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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-18 09:58:02 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-28 06:32:23 -0800
commit744dac7d299be82e4d13b217e81eb4bfee9826a8 (patch)
treee2c00d906bce1c616ceec7c1f6ba888e7b7627b8 /mm
parentdbb694e810c87e7e1760527a783437f26ac5a547 (diff)
mm: fix pageblock bitmap allocation
commit 7c45512df987c5619db041b5c9b80d281e26d3db upstream. Commit c060f943d092 ("mm: use aligned zone start for pfn_to_bitidx calculation") fixed out calculation of the index into the pageblock bitmap when a !SPARSEMEM zome was not aligned to pageblock_nr_pages. However, the _allocation_ of that bitmap had never taken this alignment requirement into accout, so depending on the exact size and alignment of the zone, the use of that index could then access past the allocation, resulting in some very subtle memory corruption. This was reported (and bisected) by Ingo Molnar: one of his random config builds would hang with certain very specific kernel command line options. In the meantime, commit c060f943d092 has been marked for stable, so this fix needs to be back-ported to the stable kernels that backported the commit to use the right alignment. Bisected-and-tested-by: Ingo Molnar <mingo@kernel.org> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0ec869e64369..1b94f0868c2c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4264,10 +4264,11 @@ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
* round what is now in bits to nearest long in bits, then return it in
* bytes.
*/
-static unsigned long __init usemap_size(unsigned long zonesize)
+static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize)
{
unsigned long usemapsize;
+ zonesize += zone_start_pfn & (pageblock_nr_pages-1);
usemapsize = roundup(zonesize, pageblock_nr_pages);
usemapsize = usemapsize >> pageblock_order;
usemapsize *= NR_PAGEBLOCK_BITS;
@@ -4277,17 +4278,19 @@ static unsigned long __init usemap_size(unsigned long zonesize)
}
static void __init setup_usemap(struct pglist_data *pgdat,
- struct zone *zone, unsigned long zonesize)
+ struct zone *zone,
+ unsigned long zone_start_pfn,
+ unsigned long zonesize)
{
- unsigned long usemapsize = usemap_size(zonesize);
+ unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize);
zone->pageblock_flags = NULL;
if (usemapsize)
zone->pageblock_flags = alloc_bootmem_node_nopanic(pgdat,
usemapsize);
}
#else
-static inline void setup_usemap(struct pglist_data *pgdat,
- struct zone *zone, unsigned long zonesize) {}
+static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone,
+ unsigned long zone_start_pfn, unsigned long zonesize) {}
#endif /* CONFIG_SPARSEMEM */
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
@@ -4415,7 +4418,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
continue;
set_pageblock_order(pageblock_default_order());
- setup_usemap(pgdat, zone, size);
+ setup_usemap(pgdat, zone, zone_start_pfn, size);
ret = init_currently_empty_zone(zone, zone_start_pfn,
size, MEMMAP_EARLY);
BUG_ON(ret);