The patch titled Subject: mm/memblock: fix overlapping allocation when doubling reserved array has been removed from the -mm tree. Its filename was mm-memblock-fix-overlapping-allocation-when-doubling-reserved-array.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ From: Greg Pearson <greg.pearson@xxxxxx> Subject: mm/memblock: fix overlapping allocation when doubling reserved array __alloc_memory_core_early() asks memblock for a range of memory then try to reserve it. If the reserved region array lacks space for the new range, memblock_double_array() is called to allocate more space for the array. If memblock is used to allocate memory for the new array it can end up using a range that overlaps with the range originally allocated in __alloc_memory_core_early(), leading to possible data corruption. With this patch memblock_double_array() now calls memblock_find_in_range() with a narrowed candidate range (in cases where the reserved.regions array is being doubled) so any memory allocated will not overlap with the original range that was being reserved. The range is narrowed by passing in the starting address and size of the previously allocated range. Then the range above the ending address is searched and if a candidate is not found, the range below the starting address is searched. Signed-off-by: Greg Pearson <greg.pearson@xxxxxx> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memblock.c | 36 ++++++++++++++++++++++++++++++++---- 1 file changed, 32 insertions(+), 4 deletions(-) diff -puN mm/memblock.c~mm-memblock-fix-overlapping-allocation-when-doubling-reserved-array mm/memblock.c --- a/mm/memblock.c~mm-memblock-fix-overlapping-allocation-when-doubling-reserved-array +++ a/mm/memblock.c @@ -184,7 +184,24 @@ static void __init_memblock memblock_rem } } -static int __init_memblock memblock_double_array(struct memblock_type *type) +/** + * memblock_double_array - double the size of the memblock regions array + * @type: memblock type of the regions array being doubled + * @new_area_start: starting address of memory range to avoid overlap with + * @new_area_size: size of memory range to avoid overlap with + * + * Double the size of the @type regions array. If memblock is being used to + * allocate memory for a new reserved regions array and there is a previously + * allocated memory range [@new_area_start,@new_area_start+@new_area_size] + * waiting to be reserved, ensure the memory used by the new array does + * not overlap. + * + * RETURNS: + * 0 on success, -1 on failure. + */ +static int __init_memblock memblock_double_array(struct memblock_type *type, + phys_addr_t new_area_start, + phys_addr_t new_area_size) { struct memblock_region *new_array, *old_array; phys_addr_t old_size, new_size, addr; @@ -222,7 +239,18 @@ static int __init_memblock memblock_doub new_array = kmalloc(new_size, GFP_KERNEL); addr = new_array ? __pa(new_array) : 0; } else { - addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t)); + /* only exclude range when trying to double reserved.regions */ + if (type != &memblock.reserved) + new_area_start = new_area_size = 0; + + addr = memblock_find_in_range(new_area_start + new_area_size, + memblock.current_limit, + new_size, sizeof(phys_addr_t)); + if (!addr && new_area_size) + addr = memblock_find_in_range(0, + min(new_area_start, memblock.current_limit), + new_size, sizeof(phys_addr_t)); + new_array = addr ? __va(addr) : 0; } if (!addr) { @@ -399,7 +427,7 @@ repeat: */ if (!insert) { while (type->cnt + nr_new > type->max) - if (memblock_double_array(type) < 0) + if (memblock_double_array(type, obase, size) < 0) return -ENOMEM; insert = true; goto repeat; @@ -450,7 +478,7 @@ static int __init_memblock memblock_isol /* we'll create at most two more regions */ while (type->cnt + 2 > type->max) - if (memblock_double_array(type) < 0) + if (memblock_double_array(type, base, size) < 0) return -ENOMEM; for (i = 0; i < type->cnt; i++) { _ Patches currently in -mm which might be from greg.pearson@xxxxxx are origin.patch mm-memblockc-memblock_double_array-cosmetic-cleanups.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html