Vulnerabilidad en kernel de Linux (CVE-2024-36907)

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: SUNRPC: agrega un rpc_stat faltante para TCP TLS. El commit 1548036ef120 ("nfs: crea rpc_stat por espacio de nombres de red") agregó funcionalidad para especificar la función rpc_stats pero no la agregó a la funcionalidad TCP TLS. . Como resultado, montar con xprtsec=tls conduce a los siguientes errores del kernel. [128.984192] No se puede manejar la desreferencia del puntero NULL del kernel en la dirección virtual 000000000000001c [128.985058] Información de cancelación de memoria: [128.985372] ESR = 0x0000000096000004 [128.985709] EC = 0x25: (EL actual), IL = 32 bits [ 128.986176] SET = 0 , FnV = 0 [ 128.986521] EA = 0, S1PTW = 0 [ 128.986804] FSC = 0x04: error de traducción de nivel 0 [ 128.987229] Información de cancelación de datos: [ 128.987597] ISV = 0, ISS = 0x00000004, ISS2 = 0x000 00000 [ 128.988169] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 128.988811] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 128.989302] tabla de páginas de usuario: páginas de 4k, VA de 48 bits, pgdp=0000000106c84000 [ 128.990048] [000000000000001c] pgd=0000000000000000, p4d=0000000000000000 [ 128.990736] Error interno: Ups: 0000000096000004 [#1] SMP [ 168] Módulos vinculados en: nfs_layout_nfsv41_files rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd Grace netfs uinput dm_mod nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf _rechazar_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rfkill ip_set nf_tables nfnetlink qrtr vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock pc vfat fat uvcvideo videobuf2_vmalloc videobuf2_memops uvc videobuf2_v4l2 videodev videobuf2_common mc vmw_vmci xfs libcrc32c e1000e crct10dif_ce ghash_ce sha2_ce vmwgfx nvme sha256_arm64 nvme_core sr_mod cdrom sha1_ce _ttm_helper ttm drm_kms_helper drm sg fusible [ 128.996466 ] CPU: 0 PID: 179 Comm: kworker/u4:26 Kdump: cargado No contaminado 6.8.0-rc6+ #12 [ 128.997226] Nombre de hardware: VMware, Inc. VMware20,1/VBSA, BIOS VMW201.00V.21805430.BA64 .2305221830 22/05/2023 [ 128.998084] Cola de trabajo: xprtiod xs_tcp_tls_setup_socket [sunrpc] [ 128.998701] pstate: 81400005 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) [ 28.999384] ordenador: call_start+0x74/ 0x138 [sunrpc] [128.999809] lr: __rpc_execute+0xb8/0x3e0 [sunrpc] [129.000244] sp: ffff8000832b3a00 [129.000508] x29: ffff8000832b3a00 x28: 0081ac79c0 x27: ffff800081ac7000 [ 129.001111] x26: 0000000004248060 x25: 00000000000000000 x24: ffff800081596008 [ 129.001757] x23: ffff80007b087240 x22: ffff00009a509d30 x21: 0000000000000000 [ 129.002345] x20: ffff000090075600 x19: ffff00009a509d00 x18: [ 129.002912] x17: 733d4d4554535953 x16: 42555300312d746e x15: ffff8000832b3a88 [ 129.003464] x14: ffffffffffffffff x13: ffff8000832b3a7d x12: 0000000000000008 [129.004021] x11: 0101010101010101 x10: ffff8000150cb560 x9: ffff80007b087c00 [129.004577] x8: ffff00009a509de0 x7: 0000000000000000 x6: 00000000be8c4ee3 [ 129.005026] x5: 0000000000000000 x4: 0000000000000000 x3: ffff000094d56680 [129.005425] x2: ffff80007b0637f8 x1: ffff000090075600 x0: 00009a509d00 [ 129.005824] Rastreo de llamadas: [ 129.005967] call_start+0x74/0x138 [sunrpc] [ 129.006233] __rpc_execute+0xb8/0x3e0 [sunrpc] [ 129.006506] rpc_execute+0x160/0x1d8 [sunrpc] [ 129.006778] run_task+0x148/0x1f8 [sunrpc] [ 129.007204] tls_probe+0x80/ 0xd0 [sunrpc] [ 129.007460] rpc_ping+0x28/0x80 [sunrpc] [ 129.007715] rpc_create_xprt+0x134/0x1a0 [sunrpc] [ 129.007999] rpc_create+0x128/0x2a0 [ 129.008264] xs_tcp_tls_setup_socket+0xdc/0x508 [sunrpc] [ 129.008583 ] Process_one_work+0x174/0x3c8 [ 129.008813] work_thread+0x2c8/0x3e0 [ 129.009033] kthread+0x100/0x110 [ 129.009225] ret_from_fork+0x10/0x20 [ 129.009432] Código: ffffc2 911fe042 aa1403e1 aa1303e0 (b9401c83)