Amd rdrand bug Short circuiting to RDRAND arguably breaks the API contract, but when RDRAND actually produces random-ish values it is probably good enough. /test-rdrand 能够输出 20 条 RDRAND 取值，如果大家在测试中发现自己总是得到相同的值集，那么无论其看起来是否随机，都表明你已经成为这项 bug 的受害者！ rdrand-test. RDRAND is an instruction that has been around since Broadwell. That's problematic. RDRAND[bit 30] = 1 ^ AMD64 Architecture Programmer’s Manual Volume 3: General-Purpose and System Instructions (PDF). The rdrand and rdseed assembly instructions are used to generated random numbers, which are then fed into a subclass of the standard Random class of the random module. No description defined. They need to do it for Zen 3 now. I wondered if it might be, so I straced the process and it didn't seem to be making a system call, i. The library uses RDRAND and RDSEED x86 instructions provided by AMD hardware. Auto-Detect and Install Driver Updates for AMD Radeon™ Series Graphics and Ryzen™ Chipsets For use with systems running Windows® 11 / Windows® 10 64-bit version 1809 and later. /amd-rdrand-bug Your RDRAND() does not have the AMD bug. This bug report chronicles what's wrong with RdRand on the affected processors, as does this Linux kernel bugzilla thread. AMD Zen also supports it. Messing up RDRAND like this affects a lot more people than TSX. By avoiding RdRand usage on the system RDRAND 是一个计算机指令，用于从芯片上的硬件随机数生成器中获取随机数。所用到的随机数生成器由芯片上的熵池初始化。 RDRAND指令在Ivy Bridge架构处理器上可用，该指令也是X86-64和IA-32指令集的一部分。AMD在2015年6月添加了对RdRand指令的支持。 All Intel processors that support the RDRAND instruction indicate the availability of the RDRAND instruction via reporting CPUID. Modern x86_64 CPUs—beginning with Intel's Broadwell and AMD's Zen architectures—are supposed to have high-quality onboard random number generators (RNGs), which use thermal "noise" to very rapidly offer high-entropy pseudorandom numbers to anybody with kernel-level access who wants it. The CPUID instruction can be used on both AMD and Intel CPUs to check whether the RDRAND instruction is supported. AMD Ryzen RDRAND bug. 0. 26. 问题背景. [root@node1 ~] # . fr) Manufacturer ID: AuthenticAMD Processor Brand: AMD Ryzen 9 3900X 12-Core Processor. Apart from the fa 存在 bug 的代码会对 RDRAND 指令做出错误的响应，而这个 bug 之所以非常严重，则需要从 RDRAND 说起。 事实上，从英特尔的Broadwell以及AMD Zen架构开始，现代x86_64 CPU必须内置高质量的板载随机数生成器（RNG），负责利用热“噪声”快速向具有内核级访问权限的用户 Mar 30, 2021 · 血泪控诉：曝光数月的AMD代码bug毁掉了我的周末，AMD的微代码bug问题非常严重Ryzen3000的RDRAND函数（本应成为一款高质量的伪随机数生成器）每次都会返回0xFFFFFFFF，修复过程也是相当煎熬。 Feb 5, 2025 · Google security researchers, credited with finding and reporting this flaw to AMD, have also shared a proof-of-concept (PoC) exploit (tested on AMD EPYC and AMD Ryzen 9 CPUs) that shows how Nov 1, 2019 · 通过. Sleep bug isn't exclusive to AMD, just to hardware thay didn't recieve fixes for it. Date reported: September 25, 2024 Date fixed: December 17, 2024 Date disclosed: February 3, 2025. The result is that newer distributions - with the exception of Debian 10 - will simply fail to boot on Ryzen 3000 series CPUs due to a bug in those CPUs which causes them to fail to produce random data when RDRAND is called early in the boot process. RinCat Member Registered: 2016-02-23 Posts: 4. tl;dr There was a bug in AMD microcode that caused the RDRAND instruction to return 0xFFFFFFFF every time (not so random). I would not leave it on 1201. I can't remember the exact vulnerability affecting Zen and Zen+, but AMD's response was basically "hey look, it's been completely fixed with Zen 2, so you should upgrade to Zen 2. instance of. e. The failure to This solved the immediately visible problems caused by the AMD RDRAND bug on these APUs but it never fixed the underlying problem. AMD asset Tom Lendacky submitted a patch which makes the kernel as well as user-space programs believe that AMD family 15h and 16h APUs and CPUs don't support RDRAND at all on August 14th. Also see the following bug reports and patches. Thanks to a bug related to the hardware RDRAND instruction, systemd on some current Linux distros fails to run, while Destiny 2 refuses to open. [11] RDSEED availability can be checked on Intel CPUs in a similar manner. 