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linux/block
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Bryam Vargas 5eacdb1967 partitions: aix: bound the pp_count scan to the ppe array 
commit 2dc0bfd2fe upstream.

aix_partition() reads the physical volume descriptor into a fixed-size
struct pvd and then scans its physical-partition-extent array:

	int numpps = be16_to_cpu(pvd->pp_count);
	...
	for (i = 0; i < numpps; i += 1) {
		struct ppe *p = pvd->ppe + i;
		...
		lp_ix = be16_to_cpu(p->lp_ix);

pvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a
fixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the
on-disk pp_count.  pp_count is an unvalidated __be16 read straight from
the descriptor, so a crafted AIX image with pp_count larger than 1016
drives the loop to read pvd->ppe[i] past the end of the allocation (up
to 65535 entries, ~2 MB out of bounds).

The partition scan runs without mounting anything, when a block device
with a crafted AIX/IBM partition table appears (an attacker-supplied
image attached with losetup -P, or a device auto-scanned by udev), via
msdos_partition() -> aix_partition().

Clamp the scan to the number of entries the ppe[] array can hold.

Fixes: 6ceea22bbb ("partitions: add aix lvm partition support files")
Cc: stable@vger.kernel.org
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Acked-by: Philippe De Muyter <phdm@macqel.be>
Link: https://patch.msgid.link/20260607064137.302574-1-hexlabsecurity@proton.me
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-07-24 15:51:24 +02:00
..
partitions partitions: aix: bound the pp_count scan to the ppe array 2026-07-24 15:51:24 +02:00
badblocks.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
bdev.c block: Avoid mounting the bdev pseudo-filesystem in userspace 2026-07-24 15:51:17 +02:00
bfq-cgroup.c block,bfq: fix aux stat accumulation destination 2026-02-11 13:35:29 +01:00
bfq-iosched.c block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() 2025-01-23 17:15:55 +01:00
bfq-iosched.h bfq: Get rid of __bio_blkcg() usage 2022-06-09 10:23:19 +02:00
bfq-wf2q.c block/bfq_wf2q: correct weight to ioprio 2022-04-08 14:23:55 +02:00
bio-integrity.c block: initialize integrity buffer to zero before writing it to media 2024-08-19 05:44:50 +02:00
bio.c block: fix 'kmem_cache of name 'bio-108' already exists' 2025-04-10 14:31:51 +02:00
blk-cgroup-rwstat.c blk-cgroup: Fix the recursive blkg rwstat 2021-03-05 11:32:15 -07:00
blk-cgroup-rwstat.h blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
blk-cgroup.c blk-cgroup: Fix NULL deref caused by blkg_policy_data being installed before init 2026-06-19 13:33:49 +02:00
blk-core.c blk-core: use pr_warn_ratelimited() in bio_check_ro() 2023-11-20 11:08:29 +01:00
blk-crypto-fallback.c blk-crypto: fix missing blktrace bio split events 2025-10-29 14:03:07 +01:00
blk-crypto-internal.h blk-mq: release crypto keyslot before reporting I/O complete 2023-05-11 23:00:16 +09:00
blk-crypto.c blk-crypto: make blk_crypto_evict_key() more robust 2023-05-11 23:00:16 +09:00
blk-exec.c block: return errors from blk_execute_rq() 2021-06-30 15:35:45 -06:00
blk-flush.c block: Fix fsync always failed if once failed 2022-01-27 11:05:25 +01:00
blk-integrity.c blk-integrity: register sysfs attributes on struct device 2024-10-17 15:11:33 +02:00
blk-ioc.c block: fix default IO priority handling again 2022-08-11 13:07:50 +02:00
blk-iocost.c blk-iocost: do not WARN if iocg was already offlined 2025-05-02 07:44:22 +02:00
blk-iolatency.c block: don't allow the same type rq_qos add more than once 2022-08-17 14:24:24 +02:00
blk-ioprio.c block: Introduce the ioprio rq-qos policy 2021-06-21 15:03:40 -06:00
blk-ioprio.h block: Introduce the ioprio rq-qos policy 2021-06-21 15:03:40 -06:00
blk-lib.c block: export blk_next_bio() 2021-06-17 15:51:20 +02:00
blk-map.c block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern 2022-03-08 19:12:31 +01:00
blk-merge.c blk-mq: release crypto keyslot before reporting I/O complete 2023-05-11 23:00:16 +09:00
blk-mq-cpumap.c blk-mq: remove the calling of local_memory_node() 2020-10-20 07:08:17 -06:00
