[v2,15/19] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files
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Message ID 20200226180526.3272848-16-catalin.marinas@arm.com
State New
Headers show
  • arm64: Memory Tagging Extension user-space support
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Commit Message

Catalin Marinas Feb. 26, 2020, 6:05 p.m. UTC
Since arm64 memory (allocation) tags can only be stored in RAM, mapping
files with PROT_MTE is not allowed by default. RAM-based files like
those in a tmpfs mount or memfd_create() can support memory tagging, so
update the vm_flags accordingly in shmem_mmap().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 mm/shmem.c | 3 +++
 1 file changed, 3 insertions(+)

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diff --git a/mm/shmem.c b/mm/shmem.c
index c8f7540ef048..afd050ac7f8d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2226,6 +2226,9 @@  static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
 			vma->vm_flags &= ~(VM_MAYWRITE);
+	/* arm64 - allow memory tagging on RAM-based files */
+	vma->vm_flags |= VM_MTE_ALLOWED;
 	vma->vm_ops = &shmem_vm_ops;