AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/of
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Mike Rapoport 5c01a25a21 of: fix kmemleak crash caused by imbalance in early memory reservation 
Marc Gonzalez reported the following kmemleak crash:

  Unable to handle kernel paging request at virtual address ffffffc021e00000
  Mem abort info:
    ESR = 0x96000006
    Exception class = DABT (current EL), IL = 32 bits
    SET = 0, FnV = 0
    EA = 0, S1PTW = 0
  Data abort info:
    ISV = 0, ISS = 0x00000006
    CM = 0, WnR = 0
  swapper pgtable: 4k pages, 39-bit VAs, pgdp = (____ptrval____) [ffffffc021e00000] pgd=000000017e3ba803, pud=000000017e3ba803, pmd=0000000000000000
  Internal error: Oops: 96000006 [#1] PREEMPT SMP
  Modules linked in:
  CPU: 6 PID: 523 Comm: kmemleak Tainted: G S      W         5.0.0-rc1 #13
  Hardware name: Qualcomm Technologies, Inc. MSM8998 v1 MTP (DT)
  pstate: 80000085 (Nzcv daIf -PAN -UAO)
  pc : scan_block+0x70/0x190
  lr : scan_block+0x6c/0x190
  Process kmemleak (pid: 523, stack limit = 0x(____ptrval____))
  Call trace:
   scan_block+0x70/0x190
   scan_gray_list+0x108/0x1c0
   kmemleak_scan+0x33c/0x7c0
   kmemleak_scan_thread+0x98/0xf0
   kthread+0x11c/0x120
   ret_from_fork+0x10/0x1c
  Code: f9000fb4 d503201f 97ffffd2 35000580 (f9400260)

The crash happens when a no-map area is allocated in
early_init_dt_alloc_reserved_memory_arch().  The allocated region is
registered with kmemleak, but it is then removed from memblock using
memblock_remove() that is not kmemleak-aware.

Replacing memblock_phys_alloc_range() with memblock_find_in_range()
makes sure that the allocated memory is not added to kmemleak and then
memblock_remove()'ing this memory is safe.

As a bonus, since memblock_find_in_range() ensures the allocation in the
specified range, the bounds check can be removed.

[rppt@linux.ibm.com: of: fix parameters order for call to memblock_find_in_range()]
  Link: http://lkml.kernel.org/r/20190221112619.GC32004@rapoport-lnx
Link: http://lkml.kernel.org/r/20190213181921.GB15270@rapoport-lnx
Fixes: 3f0c820664 ("drivers: of: add initialization code for dynamic reserved memory")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Prateek Patel <prpatel@nvidia.com>
Tested-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-03-12 10:04:02 -07:00
..
unittest-data
address.c
base.c
device.c
dynamic.c of: Remove struct device_node.type pointer 2019-01-10 16:24:44 -06:00
fdt_address.c
fdt.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
irq.c
Kconfig dma-mapping: improve selection of dma_declare_coherent availability 2019-02-20 07:26:35 -07:00
kobj.c
Makefile
of_mdio.c net: phy: fixed-phy: Drop GPIO from fixed_phy_add() 2019-02-04 18:33:36 -08:00
of_net.c
of_numa.c
of_private.h
of_reserved_mem.c of: fix kmemleak crash caused by imbalance in early memory reservation 2019-03-12 10:04:02 -07:00
overlay.c of: Remove struct device_node.type pointer 2019-01-10 16:24:44 -06:00
pdt.c of: Remove struct device_node.type pointer 2019-01-10 16:24:44 -06:00
platform.c
property.c OF: properties: add missing of_node_put 2019-01-16 12:49:53 -06:00
resolver.c
unittest.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00