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Fri, 13 Jan 2023 16:08:22 +0000 From: Niklas Cassel To: Kees Cook CC: "linux-hardening@vger.kernel.org" , Miguel Ojeda , Siddhesh Poyarekar , Arnd Bergmann , Nick Desaulniers , Nathan Chancellor , Tom Rix , "llvm@lists.linux.dev" , Juergen Gross , Boris Ostrovsky , "linux-kernel@vger.kernel.org" , Damien Le Moal , "linux-next@vger.kernel.org" , "netdev@vger.kernel.org" , Michael Chan Subject: Re: linux-next - bnxt buffer overflow in strnlen Thread-Topic: linux-next - bnxt buffer overflow in strnlen Thread-Index: AQHZJ2lCUJqUxstXRUGtYPCc7p47dg== Date: Fri, 13 Jan 2023 16:08:21 +0000 Message-ID: References: <20220920192202.190793-1-keescook@chromium.org> <20220920192202.190793-5-keescook@chromium.org> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=wdc.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: MN2PR04MB6272:EE_|SN6PR04MB5054:EE_ x-ms-office365-filtering-correlation-id: a8936a0f-b8cc-48a8-01d6-08daf580648a wdcipoutbound: EOP-TRUE x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: =?us-ascii?Q?/74TWzJcKArVW5AihgLhUPAnLjcp7lOHBKLpMWu2xnm10xLXduK+ae6SyuA0?= =?us-ascii?Q?jzprF7WbcnyDPAC0Ddg4mgh0HasBeFdVOubwcyDR7xH/AuwGg98S1aDRayOa?= =?us-ascii?Q?deLr1KrDUTJXfbVlCnpyTEBFbF7zIVg2uhKEFU61AOa0FAsDXsffbPvROLgO?= =?us-ascii?Q?vwmTqwIIvhFAn4WAljjKUvU+VPKWy8pno24vsfnxhFUkdZHIsiUOq3npjHAA?= =?us-ascii?Q?Lx4ZjBG030GN00v2kwDtulFmBVfo6hnD3MmgCJ+jRnkGkF7efRbNtf2BVIoT?= =?us-ascii?Q?aWSdep2Fc6xBjI5sNVCj8sssyBgtaxQ8bad2Lb5BsG29Ni+z3+Fkr7dmPcgA?= =?us-ascii?Q?knIZk/AlOzNvemDH9LS73E1O9o9GXD/k3t/BnviC5vObaZ+JyjqKybXStj7/?= =?us-ascii?Q?faiXeaLhaqrjwLXv+7CBeNkySU+Qy21KsPmTo6/pJB30LFWZhN/bOezrSCYh?= =?us-ascii?Q?6XySiTMSSx59MU19zsouCTvTmZnXNuPUmRkPQtsLsFW5ExU4GCZxMV2lTpa8?= =?us-ascii?Q?Qhqcx2jBz2atGTDdBFuersox0yVkKfRQTt+0QKdwpYRKVyWLwWJSo2Goy1Cm?= =?us-ascii?Q?DKQesqg12kT/I7IKej2IgiraPoxboECgZh7xnTXENcEXZTPkndqNnMgZSPLD?= =?us-ascii?Q?3hcQxuk0Otfq52PU7jF2iVWpSj9RUKc7mHkzXCa+DOGSkX5UvvHwR8FejKKh?= =?us-ascii?Q?jrPiGvAbXpjpcf6+LD7abeYVlr3TbkoMDmPFzcidT7fCAO//5vWR/Mpvce+b?= =?us-ascii?Q?3/D7veK981n52lbD5Fv3HYqHrBXXtClT0Uskn1s18pkktuLBfhjMUW7R10Vp?= =?us-ascii?Q?/lDNcf+leoJyqRiGdtBq5/5itl61wMZeuK9uAQRBEg9R2DZcN0qEND6o2nFs?= =?us-ascii?Q?yFrnmfAeNc9FKRQ1KjyGbS7r7CTxzL36LjR/PFX1U5j5zw/7adb8ym0v2KQ0?= =?us-ascii?Q?/kEeKjwg+OXLPPr0wwOBSWtkwdkWN5k77X8CVNoIIvxL6qFjjhXXYRZAgP6R?= =?us-ascii?Q?gA75F38ZY/Z+jxmizuJdcS80LMpvgceLrXutyMdEUIfxIH7nB217x5xJEwx3?= =?us-ascii?Q?Cj8rtYs9Pno/nzs9RDQ7BtOTX90QpQ=3D=3D?= X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR04MB6272.