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Date: Wed, 29 Nov 2023 02:00:33 -0800 From: syzbot <syzbot+2cb7b1bd08dc77ae7f89@...kaller.appspotmail.com> To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] KMSAN: uninit-value in ipgre_xmit Hello, syzbot found the following issue on: HEAD commit: 18d46e76d7c2 Merge tag 'for-6.7-rc3-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1412e7e8e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f711bc2a7eb1db25 dashboard link: https://syzkaller.appspot.com/bug?extid=2cb7b1bd08dc77ae7f89 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cb96093de792/disk-18d46e76.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/630ca4e2d778/vmlinux-18d46e76.xz kernel image: https://storage.googleapis.com/syzbot-assets/65573a727973/bzImage-18d46e76.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2cb7b1bd08dc77ae7f89@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __gre_xmit net/ipv4/ip_gre.c:469 [inline] BUG: KMSAN: uninit-value in ipgre_xmit+0xdc2/0xe20 net/ipv4/ip_gre.c:662 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0xdc2/0xe20 net/ipv4/ip_gre.c:662 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3545 [inline] dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3561 __dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4346 dev_queue_xmit include/linux/netdevice.h:3134 [inline] __bpf_tx_skb net/core/filter.c:2133 [inline] __bpf_redirect_no_mac net/core/filter.c:2163 [inline] __bpf_redirect+0xdd7/0x1600 net/core/filter.c:2186 ____bpf_clone_redirect net/core/filter.c:2457 [inline] bpf_clone_redirect+0x328/0x470 net/core/filter.c:2429 ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1958 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2199 bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x482/0xb00 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x14e5/0x1f20 net/bpf/test_run.c:1045 bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4040 __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5401 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline] __se_sys_bpf kernel/bpf/syscall.c:5485 [inline] __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5485 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:230 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:255 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:293 entry_SYSENTER_compat_after_hwframe+0x70/0x7a Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560 pskb_expand_head+0x226/0x1a00 net/core/skbuff.c:2098 skb_ensure_writable+0x3d3/0x460 net/core/skbuff.c:5958 __bpf_try_make_writable net/core/filter.c:1662 [inline] bpf_try_make_writable net/core/filter.c:1668 [inline] bpf_try_make_head_writable net/core/filter.c:1676 [inline] ____bpf_clone_redirect net/core/filter.c:2451 [inline] bpf_clone_redirect+0x17f/0x470 net/core/filter.c:2429 ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1958 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2199 bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x482/0xb00 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x14e5/0x1f20 net/bpf/test_run.c:1045 bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4040 __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5401 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline] __se_sys_bpf kernel/bpf/syscall.c:5485 [inline] __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5485 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:230 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:255 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:293 entry_SYSENTER_compat_after_hwframe+0x70/0x7a CPU: 1 PID: 8859 Comm: syz-executor.2 Not tainted 6.7.0-rc3-syzkaller-00024-g18d46e76d7c2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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