10. Feb 14, 2022 · Hi, Recently I discovered my 5 years old cpu (Ryzen 7 1800X) had the infamous "linux bug" so I had to buy a new one (Ryzen 7 3800XT) which is compatible with my old motherboard (MSI X370 XPower Titanium) just to discover that the Ryzen 7 3000 series CPUs come with the "rdrand" bug. The RNG is designed to produce fast, high quality random numbers for use by the AMD Secure Processor as well as x86 software. # . However, early build date first gen Ryzen chips were affected by a segfault bug. Nobody trusts it. While first reported in 2014, AMD did not diagnose and offer a patch until late 2019. hardware security bug. get_random_u32() which is the function in question uses RDRAND if ut is available regardless of what RANDOM_TRUST_CPU says. （原始内容存档 (PDF) 于2017-12-22）. \n\n");. zip: 网页链接 May 10, 2020 · What is RDRAND? As a broad overview, RDRAND is a method of returning pseudo-random numbers from the CPU. The RDRAND CPU in instruction on AMD 3000 series CPUs is just plain broken. AMD got away with their bug in their own lab, because nobody trusts it (apart from recent systemd, which trusts it even to deliver a nonce, which was never part of the promise). Mar 7, 2025 · When the bug was first revealed, AMD's bulletin focused on EPYC server-grade CPUs and how bad actors could make secure links to remote client PCs accessing a larger server lose their SEV-based These problematic AMD APUs will happily report a CF flag of 1 indicating that RDRAND is working and still return 0xFFFFFFFFFFFFFFFF. 在AMD和Intel的CPU上，可以使用CPUID指令来检测CPU是否支持RDRAND指令。如果支持该指令，调用CPUID的01号标准函数之后，ECX寄存器的第30位会被 RDRAND on Intel doesn't have the bug, it's an AMD only bug in RDRAND - which is why AMD aren't totally excused. hardware bug. TSX is much much more complicated and prone to bugs in implementation. 0 hardware included in the AMD RYZEN and EPYC processors. In this case, OpenSSL was failing to generate keys after a kernel suspend/resume. Oct 29, 2019 · AMD responded to the bug in July. 42 votes, 27 comments. Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon, Zen4, RDNA3, EPYC, Threadripper, rumors, reviews, news and more. 在使用国产海光CPU Hygon C86 7265的服务器上部署K8S集群时，出现calico-node启动失败，相关日志如下： [root@node1 ~]# kubectl get pod -A -owide NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE kube-system calico-kube-controllers-7c7986989c-bwvw4 0/1 Pending 0 5m11s <none> <none> kube-system calico-node-v64fv 0/1 CrashLoopBackOff 5 5m11s 10. central processing unit. 从 RDRAND 开始. Not long after the Ryzen 3000-series # . Dec 21, 2019 · About a year ago, I acquired a threadripper based desktop computer, the hardware details of which are: Samsung 970 EVO Plus 500GB - Solid state drive ASRock X399M TAICHI (latest firmware) Gigabyte We would like to show you a description here but the site won’t allow us. Similar to software, implementing complex hardware correctly is challenging; historically, this has led to multiple well-known bugs, such as the Intel FDIV bug on Feb 14, 2022 · Hi, Recently I discovered my 5 years old cpu (Ryzen 7 1800X) had the infamous "linux bug" so I had to buy a new one (Ryzen 7 3800XT) which is compatible with my old motherboard (MSI X370 XPower Titanium) just to discover that the Ryzen 7 3000 series CPUs come with the "rdrand" bug. – On another note, has anyone actually shown that the Destiny 2 issue is caused by the RDRAND bug? AMD kind of implied that it was the same when the announced the BIOS fix, but obviously if there were a separate CPU bug they wouldn't want to be shouting about it. Features: ABM ADX AES AVX AVX2 BMI1 BMI2 CLFSH CMPXCHG16B CX8 F16C FMA FSGSBASE FXSR LAHF MMX MMXEXT MONITOR MOVBE MSR OSXSAVE PCLMULQDQ POPCNT RDRAND RDSEED SEP SHA SSE SSE2 SSE3 SSE4. 