Date: Tue, 5 Sep 2017 09:45:48 -0700 From: Tony Lindgren <tony@...mide.com> To: Ard Biesheuvel <ard.biesheuvel@...aro.org> Cc: linux-arm-kernel@...ts.infradead.org, kernel-hardening@...ts.openwall.com, Arnd Bergmann <arnd@...db.de>, Nicolas Pitre <nico@...aro.org>, Russell King <linux@...linux.org.uk>, Kees Cook <keescook@...omium.org>, Thomas Garnier <thgarnie@...gle.com>, Marc Zyngier <marc.zyngier@....com>, Mark Rutland <mark.rutland@....com>, Matt Fleming <matt@...eblueprint.co.uk>, Dave Martin <dave.martin@....com> Subject: Re: [PATCH v2 00/29] implement KASLR for ARM Hi, * Ard Biesheuvel <ard.biesheuvel@...aro.org> [170903 05:08]: > This series implements randomization of the placement of the core ARM kernel > inside the lowmem region. It consists of the following parts: > > - changes that allow us to build vmlinux as a PIE executable which retains > the metadata required to fix up all absolute symbol references at runtime > - changes that eliminate absolute references from low-level code that may > execute with the MMU off: this removes the need to perform explicit cache > maintenance after the absolute references have been fixed up at runtime with > the caches enabled > - changes to the core kernel startup code to take the physical offset into > account when creating the virtual mapping (the pa-to-va mapping remains > unchanged) > - changes to the decompressor to collect some pseudo-entropy, and randomize > the physical offset of the decompressed kernel, taking placement of DTB, > initrd and reserved regions into account > - changes to the UEFI stub code to choose the KASLR offset and communicate > it to the decompressor > > To test these changes, boot a multi_v7_defconfig+CONFIG_RANDOMIZE_BASE=y I gave a quick try using your arm-kaslr-v3 branch, hopefully that's the right one. The good news is that now omap3 boots with omap2plus_defconfig with and without CONFIG_RANDOMIZE_BASE=y and I did not see any compiler errors with my gcc 6.2.0 like earlier :) I did see boot attempts fail with randomize enable where no output was produced. It seems this is happening for me maybe 1 out of 5 boots. Enabling DEBUG_LL did not show anything either. Then loading modules with CONFIG_RANDOMIZE_BASE=y seems to fail with: $ sudo modprobe rtc-twl rtc_twl: disagrees about version of symbol module_layout modprobe: ERROR: could not insert 'rtc_twl': Exec format error Regards, Tony
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