From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1523267378; cv=none; d=google.com; s=arc-20160816; b=aivUoKGK0q9ZtGK98OrLaFAJV1Mw7uxbPeCYjh4cTYHAQZCatCDMYMDK8DuiGzcJdm xrNyJT045c1nS4TatoWLeG8NkKdApII37em/Br6HFfl4MDkU/UrzGT6Og345s06xHe9Y z5Iih5UH7BcVpUVvmIdQN10Ery/RR1E6S9S/hOTDGKgR76jnDVyoNA4PBHl/gYIVQlVb n8sfdrRRMxluInexMJ0ix8aZmsgt6bAX6nR864MIech7nJbsAmVYlsbGPQPAIjAj20RG 8kOknbT6RqtSLxQ89mCzfBKLEsZWbj0WuIe3TUQ5W37tgVfSPbFOS1rhT5je59UknYfq owpw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:dkim-signature:arc-authentication-results; bh=A28V224YHrxkWhzHMf2+MpjQpAX7LFt0eJe2sclGlQQ=; b=iExHONe+DzYTmUktLQGreDzBIi2HEn8Lj1SxCz3NyIG15T1oL9O4dcCgoHdn3BApnU y5VkShAlbtEAToy0Op/SSLwFDi0PeV7nHnKFJIBcT2lYlTUfLMsZZif8aGpDVZCHqVRU mzNbaVuhcGD2YhMFvrfhgrc0BBaOxUJIqlU60o/oWvCg0jEVW3SXnL3TDyqkdFVNZLsM ptnr5L/Z8hFcA7rfw/G88JVH9Sv7NUuAoZ4HM78PAlJTJcsYrOwFONj6U/9UDXFgf1jA 16QZLchnkxAwlgWhIfcGNEICVukmRdU/D51enVJpkbk52LxiAlhkteeS+8Y5J3G80210 jTvg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=f8IsvnqI; spf=pass (google.com: domain of ard.biesheuvel@linaro.org designates 209.85.220.41 as permitted sender) smtp.mailfrom=ard.biesheuvel@linaro.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=f8IsvnqI; spf=pass (google.com: domain of ard.biesheuvel@linaro.org designates 209.85.220.41 as permitted sender) smtp.mailfrom=ard.biesheuvel@linaro.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org X-Google-Smtp-Source: AIpwx4/yhpgBB43lFsQN9LZLeaOxjpjhlfaNLUW33FlWOrAOfjXxPMxUQGOMXWZWHOWiedzl0jzTOo6gTqKhlJ0saCU= MIME-Version: 1.0 In-Reply-To: <20180409093028.GA3398@kroah.com> References: <20180409180534.1768583293d0abe207168c5a@essential.com> <20180409093028.GA3398@kroah.com> From: Ard Biesheuvel Date: Mon, 9 Apr 2018 11:49:37 +0200 Message-ID: Subject: Re: Linux 4.9.93 To: Greg KH Cc: Jean-Baptiste Theou , Mark Rutland , Linux Kernel Mailing List , Will Deacon , Dan Rue , Mark Brown , Marc Zyngier , Greg Hackmann Content-Type: text/plain; charset="UTF-8" X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1597258846269332204?= X-GMAIL-MSGID: =?utf-8?q?1597261614606908650?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 9 April 2018 at 11:30, Greg KH wrote: > On Mon, Apr 09, 2018 at 06:05:34PM +0900, Jean-Baptiste Theou wrote: >> Hi, >> >> After this patchset, a kernel built with CFI fails. Disabling >> UNMAP_KERNEL_AT_EL0 fix the issue obviously. How does one 'build a kernel with CFI' for arm64? > > Is this a "clean" 4.9.93 tree or a "4.9.93 merged into > android-common-4.9? > >> 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) > > Oh fun :( > > Dragging in a bunch more people to the cc: and to: lines to have them > look at this... > > thanks, > > greg k-h