CVE-2022-48855

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> sctp: fix kernel-infoleak for SCTP sockets<br /> <br /> syzbot reported a kernel infoleak [1] of 4 bytes.<br /> <br /> After analysis, it turned out r-&gt;idiag_expires is not initialized<br /> if inet_sctp_diag_fill() calls inet_diag_msg_common_fill()<br /> <br /> Make sure to clear idiag_timer/idiag_retrans/idiag_expires<br /> and let inet_diag_msg_sctpasoc_fill() fill them again if needed.<br /> <br /> [1]<br /> <br /> BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline]<br /> BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:154 [inline]<br /> BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668<br /> instrument_copy_to_user include/linux/instrumented.h:121 [inline]<br /> copyout lib/iov_iter.c:154 [inline]<br /> _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668<br /> copy_to_iter include/linux/uio.h:162 [inline]<br /> simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519<br /> __skb_datagram_iter+0x2d5/0x11b0 net/core/datagram.c:425<br /> skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533<br /> skb_copy_datagram_msg include/linux/skbuff.h:3696 [inline]<br /> netlink_recvmsg+0x669/0x1c80 net/netlink/af_netlink.c:1977<br /> sock_recvmsg_nosec net/socket.c:948 [inline]<br /> sock_recvmsg net/socket.c:966 [inline]<br /> __sys_recvfrom+0x795/0xa10 net/socket.c:2097<br /> __do_sys_recvfrom net/socket.c:2115 [inline]<br /> __se_sys_recvfrom net/socket.c:2111 [inline]<br /> __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2111<br /> do_syscall_x64 arch/x86/entry/common.c:51 [inline]<br /> do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82<br /> entry_SYSCALL_64_after_hwframe+0x44/0xae<br /> <br /> Uninit was created at:<br /> slab_post_alloc_hook mm/slab.h:737 [inline]<br /> slab_alloc_node mm/slub.c:3247 [inline]<br /> __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4975<br /> kmalloc_reserve net/core/skbuff.c:354 [inline]<br /> __alloc_skb+0x545/0xf90 net/core/skbuff.c:426<br /> alloc_skb include/linux/skbuff.h:1158 [inline]<br /> netlink_dump+0x3e5/0x16c0 net/netlink/af_netlink.c:2248<br /> __netlink_dump_start+0xcf8/0xe90 net/netlink/af_netlink.c:2373<br /> netlink_dump_start include/linux/netlink.h:254 [inline]<br /> inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1341<br /> sock_diag_rcv_msg+0x24a/0x620<br /> netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2494<br /> sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:277<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]<br /> netlink_unicast+0x1093/0x1360 net/netlink/af_netlink.c:1343<br /> netlink_sendmsg+0x14d9/0x1720 net/netlink/af_netlink.c:1919<br /> sock_sendmsg_nosec net/socket.c:705 [inline]<br /> sock_sendmsg net/socket.c:725 [inline]<br /> sock_write_iter+0x594/0x690 net/socket.c:1061<br /> do_iter_readv_writev+0xa7f/0xc70<br /> do_iter_write+0x52c/0x1500 fs/read_write.c:851<br /> vfs_writev fs/read_write.c:924 [inline]<br /> do_writev+0x645/0xe00 fs/read_write.c:967<br /> __do_sys_writev fs/read_write.c:1040 [inline]<br /> __se_sys_writev fs/read_write.c:1037 [inline]<br /> __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037<br /> do_syscall_x64 arch/x86/entry/common.c:51 [inline]<br /> do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82<br /> entry_SYSCALL_64_after_hwframe+0x44/0xae<br /> <br /> Bytes 68-71 of 2508 are uninitialized<br /> Memory access of size 2508 starts at ffff888114f9b000<br /> Data copied to user address 00007f7fe09ff2e0<br /> <br /> CPU: 1 PID: 3478 Comm: syz-executor306 Not tainted 5.17.0-rc4-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011