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h3-20020a5ecb43000000b007bee32346admr681iok.2.1705617245254; Thu, 18 Jan 2024 14:34:05 -0800 (PST) Date: Thu, 18 Jan 2024 14:34:05 -0800 In-Reply-To: <20240118221554.1749-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000006b968060f3ff654@google.com> Subject: Re: [syzbot] [net?] KASAN: use-after-free Read in __skb_flow_dissect (3) From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: use-after-free Read in __skb_flow_dissect ================================================================== BUG: KASAN: use-after-free in __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170 Read of size 1 at addr ffff88813c90000e by task syz-executor.0/5479 CPU: 0 PID: 5479 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-gb0d326da462e-dirty #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170 skb_flow_dissect_flow_keys include/linux/skbuff.h:1524 [inline] ___skb_get_hash net/core/flow_dissector.c:1791 [inline] __skb_get_hash+0xc7/0x540 net/core/flow_dissector.c:1856 skb_get_hash include/linux/skbuff.h:1566 [inline] ip_tunnel_xmit+0x1843/0x33b0 net/ipv4/ip_tunnel.c:748 ipip_tunnel_xmit+0x3cc/0x4e0 net/ipv4/ipip.c:308 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x137/0x6d0 net/core/dev.c:3563 __dev_queue_xmit+0x7b6/0x3ed0 net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] neigh_connected_output+0x426/0x5d0 net/core/neighbour.c:1592 neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0x82d/0x2540 net/ipv4/ip_output.c:235 __ip_finish_output net/ipv4/ip_output.c:313 [inline] __ip_finish_output+0x38b/0x650 net/ipv4/ip_output.c:295 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_mc_output+0x1dd/0x6a0 net/ipv4/ip_output.c:420 dst_output include/net/dst.h:451 [inline] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129 iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1daa/0x33b0 net/ipv4/ip_tunnel.c:831 ipgre_xmit+0x49b/0x980 net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x137/0x6d0 net/core/dev.c:3563 __dev_queue_xmit+0x7b6/0x3ed0 net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] __bpf_tx_skb net/core/filter.c:2135 [inline] __bpf_redirect_no_mac net/core/filter.c:2154 [inline] __bpf_redirect+0x797/0xad0 net/core/filter.c:2177 ____bpf_clone_redirect net/core/filter.c:2448 [inline] bpf_clone_redirect+0x2b2/0x420 net/core/filter.c:2420 ___bpf_prog_run+0x3e44/0xabc0 kernel/bpf/core.c:1986 __bpf_prog_run512+0xb7/0xf0 kernel/bpf/core.c:2227 bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x3d3/0x9c0 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0xb75/0x1dd0 net/bpf/test_run.c:1056 bpf_prog_test_run kernel/bpf/syscall.c:4107 [inline] __sys_bpf+0x11bf/0x4a00 kernel/bpf/syscall.c:5475 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f1f1107cce9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1f11d050c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f1f1119bf80 RCX: 00007f1f1107cce9 RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a RBP: 00007f1f110c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f1f1119bf80 R15: 00007ffc4749ef18 The buggy address belongs to the physical page: page:ffffea0004f24000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13c900 flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 057ff00000000000 ffffea0004f24008 ffffea0004f24008 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffff88813c8fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88813c8fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88813c900000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88813c900080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88813c900100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Tested on: commit: b0d326da Merge tag 'sched-urgent-2024-01-18' of git://.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1031cb63e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a5b728734a30ba3 dashboard link: https://syzkaller.appspot.com/bug?extid=bfde3bef047a81b8fde6 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=13167e57e80000