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| author | Li Yang <leoli@freescale.com> | 2010-05-07 16:38:34 +0800 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2010-05-17 10:56:16 -0500 |
| commit | 78e2e68a2b79f394b7cd61e07987a8a89af907f7 (patch) | |
| tree | 41b534f2e557503a1d78f01d852e5eb8cb61b95a /arch/powerpc/mm/tlb_nohash_low.S | |
| parent | 4c5ddd52695f7bac6362ad13fd3dc878212d1368 (diff) | |
powerpc/fsl-booke: Fix InstructionTLBError execute permission check
In CONFIG_PTE_64BIT the PTE format has unique permission bits for user
and supervisor execute. However on !CONFIG_PTE_64BIT we overload the
supervisor bit to imply user execute with _PAGE_USER set. This allows
us to use the same permission check mask for user or supervisor code on
!CONFIG_PTE_64BIT.
However, on CONFIG_PTE_64BIT we map _PAGE_EXEC to _PAGE_BAP_UX so we
need a different permission mask based on the fault coming from a kernel
address or user space.
Without unique permission masks we see issues like the following with
modules:
Unable to handle kernel paging request for instruction fetch
Faulting instruction address: 0xf938d040
Oops: Kernel access of bad area, sig: 11 [#1]
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Jin Qing <b24347@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/tlb_nohash_low.S')
0 files changed, 0 insertions, 0 deletions