The io_uring shared memory region hosts the io_uring_sqe and io_uring_cqe arrays. These structs may contain user pointers, so the memory region must be allowed to store and load capability pointers.
Signed-off-by: Tudor Cretu tudor.cretu@arm.com --- io_uring/io_uring.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index a355f2a2e7ac3..a98f0013e47c1 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3138,6 +3138,11 @@ static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) if (IS_ERR(ptr)) return PTR_ERR(ptr);
+#ifdef CONFIG_CHERI_PURECAP_UABI + vma->vm_flags |= VM_READ_CAPS | VM_WRITE_CAPS; + vma_set_page_prot(vma); +#endif + pfn = virt_to_phys(ptr) >> PAGE_SHIFT; return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); }