1. 06 Apr, 2017 1 commit
    • Stephen Boyd's avatar
      arm64: print a fault message when attempting to write RO memory · b824b930
      Stephen Boyd authored
      If a page is marked read only we should print out that fact,
      instead of printing out that there was a page fault. Right now we
      get a cryptic error message that something went wrong with an
      unhandled fault, but we don't evaluate the esr to figure out that
      it was a read/write permission fault.
      
      Instead of seeing:
      
        Unable to handle kernel paging request at virtual address ffff000008e460d8
        pgd = ffff800003504000
        [ffff000008e460d8] *pgd=0000000083473003, *pud=0000000083503003, *pmd=0000000000000000
        Internal error: Oops: 9600004f [#1] PREEMPT SMP
      
      we'll see:
      
        Unable to handle kernel write to read-only memory at virtual address ffff000008e760d8
        pgd = ffff80003d3de000
        [ffff000008e760d8] *pgd=0000000083472003, *pud=0000000083435003, *pmd=0000000000000000
        Internal error: Oops: 9600004f [#1] PREEMPT SMP
      
      We also add a userspace address check into is_permission_fault()
      so that the function doesn't return true for ttbr0 PAN faults
      when it shouldn't.
      Reviewed-by: default avatarJames Morse <james.morse@arm.com>
      Tested-by: default avatarJames Morse <james.morse@arm.com>
      Acked-by: default avatarLaura Abbott <labbott@redhat.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarStephen Boyd <stephen.boyd@linaro.org>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      b824b930
  2. 05 Apr, 2017 14 commits
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  4. 30 Mar, 2017 2 commits
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  6. 23 Mar, 2017 9 commits