powerpc/603: Fix protection of user pages mapped with PROT_NONE

On book3s/32, page protection is defined by the PP bits in the PTE
which provide the following protection depending on the access
keys defined in the matching segment register:
- PP 00 means RW with key 0 and N/A with key 1.
- PP 01 means RW with key 0 and RO with key 1.
- PP 10 means RW with both key 0 and key 1.
- PP 11 means RO with both key 0 and key 1.

Since the implementation of kernel userspace access protection,
PP bits have been set as follows:
- PP00 for pages without _PAGE_USER
- PP01 for pages with _PAGE_USER and _PAGE_RW
- PP11 for pages with _PAGE_USER and without _PAGE_RW

For kernelspace segments, kernel accesses are performed with key 0
and user accesses are performed with key 1. As PP00 is used for
non _PAGE_USER pages, user can't access kernel pages not flagged
_PAGE_USER while kernel can.

For userspace segments, both kernel and user accesses are performed
with key 0, therefore pages not flagged _PAGE_USER are still
accessible to the user.

This shouldn't be an issue, because userspace is expected to be
accessible to the user. But unlike most other architectures, powerpc
implements PROT_NONE protection by removing _PAGE_USER flag instead of
flagging the page as not valid. This means that pages in userspace
that are not flagged _PAGE_USER shall remain inaccessible.

To get the expected behaviour, just mimic other architectures in the
TLB miss handler by checking _PAGE_USER permission on userspace
accesses as if it was the _PAGE_PRESENT bit.

Note that this problem only is only for 603 cores. The 604+ have
an hash table, and hash_page() function already implement the
verification of _PAGE_USER permission on userspace pages.

Fixes: f342adca3afc ("powerpc/32s: Prepare Kernel Userspace Access Protection")
Cc: stable@vger.kernel.org # v5.2+
Reported-by: Christoph Plattner <christoph.plattner@thalesgroup.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4a0c6e3bb8f0c162457bf54d9bc6fd8d7b55129f.1612160907.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 727fdab..565e84e 100644 (file)
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -457,11 +457,12 @@ InstructionTLBMiss:
        cmplw   0,r1,r3
 #endif
        mfspr   r2, SPRN_SDR1
-       li      r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
+       li      r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC | _PAGE_USER
        rlwinm  r2, r2, 28, 0xfffff000
 #ifdef CONFIG_MODULES
        bgt-    112f
        lis     r2, (swapper_pg_dir - PAGE_OFFSET)@ha   /* if kernel address, use */
+       li      r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
        addi    r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l        /* kernel page table */
 #endif
 112:   rlwimi  r2,r3,12,20,29          /* insert top 10 bits of address */
@@ -520,10 +521,11 @@ DataLoadTLBMiss:
        lis     r1, TASK_SIZE@h         /* check if kernel address */
        cmplw   0,r1,r3
        mfspr   r2, SPRN_SDR1
-       li      r1, _PAGE_PRESENT | _PAGE_ACCESSED
+       li      r1, _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER
        rlwinm  r2, r2, 28, 0xfffff000
        bgt-    112f
        lis     r2, (swapper_pg_dir - PAGE_OFFSET)@ha   /* if kernel address, use */
+       li      r1, _PAGE_PRESENT | _PAGE_ACCESSED
        addi    r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l        /* kernel page table */
 112:   rlwimi  r2,r3,12,20,29          /* insert top 10 bits of address */
        lwz     r2,0(r2)                /* get pmd entry */
@@ -597,10 +599,11 @@ DataStoreTLBMiss:
        lis     r1, TASK_SIZE@h         /* check if kernel address */
        cmplw   0,r1,r3
        mfspr   r2, SPRN_SDR1
-       li      r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED
+       li      r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER
        rlwinm  r2, r2, 28, 0xfffff000
        bgt-    112f
        lis     r2, (swapper_pg_dir - PAGE_OFFSET)@ha   /* if kernel address, use */
+       li      r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED
        addi    r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l        /* kernel page table */
 112:   rlwimi  r2,r3,12,20,29          /* insert top 10 bits of address */
        lwz     r2,0(r2)                /* get pmd entry */