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nvme: fix metadata handling in nvme-passthrough

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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>
This commit is contained in:
Puranjay Mohan 2024-08-29 13:32:17 +00:00 committed by Keith Busch
parent cead0b8991
commit 7c2fd76048
1 changed files with 14 additions and 8 deletions
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22
drivers/nvme/host/ioctl.c
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@ -4,6 +4,7 @@
* Copyright (c) 2017-2021 Christoph Hellwig.
*/
#include <linux/bio-integrity.h>
#include <linux/blk-integrity.h>
#include <linux/ptrace.h> /* for force_successful_syscall_return */
#include <linux/nvme_ioctl.h>
#include <linux/io_uring/cmd.h>
@ -119,9 +120,14 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
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;
int ret;
if (has_metadata && !supports_metadata)
return -EINVAL;
if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
struct iov_iter iter;
@ -143,15 +149,15 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
goto out;
bio = req->bio;
if (bdev) {
if (bdev)
bio_set_dev(bio, bdev);
if (meta_buffer && meta_len) {
ret = bio_integrity_map_user(bio, meta_buffer, meta_len,
meta_seed);
if (ret)
goto out_unmap;
req->cmd_flags |= REQ_INTEGRITY;
}
if (has_metadata) {
ret = bio_integrity_map_user(bio, meta_buffer, meta_len,
meta_seed);
if (ret)
goto out_unmap;
req->cmd_flags |= REQ_INTEGRITY;
}
return ret;