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The ar, nm, and objdump used in FreeBSD do not support LLVM IR bitcode object files. One is hardlinked to another and the application changes behavior depending on arvgv ending in “ranlib”. In FreeBSD 12-CURRENT, ar and ranlib are known as “BSD ar” and “BSD ranlib.” In fact, ar and ranlib are the same applications. Commit f38b51668efcd53b8146789010611a4632cafade made the switch to ld.lld as the default linker while enabling non-Cross-DSO CFI at the same time.īuilding libraries in base requires applications like ar, ranlib, nm, and objdump. This also enabled ld.lld as the default linker in base since CFI requires lld.
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In March of 2017, we started compiling all applications with LTO and non-Cross-DSO CFI. Compiling with LTO produces intermediate object files as LLVM IR bitcode instead of ELF objects.
#AUDIO HIJACK 3 MANUAL CODE#
I remembered hearing a few years back that llvm developers were able to compile the entirety of FreeBSD’s source code with LTO. )ĬFI requires compiling source files with Link-Time Optimization (LTO).
#AUDIO HIJACK 3 MANUAL FULL#
We have made a lot of progress, yet we’re not even half-way there.īrace yourself: This article is going to be full of references to “Cross-DSO CFI.” Make a drinking game out of it. This article discusses where HardenedBSD stands with regards to Cross-DSO CFI in base. Supporting non-Cross-DSO CFI is an important initial milestone for supporting Cross-DSO CFI, or CFI applied to both shared libraries and applications. The term “non-Cross-DSO CFI” means that CFI is enabled for code within an application’s codebase, but not for the shared libraries it depends on. HardenedBSD supports non-Cross-DSO CFI in base for 12-CURRENT/amd64 and has it enabled for a few individual ports. Cross-DSO CFI builds upon ASLR and PaX NOEXEC for effectiveness. Backward-edge CFI support is gained via a tangential feature called SafeStack. The llvm compiler toolchain, included and used by default in HardenedBSD 12-CURRENT/amd64, supports forward-edge CFI. Today I will write about silent fanless FreeBSD desktop or server computer … or NAS … or you name it, it can have multa#HeadlinesĬontrol Flow Integrity, or CFI, raises the bar for attackers aiming to hijack control flow and execute arbitrary code. And don't forget to join the PhotoActive Facebook group to discuss the podcast, share your photos, and more.ĭisclosure: Sometimes we use affiliate links for products, in which we receive small commissions to help support PhotoActive.Control flow integrity with HardenedBSD, fixing bufferbloat with OpenBSD’s pf, Bareos Backup Server on FreeBSD, MeetBSD CfP, crypto simplified interface, twitter gems, interesting BSD commits, and more. If you like the show, please subscribe in iTunes/Apple Podcasts or your favorite podcast app, and please rate the podcast. If you’ve already subscribed, you’re automatically entered. Subscribe to the PhotoActive podcast newsletter at the bottom of any page at the PhotoActive web site to be notified of new episodes and be eligible for occasional giveaways. Kirk: Eyes Wide Open! 100 Years of Leica Photography.( View show notes with images at )Įpisode 92: Sensors and Megapixels with Richard Butler Follow the PhotoActive Instagram account.Kirk's website, Kirk's photos, Kirk on Instagram.
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Jeff's website, Jeff's photos, Jeff on Instagram.Why would someone pay for a camera that shoots only in black and white? In this episode, we talk about the advantages of a sensor without RGB, how shooting with the Q2 Monochrom is changing the way Kirk shoots, and processing the images in Capture One. The day has arrived: Kirk finally purchased his dream camera, the Leica Q2 Monochrom.