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Message-ID: <2024111932-CVE-2024-53066-abf7@gregkh> Date: Tue, 19 Nov 2024 18:22:37 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-53066: nfs: Fix KMSAN warning in decode_getfattr_attrs() Description =========== In the Linux kernel, the following vulnerability has been resolved: nfs: Fix KMSAN warning in decode_getfattr_attrs() Fix the following KMSAN warning: CPU: 1 UID: 0 PID: 7651 Comm: cp Tainted: G B Tainted: [B]=BAD_PAGE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009) ===================================================== ===================================================== BUG: KMSAN: uninit-value in decode_getfattr_attrs+0x2d6d/0x2f90 decode_getfattr_attrs+0x2d6d/0x2f90 decode_getfattr_generic+0x806/0xb00 nfs4_xdr_dec_getattr+0x1de/0x240 rpcauth_unwrap_resp_decode+0xab/0x100 rpcauth_unwrap_resp+0x95/0xc0 call_decode+0x4ff/0xb50 __rpc_execute+0x57b/0x19d0 rpc_execute+0x368/0x5e0 rpc_run_task+0xcfe/0xee0 nfs4_proc_getattr+0x5b5/0x990 __nfs_revalidate_inode+0x477/0xd00 nfs_access_get_cached+0x1021/0x1cc0 nfs_do_access+0x9f/0xae0 nfs_permission+0x1e4/0x8c0 inode_permission+0x356/0x6c0 link_path_walk+0x958/0x1330 path_lookupat+0xce/0x6b0 filename_lookup+0x23e/0x770 vfs_statx+0xe7/0x970 vfs_fstatat+0x1f2/0x2c0 __se_sys_newfstatat+0x67/0x880 __x64_sys_newfstatat+0xbd/0x120 x64_sys_call+0x1826/0x3cf0 do_syscall_64+0xd0/0x1b0 entry_SYSCALL_64_after_hwframe+0x77/0x7f The KMSAN warning is triggered in decode_getfattr_attrs(), when calling decode_attr_mdsthreshold(). It appears that fattr->mdsthreshold is not initialized. Fix the issue by initializing fattr->mdsthreshold to NULL in nfs_fattr_init(). The Linux kernel CVE team has assigned CVE-2024-53066 to this issue. Affected and fixed versions =========================== Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 4.19.324 with commit 25ffd294fef8 Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 5.4.286 with commit bbfcd261cc06 Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 5.10.230 with commit 8fc5ea9231af Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 5.15.172 with commit 9b453e8b108a Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 6.1.117 with commit f6b2b2b981af Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 6.6.61 with commit f749cb60a01f Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 6.11.8 with commit 9be0a21ae52b Issue introduced in 3.5 with commit 88034c3d88c2 and fixed in 6.12 with commit dc270d715969 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-53066 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: fs/nfs/inode.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/25ffd294fef81a7f3cd9528adf21560c04d98747 https://git.kernel.org/stable/c/bbfcd261cc068fe1cd02a4e871275074a0daa4e2 https://git.kernel.org/stable/c/8fc5ea9231af9122d227c9c13f5e578fca48d2e3 https://git.kernel.org/stable/c/9b453e8b108a5a93a6e348cf2ba4c9c138314a00 https://git.kernel.org/stable/c/f6b2b2b981af8e7d7c62d34143acefa4e1edfe8b https://git.kernel.org/stable/c/f749cb60a01f8391c760a1d6ecd938cadacf9549 https://git.kernel.org/stable/c/9be0a21ae52b3b822d0eec4d14e909ab394f8a92 https://git.kernel.org/stable/c/dc270d7159699ad6d11decadfce9633f0f71c1db
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