From: Alex Deucher alexander.deucher@amd.com
mainline inclusion from mainline-v6.9 commit be4a2a81b6b90d1a47eaeaace4cc8e2cb57b96c7 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAEF52 CVE: CVE-2024-41011
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
We don't get the right offset in that case. The GPU has an unused 4K area of the register BAR space into which you can remap registers. We remap the HDP flush registers into this space to allow userspace (CPU or GPU) to flush the HDP when it updates VRAM. However, on systems with >4K pages, we end up exposing PAGE_SIZE of MMIO space.
Fixes: d8e408a82704 ("drm/amdkfd: Expose HDP registers to user space") Reviewed-by: Felix Kuehling felix.kuehling@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Conflicts: drivers/gpu/drm/amd/amdkfd/kfd_chardev.c [Commit 73fa13b6a511 ("drm/amdkfd: CRIU Implement KFD restore ioctl") is not merged] Signed-off-by: Zhang Changzhong zhangchangzhong@huawei.com --- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c index 2a99edf..4155010 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -1304,7 +1304,7 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep, goto err_unlock; } offset = amdgpu_amdkfd_get_mmio_remap_phys_addr(dev->kgd); - if (!offset) { + if (!offset || (PAGE_SIZE > 4096)) { err = -ENOMEM; goto err_unlock; } @@ -1962,6 +1962,9 @@ static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process, if (vma->vm_end - vma->vm_start != PAGE_SIZE) return -EINVAL;
+ if (PAGE_SIZE > 4096) + return -EINVAL; + address = amdgpu_amdkfd_get_mmio_remap_phys_addr(dev->kgd);
vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |