20/03/2019 · Or you can disable retpoline under "Processor type and features" -> "Avoid speculative indirect branches in kernel", but in my very limited understanding this could. A retpoline-capable compiler can avoid generating any vulnerable indirect CALL or indirect JMP instructions and instead uses retpoline sequences. Of course, for code not generated by the compiler such as inline assembly programmers must insert retpoline sequences manually.
1.4 Retpoline Support Added to GCC 1.5 Shipped Kernels 1.6 Unbreakable Enterprise Kernel Release 2 1.7 Unbreakable Enterprise Kernel Release 4 1.8 Information About Feature Changes Introduced in Previous Oracle Linux 6 Updates 1.8.1 Ceph Support 1.8.2 OpenSCAP Support 1.8.3 Load Balancing and. Introduce the "retpoline" x86 mitigation technique for variant 2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre. Our compiler experts ported this support into the gcc-4.8 and gcc-4.4 compilers, and the compilers are available on yum. for public download. This was a prerequisite to making retpoline-enabled kernels available on Oracle Linux, which could use the compiler features to self-protect the kernel against the Spectre Variant 2 attacks. Recompilation of applications is not required.
On the other way, if you attempt to install a module compiled with a retpoline compiler on a non retpoline kernel, it just won't work correctly. This is the reason why PowerPath for Linux 6.4 and above can't be installed on a non retpoline kernel. > I don't think that this is a proper behavior. I suggest to allow compilation No, you asked for retpoline, and your compiler can not provide that, so erroring out is the correct behavior. It is worse for you to have an option enabled and it not being enabled just because your compiler does not support it. That way you do not have the false. Description of problem: Compilation error with kernel-3.10.0-867, CONFIG_RETPOLINE=y, but not supported by the compiler Version-Release number of selected component. Finally, the paper concludes by generalizing the attack to any non-functional state of the victim process. It briefly discusses even such highly non-obvious non-functional effects as bus arbitration latency. The basic difference between Spectre and Meltdown is that Spectre can be used to manipulate a process into revealing its own data.
If you build the kernel with the retpoline though, you can successfully load modules which aren't built with retpoline. Is there an easy and common/generic/unified way to check if kernel is "Retpoline" enabled or not? I want to do this so that my installer can use the proper build of kernel module to be installed. Kernel – GCC and ‘Retpoline’. Adventures With Linux ™ Posted on February 1, 2018 by RG February 1, 2018 The recent summary of Kernel 4.15 mentioned the test for ‘compliant’ versions of GCC which fully support the retpoline mitigation, but only gave an example of non-compliance. 05/12/2018 · Traditional retpoline would only be secure if all these drivers were recompiled with a new version of the compiler. Given the breadth of Windows 3rd party driver ecosystem, it is not realistic to expect all non-inbox 3rd party drivers to be recompiled and released to customers at the same time. Therefore, a Windows implementation of retpoline.
Appendix was added on the 14th of Febuary 2018, in response to comments made to me on twitter. In this connection "retpoline pause lfence" and "retpoline ud2" was added to the table. Other than that only typos where fixed since original post. Abstract In this blog post I explore the Retpoline. If I run on a hypervisor with retpoline enabled, is my VM protected? No. Retpoline immunises software that is compiled with it against attacks using Spectre variant 2, but non-retpolined software running on the same system is still vulnerable. A retpolined hypervisor cannot be attacked, but in most cases depending on how the hypervisor is.
15/03/2018 · On January 3rd, 2018, Microsoft released an advisory and security updates related to a newly discovered class of hardware vulnerabilities involving speculative execution side channels known as Spectre and Meltdown that affect AMD, ARM, and Intel CPUs to varying degrees. If you haven’t had a chance to learn about these issues, we. 12/05/2019 · So the only solution seems to pass by disabling the "retpoline" security measures of kernel 4.15.18-14-pve the PS part of my last post. But, as you can check, my attempts on that were unsuccessful during boot the "Spectre V2: Mitigation: Full AMD retpoline" keeps appearing! Any help on. Présentation. Devenir un partenaire. Si vous êtes un fournisseur d'hébergement dédié ou gérez un centre de données, rejoignez-nous pour assurer la sécurité et la stabilité de vos clients. “Retpoline” sequences are a software construct which allow indirect branches to be isolated from speculative execution. This may be applied to protect sensitive binaries such as operating system or hypervisor implementations from branch target injection attacks against their indirect branches.
On February 22, 2018, Canonical released similar kernel updates with compiler-based retpoline mitigation for Spectre Variant 2 on both 64-bit and 32-bit architectures for Ubuntu 14.04.5 LTS. The compiler-side work -- similar to GCC's Retpoline code -- is to avoid generating code where an indirect branch could have its prediction poisoned by a rogue actor. The Retpoline support uses indirect calls in a non-speculatable way.
First problem: I cannot compile the kernel with my version of compiler ~~~~ $ make defconfig Default configuration is based on 'i386_defconfig'. 00:00:12.765 --> 00:00:16.410 L’idée était de éliminer une grande classe de 00:00:16.410 --> 00:00:21.330 les attaques de tampon de branche indirecte C’est spectre était d’environ, 00:00.
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