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powerpc fixes for 4.15 #6

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Just one fix to correctly return SEGV_ACCERR when we take a SEGV on a mapped
 region. The bug was introduced in the refactoring of the page fault handler we
 did in the previous release.
 
 Thanks to:
   John Sperbeck.
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Merge tag 'powerpc-4.15-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fix from Michael Ellerman:
 "Just one fix to correctly return SEGV_ACCERR when we take a SEGV on a
  mapped region. The bug was introduced in the refactoring of the page
  fault handler we did in the previous release.

  Thanks to John Sperbeck"

* tag 'powerpc-4.15-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm: Fix SEGV on mapped region to return SEGV_ACCERR
This commit is contained in:
Linus Torvalds 2018-01-06 09:48:27 -08:00
commit 3219e264b9
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/mm/fault.c
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@ -145,6 +145,11 @@ static noinline int bad_area(struct pt_regs *regs, unsigned long address)
return __bad_area(regs, address, SEGV_MAPERR);
}
static noinline int bad_access(struct pt_regs *regs, unsigned long address)
{
return __bad_area(regs, address, SEGV_ACCERR);
}
static int do_sigbus(struct pt_regs *regs, unsigned long address,
unsigned int fault)
{
@ -490,7 +495,7 @@ retry:
good_area:
if (unlikely(access_error(is_write, is_exec, vma)))
return bad_area(regs, address);
return bad_access(regs, address);
/*
* If for any reason at all we couldn't handle the fault,