From: Borislav Petkov <bp@alien8.de>
To: Arvind Sankar <nivedita@alum.mit.edu>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86/cmdline: Disable instrumentation of cmdline unconditionally
Date: Thu, 17 Sep 2020 11:40:55 +0200 [thread overview]
Message-ID: <20200917094055.GF31960@zn.tnic> (raw)
In-Reply-To: <20200906154637.1618112-1-nivedita@alum.mit.edu>
On Sun, Sep 06, 2020 at 11:46:37AM -0400, Arvind Sankar wrote:
> On 32-bit, cmdline_find_option_bool() is used before paging is enabled,
> from check_loader_disabled_bsp() in the early microcode loader.
> Instrumentation options that insert accesses to global data will likely
> crash or corrupt memory at this point.
What is the use case here, can you trigger an actual crash?
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2020-09-17 9:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-06 15:46 Arvind Sankar
2020-09-17 9:40 ` Borislav Petkov [this message]
2020-09-17 16:05 ` Arvind Sankar
2020-09-17 17:28 ` Borislav Petkov
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