AuxXxilium/linux_dsm_epyc7002
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2c474c0350
linux_dsm_epyc7002/arch/powerpc/mm
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Aneesh Kumar K.V 2c474c0350 powerpc/mm/radix: Fix kernel crash when running subpage protect test 
This patch fixes the below crash by making sure we touch the subpage
protection related structures only if we know they are allocated on
the platform. With radix translation we don't allocate hash context at
all and trying to access subpage_prot_table results in:

  Faulting instruction address: 0xc00000000008bdb4
  Oops: Kernel access of bad area, sig: 11 [#1]
  LE PAGE_SIZE=64K MMU=Radix MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
  ....
  NIP [c00000000008bdb4] sys_subpage_prot+0x74/0x590
  LR [c00000000000b688] system_call+0x5c/0x70
  Call Trace:
  [c00020002c6b7d30] [c00020002c6b7d90] 0xc00020002c6b7d90 (unreliable)
  [c00020002c6b7e20] [c00000000000b688] system_call+0x5c/0x70
  Instruction dump:
  fb61ffd8 fb81ffe0 fba1ffe8 fbc1fff0 fbe1fff8 f821ff11 e92d1178 f9210068
  39200000 e92d0968 ebe90630 e93f03e8 <eb891038> 60000000 3860fffe e9410068

We also move the subpage_prot_table with mmp_sem held to avoid race
between two parallel subpage_prot syscall.

Fixes: 701101865f ("powerpc/mm: Reduce memory usage for mm_context_t for radix")
Reported-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-01 23:01:33 +10:00
..
ptdump powerpc/mm/hash64: Map all the kernel regions in the same 0xc range 2019-04-21 23:12:39 +10:00
8xx_mmu.c powerpc/8xx: Add Kernel Userspace Access Protection 2019-04-21 23:11:46 +10:00
40x_mmu.c powerpc/mm/32: add base address to mmu_mapin_ram() 2019-02-23 21:04:31 +11:00
44x_mmu.c powerpc/mm/32: add base address to mmu_mapin_ram() 2019-02-23 21:04:31 +11:00
copro_fault.c powerpc/mm/hash: Rename KERNEL_REGION_ID to LINEAR_MAP_REGION_ID 2019-04-21 23:12:40 +10:00
dma-noncoherent.c powerpc/dma: use the generic direct mapping bypass 2019-02-18 22:41:04 +11:00
drmem.c powerpc/pseries: Track LMB nid instead of using device tree 2019-04-29 22:27:16 +10:00
fault.c powerpc/mm: Detect bad KUAP faults 2019-04-21 23:06:04 +10:00
fsl_booke_mmu.c powerpc/mm/32: add base address to mmu_mapin_ram() 2019-02-23 21:04:31 +11:00
hash64_4k.c powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group 2018-07-24 22:03:17 +10:00
hash64_64k.c powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group 2018-07-24 22:03:17 +10:00
hash_low_32.S powerpc/32s: Prepare Kernel Userspace Access Protection 2019-04-21 23:11:46 +10:00
hash_native_64.c powerpc/64s/hash: Do not use PPC_INVALIDATE_ERAT on CPUs before POWER9 2018-10-04 23:16:53 +10:00
hash_utils_64.c powerpc/mm: fix spelling mistake "Outisde" -> "Outside" 2019-04-28 16:28:23 +10:00
highmem.c powerpc/highmem: Change BUG_ON() to WARN_ON() 2019-04-20 22:02:11 +10:00
hugepage-hash64.c arch/powerpc/mm/hash: validate the pte entries before handling the hash fault 2018-10-03 15:39:59 +10:00
hugetlbpage-book3e.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hugetlbpage-hash64.c powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
hugetlbpage-radix.c powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
hugetlbpage.c powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
init_32.c powerpc: Add framework for Kernel Userspace Protection 2019-04-21 23:05:54 +10:00
init_64.c powerpc/mm: fix "section_base" set but not used 2019-03-02 14:43:05 +11:00
init-common.c powerpc/64: Setup KUP on secondary CPUs 2019-04-21 23:05:59 +10:00
Makefile powerpc/mm: Disable kcov for SLB routines 2019-03-12 14:06:12 +11:00
mem.c powerpc/mm: Fix section mismatch warning 2019-04-21 23:12:40 +10:00
mmap.c exec: pass stack rlimit into mm layout functions 2018-04-11 10:28:37 -07:00
mmu_context_book3s64.c powerc/mm/hash: Reduce hash_mm_context size 2019-04-21 23:12:39 +10:00
mmu_context_hash32.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
mmu_context_iommu.c powerpc/mm/iommu: allow large IOMMU page size only for hugetlb backing 2019-03-05 21:07:19 -08:00
mmu_context_nohash.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
mmu_context.c powerpc/mm: Extend pte_fragment functionality to PPC32 2018-12-04 19:45:01 +11:00
mmu_decl.h powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
numa.c powerpc/numa: document topology_updates_enabled, disable by default 2019-04-20 22:03:59 +10:00
pgtable_32.c powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
pgtable_64.c powerpc/mm: fix spelling mistake "Outisde" -> "Outside" 2019-04-28 16:28:23 +10:00
pgtable-book3e.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pgtable-book3s64.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pgtable-frag.c mm: treewide: remove unused address argument from pte_alloc functions 2019-01-04 13:13:47 -08:00
pgtable-hash64.c powerpc/mm: fix spelling mistake "Outisde" -> "Outside" 2019-04-28 16:28:23 +10:00
pgtable-radix.c powerpc/mm: fix spelling mistake "Outisde" -> "Outside" 2019-04-28 16:28:23 +10:00
pgtable.c powerpc/mm: add exec protection on powerpc 603 2018-12-19 18:56:32 +11:00
pkeys.c powerpc/64s: Implement KUAP for Radix MMU 2019-04-21 23:06:02 +10:00
ppc_mmu_32.c powerpc/32s: Implement Kernel Userspace Access Protection 2019-04-21 23:11:47 +10:00
slb.c powerpc/mm/hash: Rename KERNEL_REGION_ID to LINEAR_MAP_REGION_ID 2019-04-21 23:12:40 +10:00
slice.c powerpc/mm: Add helpers for accessing hash translation related variables 2019-04-21 23:12:38 +10:00
subpage-prot.c powerpc/mm/radix: Fix kernel crash when running subpage protect test 2019-05-01 23:01:33 +10:00
tlb_hash32.c powerpc/sparse: Fix plain integer as NULL pointer warning 2018-05-25 12:04:38 +10:00
tlb_hash64.c powerpc/mm: Add support for handling > 512TB address in SLB miss 2018-03-31 00:10:38 +11:00
tlb_low_64e.S powerpc/fsl: Flush the branch predictor at each kernel entry (64bit) 2018-12-20 22:59:03 +11:00
tlb_nohash_low.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
tlb_nohash.c powerpc/mm: Move slb_addr_linit to early_init_mmu 2019-04-21 23:12:39 +10:00
tlb-radix.c powerpc updates for 4.20 2018-10-26 14:36:21 -07:00
vphn.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vphn.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00