linux-kernel - [PATCH v2 2/2] x86: Make source of unrecognised MSR writes unambiguous

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Message-ID: <6f6fbd0ee6c99bc5e47910db700a6642159db01b.1598011595.git.chris@chrisdown.name>
Date:   Fri, 21 Aug 2020 13:10:35 +0100
From:   Chris Down <chris@...isdown.name>
To:     linux-kernel@...r.kernel.org
Cc:     Borislav Petkov <bp@...e.de>, Jakub Kicinski <kuba@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, kernel-team@...com,
        sean.j.christopherson@...el.com, tony.luck@...el.com,
        torvalds@...ux-foundation.org, x86@...nel.org
Subject: [PATCH v2 2/2] x86: Make source of unrecognised MSR writes
 unambiguous

In many cases the comm enough isn't enough to distinguish the offender,
since for interpreted languages it's likely just going to be "python3"
or whatever. Add the pid to make it unambiguous.

Signed-off-by: Chris Down <chris@...isdown.name>
Cc: Borislav Petkov <bp@...e.de>
Cc: Jakub Kicinski <kuba@...nel.org>
---
 arch/x86/kernel/msr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index eaf375245549..812e64ef5ff5 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -102,8 +102,9 @@ static int filter_write(u32 reg)
 	if (reg == MSR_IA32_ENERGY_PERF_BIAS)
 		return 0;
 
-	pr_err("Write to unrecognized MSR 0x%x by %s\n"
-	       "Please report to x86@...nel.org\n", reg, current->comm);
+	pr_err("Write to unrecognized MSR 0x%x by %s (pid: %d)\n"
+	       "Please report to x86@...nel.org\n",
+	       reg, current->comm, current->pid);
 
 	return 0;
 }
-- 
2.28.0