBCG7mv5HL4w6CC@fat_crate.local> X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email 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 (agentk.vger.email [0.0.0.0]); Wed, 18 Oct 2023 23:35:51 -0700 (PDT) On Wed, Oct 18, 2023 at 10:37:47PM +0200, Borislav Petkov wrote: > +++ b/arch/x86/kernel/alternative.c > @@ -748,14 +748,20 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end) > continue; > > op = insn.opcode.bytes[0]; > - if (op == JMP32_INSN_OPCODE) > + if (op == JMP32_INSN_OPCODE || op == JMP8_INSN_OPCODE) > dest = addr + insn.length + insn.immediate.value; I can recreate (with my GCC 12) by disabling CONFIG_CALL_DEPTH_TRACKING and CONFIG_CPU_SRSO, which puts __x86_return_thunk() close enough to the retpolines to enable the two-byte JMP in the last retpoline. And then booting with spectre_v2=retpoline. (Then to force two-byte JMPs for more retpolines, I cheated and just moved __x86_return_thunk() to right after the retpolines.) Your WARN patch didn't seem to fix the no-output hang for me, maybe due to recursive warnings? I was able to get more output by changing the WARN to (ahem) WARN_ONCE, but it's still getting into some kind of stack corruption. Full output below. I haven't had a chance to look further, but it's worrisome that even the WARN_ONCE isn't being recovered from. Regardless of if we revert e92626af3234 ("x86/retpoline: Remove .text..__x86.return_thunk section"), or do the above patch, we still need to figure out why even WARN_ONCE() would be borking things. Off to bed... [ 0.403286] ------------[ cut here ]------------ [ 0.403286] missing return thunk: __x86_indirect_thunk_r12+0xa/0x20-0x0: eb 74 66 66 2e [ 0.403286] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/alternative.c:742 apply_returns+0xca/0x23a [ 0.403286] Modules linked in: [ 0.403286] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.0-rc2+ #193 [ 0.403286] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc37 04/01/2014 [ 0.403286] RIP: 0010:apply_returns+0xca/0x23a [ 0.403286] Code: 80 3d fa e2 65 01 00 75 b4 49 89 d8 b9 05 00 00 00 48 89 ea 48 89 de 48 c7 c7 c0 35 1a 82 c6 05 dc e2 65 01 01 e8 00 2c 0a 00 <0f> 0b eb 8f f6 05 50 18 e3 01 02 74 26 0f b6 54 24 52 48 63 44 24 [ 0.403286] RSP: 0000:ffffffff82403e30 EFLAGS: 00010282 [ 0.403286] RAX: 0000000000000000 RBX: ffffffff81aa100a RCX: 0000000000000003 [ 0.403286] RDX: 0000000000000003 RSI: 0000000000000003 RDI: 0000000000000001 [ 0.403286] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 0.403286] R10: 0000000000000003 R11: ffffffff82403961 R12: ffffffff82e421f4 [ 0.403286] R13: ffffffff82e42218 R14: ffffffff82411f40 R15: 0000000000093cb0 [ 0.403286] FS: 0000000000000000(0000) GS:ffff88817b600000(0000) knlGS:0000000000000000 [ 0.403286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.403286] CR2: ffff88817ffff000 CR3: 000000000243c001 CR4: 0000000000770ef0 [ 0.403286] PKRU: 55555554 [ 0.403286] Call Trace: [ 0.403286] [ 0.403286] ? __warn+0xab/0x148 [ 