[PATCH v2] arm64: mte: Ensure the cleared tags are visible before setting the PTE

[Catalin Marinas]

As an optimisation, only pages mapped with PROT_MTE in user space have
the MTE tags zeroed. This is done lazily at the set_pte_at() time via
mte_sync_tags(). However, this function is missing a barrier and another
CPU may see the PTE updated before the zeroed tags are visible. Add an
smp_wmb() barrier if the mapping is Normal Tagged.

Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Fixes: 34bfeea4a9e9 ("arm64: mte: Clear the tags when a page is mapped in user-space with PROT_MTE")
Cc: <stable at vger.kernel.org> # 5.10.x
Reported-by: Vladimir Murzin <vladimir.murzin at arm.com>
Cc: Will Deacon <will at kernel.org>
---

Changes in v2:
- make the barrier unconditional
- not including reviewed-by, tested-by tags for v1 as the patch is slightly
  different

 arch/arm64/kernel/mte.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 90994aca54f3..d565ae25e48f 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -67,6 +67,9 @@ void mte_sync_tags(pte_t old_pte, pte_t pte)
 			mte_sync_page_tags(page, old_pte, check_swap,
 					   pte_is_tagged);
 	}
+
+	/* ensure the tags are visible before the PTE is set */
+	smp_wmb();
 }
 
 int memcmp_pages(struct page *page1, struct page *page2)