0 references. I have the unfortunate duty of reporting to you, three months later, that it is not. \n" "If the numbers generated appears to be similar, the RDRAND instruction is \nbroken. \n\n"); Feb 4, 2025 · Intel, AMD engineers rush to save Linux 6. There was a bug in RDRAND instruction affecting mostly SystemD, but its gone since AGESA 1. [Regression Potential] * The fix itself is very small, it ignores known to be faulty random values returned by the rdrand instruction and use a different random source. The theoretical security implications will still affect Nov 6, 2019 · 存在 bug 的代码会对 RDRAND 指令做出错误的响应，而这个 bug 之所以非常严重，则需要从 RDRAND 说起。 事实上，从英特尔的 Broadwell 以及 AMD Zen 架构开始，现代 x86_64 CPU 必须内置高质量的板载随机数生成器（RNG），负责利用热“噪声”快速向具有内核级访问权限的 56310 Rev. it's using the RDRAND instruction directly. Aug 15, 2019 · Not directly related to the recent AMD Zen 2 BIOS update needed to fix an RdRand problem (though somewhat related in that the original systemd bug report for faulty AMD RdRand stems from these earlier CPUs), but AMD has now decided to no longer advertise RdRand support for Family 15h (Bulldozer) and Family 16h (Jaguar) processors under Linux. If you are a Windows user, you can still be affected by this bug, you’re just less likely to notice. /amd-rdrandbug 命令，用户可以查看自己的系统是否存在这一特定 bug。. One serious fault that has surfaced deals with random numbers. 在amd和intel的cpu上，cpuid指令都可以检测中央处理器（cpu）是否支持rdrand 指令。如果支持，调用cpuid的标准函数01h之后，ecx寄存器的第30位会被设置成1 [10] 。amd处理器也可以使用同样的方式检测是否支持 [11] 。在intel cpu上，也可以使用类似的方法检测rdseed是否支持。 Jul 8, 2019 · [Impact] * Systems with AMD Ryzen 3000 series CPUs don't boot. So I'd like to know if this may actually be a bug on the kernel side. It is an old bug. By avoiding RdRand usage on the system Aug 8, 2023 · AMD Linux 工程师 Marion Limonciello 编写了合并补丁，IT之家附主要内容如下： 当 CPU 已经支持 RDRAND 指令时，TPM RNG 功能对于熵来说是不必要的。TPM RNG 功能以前在 AMD fTPM 系列的一个子集上被禁用，但报告继续显示一些系统上的问题，导致 TPM RNG 的功能成为卡顿根源。 (In reply to Richard Biener from comment #1) > Isn't this worked around at kernel level by disabling RDRAND support on > affected CPUs? Not sure. "So rdrand — and rdseed in particular — can be rather slow, but I think we're talking hundreds of CPU cycles — maybe low thousands. Google notified AMD of this vulnerability on September 25, 2024. Statements. Cheers, Charo 原標題：血淚控訴：曝光數月的AMD 微代碼 bug 毀掉了我的週末 來源：騰訊新聞 作者丨Jim Salter 譯者丨核子可樂 策劃丨張之棟、蔡芳芳 AMD 公司發佈的 Ryzen 3000 處理器中，存在一項與隨機數生成器相關的嚴重微代碼 bug。也正是因爲這個早已曝光數月卻沒有得到有效解決的「錯誤」，本篇文章的主人公 The last bug fix let me use the Steam Overlay without crashing, but the AMD in-game overlay, RTSS, M$ Game Bar, and any others you use can cause issues. 在amd和intel的cpu上，cpuid指令都可以检测中央处理器（cpu）是否支持rdrand 指令。 如果支持，调用cpuid的标准函数01h之后，ecx寄存器的第30位会被设置成1 [10] 。 Jan 5, 2020 · They probably are, but Ryzen isn't perfect. 2-1 Used distribution Arch Linux Linux kernel version used (uname -a) 5. Unfortunately, unpatched Ryzen 3000 says "y 42 votes, 27 comments. 120 RdRand is a Python module that provides an easily used interface to the random number generator provided by Intel (and some Amd) processors. Windows-Benutzer konnten das Spiel Destiny 2 (aufgrund eines Power-Management-Bugs) nicht erfolgreich starten. 5-arch1-1 CPU architecture issue was seen on AMD Ryzen 9 5900X Expected b Oct 8, 2014 · Kernel. The AOCL-SecureRNG library provides APIs to access the cryptographically secure random numbers generated by AMD’s hardware-based random number generator implementation. 