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Message-ID: <158344925342.28353.8367194721815610047.tip-bot2@tip-bot2>
Date: Thu, 05 Mar 2020 23:00:53 -0000
From: "tip-bot2 for Arvind Sankar" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Arvind Sankar <nivedita@...m.mit.edu>,
Thomas Gleixner <tglx@...utronix.de>,
Tycho Andersen <tycho@...ho.ws>,
Kees Cook <keescook@...omium.org>, x86 <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/mm] x86/mm/init/32: Stop printing the virtual memory layout
The following commit has been merged into the x86/mm branch of tip:
Commit-ID: 681ff0181bbfb183e32bc6beb6ec076304470479
Gitweb: https://git.kernel.org/tip/681ff0181bbfb183e32bc6beb6ec076304470479
Author: Arvind Sankar <nivedita@...m.mit.edu>
AuthorDate: Thu, 05 Mar 2020 10:01:52 -05:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 05 Mar 2020 23:53:55 +01:00
x86/mm/init/32: Stop printing the virtual memory layout
For security reasons, 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>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Tycho Andersen <tycho@...ho.ws>
Acked-by: Kees Cook <keescook@...omium.org>
Link: https://lkml.kernel.org/r/20200305150152.831697-1-nivedita@alum.mit.edu
---
arch/x86/mm/init_32.c | 38 --------------------------------------
1 file changed, 38 deletions(-)
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 23df488..8ae0272 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -788,44 +788,6 @@ void __init mem_init(void)
x86_init.hyper.init_after_bootmem();
mem_init_print_info(NULL);
- printk(KERN_INFO "virtual kernel memory layout:\n"
- " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
- " cpu_entry : 0x%08lx - 0x%08lx (%4ld kB)\n"
-#ifdef CONFIG_HIGHMEM
- " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
-#endif
- " 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,
-
- CPU_ENTRY_AREA_BASE,
- CPU_ENTRY_AREA_BASE + CPU_ENTRY_AREA_MAP_SIZE,
- CPU_ENTRY_AREA_MAP_SIZE >> 10,
-
-#ifdef CONFIG_HIGHMEM
- PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
- (LAST_PKMAP*PAGE_SIZE) >> 10,
-#endif
-
- VMALLOC_START, VMALLOC_END,
- (VMALLOC_END - VMALLOC_START) >> 20,
-
- (unsigned long)__va(0), (unsigned long)high_memory,
- ((unsigned long)high_memory - (unsigned long)__va(0)) >> 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
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