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5e5be3aed2
linux_dsm_epyc7002/arch/powerpc/mm
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Michael Ellerman 5e5be3aed2 powerpc/mm: Detect bad KUAP faults 
When KUAP is enabled we have logic to detect page faults that occur
outside of a valid user access region and are blocked by the AMR.

What we don't have at the moment is logic to detect a fault *within* a
valid user access region, that has been incorrectly blocked by AMR.
This is not meant to ever happen, but it can if we incorrectly
save/restore the AMR, or if the AMR was overwritten for some other
reason.

Currently if that happens we assume it's just a regular fault that
will be corrected by handling the fault normally, so we just return.
But there is nothing the fault handling code can do to fix it, so the
fault just happens again and we spin forever, leading to soft lockups.

So add some logic to detect that case and WARN() if we ever see it.
Arguably it should be a BUG(), but it's more polite to fail the access
and let the kernel continue, rather than taking down the box. There
should be no data integrity issue with failing the fault rather than
BUG'ing, as we're just going to disallow an access that should have
been allowed.

To make the code a little easier to follow, unroll the condition at
the end of bad_kernel_fault() and comment each case, before adding the
call to bad_kuap_fault().

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-04-21 23:06:04 +10:00
..
ptdump powerpc/mm: Check secondary hash page table 2019-03-02 14:43:05 +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 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/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32 2019-03-19 00:30:19 +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: move warning from resize_hpt_for_hotplug() 2019-04-20 22:02:26 +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: move warning from resize_hpt_for_hotplug() 2019-04-20 22:02:26 +10:00
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/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: use pte helpers in generic code 2018-10-14 18:04:09 +11:00
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: handover page flags with a pgprot_t parameter 2018-10-14 18:04:09 +11:00
pgtable-radix.c powerpc/64s: Implement KUAP for Radix MMU 2019-04-21 23:06:02 +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 treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
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/hash: Handle mmap_min_addr correctly in get_unmapped_area topdown search 2019-02-26 16:26:29 +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