8M subscribers in the Amd community. AMD Community Jul 31, 2023 · Torvalds acknowledged that rdrand can be slow, but compared to the stuttering users are seeing as a result of the fTPM, it would seem to be the better alternative. Unfortunately, unpatched Ryzen 3000 says "yes" to the CPUID 01H call, sets the carry bit indicating it has successfully created the most artisanal, organic high-quality random number possible and gives you a 0xFFFFFFFF for the "random" number, every single time. Aug 31, 2021 · Similar to the RDRAND situation a couple of years ago--which is an Intel-specific bit of archaic code few use anymore that did not function optimally in the AMD architecture--AMD instructions then Dec 13, 2024 · A test payload for Milan and Genoa CPUs that makes the RDRAND instruction return 4 can be downloaded here (applying it requires the user to be root from outside of a VM). Oct 30, 2019 · 2019年7月7日に発売されたAMDのZen 2アーキテクチャを採用した第3世代RyzenのRyzen 3000シリーズで命令系統に不具合があり、一部環境が動作しないと Oct 30, 2019 · AMD Zen also supports it. As for why it takes so many clock cycles, it's because its a very good True RNG compliant with NIST SP 800-90A, FIPS 140-2 and ANSI X9. CPUID can determine if the flag is set. Probably not segfault, I'm Cryptographic Co-Processor (CCP) 5. 1. May 8, 2019 · Michael Larabel of Phoronix comments that the RdRand bug is only found on older generations of AMD processors, "Excavator" and older; and does not affect the latest "Zen" processors. By avoiding RdRand usage on the system Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon, Zen4, RDNA3, EPYC, Threadripper, rumors, reviews, news and more. /r/AMD is community run and does not represent AMD in any capacity unless specified. org Bugzilla – Bug 85911 rdrand instruction fails after resume on AMD family 22 CPU Last modified: 2021-03-12 09:27:39 UTC About trusting CPUs: We know that we can't trust RdRand, because it's such an easy attack vector. Jul 30, 2020 · This probably doesn't help that much, but I can assure you that Vega 8 is supported under Ubuntu and causes no glitches to me whatsoever. The rougher experience on linux was with AMD APUs, which seems to have settled down, though I’m not sure if they’re fully resolved. If it is, bit 30 of the ECX register is set after calling CPUID standard function 01H. Download and run directly onto the system you want to update. Jul 30, 2019 · For Linux users and Destiny 2 fans alike, the launch of AMD's latest-gen Ryzen CPUs has been anything but smooth. What’s an RDRAND? printf("\nThe RDRAND instruction of this CPU appears to be working. This mostly affected kernel compiling but you never know how these bugs will manifest themselves. /RDRAND_Tester_Linux_x86_64 --之后的随机数完全相同 RDRAND Tester v20210328 x86_64 Compiled on Apr 16 2021 May 7, 2019 · This bug is about code that is, according to the AMD doco, using the instruction correctly; but that is, because the AMD processor has this possible state after a suspend+resume, getting all-ones as its random data, thereby causing ID collisions in a fairly wide range of possible things from freshly re-generated machine IDs to journal file The AOCL-SecureRNG library provides APIs to access the cryptographically secure random numbers generated by AMD’s hardware-based random number generator implementation. 0. 2 SSE4a SSSE3 XSAVE Mar 5, 2025 · Both Intel and AMD designed unique RISC-based microcode instruction sets, both of which are undocumented, but conceptually similar to other RISC instruction sets like ARM or RISC-V. Jun 4, 2024 · 1. RDRAND int get_rdrand16u( uint16_t *rng_val, unsigned int retry_count) Fetch a single 16-bit value by calling the RDRAND instruction Parameters: rng_val - Pointer to memory to store the value returned by RDRAND retry_count - Number of retry attempts Return type int: Success or failure status of function call int get_rdrand32u( Jan 16, 2020 · AMD cpu's from family 15h and 16h fail to produce random numbers using RDRAND after a suspend/resume. Linux didn't want to "trust" this hardware, for whatever reason. Der AMD Microcode-Bug in Ryzen 3000 CPUs hatte bereit kurz nach dem Release entsprechender Boards mit diesem Prozessor für Ärger gesorgt. AMD Hardware RNG Architecture The main components are • Noise Source The RNG uses 16 separate ring oscillators