[linux-morello] [PATCH v4 5/7] aio: Allow capability tag access on the shared memory

The aio_ring buffer is a shared memory region that hosts the io_event array. The io_event struct may contain user pointers, so the memory region must be allowed to store and load capability pointers in PCuABI.

Signed-off-by: Tudor Cretu tudor.cretu@arm.com --- fs/aio.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/fs/aio.c b/fs/aio.c index 52d8b4dd96b7..9e40452e2a48 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -484,6 +484,11 @@ static int aio_ring_mmap(struct file *file, struct vm_area_struct *vma) { vma->vm_flags |= VM_DONTEXPAND; vma->vm_ops = &aio_ring_vm_ops; +#ifdef CONFIG_CHERI_PURECAP_UABI + vma->vm_flags |= VM_READ_CAPS | VM_WRITE_CAPS; + vma_set_page_prot(vma); +#endif + return 0; }