| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-49875: nfsd: map the EBADMSG to nfserr_io to avoid warning |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nfsd: map the EBADMSG to nfserr_io to avoid warning |
| |
| Ext4 will throw -EBADMSG through ext4_readdir when a checksum error |
| occurs, resulting in the following WARNING. |
| |
| Fix it by mapping EBADMSG to nfserr_io. |
| |
| nfsd_buffered_readdir |
| iterate_dir // -EBADMSG -74 |
| ext4_readdir // .iterate_shared |
| ext4_dx_readdir |
| ext4_htree_fill_tree |
| htree_dirblock_to_tree |
| ext4_read_dirblock |
| __ext4_read_dirblock |
| ext4_dirblock_csum_verify |
| warn_no_space_for_csum |
| __warn_no_space_for_csum |
| return ERR_PTR(-EFSBADCRC) // -EBADMSG -74 |
| nfserrno // WARNING |
| |
| [ 161.115610] ------------[ cut here ]------------ |
| [ 161.116465] nfsd: non-standard errno: -74 |
| [ 161.117315] WARNING: CPU: 1 PID: 780 at fs/nfsd/nfsproc.c:878 nfserrno+0x9d/0xd0 |
| [ 161.118596] Modules linked in: |
| [ 161.119243] CPU: 1 PID: 780 Comm: nfsd Not tainted 5.10.0-00014-g79679361fd5d #138 |
| [ 161.120684] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qe |
| mu.org 04/01/2014 |
| [ 161.123601] RIP: 0010:nfserrno+0x9d/0xd0 |
| [ 161.124676] Code: 0f 87 da 30 dd 00 83 e3 01 b8 00 00 00 05 75 d7 44 89 ee 48 c7 c7 c0 57 24 98 89 44 24 04 c6 |
| 05 ce 2b 61 03 01 e8 99 20 d8 00 <0f> 0b 8b 44 24 04 eb b5 4c 89 e6 48 c7 c7 a0 6d a4 99 e8 cc 15 33 |
| [ 161.127797] RSP: 0018:ffffc90000e2f9c0 EFLAGS: 00010286 |
| [ 161.128794] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 |
| [ 161.130089] RDX: 1ffff1103ee16f6d RSI: 0000000000000008 RDI: fffff520001c5f2a |
| [ 161.131379] RBP: 0000000000000022 R08: 0000000000000001 R09: ffff8881f70c1827 |
| [ 161.132664] R10: ffffed103ee18304 R11: 0000000000000001 R12: 0000000000000021 |
| [ 161.133949] R13: 00000000ffffffb6 R14: ffff8881317c0000 R15: ffffc90000e2fbd8 |
| [ 161.135244] FS: 0000000000000000(0000) GS:ffff8881f7080000(0000) knlGS:0000000000000000 |
| [ 161.136695] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| [ 161.137761] CR2: 00007fcaad70b348 CR3: 0000000144256006 CR4: 0000000000770ee0 |
| [ 161.139041] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 |
| [ 161.140291] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 |
| [ 161.141519] PKRU: 55555554 |
| [ 161.142076] Call Trace: |
| [ 161.142575] ? __warn+0x9b/0x140 |
| [ 161.143229] ? nfserrno+0x9d/0xd0 |
| [ 161.143872] ? report_bug+0x125/0x150 |
| [ 161.144595] ? handle_bug+0x41/0x90 |
| [ 161.145284] ? exc_invalid_op+0x14/0x70 |
| [ 161.146009] ? asm_exc_invalid_op+0x12/0x20 |
| [ 161.146816] ? nfserrno+0x9d/0xd0 |
| [ 161.147487] nfsd_buffered_readdir+0x28b/0x2b0 |
| [ 161.148333] ? nfsd4_encode_dirent_fattr+0x380/0x380 |
| [ 161.149258] ? nfsd_buffered_filldir+0xf0/0xf0 |
| [ 161.150093] ? wait_for_concurrent_writes+0x170/0x170 |
| [ 161.151004] ? generic_file_llseek_size+0x48/0x160 |
| [ 161.151895] nfsd_readdir+0x132/0x190 |
| [ 161.152606] ? nfsd4_encode_dirent_fattr+0x380/0x380 |
| [ 161.153516] ? nfsd_unlink+0x380/0x380 |
| [ 161.154256] ? override_creds+0x45/0x60 |
| [ 161.155006] nfsd4_encode_readdir+0x21a/0x3d0 |
| [ 161.155850] ? nfsd4_encode_readlink+0x210/0x210 |
| [ 161.156731] ? write_bytes_to_xdr_buf+0x97/0xe0 |
| [ 161.157598] ? __write_bytes_to_xdr_buf+0xd0/0xd0 |
| [ 161.158494] ? lock_downgrade+0x90/0x90 |
| [ 161.159232] ? nfs4svc_decode_voidarg+0x10/0x10 |
| [ 161.160092] nfsd4_encode_operation+0x15a/0x440 |
| [ 161.160959] nfsd4_proc_compound+0x718/0xe90 |
| [ 161.161818] nfsd_dispatch+0x18e/0x2c0 |
| [ 161.162586] svc_process_common+0x786/0xc50 |
| [ 161.163403] ? nfsd_svc+0x380/0x380 |
| [ 161.164137] ? svc_printk+0x160/0x160 |
| [ 161.164846] ? svc_xprt_do_enqueue.part.0+0x365/0x380 |
| [ 161.165808] ? nfsd_svc+0x380/0x380 |
| [ 161.166523] ? rcu_is_watching+0x23/0x40 |
| [ 161.167309] svc_process+0x1a5/0x200 |
| [ 161.168019] nfsd+0x1f5/0x380 |
| [ 161.168663] ? nfsd_shutdown_threads+0x260/0x260 |
| [ 161.169554] kthread+0x1c4/0x210 |
| [ 161.170224] ? kthread_insert_work_sanity_check+0x80/0x80 |
| [ 161.171246] ret_from_fork+0x1f/0x30 |
| |
| The Linux kernel CVE team has assigned CVE-2024-49875 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.227 with commit 0ea4333c679f333e23956de743ad17387819d3f2 |
| Fixed in 5.15.168 with commit 825789ca94602543101045ad3aad19b2b60c6b2a |
| Fixed in 6.1.113 with commit 6fe058502f8864649c3d614b06b2235223798f48 |
| Fixed in 6.6.55 with commit f7d8ee9db94372b8235f5f22bb24381891594c42 |
| Fixed in 6.10.14 with commit c76005adfa93d1a027433331252422078750321f |
| Fixed in 6.11.3 with commit e9cfecca22a36b927a440abc6307efb9e138fed5 |
| Fixed in 6.12 with commit 340e61e44c1d2a15c42ec72ade9195ad525fd048 |
| |
| 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-2024-49875 |
| 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/nfsd/vfs.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/0ea4333c679f333e23956de743ad17387819d3f2 |
| https://git.kernel.org/stable/c/825789ca94602543101045ad3aad19b2b60c6b2a |
| https://git.kernel.org/stable/c/6fe058502f8864649c3d614b06b2235223798f48 |
| https://git.kernel.org/stable/c/f7d8ee9db94372b8235f5f22bb24381891594c42 |
| https://git.kernel.org/stable/c/c76005adfa93d1a027433331252422078750321f |
| https://git.kernel.org/stable/c/e9cfecca22a36b927a440abc6307efb9e138fed5 |
| https://git.kernel.org/stable/c/340e61e44c1d2a15c42ec72ade9195ad525fd048 |
