linux-kernel - [PATCH AUTOSEL 4.14 18/37] x86/mm: Don't leak kernel addresses

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Message-Id: <20190330005441.27540-18-sashal@kernel.org>
Date:   Fri, 29 Mar 2019 20:54:19 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Matteo Croce <mcroce@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.14 18/37] x86/mm: Don't leak kernel addresses

From: Matteo Croce <mcroce@...hat.com>

[ Upstream commit a3151724437f54076cc10bc02b1c4f0003ae36cd ]

Since commit:

  ad67b74d2469d9b8 ("printk: hash addresses printed with %p")

at boot "____ptrval____" is printed instead of actual addresses:

    found SMP MP-table at [mem 0x000f5cc0-0x000f5ccf] mapped at [(____ptrval____)]

Instead of changing the print to "%px", and leaking a kernel addresses,
just remove the print completely, like in:

  071929dbdd865f77 ("arm64: Stop printing the virtual memory layout").

Signed-off-by: Matteo Croce <mcroce@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kernel/mpparse.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index bc6bc6689e68..1c52acaa5bec 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -596,8 +596,8 @@ static int __init smp_scan_config(unsigned long base, unsigned long length)
 			mpf_base = base;
 			mpf_found = true;
 
-			pr_info("found SMP MP-table at [mem %#010lx-%#010lx] mapped at [%p]\n",
-				base, base + sizeof(*mpf) - 1, mpf);
+			pr_info("found SMP MP-table at [mem %#010lx-%#010lx]\n",
+				base, base + sizeof(*mpf) - 1);
 
 			memblock_reserve(base, sizeof(*mpf));
 			if (mpf->physptr)
-- 
2.19.1