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a8936a0f-b8cc-48a8-01d6-08daf580648a X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Jan 2023 16:08:21.7262 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: YPX955k+Trzm1KSVV1G4ukQErdrCrFOZ6//Ydl2GtIUHEITU2Cu0qI3B1gtvUzngeiTBEgJkuVLEIXLK/JFuvg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR04MB5054 On Fri, Jan 13, 2023 at 04:59:19PM +0100, Niklas Cassel wrote: > On Tue, Sep 20, 2022 at 12:22:02PM -0700, Kees Cook wrote: > > Since the commits starting with c37495d6254c ("slab: add __alloc_size > > attributes for better bounds checking"), the compilers have runtime > > allocation size hints available in some places. This was immediately > > available to CONFIG_UBSAN_BOUNDS, but CONFIG_FORTIFY_SOURCE needed > > updating to explicitly make use the hints via the associated > > __builtin_dynamic_object_size() helper. Detect and use the builtin when > > it is available, increasing the accuracy of the mitigation. When runtim= e > > sizes are not available, __builtin_dynamic_object_size() falls back to > > __builtin_object_size(), leaving the existing bounds checking unchanged= . > >=20 > > Additionally update the VMALLOC_LINEAR_OVERFLOW LKDTM test to make the > > hint invisible, otherwise the architectural defense is not exercised > > (the buffer overflow is detected in the memset() rather than when it > > crosses the edge of the allocation). > >=20 > > Cc: Miguel Ojeda > > Cc: Siddhesh Poyarekar > > Cc: Arnd Bergmann > > Cc: Nick Desaulniers > > Cc: Nathan Chancellor > > Cc: Tom Rix > > Cc: linux-hardening@vger.kernel.org > > Cc: llvm@lists.linux.dev > > Signed-off-by: Kees Cook > > --- >=20 > Hello Kees, >=20 > Unfortunately, this commit introduces a crash in the bnxt > ethernet driver when booting linux-next. >=20 > I haven't looked at the code in the bnxt ethernet driver, > I simply know that machine boots fine on v6.2.0-rc3, > but fails to boot with linux-next. >=20 > So I started an automatic git bisect, which returned: > 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when availabl= e") >=20 > $ grep CC_VERSION .config > CONFIG_CC_VERSION_TEXT=3D"gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4)" > CONFIG_GCC_VERSION=3D120201 >=20 > $ grep FORTIFY .config > CONFIG_ARCH_HAS_FORTIFY_SOURCE=3Dy > CONFIG_FORTIFY_SOURCE=3Dy >=20 >=20 > dmesg output: >=20 > <0>[ 10.805253] detected buffer overflow in strnlen > <4>[ 10.810683] ------------[ cut here ]------------ > <2>[ 10.816035] kernel BUG at lib/string_helpers.c:1027! > <4>[ 10.821753] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI > <4>[ 10.822737] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 6.2.0-rc3-nex= t-20230112+ #4 > <4>[ 10.834787] Hardware name: Supermicro Super Server/H12SSL-NT, BIOS = 2.4 04/14/2022 > <4>[ 10.839875] RIP: 0010:fortify_panic+0xf/0x11 > <4>[ 10.844962] Code: e0 e8 da 83 0a ff e9 31 45 6d ff 90 90 90 90 90 9= 0 90 90 90 90 90 90 90 90 90 90 48 89 fe 48 c7 c7 78 69 d6 9f e8 01 ea fc f= f <0f> 0b 48 8b 4c 24 