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5330367fa3
linux_dsm_epyc7002/arch/powerpc/mm
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Aneesh Kumar K.V 5330367fa3 powerpc/hugetlb: Handle mmap_min_addr correctly in get_unmapped_area callback 
After we ALIGN up the address we need to make sure we didn't overflow
and resulted in zero address. In that case, we need to make sure that
the returned address is greater than mmap_min_addr.

This fixes selftest va_128TBswitch --run-hugetlb reporting failures when
run as non root user for

mmap(-1, MAP_HUGETLB)

The bug is that a non-root user requesting address -1 will be given address 0
which will then fail, whereas they should have been given something else that
would have succeeded.

We also avoid the first mmap(-1, MAP_HUGETLB) returning NULL address as mmap address
with this change. So we think this is not a security issue, because it only affects
whether we choose an address below mmap_min_addr, not whether we
actually allow that address to be mapped. ie. there are existing capability
checks to prevent a user mapping below mmap_min_addr and those will still be
honoured even without this fix.

Fixes: 484837601d ("powerpc/mm: Add radix support for hugetlb")
Reviewed-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-02-26 16:26:28 +11:00
..
ptdump powerpc: Move page table dump files in a dedicated subdirectory 2019-02-22 22:29:22 +11:00
8xx_mmu.c powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
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 mm: convert return type of handle_mm_fault() caller to vm_fault_t 2018-08-17 16:20:28 -07:00
dma-noncoherent.c powerpc/dma: use the generic direct mapping bypass 2019-02-18 22:41:04 +11:00
drmem.c powerpc/mm/drmem: Fix unexpected flag value in ibm,dynamic-memory-v2 2018-02-23 16:45:51 +11:00
fault.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
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/32: Remove CURRENT_THREAD_INFO and rename TI_CPU 2019-02-23 22:31:40 +11:00
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 debugfs_simple_attr.cocci warnings 2019-01-14 20:39:27 +11:00
highmem.c powerpc/mm: remove warning about ‘type’ being set 2018-08-10 22:12:38 +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 arch/powerpc/mm/hash: validate the pte entries before handling the hash fault 2018-10-03 15:39:59 +10:00
hugetlbpage-radix.c powerpc/hugetlb: Handle mmap_min_addr correctly in get_unmapped_area callback 2019-02-26 16:26:28 +11:00
hugetlbpage.c powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
init_32.c powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
init_64.c powerpc/mm: Fallback to RAM if the altmap is unusable 2018-12-09 21:33:21 +11:00
init-common.c powerpc/mm: remove unnecessary test in pgtable_cache_init() 2018-12-04 19:45:01 +11:00
Makefile powerpc: Enable kcov 2019-02-23 21:04:32 +11:00
mem.c Merge branch 'topic/dma' into next 2019-02-21 23:15:10 +11:00
mmap.c exec: pass stack rlimit into mm layout functions 2018-04-11 10:28:37 -07:00
mmu_context_book3s64.c powerpc/mm: Move pte_fragment_alloc() to a common location 2018-12-04 19:45:01 +11:00
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/vfio/iommu/kvm: Do not pin device memory 2018-12-21 16:20:46 +11:00
mmu_context_nohash.c powerpc/mm: define an empty slice_init_new_context_exec() 2018-12-19 18:56:32 +11:00
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/pseries: Perform full re-add of CPU for topology update post-migration 2019-01-30 23:28:56 +11:00
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: use pte helpers in generic code 2018-10-14 18:04:09 +11:00
pgtable-book3e.c powerpc: handover page flags with a pgprot_t parameter 2018-10-14 18:04:09 +11:00
pgtable-book3s64.c powerpc/radix: Fix kernel crash with mremap() 2019-01-31 20:10:15 +11:00
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: handover page flags with a pgprot_t parameter 2018-10-14 18:04:09 +11:00
pgtable-radix.c powerpc/mm/radix: Display if mappings are exec or not 2018-10-20 13:26:47 +11:00
pgtable.c powerpc/mm: add exec protection on powerpc 603 2018-12-19 18:56:32 +11:00
pkeys.c powerpc/pkeys: Fix handling of pkey state across fork() 2018-12-21 14:46:50 +11:00
ppc_mmu_32.c powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
slb.c powerpc/64s/hash: Fix assert_slb_presence() use of the slbfee. instruction 2019-02-22 00:10:14 +11:00
slice.c powerpc/mm: fix always true/false warning in slice.c 2018-10-20 13:26:47 +11:00
subpage-prot.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
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: remove unnecessary unlikely() 2019-01-15 11:38:05 +11:00
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