chains as the noise source. Funtoo Linux; FL-7724; amd microcode bug affecting AMD Ryzen 3000+ and RDRAND() May 8, 2019 · Michael Larabel of Phoronix comments that the RdRand bug is only found on older generations of AMD processors, "Excavator" and older; and does not affect the latest "Zen" processors. Originally, it was developed by Intel, however it has since been implemented on AMD CPU’s, which is of course where this bug lies. And also, frankly, I wouldn't trust HW RNGs for other reasons, including the existence of backdoors within them, so probably you should just disable the RDRAND support anyway. I guess there was that one time an AMD bug in the instruction returned all-zeros (or something similar). Excluding this one, I dont see any other issues affecting Linux daily usage. Unfortunately, unpatched Ryzen 3000 says "y Feb 23, 2016 · » AMD Ryzen 3000 CPU RDRAND bug workaround backport ISO; Pages: 1 #1 2019-07-09 01:28:09. 3ABB is available. Those values can still be returned by a properly working rdrand implementation in 2 in 2 May 7, 2019 · By avoiding RdRand usage on the system as part of generating a UUID, the reported systemd issue no longer happens. Microsoft patched the bug in older Zen CPUs. Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon… Oct 29, 2019 · The microcode bug in question is a faulty response to the RDRAND instruction. Apparently you don't like to hear anything bad about AMD, but even common frameworks such as Qt are applying workarounds as well. What might be causing an issue for you is a RDRAND() Bug in your CPU (which is prominent in the 3000 cpu series), which always returns 0xFFFFFF or similar. [Test Case] * Boot with fixed systemd on an AMD Ryzen 3000 series system. 01H:ECX. 存在 bug 的代码会对 RDRAND 指令做出错误的响应，而这个 bug 之所以非常严重，则需要从 RDRAND 说起。 事实上，从英特尔的 Broadwell 以及 AMD Zen 架构开始，现代 x86_64 CPU 必须内置高质量的板载随机数生成器（RNG），负责利用热“噪声”快速向具有内核 RDRAND int get_rdrand16u( uint16_t *rng_val, unsigned int retry_count) Fetch a single 16-bit value by calling the RDRAND instruction Parameters: rng_val - Pointer to memory to store the value returned by RDRAND retry_count - Number of retry attempts Return type int: Success or failure status of function call int get_rdrand32u( View all badges. 70 April 2018 AMD Secure Random Number Generator Library AMD Secure RNG Library 7 Figure 1. Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon… printf("\nThe RDRAND instruction of this CPU appears to be working. Apart from the fa Apr 14, 2024 · The RDRAND instruction of this CPU appears to be working. I disable all of this stuff anyways, but they are on by default. Oct 29, 2019 · Obvious RDRAND bug impacts. Jan 11, 2021 · systemd version the issue has been seen with 247. 目前，AMD和Intel的工程师都提交了新的补丁，不再采用上面的方法来处理问题，而相关补丁也已合并到了Linux 6. The numbers generated should be different and random. 5-arch1-1 CPU architecture issue was seen on AMD Ryzen Ryzen USB disconnect is rare and tied to way too many factors. These high quality random numbers are robust and are designed to suit cryptographic applications. It is meant of fast source of “good enough entropy” for short lived secrets. Also, at least Intel provides TSX for the few customers which use it, unlike AMD. \n" "The numbers generated should be different and random. Bug in RDRAND bringt Ärger. Another bug affects VFIO, there is a patch available that provides some kind of workaround. RDRAND was fixed in-firmware a million years ago. It also is likely NOT to be a CPU bug. 所用到的随机数生成器由芯片上的熵池初始化。RDRAND指令在Ivy Bridge架构处理器上可用[a]，该指令也是X86-64和IA-32指令集的一部分。AMD在2015年6月添加了对RdRand指令的支持。 