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Message-ID: <6954bc70.050a0220.a1b6.0310.GAE@google.com> Date: Tue, 30 Dec 2025 22:02:24 -0800 From: syzbot <syzbot+619b9ef527f510a57cfc@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev, sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb Hello, syzbot found the following issue on: HEAD commit: 3f0e9c8cefa9 Merge tag 'block-6.19-20251226' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d784fc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14 dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151f1b92580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144f5022580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7f2d5650d243/disk-3f0e9c8c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/069034860f2d/vmlinux-3f0e9c8c.xz kernel image: https://storage.googleapis.com/syzbot-assets/90d1c240dc1b/bzImage-3f0e9c8c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+619b9ef527f510a57cfc@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1 bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: pskb_expand_head+0x310/0x15d0 net/core/skbuff.c:2290 __skb_cow include/linux/skbuff.h:3853 [inline] skb_cow_head include/linux/skbuff.h:3887 [inline] bpf_skb_net_grow net/core/filter.c:3511 [inline] ____bpf_skb_adjust_room net/core/filter.c:3754 [inline] bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699 ___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: skb_data_move+0x424/0x570 include/linux/skbuff.h:-1 skb_postpush_data_move include/linux/skbuff.h:4639 [inline] bpf_skb_generic_push net/core/filter.c:3267 [inline] bpf_skb_net_hdr_push net/core/filter.c:3305 [inline] bpf_skb_net_grow net/core/filter.c:3542 [inline] ____bpf_skb_adjust_room net/core/filter.c:3754 [inline] bpf_skb_adjust_room+0x116c/0x3310 net/core/filter.c:3699 ___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4960 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586 pskb_expand_head+0x1fc/0x15d0 net/core/skbuff.c:2282 __skb_cow include/linux/skbuff.h:3853 [inline] skb_cow_head include/linux/skbuff.h:3887 [inline] bpf_skb_net_grow net/core/filter.c:3511 [inline] ____bpf_skb_adjust_room net/core/filter.c:3754 [inline] bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699 ___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 6072 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ===================================================== --- 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 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. 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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