Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: block: recompute nr_integrity_segments in blk_insert_cloned_request blk_insert_cloned_request() already recomputes nr_phys_segments against the bottom queue, because "the queue settings related to segment counting may differ from the original queue." The exact same reasoning applies to integrity segments: a stacked driver's underlying queue can have tighter virt_boundary_mask, seg_boundary_mask, or max_segment_size than the top queue, in which case blk_rq_count_integrity_sg() against the bottom queue produces a different count than the cached rq->nr_integrity_segments inherited from the source request by blk_rq_prep_clone(). When the cached count is lower than the bottom queue's actual count, blk_rq_map_integrity_sg() trips BUG_ON(segments > rq->nr_integrity_segments); on dispatch. The same families of stacked setups that motivated the existing nr_phys_segments recompute -- dm-multipath fanning out to nvme-rdma in particular -- can produce this. Mirror the nr_phys_segments handling: when the request carries integrity, recompute nr_integrity_segments against the bottom queue and reject the request if it exceeds the bottom queue's max_integrity_segments. blk_rq_count_integrity_sg() and queue_max_integrity_segments() are both already available via <linux/blk-integrity.h>, which blk-mq.c includes. This closes a latent gap in the stacking contract and brings the integrity-segment accounting in line with the existing phys-segment accounting.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 76c313f658d2752e8527610677164aa7094ef7a5 before 53a01bcc0242590eda4c452a5bd996f62457113b; affected 76c313f658d2752e8527610677164aa7094ef7a5 before 0943f81e1b3176f27dbaf6db268fc69d8a94f0ba; affected 76c313f658d2752e8527610677164aa7094ef7a5 before 42929c98d044f126508baf54a65b0f87f932fa75; affected 76c313f658d2752e8527610677164aa7094ef7a5 before 2c6e6a18a37b905cb584eb0dda3ae482162a81ca |
| Linux / Linux | affected 6.12; unaffected 0 before 6.12; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/53a01bcc0242590eda4c452a5bd996f62457113b
- https://git.kernel.org/stable/c/0943f81e1b3176f27dbaf6db268fc69d8a94f0ba
- https://git.kernel.org/stable/c/42929c98d044f126508baf54a65b0f87f932fa75
- https://git.kernel.org/stable/c/2c6e6a18a37b905cb584eb0dda3ae482162a81ca
ADP enrichment
No English description supplied.
No references supplied.