lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-Id: <1514252671-27720-1-git-send-email-qianyue.zj@alibaba-inc.com> Date: Tue, 26 Dec 2017 09:44:31 +0800 From: "Jia Zhang" <qianyue.zj@...baba-inc.com> To: bp@...en8.de Cc: <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>, <x86@...nel.org>, <linux-kernel@...r.kernel.org>, <tony.luck@...el.com>, "Jia Zhang" <qianyue.zj@...baba-inc.com> Subject: [PATCH v3] x86/microcode/intel: Blacklist the specific BDW-EP for late loading Instead of blacklisting all Broadwell processorsi for running a late loading, only BDW-EP (signature 406f1) with the microcode version less than 0x0b000021 needs to be blacklisted. This is documented in the the public documentation #334165 (See the item BDF90 for details). Signed-off-by: Jia Zhang <qianyue.zj@...baba-inc.com> --- arch/x86/kernel/cpu/microcode/intel.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index 8ccdca6..d2c1638 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -910,8 +910,15 @@ static bool is_blacklisted(unsigned int cpu) { struct cpuinfo_x86 *c = &cpu_data(cpu); - if (c->x86 == 6 && c->x86_model == INTEL_FAM6_BROADWELL_X) { - pr_err_once("late loading on model 79 is disabled.\n"); + /* + * The Broadwell-EP processor with the microcode version less + * then 0x0b000021 may reault in system hang when running a late + * loading. This behavior is documented in item BDF90, #334165 + * (Intel Xeon Processor E7-8800/4800 v4 Product Family). + */ + if (c->x86 == 6 && c->x86_model == INTEL_FAM6_BROADWELL_X && + c->x86_mask == 0x01 && c->microcode < 0x0b000021U) { + pr_err_once("late loading on model 79 (sig 64f1) is disabled.\n"); return true; } -- 1.8.3.1
Powered by blists - more mailing lists