0.403286] ? report_bug+0x109/0x17e [ 0.403286] ? apply_returns+0xca/0x23a [ 0.403286] ? handle_bug+0x41/0x6f [ 0.403286] ? exc_invalid_op+0x13/0x60 [ 0.403286] ? asm_exc_invalid_op+0x16/0x20 [ 0.403286] ? __x86_indirect_thunk_r12+0xa/0x20 [ 0.403286] ? apply_returns+0xca/0x23a [ 0.403286] ? __x86_indirect_thunk_r12+0xa/0x20 [ 0.403286] ? __x86_indirect_thunk_r12+0x19/0x20 [ 0.403286] ? __x86_indirect_thunk_r12+0xc/0x20 [ 0.403286] alternative_instructions+0x48/0xf5 [ 0.403286] arch_cpu_finalize_init+0xca/0xeb [ 0.403286] start_kernel+0x588/0x610 [ 0.403286] x86_64_start_reservations+0x25/0x25 [ 0.403286] x86_64_start_kernel+0x73/0x73 [ 0.403286] secondary_startup_64_no_verify+0x166/0x16b [ 0.403286] [ 0.403286] irq event stamp: 116873 [ 0.403286] hardirqs last enabled at (116883): [] console_unlock+0xb0/0xfe [ 0.403286] hardirqs last disabled at (116892): [] console_unlock+0x95/0xfe [ 0.403286] softirqs last enabled at (0): [<0000000000000000>] 0x0 [ 0.403286] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 0.403286] ---[ end trace 0000000000000000 ]--- [ 0.403286] ------------[ cut here ]------------ [ 0.403286] Unconverted return thunk [ 0.403286] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/bugs.c:2855 check_thunks+0x21/0x28 [ 0.403286] Modules linked in: [ 0.403286] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.6.0-rc2+ #193 [ 0.403286] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc37 04/01/2014 [ 0.403286] RIP: 0010:check_thunks+0x21/0x28 [ 0.403286] Code: be 02 00 00 e9 3b f3 ff ff 0f 1f 44 00 00 80 3d c9 0f 65 01 00 75 15 48 c7 c7 9b 61 1a 82 c6 05 b9 0f 65 01 01 e8 c3 58 09 00 <0f> 0b c3 cc cc cc cc 89 ff e8 54 09 02 00 90 c3 cc cc cc cc 53 89 [ 0.403286] RSP: 0000:ffffffff824039f8 EFLAGS: 00010082 [ 0.403286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000003 [ 0.403286] RDX: 0000000000000004 RSI: 0000000000000003 RDI: 0000000000000001 [ 0.403286] RBP: ffffffff82403aa8 R08: 0000000000000000 R09: 0000000000000000 [ 0.403286] R10: 7574657220646574 R11: 7265766e6f636e55 R12: ffffffff824128c0 [ 0.403286] R13: ffffffff8117bdf0 R14: ffffffff82403ab8 R15: ffffffff83097580 [ 0.403286] FS: 0000000000000000(0000) GS:ffff88817b600000(0000) knlGS:0000000000000000 [ 0.403286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.403286] CR2: ffff88817ffff000 CR3: 000000000243c001 CR4: 0000000000770ef0 [ 0.403286] PKRU: 55555554 [ 0.403286] Call Trace: [ 0.403286] [ 0.403286] ? __warn+0xab/0x148 [ 0.403286] ? report_bug+0x109/0x17e [ 0.403286] ? check_thunks+0x21/0x28 [ 0.403286] ? handle_bug+0x41/0x6f [ 0.403286] ? exc_invalid_op+0x13/0x60 [ 0.403286] ? asm_exc_invalid_op+0x16/0x20 [ 0.403286] ? write_profile+0x163/0x163 [ 0.403286] ? check_thunks+0x21/0x28 [ 0.403286] ? check_thunks+0x21/0x28 [ 0.403286] __x86_return_thunk+0x5/0x7f [ 0.403286] write_profile+0x163/0x163 [ 0.403286] arch_stack_walk+0xa3/0xda [ 0.403286] ? stack_trace_save+0x48/0x6a [ 0.403286] stack_trace_save+0x48/0x6a [ 0.403286] save_trace+0x60/0x27a [ 