Nov 13, 2020 · Finally, about the RDRAND bug, AMD released updates for their motherboard BIOSes and for the CPU microcodes, so that's solved. That bug report cites RdRand failing after resume on AMD CPUs. When the RDRAND bug in Ryzen 3000 first surfaced back in June, Linux users widely reported that their entire Ryzen 3000-powered systems wouldn't boot. If the numbers generated appears to be similar, the RDRAND instruction is broken. Apart from the fa Feb 14, 2021 · AMD says the fix has been released ages ago, but it has to be implemented by the vendor via a bios upgrade, and I'm wondering if such an update is coming for this motherboard? Tags (4) Tags: 如何看待传闻amd rdna3芯片存在硬件设计bug？ [图片] [图片] 汇总以上来自社交账号的爆料，RDNA3 A0步进芯片可能存在两个问题： 着色器预取单元无法正常工作。 Jun 11, 2022 · 而这个线程也在调用malloc申请内存，走到了LowFragHeap里面，正在执行一条rdrand指令。 让exe继续执行，然后断下来看栈，发现这个线程一直卡在rdrand上并未返回。 搜了一下，AMD Ryzen 3000系列出过rdrand返回的随机数不随机的bug。 看来还有卡死的bug。 Feb 21, 2019 · RDSEED,RDRAND是两个汇编指令，通过硅片上的热噪声来生成随机数。 从Intel Broadwell架构的 CPU 和AMD Zen架构的 CPU开始支持此指令. 13 after dodgy Microsoft code change; AMD sharpens silicon swords to take on chip and AI rivals "AMD has made available a mitigation for this issue which requires updating microcode on all impacted platforms to help prevent an attacker from loading malicious microcode," the chip designer explained. June 2015 [15 October 2015]. AMD Ryzen 3000 CPU RDRAND RDRAND is kinda-sorta like /dev/urandom, while RDSEED is /dev/random with stronger entropy guarantees. Aug 2, 2023 · Torvalds 在邮件列表中评论 fTPM 为“crud”，并推荐最好的方法就是，完全禁用 fTPM。他还敦促其他 Linux 开发人员使用 CPU RDRAND 指令来执行相同的任务，不会导致出现和 fTPM 相同的问题。 AMD 公司发布的 Ryzen 3000 处理器中，存在一项与随机数生成器相关的严重微代码 bug。 也正是因为这个早已曝光数月却没有得到有效解决的“错误”，本篇文章的主人公 Jim Salter 度过了一个非常糟糕的周末。 Oct 28, 2019 · CPU Information - By Mounir IDRASSI (mounir_at_idrix. 在amd和intel的cpu上，cpuid指令都可以檢測中央處理器（cpu）是否支持rdrand 指令。 如果支持，調用cpuid的標準函數01h之後，ecx寄存器的第30位會被設置成1 [10] 。 50 votes, 24 comments. Also referenced is this Linux kernel bug report that is still open after five years. AMD: 278. 0内核中，以后就不会有意外情况发生了。 原文作者： 快科技 /宪瑞 作品来源： 嵌入式微处理器 原文链接：一个操作系统bug竟然坑了AMD近20年… In general Linux works just fine. The good news for OpenSSL users is that this hardware bug in AMD APUs is actually been known and documented in RedHat bug #85911 since 2014. 1 SSE4. AMD has issued a fix but it's not in every motherboards available BIOS just yet. 1404 fixes the AMD RDRAND bug (where the random number generator just does not work). 82 - you can probably see why it's so weird for Bungie to be using it in a game, it's like using a As far as I understand, the RDRAND bug that requires the 1003ABB BIOS affects only the new Zen 2 Ryzen 3xxx chips. Apart from the fa Jul 31, 2023 · If you don't trust the CPU rdrand implementation (and that has had bugs too - see clear_rdrand_cpuid_bit() and x86_init_rdrand()), why would you trust the fTPM version that has caused even *more* problems? So I don't see any downside to just saying "that fTPM thing is not working". Mar 10, 2020 · What is more disturbing is that the root RDRAND issue is/was a long-standing issue from many CPU generations ago: 1150286 – rdrand instruction fails after resume on AMD CPU. Oct 29, 2019 · I am a developer and I am on a lot of forums besides this one. applies to part. /test-rdrand RDRAND() = 0x47c993c0 RDRAND() = 0xec7c697d (more seemingly random numbers) RDRAND() = 0xba858101 I tried it with the latest microcode dd 2024-07-10, but that didn't make a difference. [10] AMD processors are checked for the feature using the same test. Timeline. Don't trust it. The RNG is designed to be compliant with the NIST SP 800-90 documents and uses constructs defined in those documents. " @biffzinker I don't think it was the RDRAND bug, since there were still reports on Zen 2. As far as I can tell, AMD did so only by direct email response; there's no press release about it—and the company's response made it sound like everything would be fixed in a week or two. Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon… Oct 29, 2019 · I am a developer and I am on a lot of forums besides this one. 6M subscribers in the Amd community. drebdkv hozio efjv vbed hwpfm gzoaparsl vtktr vttba htovf ulslc xpyk zdazsn cib gbmq mxsy