On Mon, Jul 16, 2018 at 07:09:10PM -0700, Todd Poynor wrote:
> --- a/drivers/staging/gasket/apex_driver.c
> +++ b/drivers/staging/gasket/apex_driver.c
> @@ -630,13 +630,10 @@ static bool is_gcb_in_reset(struct gasket_dev
> *gasket_dev)
> static uint apex_ioctl_check_permissions(struct file *filp, uint cmd)
This function name is a bit of out of date.
> {
> struct gasket_dev *gasket_dev = filp->private_data;
> - int root = capable(CAP_SYS_ADMIN);
> - int is_owner = gasket_dev->dev_info.ownership.is_owned &&
> - current->tgid == gasket_dev->dev_info.ownership.owner;
> + fmode_t write;
>
> - if (root || is_owner)
> - return 1;
> - return 0;
> + write = filp->f_mode & FMODE_WRITE;
> + return write;
This doesn't match the comment because it returns 0x2 or zero.
return !!(filp->f_mode & FMODE_WRITE);
> }
>
> /*
> diff --git a/drivers/staging/gasket/gasket_core.c
> b/drivers/staging/gasket/gasket_core.c
> index ae20b7ff9569b..9d1bb3caf6de2 100644
> --- a/drivers/staging/gasket/gasket_core.c
> +++ b/drivers/staging/gasket/gasket_core.c
> @@ -1085,6 +1085,7 @@ static int gasket_open(struct inode *inode, struct file
> *filp)
> char task_name[TASK_COMM_LEN];
> struct gasket_cdev_info *dev_info =
> container_of(inode->i_cdev, struct gasket_cdev_info, cdev);
> + int is_root = capable(CAP_SYS_ADMIN);
>
> gasket_dev = dev_info->gasket_dev_ptr;
> driver_desc = gasket_dev->internal_desc->driver_desc;
> @@ -1098,7 +1099,7 @@ static int gasket_open(struct inode *inode, struct file
> *filp)
> "Attempting to open with tgid %u (%s) (f_mode: 0%03o, "
> "fmode_write: %d is_root: %u)",
> current->tgid, task_name, filp->f_mode,
> - (filp->f_mode & FMODE_WRITE), capable(CAP_SYS_ADMIN));
> + (filp->f_mode & FMODE_WRITE), is_root);
>
> /* Always allow non-writing accesses. */
> if (!(filp->f_mode & FMODE_WRITE)) {
> @@ -1112,8 +1113,9 @@ static int gasket_open(struct inode *inode, struct file
> *filp)
> gasket_dev, "Current owner open count (owning tgid %u): %d.",
> ownership->owner, ownership->write_open_count);
>
> - /* Opening a node owned by another TGID is an error (even root.) */
> - if (ownership->is_owned && ownership->owner != current->tgid) {
> + /* Opening a node owned by another TGID is an error (unless root) */
> + if (ownership->is_owned && ownership->owner != current->tgid &&
> + !is_root) {
> gasket_log_error(
> gasket_dev,
> "Process %u is opening a node held by %u.",
> diff --git a/drivers/staging/gasket/gasket_ioctl.c
> b/drivers/staging/gasket/gasket_ioctl.c
> index 0c2f85cf54480..17431d14e6ef1 100644
> --- a/drivers/staging/gasket/gasket_ioctl.c
> +++ b/drivers/staging/gasket/gasket_ioctl.c
> @@ -171,7 +171,7 @@ long gasket_is_supported_ioctl(uint cmd)
> */
> static uint gasket_ioctl_check_permissions(struct file *filp, uint cmd)
> {
> - uint alive, root, device_owner;
> + uint alive;
> fmode_t read, write;
> struct gasket_dev *gasket_dev = (struct gasket_dev *)filp->private_data;
>
> @@ -183,33 +183,30 @@ static uint gasket_ioctl_check_permissions(struct file
> *filp, uint cmd)
> alive, gasket_dev->status);
> }
>
> - root = capable(CAP_SYS_ADMIN);
> read = filp->f_mode & FMODE_READ;
> write = filp->f_mode & FMODE_WRITE;
write = !!(filp->f_mode & FMODE_WRITE);
> - device_owner = (gasket_dev->dev_info.ownership.is_owned &&
> - current->tgid == gasket_dev->dev_info.ownership.owner);
>
> switch (cmd) {
> case GASKET_IOCTL_RESET:
> case GASKET_IOCTL_CLEAR_INTERRUPT_COUNTS:
> - return root || (write && device_owner);
> + return write;
regards,
dan carpenter
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