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Message-ID: <695ec9af.050a0220.1c677c.037d.GAE@google.com> Date: Wed, 07 Jan 2026 13:01:35 -0800 From: syzbot ci <syzbot+cicac8180258d8bceb@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net, dxu@...uu.xyz, eddyz87@...il.com, edumazet@...gle.com, electronlsr@...il.com, ftyghome@...il.com, gplhust955@...il.com, haoluo@...gle.com, haoran.ni.cs@...il.com, horms@...nel.org, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, martin.lau@...ux.dev, mathieu.desnoyers@...icios.com, mattbobrowski@...gle.com, mhiramat@...nel.org, netdev@...r.kernel.org, pabeni@...hat.com, rostedt@...dmis.org, sdf@...ichev.me, song@...nel.org, yonghong.song@...ux.dev Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: bpf: Fix memory access flags in helper prototypes syzbot ci has tested the following series [v1] bpf: Fix memory access flags in helper prototypes https://lore.kernel.org/all/20260107-helper_proto-v1-0-e387e08271cc@gmail.com * [PATCH bpf 1/2] bpf: Fix memory access flags in helper prototypes * [PATCH bpf 2/2] bpf: Require ARG_PTR_TO_MEM with memory flag and found the following issue: WARNING in check_helper_call Full report is available here: https://ci.syzbot.org/series/020c2fa8-b95d-4273-9bc0-2f82fa714a8e *** WARNING in check_helper_call tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: ab86d0bf01f6d0e37fd67761bb62918321b64efc arch: amd64 compiler: Debian clang version 21.1.8 (++20251202083448+f68f64eb8130-1~exp1~20251202083504.46), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/9a24b0e7-35e4-4718-b939-3b210b6b5126/config C repro: https://ci.syzbot.org/findings/8fcbdcf8-4480-46d8-b7a8-f1de9401a8ac/c_repro syz repro: https://ci.syzbot.org/findings/8fcbdcf8-4480-46d8-b7a8-f1de9401a8ac/syz_repro ------------[ cut here ]------------ verifier bug: incorrect func proto bpf_tcp_raw_check_syncookie_ipv6#207 WARNING: kernel/bpf/verifier.c:11546 at check_helper_call+0xc00/0x6e10 kernel/bpf/verifier.c:11546, CPU#0: syz.0.17/5981 Modules linked in: CPU: 0 UID: 0 PID: 5981 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:check_helper_call+0xc16/0x6e10 kernel/bpf/verifier.c:11546 Code: ef e6 ff 49 bf 00 00 00 00 00 fc ff df 48 8d 1d a0 c2 ea 0d 44 8b 64 24 24 44 89 e7 e8 d3 32 0c 00 48 89 df 48 89 c6 44 89 e2 <67> 48 0f b9 3a 49 81 c6 80 08 00 00 44 89 e7 e8 b6 32 0c 00 4c 89 RSP: 0018:ffffc90007116fa0 EFLAGS: 00010246 RAX: ffffffff8b934740 RBX: ffffffff8fc645d0 RCX: dffffc0000000000 RDX: 00000000000000cf RSI: ffffffff8b934740 RDI: ffffffff8fc645d0 RBP: ffffc900071171b0 R08: ffff88816b42ba80 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000000 R12: 00000000000000cf R13: f8f8f8f8f8f8f8f8 R14: ffff888112440000 R15: dffffc0000000000 FS: 000055557af7b500(0000) GS:ffff88818e40e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd892207dac CR3: 0000000161682000 CR4: 00000000000006f0 Call Trace: <TASK> do_check_insn kernel/bpf/verifier.c:20417 [inline] do_check+0x99eb/0xec30 kernel/bpf/verifier.c:20598 do_check_common+0x19cc/0x25b0 kernel/bpf/verifier.c:23882 do_check_main kernel/bpf/verifier.c:23965 [inline] bpf_check+0x5f0d/0x1c4a0 kernel/bpf/verifier.c:25272 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3088 __sys_bpf+0x570/0x920 kernel/bpf/syscall.c:6164 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd891f9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee24b6bb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd892205fa0 RCX: 00007fd891f9acb9 RDX: 0000000000000094 RSI: 0000200000000300 RDI: 0000000000000005 RBP: 00007fd892008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd892205fac R14: 00007fd892205fa0 R15: 00007fd892205fa0 </TASK> ---------------- Code disassembly (best guess): 0: ef out %eax,(%dx) 1: e6 ff out %al,$0xff 3: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 a: fc ff df d: 48 8d 1d a0 c2 ea 0d lea 0xdeac2a0(%rip),%rbx # 0xdeac2b4 14: 44 8b 64 24 24 mov 0x24(%rsp),%r12d 19: 44 89 e7 mov %r12d,%edi 1c: e8 d3 32 0c 00 call 0xc32f4 21: 48 89 df mov %rbx,%rdi 24: 48 89 c6 mov %rax,%rsi 27: 44 89 e2 mov %r12d,%edx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 49 81 c6 80 08 00 00 add $0x880,%r14 36: 44 89 e7 mov %r12d,%edi 39: e8 b6 32 0c 00 call 0xc32f4 3e: 4c rex.WR 3f: 89 .byte 0x89 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
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