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scsi: tcmu: do not set max_blocks if data_bitmap has been setup
This patch prevents a bug where data_bitmap is allocated in tcmu_configure_device, userspace changes the max_blocks setting, the device is mapped to a LUN, then we try to access the data_bitmap based on the new max_blocks limit which may now be out of range. To prevent this, we just check if data_bitmap has been setup. If it has then we fail the max_blocks update operation. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
parent
dc335a9955
commit
c97840c84f
1 changed files with 40 additions and 33 deletions
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@ -1811,9 +1811,11 @@ static int tcmu_configure_device(struct se_device *dev)
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info = &udev->uio_info;
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mutex_lock(&udev->cmdr_lock);
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udev->data_bitmap = kcalloc(BITS_TO_LONGS(udev->max_blocks),
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sizeof(unsigned long),
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GFP_KERNEL);
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mutex_unlock(&udev->cmdr_lock);
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if (!udev->data_bitmap) {
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ret = -ENOMEM;
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goto err_bitmap_alloc;
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@ -2018,7 +2020,7 @@ static match_table_t tokens = {
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{Opt_hw_block_size, "hw_block_size=%u"},
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{Opt_hw_max_sectors, "hw_max_sectors=%u"},
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{Opt_nl_reply_supported, "nl_reply_supported=%d"},
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{Opt_max_data_area_mb, "max_data_area_mb=%u"},
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{Opt_max_data_area_mb, "max_data_area_mb=%d"},
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{Opt_err, NULL}
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};
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@ -2046,13 +2048,48 @@ static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib)
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return 0;
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}
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static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg)
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{
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int val, ret;
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ret = match_int(arg, &val);
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if (ret < 0) {
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pr_err("match_int() failed for max_data_area_mb=. Error %d.\n",
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ret);
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return ret;
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}
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if (val <= 0) {
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pr_err("Invalid max_data_area %d.\n", val);
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return -EINVAL;
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}
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mutex_lock(&udev->cmdr_lock);
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if (udev->data_bitmap) {
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pr_err("Cannot set max_data_area_mb after it has been enabled.\n");
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ret = -EINVAL;
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goto unlock;
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}
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udev->max_blocks = TCMU_MBS_TO_BLOCKS(val);
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if (udev->max_blocks > tcmu_global_max_blocks) {
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pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n",
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val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks));
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udev->max_blocks = tcmu_global_max_blocks;
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}
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unlock:
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mutex_unlock(&udev->cmdr_lock);
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return ret;
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}
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static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
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const char *page, ssize_t count)
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{
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struct tcmu_dev *udev = TCMU_DEV(dev);
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char *orig, *ptr, *opts, *arg_p;
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substring_t args[MAX_OPT_ARGS];
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int ret = 0, token, tmpval;
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int ret = 0, token;
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opts = kstrdup(page, GFP_KERNEL);
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if (!opts)
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@ -2105,37 +2142,7 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
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pr_err("kstrtoint() failed for nl_reply_supported=\n");
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break;
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case Opt_max_data_area_mb:
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if (dev->export_count) {
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pr_err("Unable to set max_data_area_mb while exports exist\n");
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ret = -EINVAL;
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break;
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}
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arg_p = match_strdup(&args[0]);
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if (!arg_p) {
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ret = -ENOMEM;
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break;
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}
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ret = kstrtoint(arg_p, 0, &tmpval);
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kfree(arg_p);
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if (ret < 0) {
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pr_err("kstrtoint() failed for max_data_area_mb=\n");
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break;
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}
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if (tmpval <= 0) {
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pr_err("Invalid max_data_area %d\n", tmpval);
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ret = -EINVAL;
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break;
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}
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udev->max_blocks = TCMU_MBS_TO_BLOCKS(tmpval);
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if (udev->max_blocks > tcmu_global_max_blocks) {
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pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n",
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tmpval,
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TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks));
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udev->max_blocks = tcmu_global_max_blocks;
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}
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ret = tcmu_set_max_blocks_param(udev, &args[0]);
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break;
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default:
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break;
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