1 files changed, 14 insertions, 47 deletions

diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index dc9ada64feed..b3c70a612c7a 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -19,12 +19,13 @@
 #include <asm/barrier.h>
 #include <asm/cpufeature.h>
 #include <asm/mte.h>
-#include <asm/mte-kasan.h>
 #include <asm/ptrace.h>
 #include <asm/sysreg.h>
 
 u64 gcr_kernel_excl __ro_after_init;
 
+static bool report_fault_once = true;
+
 static void mte_sync_page_tags(struct page *page, pte_t *ptep, bool check_swap)
 {
 	pte_t old_pte = READ_ONCE(*ptep);
@@ -86,51 +87,6 @@ int memcmp_pages(struct page *page1, struct page *page2)
 	return ret;
 }
 
-u8 mte_get_mem_tag(void *addr)
-{
-	if (!system_supports_mte())
-		return 0xFF;
-
-	asm(__MTE_PREAMBLE "ldg %0, [%0]"
-	    : "+r" (addr));
-
-	return mte_get_ptr_tag(addr);
-}
-
-u8 mte_get_random_tag(void)
-{
-	void *addr;
-
-	if (!system_supports_mte())
-		return 0xFF;
-
-	asm(__MTE_PREAMBLE "irg %0, %0"
-	    : "+r" (addr));
-
-	return mte_get_ptr_tag(addr);
-}
-
-void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag)
-{
-	void *ptr = addr;
-
-	if ((!system_supports_mte()) || (size == 0))
-		return addr;
-
-	/* Make sure that size is MTE granule aligned. */
-	WARN_ON(size & (MTE_GRANULE_SIZE - 1));
-
-	/* Make sure that the address is MTE granule aligned. */
-	WARN_ON((u64)addr & (MTE_GRANULE_SIZE - 1));
-
-	tag = 0xF0 | tag;
-	ptr = (void *)__tag_set(ptr, tag);
-
-	mte_assign_mem_tag_range(ptr, size);
-
-	return ptr;
-}
-
 void mte_init_tags(u64 max_tag)
 {
 	static bool gcr_kernel_excl_initialized;
@@ -158,6 +114,16 @@ void mte_enable_kernel(void)
 	isb();
 }
 
+void mte_set_report_once(bool state)
+{
+	WRITE_ONCE(report_fault_once, state);
+}
+
+bool mte_report_once(void)
+{
+	return READ_ONCE(report_fault_once);
+}
+
 static void update_sctlr_el1_tcf0(u64 tcf0)
 {
 	/* ISB required for the kernel uaccess routines */
@@ -329,11 +295,12 @@ static int __access_remote_tags(struct mm_struct *mm, unsigned long addr,
 		 * would cause the existing tags to be cleared if the page
 		 * was never mapped with PROT_MTE.
 		 */
-		if (!test_bit(PG_mte_tagged, &page->flags)) {
+		if (!(vma->vm_flags & VM_MTE)) {
 			ret = -EOPNOTSUPP;
 			put_page(page);
 			break;
 		}
+		WARN_ON_ONCE(!test_bit(PG_mte_tagged, &page->flags));
 
 		/* limit access to the end of the page */
 		offset = offset_in_page(addr);