From 2f03f21fe7516902283b135de272d3c7b10672de Mon Sep 17 00:00:00 2001 From: Raghavendra Rao Ananta Date: Fri, 31 Oct 2025 17:06:02 +0000 Subject: [PATCH] vfio: Fix ksize arg while copying user struct in vfio_df_ioctl_bind_iommufd() For the cases where user includes a non-zero value in 'token_uuid_ptr' field of 'struct vfio_device_bind_iommufd', the copy_struct_from_user() in vfio_df_ioctl_bind_iommufd() fails with -E2BIG. For the 'minsz' passed, copy_struct_from_user() expects the newly introduced field to be zero-ed, which would be incorrect in this case. Fix this by passing the actual size of the kernel struct. If working with a newer userspace, copy_struct_from_user() would copy the 'token_uuid_ptr' field, and if working with an old userspace, it would zero out this field, thus still retaining backward compatibility. Fixes: 86624ba3b522 ("vfio/pci: Do vf_token checks for VFIO_DEVICE_BIND_IOMMUFD") Cc: stable@vger.kernel.org Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20251031170603.2260022-2-rananta@google.com Signed-off-by: Alex Williamson --- drivers/vfio/device_cdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vfio/device_cdev.c b/drivers/vfio/device_cdev.c index 480cac3a0c274..8ceca24ac136c 100644 --- a/drivers/vfio/device_cdev.c +++ b/drivers/vfio/device_cdev.c @@ -99,7 +99,7 @@ long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df, return ret; if (user_size < minsz) return -EINVAL; - ret = copy_struct_from_user(&bind, minsz, arg, user_size); + ret = copy_struct_from_user(&bind, sizeof(bind), arg, user_size); if (ret) return ret; -- 2.47.3