[PATCH v2 1/2] ARM: ioremap: Sync PGDs for VMALLOC shadow

[Linus Walleij <linus.walleij@linaro.org>]

When sync:ing the VMALLOC area to other CPUs, make sure to also
sync the KASAN shadow memory for the VMALLOC area, so that we
don't get stale entries for the shadow memory in the top level PGD.

Since we are now copying PGDs in two instances, create a helper
function named memcpy_pgd() to do the actual copying, and
create a helper to map the addresses of VMALLOC_START and
VMALLOC_END into the corresponding shadow memory.

Cc: stable@vger.kernel.org
Fixes: 565cbaad83d8 ("ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC")
Link: https://lore.kernel.org/linux-arm-kernel/a1a1d062-f3a2-4d05-9836-3b098de9db6d@foss.st.com/
Reported-by: Clement LE GOFFIC <clement.legoffic@foss.st.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Russell King (Oracle) <linux@armlinux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/mm/ioremap.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 794cfea9f9d4..94586015feed 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -23,6 +23,7 @@
  */
 #include <linux/module.h>
 #include <linux/errno.h>
+#include <linux/kasan.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/io.h>
@@ -115,16 +116,32 @@ int ioremap_page(unsigned long virt, unsigned long phys,
 }
 EXPORT_SYMBOL(ioremap_page);
 
+static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
+{
+	return (unsigned long)kasan_mem_to_shadow((void *)addr);
+}
+
+static void memcpy_pgd(struct mm_struct *mm, unsigned long start,
+		       unsigned long end)
+{
+	memcpy(pgd_offset(mm, start), pgd_offset_k(start),
+	       sizeof(pgd_t) * (pgd_index(end) - pgd_index(start)));
+}
+
 void __check_vmalloc_seq(struct mm_struct *mm)
 {
 	int seq;
 
 	do {
 		seq = atomic_read(&init_mm.context.vmalloc_seq);
-		memcpy(pgd_offset(mm, VMALLOC_START),
-		       pgd_offset_k(VMALLOC_START),
-		       sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
-					pgd_index(VMALLOC_START)));
+		memcpy_pgd(mm, VMALLOC_START, VMALLOC_END);
+		if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
+			unsigned long start =
+				arm_kasan_mem_to_shadow(VMALLOC_START);
+			unsigned long end =
+				arm_kasan_mem_to_shadow(VMALLOC_END);
+			memcpy_pgd(mm, start, end);
+		}
 		/*
 		 * Use a store-release so that other CPUs that observe the
 		 * counter's new value are guaranteed to see the results of the

-- 
2.46.2