Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject out-of-range evcn in mi_enum_attr() In mi_enum_attr(), the start/end VCN validation for non-resident attributes is: if (svcn > evcn + 1) goto out; When evcn is U64_MAX the "evcn + 1" expression wraps to 0 and any svcn passes the check. For evcn values close to U64_MAX (but not equal to it) the right-hand side is still a meaningless near-wrap upper bound, so a malformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass mi_enum_attr() unrejected. VCN (virtual cluster number) is a cluster index, so any valid evcn is bounded by the volume's total cluster count, which ntfs3 holds in sbi->used.bitmap.nbits (set up in ntfs_init_from_boot() before any caller of mi_enum_attr() runs). Reject evcn values that fall outside this range. However, an empty non-resident attribute (no allocated clusters) is legitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via attr->nres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel must keep passing, so exclude evcn == U64_MAX from the range check. The existing "svcn > evcn + 1" test still tolerates the sentinel ("0 > 0" is false) and continues to require svcn == 0 for it, while the range check rejects every other out-of-range evcn and thereby also defuses the "evcn + 1" wraparound. svcn does not need its own bound: once evcn < nbits, "svcn > evcn + 1" implies svcn <= nbits. [almaz.alexandrovich@paragon-software.com: fixed evcn check]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 before 0441e34ce098c19185a7b52c5b8b89a8a5b26888; affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 before 7ab69cef49ebdfee288287d62641b24ab1445ecc; affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 before ce9a619c432b9a4044fee115c5483fbed946c131; affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 before 2b9a0e57bfd365e2096706b19ae34dce3b4a884b; affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 before 20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3; affected a7accf181a4709a6e380360372150cc4a1b6b89a; affected 3dfd727873c3e8da74a2e3907120ff052c5f0bcc; affected 1d7dd485108d4f633b543c9c14071cc325b68ae5; affected 5.15.209 before 5.16; affected 6.1.115 before 6.2; affected 6.5.11 before 6.6 |
| Linux / Linux | affected 6.6; unaffected 0 before 6.6; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888
- https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc
- https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131
- https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b
- https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3