6.11-stable review patch. If anyone has any objections, please let me know.
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From: Puranjay Mohan pjy@amazon.com
[ Upstream commit 7c2fd76048e95dd267055b5f5e0a48e6e7c81fd9 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/ioctl.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c index f1d58e70933f5..15c93ce07e263 100644 --- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -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;