From: Mikhail Paulyshka <me@mixaill.net>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Mario Limonciello <mario.limonciello@amd.com>
Subject: Re: [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED
Date: Wed, 12 Mar 2025 16:17:52 +0300 [thread overview]
Message-ID: <10f010ca-b79f-4886-ba18-3013560905b2@mixaill.net> (raw)
In-Reply-To: <20250312124006.GCZ9GApgQQ49dO_BMW@fat_crate.local>
On 3/12/25 3:40 PM, Borislav Petkov wrote:
> On Wed, Mar 12, 2025 at 03:31:28PM +0300, Mikhail Paulyshka wrote:
>> On the AMD Cyan Skillfish (Family 0x17 Model 0x47 Stepping 0x0), which
>> is a Zen2-based APU found on the AMD BC-250 board, there is a situation
>> where RDRAND works fine, but RDSEED generates FF. This leads to some
>> applications that use RDSEED to generate random numbers (such as
>> Qt and KDE) into a nearly unusable state.
>>
>> Although AMD has fixed the Zen2 RDRAND issues in 2019 with a microcode update,
>> no such update has been released for the Family 0x17 Model 0x47 core.
> What's the microcode level on that machine?
> dmesg | grep -i microcode [ 0.059689] [ T0] Zenbleed: please update your microcode for the most
optimal fix [ 0.663746] [ T1] microcode: Current revision: 0x08407007
> Also, send
>
> cpuid -r
https://paste.debian.net/1362645
next prev parent reply other threads:[~2025-03-12 13:17 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-12 12:31 Mikhail Paulyshka
2025-03-12 12:31 ` [PATCH 1/2] " Mikhail Paulyshka
2025-03-12 16:32 ` Borislav Petkov
2025-03-21 6:51 ` kernel test robot
2025-03-12 12:31 ` [PATCH 2/2] x86/rdrand: hide RDRAND and RDSEED from CPUID in case of a malfunction Mikhail Paulyshka
2025-03-12 12:45 ` Borislav Petkov
2025-03-12 13:36 ` Mikhail Paulyshka
2025-03-12 12:40 ` [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED Borislav Petkov
2025-03-12 13:17 ` Mikhail Paulyshka [this message]
2025-03-14 8:40 ` Mikhail Paulyshka
2025-03-13 17:32 ` Borislav Petkov
2025-03-14 8:16 ` Mikhail Paulyshka
2025-03-18 20:50 ` Mario Limonciello
2025-03-18 21:40 ` Mikhail Paulyshka
2025-04-14 11:52 ` Borislav Petkov
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