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Fri, 13 Jan 2023 15:59:22 +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" Subject: linux-next - bxnt buffer overflow in strnlen Thread-Topic: linux-next - bxnt buffer overflow in strnlen Thread-Index: AQHZJ2f/gKNU+8M62UeB3Fw1KFx0nQ== Date: Fri, 13 Jan 2023 15:59:21 +0000 Message-ID: References: <20220920192202.190793-1-keescook@chromium.org> <20220920192202.190793-5-keescook@chromium.org> In-Reply-To: <20220920192202.190793-5-keescook@chromium.org> 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_|CH0PR04MB8196:EE_ x-ms-office365-filtering-correlation-id: 3d6e4bd7-47a9-48e5-810f-08daf57f22af 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?kdIRrbjXpXuVCWL/zVx1W13u+KsYNBxAirQZJ+7Xa+m/lamnSPIdN4cE0nvm?= =?us-ascii?Q?lF0IcI7Gw7dUIrwOijmMulQyB/jI7A2SA0s9Q9skvP8aj35rFM7LoHafbQHS?= =?us-ascii?Q?zHKGjlgwvypBWTVQk87ejxcsVNMRwRBYP5JOd95nWtsrujmjh/DfV7AqEZ5K?= =?us-ascii?Q?yN/uW8ODiRYruKsH+Em9Smcu/43uZx3+siEVd3TZfypMtgYH4mQqzuFRlC+e?= =?us-ascii?Q?VaFSWASb24JMtj8x7005IIas12De6B+CMfPYCOz/3/PAsEQhycEyMWnhYHcr?= =?us-ascii?Q?ODb+TWIqsXM4ehEelEXSc7SewzcYSMI/B1gvEIaJJAiJ1tcR85YQ5aQUN5dd?= =?us-ascii?Q?tY84D8efL9B038RnggGrnErC9vSozMZ2lK6LljCZIpWdneObDpAHwnPMeabH?= =?us-ascii?Q?owtp8x7I/zBj/DK9nA+xWPCyinddf8vwSy3/+X6RAL5hhPl1rp4pii74dXW+?= =?us-ascii?Q?jag4qfZvyIQZTt5ueu4E9HVQYx0hYkwKXDLW86XtFi5HnTtAPRb5vLxiz8P+?= =?us-ascii?Q?PWDQ8GT8qYThxr7J4KRoyOLoUC4D3fFbo9sUPLPzeV7mT9oW9Bj6H88F7wr1?= =?us-ascii?Q?CnoQi935WNf8tewA9L5/C26MivlSJEDR0fIEirl+kUOO2boEC50g/dCO/gzT?= =?us-ascii?Q?j/nM/PKxCz1Up9raxfFFCimnLgJbetWfaRGBsMo/QD00uDQvw1JyhjkIldB8?= =?us-ascii?Q?AzGfJ5f99OvpLVtwd60iHScBupvNW1YiHsevqPayaDr54RfNDAP2YDnh10rK?= =?us-ascii?Q?jZpIZIDHqyk7Gq0D2cCVVpPxd+T+ErwI2clVp88uI8o6NXtA9Mtm8iOWeG2y?= =?us-ascii?Q?LZHS+vzPax6wsQJr3zBy3WzCl9Z1PjniosmmtsA4S6h4qD7rHKbg+DeODqaz?= =?us-ascii?Q?TSW2a5pk/jb8asDPpKc7jap7DwRHX07lp0KVQhRtCieVoLwp5XPwJHYbsdvw?= =?us-ascii?Q?31InQk+M1nV9T4jBL+SZDjFFrTzhXaYbNg4n9kBjoNCy/AdJbUJhSeLqaMy5?= =?us-ascii?Q?YHkAU1e/J3FaCfZW8+OIbBngxI8uha4WWgO5RcFG14M60E0=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: 3d6e4bd7-47a9-48e5-810f-08daf57f22af X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Jan 2023 15:59:21.7300 (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: 9ToNCJF0pE/giLIq6OlQzNiT7DYgukXtqjC4yZJAXikLNZ8HH18SeH6KvpNAR63jZJ3MqI0qMo7wlBqxFPa6jg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR04MB8196 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 runtime > 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 > --- Hello Kees, Unfortunately, this commit introduces a crash in the bxnt ethernet driver when booting linux-next. I haven't looked at the code in the bxnt ethernet driver, I simply know that machine boots fine on v6.2.0-rc3, but fails to boot with linux-next. So I started an automatic git bisect, which returned: 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when available"= ) $ 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 $ grep FORTIFY .config CONFIG_ARCH_HAS_FORTIFY_SOURCE=3Dy CONFIG_FORTIFY_SOURCE=3Dy dmesg output: <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-next-= 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 90 = 90 90 90 90 90 90 90 90 90 90 48 89 fe 48 c7 c7 78 69 d6 9f e8 01 ea fc ff = <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: 00000000= 00000000 <4>[ 10.880584] RDX: 0000000000000001 RSI: 00000000ffffdfff RDI: 00000000= ffffffff <4>[ 10.885672] RBP: ffff94f0582bc424 R08: 0000000000000000 R09: ffffb547= c005ba60 <4>[ 10.895849] R10: 0000000000000003 R11: ffffffffa0182448 R12: 696c6666= 6f282074 <4>[ 10.900937] R13: 736574206b636162 R14: 0000000000000001 R15: ffff94f0= 545f8b40 <4>[ 10.911113] FS: 0000000000000000(0000) GS:ffff950f07380000(0000) knl= GS:0000000000000000 <4>[ 10.916201] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 10.926382] CR2: 0000000000000000 CR3: 000000204c05a000 CR4: 00000000= 00350ee0 <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) Kind regards, Niklas=