linux-kernel - [PATCH] nds32/mm: Stop printing the virtual memory layout

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Message-Id: <20200305150639.834129-1-nivedita@alum.mit.edu>
Date:   Thu,  5 Mar 2020 10:06:39 -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,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] nds32/mm: 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/nds32/mm/init.c | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/arch/nds32/mm/init.c b/arch/nds32/mm/init.c
index 0be3833f6814..1c1e79b4407c 100644
--- a/arch/nds32/mm/init.c
+++ b/arch/nds32/mm/init.c
@@ -205,36 +205,6 @@ void __init mem_init(void)
 	memblock_free_all();
 	mem_init_print_info(NULL);
 
-	pr_info("virtual kernel memory layout:\n"
-		"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
-#ifdef CONFIG_HIGHMEM
-		"    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
-#endif
-		"    consist : 0x%08lx - 0x%08lx   (%4ld MB)\n"
-		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
-		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
-		"      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
-		"      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
-		"      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
-		FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10,
-#ifdef CONFIG_HIGHMEM
-		PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
-		(LAST_PKMAP * PAGE_SIZE) >> 10,
-#endif
-		CONSISTENT_BASE, CONSISTENT_END,
-		((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START,
-		(unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20,
-		(unsigned long)__va(memory_start), (unsigned long)high_memory,
-		((unsigned long)high_memory -
-		 (unsigned long)__va(memory_start)) >> 20,
-		(unsigned long)&__init_begin, (unsigned long)&__init_end,
-		((unsigned long)&__init_end -
-		 (unsigned long)&__init_begin) >> 10, (unsigned long)&_etext,
-		(unsigned long)&_edata,
-		((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
-		(unsigned long)&_text, (unsigned long)&_etext,
-		((unsigned long)&_etext - (unsigned long)&_text) >> 10);
-
 	/*
 	 * Check boundaries twice: Some fundamental inconsistencies can
 	 * be detected at build time already.
-- 
2.24.1