0.403286] mark_lock+0x108/0x357 [ 0.403286] ? desc_read+0x21/0xc5 [ 0.403286] ? insn_get_prefixes+0x17f/0x248 [ 0.403286] ? insn_get_opcode+0xd8/0x13a [ 0.403286] __lock_acquire+0x538/0x1108 [ 0.403286] ? skip_nops+0x40/0x8e [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] lock_acquire+0x12b/0x277 [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] ? insn_get_displacement+0x29/0x10a [ 0.403286] ? __copy_user_flushcache+0x1d/0x94 [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] __mutex_lock+0xbb/0x3ff [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] ? tracer_hardirqs_on+0x2c/0xd8 [ 0.403286] ? text_poke_early+0x85/0x95 [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] _vm_unmap_aliases+0x58/0x203 [ 0.403286] ? __copy_user_flushcache+0x1d/0x94 [ 0.403286] change_page_attr_set_clr+0xc0/0x24f [ 0.403286] change_page_attr_set.constprop.0+0xf/0x15 [ 0.403286] set_memory_nx+0x27/0x2d [ 0.403286] free_init_pages+0x54/0x83 [ 0.403286] alternative_instructions+0xe1/0xf5 [ 0.403286] arch_cpu_finalize_init+0xca/0xeb [ 0.403286] start_kernel+0x588/0x610 [ 0.403286] x86_64_start_reservations+0x25/0x25 [ 0.403286] x86_64_start_kernel+0x73/0x73 [ 0.403286] secondary_startup_64_no_verify+0x166/0x16b [ 0.403286] [ 0.403286] irq event stamp: 122505 [ 0.403286] hardirqs last enabled at (122505): [] text_poke_early+0x85/0x95 [ 0.403286] hardirqs last disabled at (122504): [] text_poke_early+0x72/0x95 [ 0.403286] softirqs last enabled at (0): [<0000000000000000>] 0x0 [ 0.403286] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 0.403286] ---[ end trace 0000000000000000 ]--- [ 0.403286] BUG: kernel NULL pointer dereference, address: 0000000000000011 [ 0.403286] #PF: supervisor read access in kernel mode [ 0.403286] #PF: error_code(0x0000) - not-present page [ 0.403286] PGD 0 P4D 0 [ 0.403286] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 0.403286] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.6.0-rc2+ #193 [ 0.403286] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc37 04/01/2014 [ 0.403286] RIP: 0010:stack_trace_consume_entry+0x5/0x3c [ 0.403286] Code: 48 89 d8 48 8b 54 24 08 65 48 2b 14 25 28 00 00 00 74 05 e8 f9 47 91 00 48 83 c4 10 5b 5d 41 5c c3 cc cc cc cc 0f 1f 44 00 00 <8b> 47 10 31 d2 3b 47 08 73 26 8b 57 0c 85 d2 74 09 ff ca 89 57 0c [ 0.403286] RSP: 0000:ffffffff82403a08 EFLAGS: 00010082 [ 0.403286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000003 [ 0.403286] RDX: 0000000000000004 RSI: 0000000000000003 RDI: 0000000000000001 [ 0.403286] RBP: ffffffff82403aa8 R08: 0000000000000000 R09: 0000000000000000 [ 0.403286] R10: 7574657220646574 R11: 7265766e6f636e55 R12: ffffffff824128c0 [ 0.403286] R13: ffffffff8117bdf0 R14: ffffffff82403ab8 R15: ffffffff83097580 [ 0.403286] FS: 0000000000000000(0000) GS:ffff88817b600000(0000) knlGS:0000000000000000 [ 0.403286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.403286] CR2: 0000000000000011 CR3: 000000000243c001 CR4: 0000000000770ef0 [ 0.403286] PKRU: 