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Message-ID: <672bae42.050a0220.350062.0279.GAE@google.com> Date: Wed, 06 Nov 2024 09:58:26 -0800 From: syzbot <syzbot+0c85cae3350b7d486aee@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (4) syzbot has found a reproducer for the following issue on: HEAD commit: 2e1b3cc9d7f7 Merge tag 'arm-fixes-6.12-2' of git://git.ker.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1485dd5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=6fdf74cce377223b dashboard link: https://syzkaller.appspot.com/bug?extid=0c85cae3350b7d486aee compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1685dd5f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bfb6a7980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/08456e37db58/disk-2e1b3cc9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cc957f7ba80b/vmlinux-2e1b3cc9.xz kernel image: https://storage.googleapis.com/syzbot-assets/7579fe72ed89/bzImage-2e1b3cc9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0c85cae3350b7d486aee@...kaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:30 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:300 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:328 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x2f3/0x2b30 lib/iov_iter.c:185 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x2f3/0x2b30 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:211 [inline] simple_copy_to_iter net/core/datagram.c:524 [inline] __skb_datagram_iter+0x18d/0x1190 net/core/datagram.c:401 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:538 skb_copy_datagram_msg include/linux/skbuff.h:4076 [inline] netlink_recvmsg+0x432/0x1610 net/netlink/af_netlink.c:1958 sock_recvmsg_nosec net/socket.c:1051 [inline] sock_recvmsg+0x2c4/0x340 net/socket.c:1073 sock_read_iter+0x32d/0x3c0 net/socket.c:1143 io_iter_do_read io_uring/rw.c:771 [inline] __io_read+0x8d2/0x20f0 io_uring/rw.c:865 io_read+0x3e/0xf0 io_uring/rw.c:943 io_issue_sqe+0x429/0x22c0 io_uring/io_uring.c:1739 io_queue_sqe io_uring/io_uring.c:1953 [inline] io_req_task_submit+0x104/0x1e0 io_uring/io_uring.c:1373 io_poll_task_func+0x12e5/0x1620 io_handle_tw_list+0x23a/0x5c0 io_uring/io_uring.c:1063 tctx_task_work_run+0xf8/0x3d0 io_uring/io_uring.c:1135 tctx_task_work+0x6d/0xc0 io_uring/io_uring.c:1153 task_work_run+0x268/0x310 kernel/task_work.c:239 ptrace_notify+0x304/0x320 kernel/signal.c:2403 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0x14e/0x3e0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x13b/0x170 kernel/entry/common.c:218 do_syscall_64+0xda/0x1e0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283 netlink_trim+0x2c2/0x330 net/netlink/af_netlink.c:1313 netlink_unicast+0x9f/0x1260 net/netlink/af_netlink.c:1347 nlmsg_unicast include/net/netlink.h:1158 [inline] nlmsg_notify+0x21d/0x2f0 net/netlink/af_netlink.c:2602 rtnetlink_send+0x73/0x90 net/core/rtnetlink.c:770 rtnetlink_maybe_send include/linux/rtnetlink.h:18 [inline] tcf_add_notify net/sched/act_api.c:2068 [inline] tcf_action_add net/sched/act_api.c:2091 [inline] tc_ctl_action+0x146e/0x19d0 net/sched/act_api.c:2139 rtnetlink_rcv_msg+0x12fc/0x1410 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2551 rtnetlink_rcv+0x34/0x40 net/core/rtnetlink.c:6693 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:744 ____sys_sendmsg+0x877/0xb60 net/socket.c:2607 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2661 __sys_sendmsg net/socket.c:2690 [inline] __do_sys_sendmsg net/socket.c:2699 [inline] __se_sys_sendmsg net/socket.c:2697 [inline] __x64_sys_sendmsg+0x300/0x4a0 net/socket.c:2697 x64_sys_call+0x2da0/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: __nla_put lib/nlattr.c:1041 [inline] nla_put+0x1c6/0x230 lib/nlattr.c:1099 tcf_ife_dump+0x250/0x10b0 net/sched/act_ife.c:660 tcf_action_dump_old net/sched/act_api.c:1190 [inline] tcf_action_dump_1+0x85e/0x970 net/sched/act_api.c:1226 tcf_action_dump+0x1fd/0x460 net/sched/act_api.c:1250 tca_get_fill+0x519/0x7a0 net/sched/act_api.c:1648 tcf_add_notify_msg net/sched/act_api.c:2043 [inline] tcf_add_notify net/sched/act_api.c:2062 [inline] tcf_action_add net/sched/act_api.c:2091 [inline] tc_ctl_action+0x1365/0x19d0 net/sched/act_api.c:2139 rtnetlink_rcv_msg+0x12fc/0x1410 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2551 rtnetlink_rcv+0x34/0x40 net/core/rtnetlink.c:6693 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:744 ____sys_sendmsg+0x877/0xb60 net/socket.c:2607 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2661 __sys_sendmsg net/socket.c:2690 [inline] __do_sys_sendmsg net/socket.c:2699 [inline] __se_sys_sendmsg net/socket.c:2697 [inline] __x64_sys_sendmsg+0x300/0x4a0 net/socket.c:2697 x64_sys_call+0x2da0/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable opt created at: tcf_ife_dump+0xab/0x10b0 net/sched/act_ife.c:647 tcf_action_dump_old net/sched/act_api.c:1190 [inline] tcf_action_dump_1+0x85e/0x970 net/sched/act_api.c:1226 Bytes 158-159 of 216 are uninitialized Memory access of size 216 starts at ffff88811980e280 CPU: 1 UID: 0 PID: 5791 Comm: syz-executor190 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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