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

Arvind Sankar
2020-03-05T15:06:43Z

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@alum.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