x86/mm: Fix pti_clone_entry_text() for i386

While x86_64 has PMD aligned text sections, i386 does not have this
luxery. Notably ALIGN_ENTRY_TEXT_END is empty and _etext has PAGE
alignment.

This means that text on i386 can be page granular at the tail end,
which in turn means that the PTI text clones should consistently
account for this.

Make pti_clone_entry_text() consistent with pti_clone_kernel_text().

Fixes: 16a3fe634f6a ("x86/mm/pti: Clone kernel-image on PTE level for 32 bit")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 48c503208c794d0ba25d52036f9a9cfe42201d01..bfdf5f45b13704a4a213a9bb8177a98fe3628c05 100644 (file)
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -496,7 +496,7 @@ static void pti_clone_entry_text(void)
 {
        pti_clone_pgtable((unsigned long) __entry_text_start,
                          (unsigned long) __entry_text_end,
-                         PTI_CLONE_PMD);
+                         PTI_LEVEL_KERNEL_IMAGE);
 }
 
 /*