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block: fix sanity checks in blk_rq_map_user_bvec

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blk_rq_map_user_bvec contains a check bytes + bv->bv_len > nr_iter which
causes unnecessary failures in NVMe passthrough I/O, reproducible as
follows:

- register a 2 page, page-aligned buffer against a ring
- use that buffer to do a 1 page io_uring NVMe passthrough read

The second (i = 1) iteration of the loop in blk_rq_map_user_bvec will
then have nr_iter == 1 page, bytes == 1 page, bv->bv_len == 1 page, so
the check bytes + bv->bv_len > nr_iter will succeed, causing the I/O to
fail. This failure is unnecessary, as when the check succeeds, it means
we've checked the entire buffer that will be used by the request - i.e.
blk_rq_map_user_bvec should complete successfully. Therefore, terminate
the loop early and return successfully when the check bytes + bv->bv_len
> nr_iter succeeds.

While we're at it, also remove the check that all segments in the bvec
are single-page. While this seems to be true for all users of the
function, it doesn't appear to be required anywhere downstream.

CC: stable@vger.kernel.org
Signed-off-by: Xinyu Zhang <xizhang@purestorage.com>
Co-developed-by: Uday Shankar <ushankar@purestorage.com>
Signed-off-by: Uday Shankar <ushankar@purestorage.com>
Fixes: 3798754793 ("block: extend functionality to map bvec iterator")
Link: https://lore.kernel.org/r/20241023211519.4177873-1-ushankar@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Xinyu Zhang 2024-10-23 15:15:19 -06:00 committed by Jens Axboe
parent 49c234b50a
commit 2ff9494418
1 changed files with 1 additions and 3 deletions
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4
block/blk-map.c
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@ -600,9 +600,7 @@ static int blk_rq_map_user_bvec(struct request *rq, const struct iov_iter *iter)
if (nsegs >= nr_segs || bytes > UINT_MAX - bv->bv_len) if (nsegs >= nr_segs || bytes > UINT_MAX - bv->bv_len)
goto put_bio; goto put_bio;
if (bytes + bv->bv_len > nr_iter) if (bytes + bv->bv_len > nr_iter)
goto put_bio; break;
if (bv->bv_offset + bv->bv_len > PAGE_SIZE)
goto put_bio;
nsegs++; nsegs++;
bytes += bv->bv_len; bytes += bv->bv_len;