From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1523264738; cv=none; d=google.com; s=arc-20160816; b=f6s2QwDQzlxmt8I0R6Swt7SCoEcOpuiwGGvhdxj8SRtH62Vr605lDl2CBJwIfJh9hc 3cFAZCPeM6K3Z5ksrWySoQzSw4AuyujBBS7OfiNXnV/Xadbyca87o180DlMDE+Q3Tw1g cbNstyRO6rJObkaZNGy6K9Qr+eLLF0COUC1wvD2IrsUXDDFZN/0avYVG+69JgxxJBVKM hjNgAuM0Z63UyCZDNJWlaKpgu4bdwZgBV/Q2Vd09exlZqvpjokXrOB1LuwtdBPsDPRgD WjK3yvjVOH2WrLY6b5Ive1jZrR2oMIUIwMKI83HBea4bi3rqMVM4+NAThpUaGA5oiBcF MXvg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:reply-to:message-id:subject :cc:to:from:date:dkim-signature:arc-authentication-results; bh=Qh9ikWapoKoK7MzRZsKzdOhUQWfTGzdxcc18V9kX1G0=; b=YZ7T5neKLSOizlYyjRkTroAL98yHc/UbFZ3WZcbuMYxNcBVC5H64egudPquV5Q2wR2 cKkVTApcEXDpC+0fZvW8Lt5rxowU65QT0THeHAzXw/dM8tt4MROvxbsO9k3h9koWN2ph 5E61rDN8urejnBYIN9w0GtYb5yCdgeerpULFkC7GTj+/z65HOhxozxbGqMexlxH6U3Zm IDpf4vOHjtU+3p2QT933j/idoksheH7YEVqXeBX009HfZdXZGPrf0/4LNbL54eqWFSxb YJSvW0NDTCj0lr/pS4zH/bC39Qk2QpdvwyCWy9alYRWNIHkfwwF0P/wEkyG57TLvEMkH k5WQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@essential-com.20150623.gappssmtp.com header.s=20150623 header.b=dxor5aA2; spf=pass (google.com: domain of jb@essential.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jb@essential.com Authentication-Results: mx.google.com; dkim=pass header.i=@essential-com.20150623.gappssmtp.com header.s=20150623 header.b=dxor5aA2; spf=pass (google.com: domain of jb@essential.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jb@essential.com X-Google-Smtp-Source: AIpwx4+dFvnT3wHxLLqVDcBJf3gTzxUAOxeIHy5hsjn0X9KPhQExqM3iUqjM+UWpOaWutxKCzPqvmQ== Date: Mon, 9 Apr 2018 18:05:34 +0900 From: Jean-Baptiste Theou To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, will.deacon@arm.com, dan.rue@linaro.org Subject: Linux 4.9.93 Message-Id: <20180409180534.1768583293d0abe207168c5a@essential.com> Reply-To: 20180408150840.GA16019@kroah.com X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1597258846269332204?= X-GMAIL-MSGID: =?utf-8?q?1597258846269332204?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Hi, After this patchset, a kernel built with CFI fails. Disabling UNMAP_KERNEL_AT_EL0 fix the issue obviously. Wondering if there is one of the test suite used on the review patchset that covers the CFI usecase. Best regards, [ 0.249191] CPU features: detected feature: GIC system register CPU interface [ 0.256391] CPU features: detected feature: Privileged Access Never [ 0.262719] CPU features: detected feature: User Access Override [ 0.268791] CPU features: detected feature: 32-bit EL0 Support [ 0.274683] CPU features: detected feature: Kernel page table isolation (KPTI) [ 0.282166] CFI failure: [ 0.282169] CFI failure: [ 0.282172] CFI failure: [ 0.282173] CFI failure: [ 0.282175] CFI failure: [ 0.282176] CFI failure: [ 0.282177] CFI failure: [ 0.282178] CFI failure: [ 0.282188] ------------[ cut here ]------------ [ 0.282189] ------------[ cut here ]------------ [ 0.282190] ------------[ cut here ]------------ [ 0.282191] ------------[ cut here ]------------ [ 0.282193] ------------[ cut here ]------------ [ 0.282196] kernel BUG at kernel/cfi.c:32! [ 0.282198] ------------[ cut here ]------------ [ 0.282201] kernel BUG at kernel/cfi.c:32! [ 0.282202] ------------[ cut here ]------------ [ 0.282204] kernel BUG at kernel/cfi.c:32! [ 0.282207] kernel BUG at kernel/cfi.c:32! [ 0.282209] kernel BUG at kernel/cfi.c:32! [ 0.282211] kernel BUG at kernel/cfi.c:32! [ 0.282214] kernel BUG at kernel/cfi.c:32! [ 0.282215] ------------[ cut here ]------------ [ 0.282216] kernel BUG at kernel/cfi.c:32! [ 0.282218] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 0.282224] Modules linked in: [ 0.282230] CPU: 2 PID: 25 Comm: migration/2 Not tainted 