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block: integrity: Do not call set_page_dirty_lock()

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commit 39e160505198ff8c158f11bce2ba19809a756e8b upstream.

Placing multiple protection information buffers inside the same page
can lead to oopses because set_page_dirty_lock() can't be called from
interrupt context.

Since a protection information buffer is not backed by a file there is
no point in setting its page dirty, there is nothing to synchronize.
Drop the call to set_page_dirty_lock() and remove the last argument to
bio_integrity_unpin_bvec().

Cc: stable@vger.kernel.org
Fixes: 492c5d4559 ("block: bio-integrity: directly map user buffers")
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/yq1v7r3ev9g.fsf@ca-mkp.ca.oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin K. Petersen 2025-04-16 16:04:10 -04:00 committed by Greg Kroah-Hartman
parent db42e6f28b
commit c38a005e6e
1 changed files with 6 additions and 11 deletions
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17
block/bio-integrity.c
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@ -104,16 +104,12 @@ err:
}
EXPORT_SYMBOL(bio_integrity_alloc);
static void bio_integrity_unpin_bvec(struct bio_vec *bv, int nr_vecs,
bool dirty)
static void bio_integrity_unpin_bvec(struct bio_vec *bv, int nr_vecs)
{
int i;
for (i = 0; i < nr_vecs; i++) {
if (dirty && !PageCompound(bv[i].bv_page))
set_page_dirty_lock(bv[i].bv_page);
for (i = 0; i < nr_vecs; i++)
unpin_user_page(bv[i].bv_page);
}
}
static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip)
@ -129,7 +125,7 @@ static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip)
ret = copy_to_iter(bvec_virt(bounce_bvec), bytes, &orig_iter);
WARN_ON_ONCE(ret != bytes);
bio_integrity_unpin_bvec(orig_bvecs, orig_nr_vecs, true);
bio_integrity_unpin_bvec(orig_bvecs, orig_nr_vecs);
}
/**
@ -149,8 +145,7 @@ void bio_integrity_unmap_user(struct bio *bio)
return;
}
bio_integrity_unpin_bvec(bip->bip_vec, bip->bip_max_vcnt,
bio_data_dir(bio) == READ);
bio_integrity_unpin_bvec(bip->bip_vec, bip->bip_max_vcnt);
}
/**
@ -236,7 +231,7 @@ static int bio_integrity_copy_user(struct bio *bio, struct bio_vec *bvec,
}
if (write)
bio_integrity_unpin_bvec(bvec, nr_vecs, false);
bio_integrity_unpin_bvec(bvec, nr_vecs);
else
memcpy(&bip->bip_vec[1], bvec, nr_vecs * sizeof(*bvec));
@ -362,7 +357,7 @@ int bio_integrity_map_user(struct bio *bio, void __user *ubuf, ssize_t bytes,
return 0;
release_pages:
bio_integrity_unpin_bvec(bvec, nr_bvecs, false);
bio_integrity_unpin_bvec(bvec, nr_bvecs);
free_bvec:
if (bvec != stack_vec)
kfree(bvec);