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cxl: Fix DAR check & use REGION_ID instead of opencoding

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The current code will set _PAGE_USER to the access flags for any
fault address, because the ~ operation will be true for all address we
take a fault on. But setting _PAGE_USER also means that the fault will
be handled only if the page table have _PAGE_USER set. Hence there is
no security hole with the current code.

Now if it is an user space access, then the change in this patch really
don't have an impact because we have (!ctx->kernel) set true
and we take the if condition true.

Now kernel context created fault on an address in the kernel range
will result in a fault loop because we will not insert the
hash pte due to access and pte permission mismatch. This patch fix
the above issue.

Fixes: f204e0b8ce ("cxl: Driver code for powernv PCIe based cards for userspace access")
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-04-20 03:59:47 -04:00 committed by Michael Ellerman
parent 4aec6ec0da
commit 3b1dbfa14f
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/cxl/fault.c
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@ -152,7 +152,7 @@ static void cxl_handle_page_fault(struct cxl_context *ctx,
access = _PAGE_PRESENT;
if (dsisr & CXL_PSL_DSISR_An_S)
access |= _PAGE_RW;
if ((!ctx->kernel) || ~(dar & (1ULL << 63)))
if ((!ctx->kernel) || (REGION_ID(dar) == USER_REGION_ID))
access |= _PAGE_USER;
if (dsisr & DSISR_NOHPTE)