55555554 [ 0.403286] Call Trace: [ 0.403286] [ 0.403286] ? __die_body+0x1a/0x5c [ 0.403286] ? page_fault_oops+0x333/0x380 [ 0.403286] ? do_user_addr_fault+0x125/0x503 [ 0.403286] ? exc_page_fault+0x168/0x19e [ 0.403286] ? asm_exc_page_fault+0x22/0x30 [ 0.403286] ? write_profile+0x163/0x163 [ 0.403286] ? stack_trace_consume_entry+0x5/0x3c [ 0.403286] ? write_profile+0x163/0x163 [ 0.403286] arch_stack_walk+0xa3/0xda [ 0.403286] ? stack_trace_save+0x48/0x6a [ 0.403286] stack_trace_save+0x48/0x6a [ 0.403286] save_trace+0x60/0x27a [ 0.403286] mark_lock+0x108/0x357 [ 0.403286] ? desc_read+0x21/0xc5 [ 0.403286] ? insn_get_prefixes+0x17f/0x248 [ 0.403286] ? insn_get_opcode+0xd8/0x13a [ 0.403286] __lock_acquire+0x538/0x1108 [ 0.403286] ? skip_nops+0x40/0x8e [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] lock_acquire+0x12b/0x277 [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] ? insn_get_displacement+0x29/0x10a [ 0.403286] ? __copy_user_flushcache+0x1d/0x94 [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] __mutex_lock+0xbb/0x3ff [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] ? tracer_hardirqs_on+0x2c/0xd8 [ 0.403286] ? text_poke_early+0x85/0x95 [ 0.403286] ? _vm_unmap_aliases+0x58/0x203 [ 0.403286] _vm_unmap_aliases+0x58/0x203 [ 0.403286] ? __copy_user_flushcache+0x1d/0x94 [ 0.403286] change_page_attr_set_clr+0xc0/0x24f [ 0.403286] change_page_attr_set.constprop.0+0xf/0x15 [ 0.403286] set_memory_nx+0x27/0x2d [ 0.403286] free_init_pages+0x54/0x83 [ 0.403286] alternative_instructions+0xe1/0xf5 [ 0.403286] arch_cpu_finalize_init+0xca/0xeb [ 0.403286] start_kernel+0x588/0x610 [ 0.403286] x86_64_start_reservations+0x25/0x25 [ 0.403286] x86_64_start_kernel+0x73/0x73 [ 0.403286] secondary_startup_64_no_verify+0x166/0x16b [ 0.403286] [ 0.403286] Modules linked in: [ 0.403286] CR2: 0000000000000011 [ 0.403286] ---[ end trace 0000000000000000 ]--- [ 0.403286] RIP: 0010:stack_trace_consume_entry+0x5/0x3c [ 0.403286] Code: 48 89 d8 48 8b 54 24 08 65 48 2b 14 25 28 00 00 00 74 05 e8 f9 47 91 00 48 83 c4 10 5b 5d 41 5c c3 cc cc cc cc 0f 1f 44 00 00 <8b> 47 10 31 d2 3b 47 08 73 26 8b 57 0c 85 d2 74 09 ff ca 89 57 0c [ 0.403286] RSP: 0000:ffffffff82403a08 EFLAGS: 00010082 [ 0.403286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000003 [ 0.403286] RDX: 0000000000000004 RSI: 0000000000000003 RDI: 0000000000000001 [ 0.403286] RBP: ffffffff82403aa8 R08: 0000000000000000 R09: 0000000000000000 [ 0.403286] R10: 7574657220646574 R11: 7265766e6f636e55 R12: ffffffff824128c0 [ 0.403286] R13: ffffffff8117bdf0 R14: ffffffff82403ab8 R15: ffffffff83097580 [ 0.403286] FS: 0000000000000000(0000) GS:ffff88817b600000(0000) knlGS:0000000000000000 [ 0.403286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.403286] CR2: 0000000000000011 CR3: 000000000243c001 CR4: 0000000000770ef0 [ 0.403286] PKRU: 55555554 [ 0.403286] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.403286] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- -- Josh