riscv: Make VM_WRITE imply VM_READ

commit 7ab72c597356be1e7f0f3d856e54ce78527f43c8 upstream.

RISC-V does not presently have write-only mappings as that PTE bit pattern
is considered reserved in the privileged spec, so allow handling of read
faults in VMAs that have VM_WRITE without VM_READ in order to be consistent
with other architectures that have similar limitations.

Fixes: 2139619bcad7 ("riscv: mmap with PROT_WRITE but no PROT_READ is invalid")
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Bresticker <abrestic@rivosinc.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220915193702.2201018-2-abrestic@rivosinc.com/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index aa08dd2..7cfaf36 100644 (file)
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -188,7 +188,8 @@ static inline bool access_error(unsigned long cause, struct vm_area_struct *vma)
                }
                break;
        case EXC_LOAD_PAGE_FAULT:
-               if (!(vma->vm_flags & VM_READ)) {
+               /* Write implies read */
+               if (!(vma->vm_flags & (VM_READ | VM_WRITE))) {
                        return true;
                }
                break;