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authorThomas Gleixner <tglx@linutronix.de>2017-12-20 18:51:31 +0100
committerIngo Molnar <mingo@kernel.org>2017-12-22 20:13:05 +0100
commit92a0f81d89571e3e8759366e050ee05cc545ef99 (patch)
treee91c882e3a4ee2ab80673473389067adf9dd7807 /arch/x86/mm/kasan_init_64.c
parented1bbc40a0d10e0c5c74fe7bdc6298295cf40255 (diff)
downloadlinux-92a0f81d89571e3e8759366e050ee05cc545ef99.tar.bz2
x86/cpu_entry_area: Move it out of the fixmap
Put the cpu_entry_area into a separate P4D entry. The fixmap gets too big and 0-day already hit a case where the fixmap PTEs were cleared by cleanup_highmap(). Aside of that the fixmap API is a pain as it's all backwards. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm/kasan_init_64.c')
-rw-r--r--arch/x86/mm/kasan_init_64.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 9ec70d780f1f..47388f0c0e59 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -15,6 +15,7 @@
#include <asm/tlbflush.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
+#include <asm/cpu_entry_area.h>
extern struct range pfn_mapped[E820_MAX_ENTRIES];
@@ -322,31 +323,33 @@ void __init kasan_init(void)
map_range(&pfn_mapped[i]);
}
- kasan_populate_zero_shadow(
- kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
- kasan_mem_to_shadow((void *)__START_KERNEL_map));
-
- kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),
- (unsigned long)kasan_mem_to_shadow(_end),
- early_pfn_to_nid(__pa(_stext)));
-
- shadow_cpu_entry_begin = (void *)__fix_to_virt(FIX_CPU_ENTRY_AREA_BOTTOM);
+ shadow_cpu_entry_begin = (void *)CPU_ENTRY_AREA_BASE;
shadow_cpu_entry_begin = kasan_mem_to_shadow(shadow_cpu_entry_begin);
shadow_cpu_entry_begin = (void *)round_down((unsigned long)shadow_cpu_entry_begin,
PAGE_SIZE);
- shadow_cpu_entry_end = (void *)(__fix_to_virt(FIX_CPU_ENTRY_AREA_TOP) + PAGE_SIZE);
+ shadow_cpu_entry_end = (void *)(CPU_ENTRY_AREA_BASE +
+ CPU_ENTRY_AREA_MAP_SIZE);
shadow_cpu_entry_end = kasan_mem_to_shadow(shadow_cpu_entry_end);
shadow_cpu_entry_end = (void *)round_up((unsigned long)shadow_cpu_entry_end,
PAGE_SIZE);
- kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
- shadow_cpu_entry_begin);
+ kasan_populate_zero_shadow(
+ kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM),
+ shadow_cpu_entry_begin);
kasan_populate_shadow((unsigned long)shadow_cpu_entry_begin,
(unsigned long)shadow_cpu_entry_end, 0);
- kasan_populate_zero_shadow(shadow_cpu_entry_end, (void *)KASAN_SHADOW_END);
+ kasan_populate_zero_shadow(shadow_cpu_entry_end,
+ kasan_mem_to_shadow((void *)__START_KERNEL_map));
+
+ kasan_populate_shadow((unsigned long)kasan_mem_to_shadow(_stext),
+ (unsigned long)kasan_mem_to_shadow(_end),
+ early_pfn_to_nid(__pa(_stext)));
+
+ kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
+ (void *)KASAN_SHADOW_END);
load_cr3(init_top_pgt);
__flush_tlb_all();