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Date: Thu, 5 Mar 2020 10:10:10 -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,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>,
linux-sh@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] sh: 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/sh/mm/init.c | 41 -----------------------------------------
1 file changed, 41 deletions(-)
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index d1b1ff2be17a..e68a1106e99b 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -360,47 +360,6 @@ void __init mem_init(void)
vsyscall_init();
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
- " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
- " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
-#ifdef CONFIG_UNCACHED_MAPPING
- " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
-#endif
- " .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
-
- (unsigned long)VMALLOC_START, VMALLOC_END,
- (VMALLOC_END - VMALLOC_START) >> 20,
-
- (unsigned long)memory_start, (unsigned long)high_memory,
- ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
-
-#ifdef CONFIG_UNCACHED_MAPPING
- uncached_start, uncached_end, uncached_size >> 20,
-#endif
-
- (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);
-
mem_init_done = 1;
}
--
2.24.1
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