Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: md: suspend array while updating raid_disks via sysfs In raid1_reshape(), freeze_array() is called before modifying the r1bio memory pool (conf->r1bio_pool) and conf->raid_disks, and unfreeze_array() is called after the update is completed. However, freeze_array() only waits until nr_sync_pending and (nr_pending - nr_queued) of all buckets reaches zero. When an I/O error occurs, nr_queued is increased and the corresponding r1bio is queued to either retry_list or bio_end_io_list. As a result, freeze_array() may unblock before these r1bios are released. This can lead to a situation where conf->raid_disks and the mempool have already been updated while queued r1bios, allocated with the old raid_disks value, are later released. Consequently, free_r1bio() may access memory out of bounds in put_all_bios() and release r1bios of the wrong size to the new mempool, potentially causing issues with the mempool as well. Since only normal I/O might increase nr_queued while an I/O error occurs, suspending the array avoids this issue. Note: Updating raid_disks via ioctl SET_ARRAY_INFO already suspends the array. Therefore, we suspend the array when updating raid_disks via sysfs to avoid this issue too.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e2d59925221cd562e07fee38ec8839f7209ae603 before 863b9b7be824a6b2c0587532d3ece3022c6dd451; affected e2d59925221cd562e07fee38ec8839f7209ae603 before 165d1359f945b72c5f90088f60d48ff46115269e; affected e2d59925221cd562e07fee38ec8839f7209ae603 before 0107b18cd8ac17eb3e54786adc05a85cdbb6ef22; affected e2d59925221cd562e07fee38ec8839f7209ae603 before 2cc583653bbe050bacd1cadcc9776d39bf449740; affected 1b9203bb4c658c0242afa6fdb025c71d2fc3ad76; affected 8ccf6cfb157419847f3cb2bfdfbcdbd39860e8e9; affected 3.4.59 before 3.5; affected 3.9.7 before 3.10 |
| Linux / Linux | affected 3.10; unaffected 0 before 3.10; unaffected 6.6.160 through 6.6.*; unaffected 6.12.70 through 6.12.*; unaffected 6.18.10 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/863b9b7be824a6b2c0587532d3ece3022c6dd451
- https://git.kernel.org/stable/c/165d1359f945b72c5f90088f60d48ff46115269e
- https://git.kernel.org/stable/c/0107b18cd8ac17eb3e54786adc05a85cdbb6ef22
- https://git.kernel.org/stable/c/2cc583653bbe050bacd1cadcc9776d39bf449740
ADP enrichment
No English description supplied.
No references supplied.