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Sat, 27 Mar 2021 20:38:14 -0700 (PDT) Date: Sat, 27 Mar 2021 20:38:14 -0700 In-Reply-To: <0000000000008f912605bd30d5d7@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c2987605be907e41@google.com> Subject: Re: [syzbot] UBSAN: shift-out-of-bounds in ___bpf_prog_run From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 0f4498ce Merge tag 'for-5.12/dm-fixes-2' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d734aad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4e9addca54f3b44 dashboard link: https://syzkaller.appspot.com/bug?extid=bed360704c521841c85d syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1424cd9ed00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1085497cd00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bed360704c521841c85d@syzkaller.appspotmail.com ================================================================================ UBSAN: shift-out-of-bounds in kernel/bpf/core.c:1421:2 shift exponent 248 is too large for 32-bit type 'unsigned int' CPU: 1 PID: 8388 Comm: syz-executor895 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327 ___bpf_prog_run.cold+0x20f/0x56c kernel/bpf/core.c:1421 __bpf_prog_run480+0x99/0xe0 kernel/bpf/core.c:1739 bpf_dispatcher_nop_func include/linux/bpf.h:659 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2091 [inline] bpf_trace_run2+0x12f/0x390 kernel/trace/bpf_trace.c:2128 __bpf_trace_tlb_flush+0xbd/0x100 include/trace/events/tlb.h:38 trace_tlb_flush+0xe0/0x1c0 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x48b/0x970 arch/x86/mm/tlb.c:563 unuse_temporary_mm arch/x86/kernel/alternative.c:842 [inline] __text_poke+0x541/0x8c0 arch/x86/kernel/alternative.c:938 text_poke_bp_batch+0x187/0x550 arch/x86/kernel/alternative.c:1190 text_poke_flush arch/x86/kernel/alternative.c:1347 [inline] text_poke_flush arch/x86/kernel/alternative.c:1344 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1354 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:126 jump_label_update+0x1da/0x400 kernel/jump_label.c:825 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 tracepoint_add_func+0x707/0xa90 kernel/tracepoint.c:303 tracepoint_probe_register_prio kernel/tracepoint.c:369 [inline] tracepoint_probe_register+0x9c/0xe0 kernel/tracepoint.c:389 __bpf_probe_register kernel/trace/bpf_trace.c:2154 [inline] bpf_probe_register+0x15a/0x1c0 kernel/trace/bpf_trace.c:2159 bpf_raw_tracepoint_open+0x34a/0x720 kernel/bpf/syscall.c:2878 __do_sys_bpf+0x2586/0x4f40 kernel/bpf/syscall.c:4435 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43f009 Code: Unable to access opcode bytes at RIP 0x43efdf. RSP: 002b:00007ffc64740b68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043f009 RDX: 0000000000000010 RSI: 0000000020000080 RDI: 0000000000000011 RBP: 0000000000402ff0 R08: 0000000000000000 R09: 0000000000400488 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403080 R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 ================================================================================