4.9.93-perf+ #39 [ 0.282232] Hardware name: [ 0.282235] task: fffffffbb3b36580 task.stack: fffffffbb30cc000 [ 0.282250] PC is at __cfi_check_fail+0x14/0x1c [ 0.282253] LR is at __cfi_check_fail+0x14/0x1c [ 0.282255] pc : [] lr : [] pstate: 60c00085 [ 0.282256] sp : fffffffbb30cfc30 [ 0.282259] x29: fffffffbb30cfc30 x28: ffffff93b6415000 [ 0.282261] x27: 00000013b65c1000 x26: ffffff93b5ce6000 [ 0.282264] x25: ffffff93b5ce6000 x24: ffffff93b6419000 [ 0.282266] x23: ffffff93b65c1000 x22: ffffff93b65c4000 [ 0.282268] x21: 9d12f8172cb2f296 x20: 000000008180e3e0 [ 0.282271] x19: 0000000000000000 x18: 000000000000002c [ 0.282274] x17: 00000000000fd054 x16: 0000000000000000 [ 0.282276] x15: ffffff93b65ec000 x14: 000000000000000c [ 0.282279] x13: 0000000000000004 x12: 0000000000000000 [ 0.282281] x11: 0000000000000000 x10: 0000000001440144 [ 0.282283] x9 : 260822e8751d5000 x8 : 260822e8751d5000 [ 0.282286] x7 : 0000000000000000 x6 : fffffffbbac75b60 [ 0.282288] x5 : 0000000000000000 x4 : 0000000000000000 [ 0.282290] x3 : 000000003a657275 x2 : 0000000000000000 [ 0.282292] x1 : 0000000000000000 x0 : 000000000000000c [ 0.282294] [ 0.282294] PC: 0xffffff93b3f03d50: [ 0.282308] 3d50 b9001ac8 f94002c8 370ffec8 17ffffbe d4210000 14000000 aa1603e0 f90007e8 [ 0.282315] 3d70 94536017 f94007e8 17ffffe2 a9bf7bfd 910003fd d000d100 913ee400 94533cc7 [ 0.282322] 3d90 d4210000 14000000 b0013788 2a1f03e0 f901c51f d65f03c0 f940406b 2a0203e8 [ 0.282329] 3db0 2a0103e9 aa0003ea b400008b f9000145 f94000cb b40001ab a9bf7bfd 910003fd [ 0.282330] [ 0.282330] LR: 0xffffff93b3f03d50: [ 0.282336] 3d50 b9001ac8 f94002c8 370ffec8 17ffffbe d4210000 14000000 aa1603e0 f90007e8 [ 0.282343] 3d70 94536017 f94007e8 17ffffe2 a9bf7bfd 910003fd d000d100 913ee400 94533cc7 [ 0.282350] 3d90 d4210000 14000000 b0013788 2a1f03e0 f901c51f d65f03c0 f940406b 2a0203e8 [ 0.282357] 3db0 2a0103e9 aa0003ea b400008b f9000145 f94000cb b40001ab a9bf7bfd 910003fd [ 0.282358] [ 0.282358] SP: 0xfffffffbb30cfbf0: [ 0.282365] fbf0 b3f03d90 ffffff93 b30cfc30 fffffffb b3f03d90 ffffff93 60c00085 00000000 [ 0.282372] fc10 b6415000 ffffff93 b642fa00 ffffff93 ffffffff ffffffff b3f03d90 ffffff93 [ 0.282378] fc30 b30cfc70 fffffffb b3d458c0 ffffff93 00000080 00000000 00000001 00000000 [ 0.282385] fc50 b65c4000 ffffff93 b64420f0 ffffff93 8180e3e0 00000000 00000002 00000000 [ 0.282387] Process migration/2 (pid: 25, stack limit = 0xfffffffbb30cc000) [ 0.282389] Call trace: [ 0.282391] Exception stack(0xfffffffbb30cfb00 to 0xfffffffbb30cfc30) [ 0.282395] fb00: 000000000000000c 0000000000000000 0000000000000000 000000003a657275 [ 0.282397] fb20: 0000000000000000 0000000000000000 fffffffbbac75b60 0000000000000000 [ 0.282400] fb40: 260822e8751d5000 260822e8751d5000 0000000001440144 0000000000000000 [ 0.282403] fb60: 0000000000000000 0000000000000004 000000000000000c ffffff93b65ec000 [ 0.282405] fb80: 0000000000000000 00000000000fd054 000000000000002c 0000000000000000 [ 0.282408] fba0: 000000008180e3e0 9d12f8172cb2f296 ffffff93b65c4000 ffffff93b65c1000 [ 0.282411] fbc0: ffffff93b6419000 ffffff93b5ce6000 ffffff93b5ce6000 00000013b65c1000 [ 0.282413] fbe0: ffffff93b6415000 fffffffbb30cfc30 ffffff93b3f03d90 fffffffbb30cfc30 [ 0.282416] fc00: ffffff93b3f03d90 0000000060c00085 ffffff93b6415000 ffffff93b642fa00 [ 0.282418] fc20: ffffffffffffffff ffffff93b3f03d90 [ 0.282421] [] __cfi_check_fail+0x14/0x1c [ 0.282430] [] name_to_dev_t+0x0/0x47c [ 0.282436] [] kpti_install_ng_mappings+0x178/0x2e0 [ 0.282443] [] multi_cpu_stop+0x114/0x170 [ 0.282445] [] cpu_stopper_thread+0x128/0x2e8 [ 0.282452] [] smpboot_thread_fn+0x230/0x558 [ 0.282455] [] kthread+0x21c/0x238 [ 0.282459] [] ret_from_fork+0x10/0x20 [ 0.282464] Code: 910003fd d000d100 913ee400 94533cc7 (d4210000)