]> git.karo-electronics.de Git - karo-tx-linux.git/commit
powerpc/fsl-booke: Fix InstructionTLBError execute permission check
authorLi Yang <leoli@freescale.com>
Fri, 7 May 2010 08:38:34 +0000 (16:38 +0800)
committerKumar Gala <galak@kernel.crashing.org>
Mon, 17 May 2010 15:56:16 +0000 (10:56 -0500)
commit78e2e68a2b79f394b7cd61e07987a8a89af907f7
tree41b534f2e557503a1d78f01d852e5eb8cb61b95a
parent4c5ddd52695f7bac6362ad13fd3dc878212d1368
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>
arch/powerpc/kernel/head_fsl_booke.S