linux-kernel - [PATCH] microblaze: Stop printing the virtual memory layout

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Date:   Thu,  5 Mar 2020 10:05:03 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Tobin C . Harding" <me@...in.cc>, Tycho Andersen <tycho@...ho.ws>,
        kernel-hardening@...ts.openwall.com,
        Michal Simek <monstr@...str.eu>, linux-kernel@...r.kernel.org
Subject: [PATCH] microblaze: Stop printing the virtual memory layout

For security, don't display the kernel's virtual memory layout.

Kees Cook points out:
"These have been entirely removed on other architectures, so let's
just do the same for ia32 and remove it unconditionally."

071929dbdd86 ("arm64: Stop printing the virtual memory layout")
1c31d4e96b8c ("ARM: 8820/1: mm: Stop printing the virtual memory layout")
31833332f798 ("m68k/mm: Stop printing the virtual memory layout")
fd8d0ca25631 ("parisc: Hide virtual kernel memory layout")
adb1fe9ae2ee ("mm/page_alloc: Remove kernel address exposure in free_reserved_area()")

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
---
 arch/microblaze/mm/init.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index 1056f1674065..8323651bf7ec 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -201,18 +201,6 @@ void __init mem_init(void)
 #endif
 
 	mem_init_print_info(NULL);
-#ifdef CONFIG_MMU
-	pr_info("Kernel virtual memory layout:\n");
-	pr_info("  * 0x%08lx..0x%08lx  : fixmap\n", FIXADDR_START, FIXADDR_TOP);
-#ifdef CONFIG_HIGHMEM
-	pr_info("  * 0x%08lx..0x%08lx  : highmem PTEs\n",
-		PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
-#endif /* CONFIG_HIGHMEM */
-	pr_info("  * 0x%08lx..0x%08lx  : early ioremap\n",
-		ioremap_bot, ioremap_base);
-	pr_info("  * 0x%08lx..0x%08lx  : vmalloc & ioremap\n",
-		(unsigned long)VMALLOC_START, VMALLOC_END);
-#endif
 	mem_init_done = 1;
 }
 
-- 
2.24.1