x86/mm/kasan: Don't use vmemmap_populate() to initialize shadow

[ Note, this is a Git cherry-pick of the following commit:

    d17a1d97dc20: ("x86/mm/kasan: don't use vmemmap_populate() to initialize shadow")

  ... for easier x86 PTI code testing and back-porting. ]

The KASAN shadow is currently mapped using vmemmap_populate() since that
provides a semi-convenient way to map pages into init_top_pgt.  However,
since that no longer zeroes the mapped pages, it is not suitable for
KASAN, which requires zeroed shadow memory.

Add kasan_populate_shadow() interface and use it instead of
vmemmap_populate().  Besides, this allows us to take advantage of
gigantic pages and use them to populate the shadow, which should save us
some memory wasted on page tables and reduce TLB pressure.

Link: http://lkml.kernel.org/r/20171103185147.2688-2-pasha.tatashin@oracle.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Steven Sistare <steven.sistare@oracle.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Bob Picco <bob.picco@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4ae940a0ed3bc683202ada0c3c376117ef00dcbf..665eba1b610393f122d1ddca1ad950d40a5be7cf 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -108,7 +108,7 @@ config X86
        select HAVE_ARCH_AUDITSYSCALL
        select HAVE_ARCH_HUGE_VMAP              if X86_64 || X86_PAE
        select HAVE_ARCH_JUMP_LABEL
-       select HAVE_ARCH_KASAN                  if X86_64 && SPARSEMEM_VMEMMAP
+       select HAVE_ARCH_KASAN                  if X86_64
        select HAVE_ARCH_KGDB
        select HAVE_ARCH_KMEMCHECK
        select HAVE_ARCH_MMAP_RND_BITS          if MMU

diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 2b60dc6e64b1daa857ee68d75683b1b2850899d5..99dfed6dfef8b2f9028f82b89ab8dc2bde8173c4 100644 (file)
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -4,12 +4,14 @@
 #include <linux/bootmem.h>
 #include <linux/kasan.h>
 #include <linux/kdebug.h>
+#include <linux/memblock.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/sched/task.h>
 #include <linux/vmalloc.h>
 
 #include <asm/e820/types.h>
+#include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
 #include <asm/sections.h>
 #include <asm/pgtable.h>
@@ -18,7 +20,134 @@ extern struct range pfn_mapped[E820_MAX_ENTRIES];
 