blk-mq-debugfs-zoned.c block: Cleanup license notice 2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs() 2026-03-04 07:19:59 -05:00
blk-mq-debugfs.h blk-mq: no need to check return value of debugfs_create functions 2019-06-13 03:00:30 -06:00
blk-mq-pci.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq-rdma.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq-sched.c blk-mq: correct stale comment of .get_budget 2023-03-10 09:39:04 +01:00
blk-mq-sched.h blk: Fix lock inversion between ioc lock and bfqd lock 2021-06-24 18:43:55 -06:00
blk-mq-sysfs.c blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx 2025-10-19 16:21:30 +02:00
blk-mq-tag.c blk-mq: avoid to iterate over stale request 2021-09-12 19:32:43 -06:00
blk-mq-tag.h blk-mq: Some tag allocation code refactoring 2021-05-24 06:47:22 -06:00
blk-mq-virtio.c blk-mq: Fix typo in comment 2020-03-17 20:55:21 +01:00
blk-mq.c blk-mq: use quiesced elevator switch when reinitializing queues 2026-06-01 17:35:09 +02:00
blk-mq.h block: fix ordering between checking BLK_MQ_S_STOPPED request adding 2024-12-14 19:51:17 +01:00
blk-pm.c scsi: block: pm: Always set request queue runtime active in blk_post_runtime_resume() 2022-01-27 11:04:15 +01:00
blk-pm.h block: Remove unused blk_pm_*() function definitions 2021-02-22 06:33:48 -07:00
blk-rq-qos.c blk-rq-qos: fix crash on rq_qos_wait vs. rq_qos_wake_function race 2024-10-22 15:40:43 +02:00
blk-rq-qos.h block: don't allow the same type rq_qos add more than once 2022-08-17 14:24:24 +02:00
blk-settings.c block: use int to store blk_stack_limits() return value 2025-10-19 16:21:30 +02:00
blk-stat.c block: prevent division by zero in blk_rq_stat_sum() 2024-04-13 13:01:45 +02:00
blk-stat.h block: deactivate blk_stat timer in wbt_disable_default() 2018-12-12 06:47:51 -07:00
blk-sysfs.c block: fix use-after-free of q->q_usage_counter 2023-10-10 21:59:05 +02:00
blk-throttle.c blk-throttle: Set BIO_THROTTLED when bio has been throttled 2026-01-19 13:10:18 +01:00
blk-timeout.c block: blk-timeout: delete duplicated word 2020-07-31 16:29:47 -06:00
blk-wbt.c blk-wbt: fix that 'rwb->wc' is always set to 1 in wbt_init() 2022-10-26 12:35:54 +02:00
blk-wbt.h blk-wbt: introduce a new disable state to prevent false positive by rwb_enabled() 2021-06-21 15:03:41 -06:00
blk-zoned.c block: Hold invalidate_lock in BLKRESETZONE ioctl 2021-11-18 19:17:15 +01:00
blk.h blk-mq: use quiesced elevator switch when reinitializing queues 2026-06-01 17:35:09 +02:00
bounce.c block: use memcpy_from_bvec in __blk_queue_bounce 2021-08-02 13:37:28 -06:00
bsg-lib.c scsi: bsg-lib: Fix commands without data transfer in bsg_transport_sg_io_fn() 2021-08-01 13:21:40 -04:00
bsg.c scsi: bsg: Fix device unregistration 2021-09-14 00:22:15 -04:00
disk-events.c block: increment diskseq on all media change events 2023-07-23 13:47:20 +02:00
elevator.c blk-mq: use quiesced elevator switch when reinitializing queues 2026-06-01 17:35:09 +02:00
fops.c block: fix direct io NOWAIT flag not work 2025-05-22 14:08:26 +02:00
genhd.c block: rate-limit capacity change info log 2026-01-19 13:09:49 +01:00
holder.c block: drop unused includes in <linux/genhd.h> 2022-03-16 14:23:46 +01:00
ioctl.c Revert "block: don't add or resize partition on the disk with GENHD_FL_NO_PART" 2025-12-07 06:09:33 +09:00
ioprio.c block: fix default IO priority handling again 2022-08-11 13:07:50 +02:00
Kconfig block: default BLOCK_LEGACY_AUTOLOAD to y 2025-06-27 11:05:34 +01:00
Kconfig.iosched Revert "block/mq-deadline: Add cgroup support" 2021-08-11 13:47:26 -06:00
keyslot-manager.c blk-crypto: make blk_crypto_evict_key() more robust 2023-05-11 23:00:16 +09:00
kyber-iosched.c kyber: avoid q->disk dereferences in trace points 2021-10-15 21:02:57 -06:00
Makefile block: move CONFIG_BLOCK guard to top Makefile 2022-12-14 11:37:30 +01:00
mq-deadline.c block: mq-deadline: Rename deadline_is_seq_writes() 2023-01-24 07:22:49 +01:00
opal_proto.h block: sed-opal: handle empty atoms when parsing response 2024-03-26 18:21:13 -04:00
sed-opal.c block: sed-opal: handle empty atoms when parsing response 2024-03-26 18:21:13 -04:00
t10-pi.c block: use bvec_kmap_local in t10_pi_type1_{prepare,complete} 2021-08-02 13:37:28 -06:00