powerpc/mm: Fix conditions to perform MMU specific management by blocks on PPC32.

commit 4e3319c23a66dabfd6c35f4d2633d64d99b68096 upstream.

Setting init mem to NX shall depend on sinittext being mapped by
block, not on stext being mapped by block.

Setting text and rodata to RO shall depend on stext being mapped by
block, not on sinittext being mapped by block.

Fixes: 63b2bc619565 ("powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7d565fb8f51b18a3d98445a830b2f6548cb2da2a.1589866984.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 784cae9..da9f722 100644 (file)
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -207,7 +207,7 @@ void mark_initmem_nx(void)
        unsigned long numpages = PFN_UP((unsigned long)_einittext) -
                                 PFN_DOWN((unsigned long)_sinittext);
 
-       if (v_block_mapped((unsigned long)_stext + 1))
+       if (v_block_mapped((unsigned long)_sinittext))
                mmu_mark_initmem_nx();
        else
                change_page_attr(page, numpages, PAGE_KERNEL);
@@ -219,7 +219,7 @@ void mark_rodata_ro(void)
        struct page *page;
        unsigned long numpages;
 
-       if (v_block_mapped((unsigned long)_sinittext)) {
+       if (v_block_mapped((unsigned long)_stext + 1)) {
                mmu_mark_rodata_ro();
                ptdump_check_wx();
                return;