Re: [PATCH] powerpc/32: Stop printing the virtual memory layout
From: Christophe Leroy <hidden>
Date: 2022-03-09 19:35:41
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lkml
Le 05/03/2020 à 16:08, Arvind Sankar a écrit :
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 <redacted>This patch doesn't apply anymore. This patch is referenced in https://github.com/linuxppc/issues/issues/390
quoted hunk ↗ jump to hunk
--- arch/powerpc/mm/mem.c | 17 ----------------- 1 file changed, 17 deletions(-)diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index ef7b1119b2e2..df2c143b6bf7 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c@@ -331,23 +331,6 @@ void __init mem_init(void) #endif mem_init_print_info(NULL); -#ifdef CONFIG_PPC32 - pr_info("Kernel virtual memory layout:\n"); -#ifdef CONFIG_KASAN - pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n", - KASAN_SHADOW_START, KASAN_SHADOW_END); -#endif - 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 */ - if (ioremap_bot != IOREMAP_TOP) - pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", - ioremap_bot, IOREMAP_TOP); - pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", - VMALLOC_START, VMALLOC_END); -#endif /* CONFIG_PPC32 */ } void free_initmem(void)