[PATCH AUTOSEL 5.0 29/67] x86/mm: Don't leak kernel addresses

From: Sasha Levin
Date: Fri Mar 29 2019 - 21:10:23 EST


From: Matteo Croce <mcroce@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 3482460d984d..1bfe5c6e6cfe 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -598,8 +598,8 @@ 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