 static p4d_t tmp_p4d_table[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
 
-static int __init map_range(struct range *range)
+static __init void *early_alloc(size_t size, int nid)
+{
+       return memblock_virt_alloc_try_nid_nopanic(size, size,
+               __pa(MAX_DMA_ADDRESS), BOOTMEM_ALLOC_ACCESSIBLE, nid);
+}
+
+static void __init kasan_populate_pmd(pmd_t *pmd, unsigned long addr,
+                                     unsigned long end, int nid)
+{
+       pte_t *pte;
+
+       if (pmd_none(*pmd)) {
+               void *p;
+
+               if (boot_cpu_has(X86_FEATURE_PSE) &&
+                   ((end - addr) == PMD_SIZE) &&
+                   IS_ALIGNED(addr, PMD_SIZE)) {
+                       p = early_alloc(PMD_SIZE, nid);
+                       if (p && pmd_set_huge(pmd, __pa(p), PAGE_KERNEL))
+                               return;
+                       else if (p)
+                               memblock_free(__pa(p), PMD_SIZE);
+               }
+
+               p = early_alloc(PAGE_SIZE, nid);
+               pmd_populate_kernel(&init_mm, pmd, p);
+       }
+
+       pte = pte_offset_kernel(pmd, addr);
+       do {
+               pte_t entry;
+               void *p;
+
+               if (!pte_none(*pte))
+                       continue;
+
+               p = early_alloc(PAGE_SIZE, nid);
+               entry = pfn_pte(PFN_DOWN(__pa(p)), PAGE_KERNEL);
+               set_pte_at(&init_mm, addr, pte, entry);
+       } while (pte++, addr += PAGE_SIZE, addr != end);
+}
+
+static void __init kasan_populate_pud(pud_t *pud, unsigned long addr,
+                                     unsigned long end, int nid)
+{
+       pmd_t *pmd;
+       unsigned long next;
+
+       if (pud_none(*pud)) {
+               void *p;
+
+               if (boot_cpu_has(X86_FEATURE_GBPAGES) &&
+                   ((end - addr) == PUD_SIZE) &&
+                   IS_ALIGNED(addr, PUD_SIZE)) {
+                       p = early_alloc(PUD_SIZE, nid);
+                       if (p && pud_set_huge(pud, __pa(p), PAGE_KERNEL))
+                               return;
+                       else if (p)
+                               memblock_free(__pa(p), PUD_SIZE);
+               }
+
+               p = early_alloc(PAGE_SIZE, nid);
+               pud_populate(&init_mm, pud, p);
+       }
+
+       pmd = pmd_offset(pud, addr);
+       do {
+               next = pmd_addr_end(addr, end);
+               if (!pmd_large(*pmd))
+                       kasan_populate_pmd(pmd, addr, next, nid);
+       } while (pmd++, addr = next, addr != end);
+}
+
+static void __init kasan_populate_p4d(p4d_t *p4d, unsigned long addr,
+                                     unsigned long end, int nid)
+{
+       pud_t *pud;
+       unsigned long next;
+
+       if (p4d_none(*p4d)) {
+               void *p = early_alloc(PAGE_SIZE, nid);
+
+               p4d_populate(&init_mm, p4d, p);
+       }
+
+       pud = pud_offset(p4d, addr);
+       do {
+               next = pud_addr_end(addr, end);
+               if (!pud_large(*pud))
+                       kasan_populate_pud(pud, addr, next, nid);
+       } while (pud++, addr = next, addr != end);
+}
+
+static void __init kasan_populate_pgd(pgd_t *pgd, unsigned long addr,
+                                     unsigned long end, int nid)
+{
+       void *p;
+       p4d_t *p4d;
+       unsigned long next;
+
+       if (pgd_none(*pgd)) {
+               p = early_alloc(PAGE_SIZE, nid);
+               pgd_populate(&init_mm, pgd, p);
+       }
+
+       p4d = p4d_offset(pgd, addr);
+       do {
+               next = p4d_addr_end(addr, end);
+               kasan_populate_p4d(p4d, addr, next, nid);
+       } while (p4d++, addr = next, addr != end);
+}
+
+static void __init kasan_populate_shadow(unsigned long addr, unsigned long end,
+                                        int nid)
+{
+       pgd_t *pgd;
+       unsigned long next;
+
+       addr = addr & PAGE_MASK;
+       end = round_up(end, PAGE_SIZE);
+       pgd = pgd_offset_k(addr);
+       do {
+               next = pgd_addr_end(addr, end);
+               kasan_populate_pgd(pgd, addr, next, nid);
+       } while (pgd++, addr = next, addr != end);
+}
+
+static void __init map_range(struct range *range)
 {
        unsigned long start;
        unsigned long end;
@@ -26,7 +155,7 @@ static int __init map_range(struct range *range)
        start = (unsigned long)kasan_mem_to_shadow(pfn_to_kaddr(range->start));
        end = (unsigned long)kasan_mem_to_shadow(pfn_to_kaddr(range->end));
 
-       return vmemmap_populate(start, end, NUMA_NO_NODE);
+       kasan_populate_shadow(start, end, early_pfn_to_nid(range->start));
 }
 
 static void __init clear_pgds(unsigned long start,
@@ -189,16 +318,16 @@ void __init kasan_init(void)
                if (pfn_mapped[i].end == 0)
                        break;
 
-               if (map_range(&pfn_mapped[i]))
-                       panic("kasan: unable to allocate shadow!");
+               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));
 
-       vmemmap_populate((unsigned long)kasan_mem_to_shadow(_stext),
-                       (unsigned long)kasan_mem_to_shadow(_end),
-                       NUMA_NO_NODE);
+       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);