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powerpc fixes for 5.8 #5

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One fix for a regression in our pkey handling, which exhibits as PROT_EXEC
 mappings taking continuous page faults.
 
 Thanks to:
   Jan Stancek, Aneesh Kumar K.V.
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Merge tag 'powerpc-5.8-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "One fix for a regression in our pkey handling, which exhibits as
  PROT_EXEC mappings taking continuous page faults.

  Thanks to: Jan Stancek, Aneesh Kumar K.V"

* tag 'powerpc-5.8-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm/pkeys: Make pkey access check work on execute_only_key
This commit is contained in:
Linus Torvalds 2020-07-04 14:46:11 -07:00
commit 9bc0b029a8
1 changed files with 0 additions and 3 deletions
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3
arch/powerpc/mm/book3s64/pkeys.c
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@ -353,9 +353,6 @@ static bool pkey_access_permitted(int pkey, bool write, bool execute)
int pkey_shift;
u64 amr;
if (!is_pkey_enabled(pkey))
return true;
pkey_shift = pkeyshift(pkey);
if (execute && !(read_iamr() & (IAMR_EX_BIT << pkey_shift)))
return true;