mm/kasan: Switch to using __pa_symbol and lm_alias

__pa_symbol is the correct API to find the physical address of symbols.
Switch to it to allow for debugging APIs to work correctly. Other
functions such as p*d_populate may call __pa internally. Ensure that the
address passed is in the linear region by calling lm_alias.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c
index 3f9a41cf0ac6..31238dad85fb 100644
--- a/mm/kasan/kasan_init.c
+++ b/mm/kasan/kasan_init.c
@@ -15,6 +15,7 @@
 #include <linux/kasan.h>
 #include <linux/kernel.h>
 #include <linux/memblock.h>
+#include <linux/mm.h>
 #include <linux/pfn.h>
 
 #include <asm/page.h>
@@ -49,7 +50,7 @@ static void __init zero_pte_populate(pmd_t *pmd, unsigned long addr,
         pte_t *pte = pte_offset_kernel(pmd, addr);
         pte_t zero_pte;
 
-        zero_pte = pfn_pte(PFN_DOWN(__pa(kasan_zero_page)), PAGE_KERNEL);
+        zero_pte = pfn_pte(PFN_DOWN(__pa_symbol(kasan_zero_page)), PAGE_KERNEL);
         zero_pte = pte_wrprotect(zero_pte);
 
         while (addr + PAGE_SIZE <= end) {
@@ -69,7 +70,7 @@ static void __init zero_pmd_populate(pud_t *pud, unsigned long addr,
                 next = pmd_addr_end(addr, end);
 
                 if (IS_ALIGNED(addr, PMD_SIZE) && end - addr >= PMD_SIZE) {
-                        pmd_populate_kernel(&init_mm, pmd, kasan_zero_pte);
+                        pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte));
                         continue;
                 }
 
@@ -92,9 +93,9 @@ static void __init zero_pud_populate(pgd_t *pgd, unsigned long addr,
                 if (IS_ALIGNED(addr, PUD_SIZE) && end - addr >= PUD_SIZE) {
                         pmd_t *pmd;
 
-                        pud_populate(&init_mm, pud, kasan_zero_pmd);
+                        pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
                         pmd = pmd_offset(pud, addr);
-                        pmd_populate_kernel(&init_mm, pmd, kasan_zero_pte);
+                        pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte));
                         continue;
                 }
 
@@ -135,11 +136,11 @@ void __init kasan_populate_zero_shadow(const void *shadow_start,
                          * puds,pmds, so pgd_populate(), pud_populate()
                          * is noops.
                          */
-                        pgd_populate(&init_mm, pgd, kasan_zero_pud);
+                        pgd_populate(&init_mm, pgd, lm_alias(kasan_zero_pud));
                         pud = pud_offset(pgd, addr);
-                        pud_populate(&init_mm, pud, kasan_zero_pmd);
+                        pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
                         pmd = pmd_offset(pud, addr);
-                        pmd_populate_kernel(&init_mm, pmd, kasan_zero_pte);
+                        pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte));
                         continue;
                 }