6.1-stable review patch. If anyone has any objections, please let me know.
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From: Puranjay Mohan pjy@amazon.com
commit 7c2fd76048e95dd267055b5f5e0a48e6e7c81fd9 upstream.
On an NVMe namespace that does not support metadata, it is possible to send an IO command with metadata through io-passthru. This allows issues like [1] to trigger in the completion code path. nvme_map_user_request() doesn't check if the namespace supports metadata before sending it forward. It also allows admin commands with metadata to be processed as it ignores metadata when bdev == NULL and may report success.
Reject an IO command with metadata when the NVMe namespace doesn't support it and reject an admin command if it has metadata.
[1] https://lore.kernel.org/all/mb61pcylvnym8.fsf@amazon.com/
Suggested-by: Christoph Hellwig hch@lst.de Signed-off-by: Puranjay Mohan pjy@amazon.com Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Sagi Grimberg sagi@grimberg.me Reviewed-by: Anuj Gupta anuj20.g@samsung.com Signed-off-by: Keith Busch kbusch@kernel.org [ Minor changes to make it work on 6.1 ] Signed-off-by: Puranjay Mohan pjy@amazon.com Signed-off-by: Hagar Hemdan hagarhem@amazon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvme/host/ioctl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -3,6 +3,7 @@ * Copyright (c) 2011-2014, Intel Corporation. * Copyright (c) 2017-2021 Christoph Hellwig. */ +#include <linux/blk-integrity.h> #include <linux/ptrace.h> /* for force_successful_syscall_return */ #include <linux/nvme_ioctl.h> #include <linux/io_uring.h> @@ -95,10 +96,15 @@ static int nvme_map_user_request(struct struct request_queue *q = req->q; struct nvme_ns *ns = q->queuedata; struct block_device *bdev = ns ? ns->disk->part0 : NULL; + bool supports_metadata = bdev && blk_get_integrity(bdev->bd_disk); + bool has_metadata = meta_buffer && meta_len; struct bio *bio = NULL; void *meta = NULL; int ret;
+ if (has_metadata && !supports_metadata) + return -EINVAL; + if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) { struct iov_iter iter;
@@ -122,7 +128,7 @@ static int nvme_map_user_request(struct if (bdev) bio_set_dev(bio, bdev);
- if (bdev && meta_buffer && meta_len) { + if (has_metadata) { meta = nvme_add_user_metadata(req, meta_buffer, meta_len, meta_seed); if (IS_ERR(meta)) {