From: Nick Desaulniers <ndesaulniers@google.com>
Date: Wed, 10 Feb 2021 08:28:05 +0000 (+0530)
Subject: tracing: do not leak kernel addresses
X-Git-Tag: MMI-QSBS30.62-29-11-5^0
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c9ce8e936bf812d91c3e29352ec963fc0f74a2ba;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

tracing: do not leak kernel addresses

This likely breaks tracing tools like trace-cmd.  It logs in the same
format but now addresses are all 0x0.

Mot-CRs-fixed:(CR)
CVE-Fixed:CVE-2017-0630
Bug: 34277115

Change-Id: Ie837ab27d8f4cc164828ad70a916f3de688056cf
Reviewed-on: https://gerrit.mot.com/1875873
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Reviewed-by: Srikanth A R <arsrikan@motorola.com>
Reviewed-by: Ravikumar Vembu <Raviv@motorola.com>
Reviewed-by: Yinjun Chen <a7301c@motorola.com>
Tested-by: Yinjun Chen <a7301c@motorola.com>
Submit-Approved: Yinjun Chen <a7301c@motorola.com>
---

diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index ad1d6164e946..e82cff5c842c 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -304,7 +304,7 @@ static int t_show(struct seq_file *m, void *v)
 	if (!*fmt)
 		return 0;
 
-	seq_printf(m, "0x%lx : \"", *(unsigned long *)fmt);
+	seq_printf(m, "0x%lx : \"", 0L);
 
 	/*
 	 * Tabs and new lines need to be converted.