Commit 3010f876 authored by Pavel Tatashin's avatar Pavel Tatashin Committed by Linus Torvalds

mm: discard memblock data later

There is existing use after free bug when deferred struct pages are
enabled:

The memblock_add() allocates memory for the memory array if more than
128 entries are needed.  See comment in e820__memblock_setup():

  * The bootstrap memblock region count maximum is 128 entries
  * (INIT_MEMBLOCK_REGIONS), but EFI might pass us more E820 entries
  * than that - so allow memblock resizing.

This memblock memory is freed here:
        free_low_memory_core_early()

We access the freed memblock.memory later in boot when deferred pages
are initialized in this path:

        deferred_init_memmap()
                for_each_mem_pfn_range()
                  __next_mem_pfn_range()
                    type = &memblock.memory;

One possible explanation for why this use-after-free hasn't been hit
before is that the limit of INIT_MEMBLOCK_REGIONS has never been
exceeded at least on systems where deferred struct pages were enabled.

Tested by reducing INIT_MEMBLOCK_REGIONS down to 4 from the current 128,
and verifying in qemu that this code is getting excuted and that the
freed pages are sane.

Link: http://lkml.kernel.org/r/1502485554-318703-2-git-send-email-pasha.tatashin@oracle.com
Fixes: 7e18adb4 ("mm: meminit: initialise remaining struct pages in parallel with kswapd")
Signed-off-by: default avatarPavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: default avatarSteven Sistare <steven.sistare@oracle.com>
Reviewed-by: default avatarDaniel Jordan <daniel.m.jordan@oracle.com>
Reviewed-by: default avatarBob Picco <bob.picco@oracle.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 768dc4e4
...@@ -61,6 +61,7 @@ extern int memblock_debug; ...@@ -61,6 +61,7 @@ extern int memblock_debug;
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
#define __init_memblock __meminit #define __init_memblock __meminit
#define __initdata_memblock __meminitdata #define __initdata_memblock __meminitdata
void memblock_discard(void);
#else #else
#define __init_memblock #define __init_memblock
#define __initdata_memblock #define __initdata_memblock
...@@ -74,8 +75,6 @@ phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align, ...@@ -74,8 +75,6 @@ phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
int nid, ulong flags); int nid, ulong flags);
phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align); phys_addr_t size, phys_addr_t align);
phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
void memblock_allow_resize(void); void memblock_allow_resize(void);
int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
int memblock_add(phys_addr_t base, phys_addr_t size); int memblock_add(phys_addr_t base, phys_addr_t size);
...@@ -110,6 +109,9 @@ void __next_mem_range_rev(u64 *idx, int nid, ulong flags, ...@@ -110,6 +109,9 @@ void __next_mem_range_rev(u64 *idx, int nid, ulong flags,
void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
phys_addr_t *out_end); phys_addr_t *out_end);
void __memblock_free_early(phys_addr_t base, phys_addr_t size);
void __memblock_free_late(phys_addr_t base, phys_addr_t size);
/** /**
* for_each_mem_range - iterate through memblock areas from type_a and not * for_each_mem_range - iterate through memblock areas from type_a and not
* included in type_b. Or just type_a if type_b is NULL. * included in type_b. Or just type_a if type_b is NULL.
......
...@@ -285,31 +285,27 @@ static void __init_memblock memblock_remove_region(struct memblock_type *type, u ...@@ -285,31 +285,27 @@ static void __init_memblock memblock_remove_region(struct memblock_type *type, u
} }
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
/**
phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info( * Discard memory and reserved arrays if they were allocated
phys_addr_t *addr) */
void __init memblock_discard(void)
{ {
if (memblock.reserved.regions == memblock_reserved_init_regions) phys_addr_t addr, size;
return 0;
*addr = __pa(memblock.reserved.regions); if (memblock.reserved.regions != memblock_reserved_init_regions) {
addr = __pa(memblock.reserved.regions);
return PAGE_ALIGN(sizeof(struct memblock_region) * size = PAGE_ALIGN(sizeof(struct memblock_region) *
memblock.reserved.max); memblock.reserved.max);
} __memblock_free_late(addr, size);
}
phys_addr_t __init_memblock get_allocated_memblock_memory_regions_info(
phys_addr_t *addr)
{
if (memblock.memory.regions == memblock_memory_init_regions)
return 0;
*addr = __pa(memblock.memory.regions);
return PAGE_ALIGN(sizeof(struct memblock_region) * if (memblock.memory.regions == memblock_memory_init_regions) {
addr = __pa(memblock.memory.regions);
size = PAGE_ALIGN(sizeof(struct memblock_region) *
memblock.memory.max); memblock.memory.max);
__memblock_free_late(addr, size);
}
} }
#endif #endif
/** /**
......
...@@ -146,22 +146,6 @@ static unsigned long __init free_low_memory_core_early(void) ...@@ -146,22 +146,6 @@ static unsigned long __init free_low_memory_core_early(void)
NULL) NULL)
count += __free_memory_core(start, end); count += __free_memory_core(start, end);
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
{
phys_addr_t size;
/* Free memblock.reserved array if it was allocated */
size = get_allocated_memblock_reserved_regions_info(&start);
if (size)
count += __free_memory_core(start, start + size);
/* Free memblock.memory array if it was allocated */
size = get_allocated_memblock_memory_regions_info(&start);
if (size)
count += __free_memory_core(start, start + size);
}
#endif
return count; return count;
} }
......
...@@ -1584,6 +1584,10 @@ void __init page_alloc_init_late(void) ...@@ -1584,6 +1584,10 @@ void __init page_alloc_init_late(void)
/* Reinit limits that are based on free pages after the kernel is up */ /* Reinit limits that are based on free pages after the kernel is up */
files_maxfiles_init(); files_maxfiles_init();
#endif #endif
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
/* Discard memblock private memory */
memblock_discard();
#endif
for_each_populated_zone(zone) for_each_populated_zone(zone)
set_zone_contiguous(zone); set_zone_contiguous(zone);
......
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