Description
In the Linux kernel, the following vulnerability has been resolved: libceph: fix multiple unsafe decodes in decode_locker() decode_locker() in cls_lock_client.c contains three unsafe decode operations that allow a malicious or compromised OSD to trigger slab-out-of-bounds reads: 1. ceph_decode_copy() at the locker_id_t name field has no preceding bounds check. With p == end after ceph_start_decoding() accepts struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past the validated buffer boundary. 2. *p += sizeof(struct ceph_timespec) after the locker_info_t header is an unchecked pointer advance. A malicious OSD can position p past end, causing all subsequent _safe checks to pass against a bogus boundary. 3. len = ceph_decode_32(p) has no preceding bounds check, and the immediately following *p += len is uncapped. A malicious OSD can send len=0xffffffff, advancing p gigabytes past end and escaping the decode window entirely. Fix all three by replacing bare operations with their safe variants: ceph_decode_copy -> ceph_decode_copy_safe *p += sizeof(...) -> ceph_decode_skip_n ceph_decode_32(p) -> ceph_decode_32_safe *p += len -> ceph_decode_skip_n A new label is added to return -EINVAL on any bounds violation. -EINVAL is appropriate here: the data received from the OSD is structurally malformed, which is an invalid argument to the decode contract regardless of whether the caller or the wire is at fault. Attacker model: a malicious or compromised OSD in a multi-tenant Ceph deployment can trigger this against any kernel client that issues the lock.get_info class method (e.g. during RBD exclusive lock acquisition) without any further privileges beyond OSD session establishment. [ idryomov: use ceph_decode_skip_string() to skip description, trim changelog ]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d4ed4a530562881cc5225050e42d96034f405aae to < 1ed45c8d96498725eb54f740172f9068d8673906affectedd4ed4a530562881cc5225050e42d96034f405aae to < 6265103e78f0ee7e2518de9cf938b94bee9700a0affectedd4ed4a530562881cc5225050e42d96034f405aae to < 3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070affectedd4ed4a530562881cc5225050e42d96034f405aae to < fa4aa86fff0c56799c2e3f51a88879053285f4a9affectedd4ed4a530562881cc5225050e42d96034f405aae to < dbfd83f722a78446ec18a476ef7a38e52240b50aaffectedd4ed4a530562881cc5225050e42d96034f405aae to < d1bba38574d095f191557d397d9633f08cd966b1affectedd4ed4a530562881cc5225050e42d96034f405aae to < 51c8d238fe7236de627ab1a1433694552a904136affectedd4ed4a530562881cc5225050e42d96034f405aae to < 437b6551cfcc235eea1d735a874f9d421f555e17affected
Linux Linux
Default version status: affected
4.9affected0 to < 4.9unaffected5.10.266 to ≤ 5.10.*unaffected5.15.217 to ≤ 5.15.*unaffected6.1.184 to ≤ 6.1.*unaffected6.6.153 to ≤ 6.6.*unaffected6.12.105 to ≤ 6.12.*unaffected6.18.46 to ≤ 6.18.*unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906 ↗
- https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0 ↗
- https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070 ↗
- https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9 ↗
- https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a ↗
- https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1 ↗
- https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136 ↗
- https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17 ↗