18 48 8b 54 24 10 4c 8d 44 24 25 48 c7 c7 b6 69 > <4>[ 10.865321] RSP: 0018:ffffb547c005bb98 EFLAGS: 00010246 > <4>[ 10.870406] RAX: 0000000000000023 RBX: ffff94f0582bc400 RCX: 000000= 0000000000 > <4>[ 10.880584] RDX: 0000000000000001 RSI: 00000000ffffdfff RDI: 000000= 00ffffffff > <4>[ 10.885672] RBP: ffff94f0582bc424 R08: 0000000000000000 R09: ffffb5= 47c005ba60 > <4>[ 10.895849] R10: 0000000000000003 R11: ffffffffa0182448 R12: 696c66= 666f282074 > <4>[ 10.900937] R13: 736574206b636162 R14: 0000000000000001 R15: ffff94= f0545f8b40 > <4>[ 10.911113] FS: 0000000000000000(0000) GS:ffff950f07380000(0000) k= nlGS:0000000000000000 > <4>[ 10.916201] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > <4>[ 10.926382] CR2: 0000000000000000 CR3: 000000204c05a000 CR4: 000000= 0000350ee0 > <4>[ 10.931470] Call Trace: > <6>[ 10.936317] ata9: SATA link down (SStatus 0 SControl 300) > <4>[ 10.936745] > <4>[ 10.936745] bnxt_ethtool_init.cold+0x18/0x18 > <4>[ 10.936745] ? dma_pool_free+0x14d/0x160 > <6>[ 10.942591] ata10: SATA link down (SStatus 0 SControl 300) > <4>[ 10.942663] bnxt_fw_init_one_p2+0x18d/0x5e0 > <6>[ 10.949046] ata4: SATA link down (SStatus 0 SControl 300) > <4>[ 10.949841] bnxt_init_one+0x401/0xf10 > <6>[ 10.958451] ata6: SATA link down (SStatus 0 SControl 300) > <4>[ 10.958854] local_pci_probe+0x41/0x80 > <6>[ 10.968114] ata3: SATA link down (SStatus 0 SControl 300) > <4>[ 10.968892] pci_device_probe+0x1e2/0x210 > <6>[ 10.977259] ata8: SATA link down (SStatus 0 SControl 300) > <4>[ 10.977657] really_probe+0xde/0x380 > <6>[ 10.986406] ata5: SATA link down (SStatus 0 SControl 300) > <4>[ 10.986817] ? pm_runtime_barrier+0x50/0x90 > <4>[ 10.986817] __driver_probe_device+0x78/0x170 > <6>[ 10.996042] ata7: SATA link down (SStatus 0 SControl 300) > <4>[ 10.996978] driver_probe_device+0x1f/0x90 > <4>[ 10.996978] __driver_attach+0xd2/0x1c0 > <4>[ 10.996978] ? __pfx___driver_attach+0x10/0x10 > <4>[ 10.996978] bus_for_each_dev+0x65/0x90 > <4>[ 11.047368] bus_add_driver+0x1b1/0x200 > <4>[ 11.052640] driver_register+0x89/0xe0 > <4>[ 11.057487] ? __pfx_bnxt_init+0x10/0x10 > <4>[ 11.061634] bnxt_init+0x20/0x33 > <4>[ 11.065015] do_one_initcall+0x5b/0x340 > <4>[ 11.070105] ? rcu_read_lock_sched_held+0x3f/0x80 > <4>[ 11.075198] kernel_init_freeable+0x29e/0x2ee > <4>[ 11.080635] ? __pfx_kernel_init+0x10/0x10 > <4>[ 11.085379] kernel_init+0x16/0x140 > <6>[ 11.087743] ata16: SATA link down (SStatus 0 SControl 300) > <4>[ 11.086528] ret_from_fork+0x2c/0x50 > <4>[ 11.086528] > <6>[ 11.094437] ata17: SATA link down (SStatus 0 SControl 300) > <4>[ 11.094645] Modules linked in: > <4>[ 11.097999] ---[ end trace 0000000000000000 ]--- > <6>[ 11.100194] ata18: SATA link down (SStatus 0 SControl 300) >=20 >=20 > Kind regards, > Niklas +netdev +bnxt maintainers=