===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0x1c9/0x270 lib/usercopy.c:33 instrument_copy_to_user include/linux/instrumented.h:121 [inline] _copy_to_user+0x1c9/0x270 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:209 [inline] bpf_prog_test_run_raw_tp+0x931/0xb80 net/bpf/test_run.c:389 bpf_prog_test_run+0x784/0x820 kernel/bpf/syscall.c:3310 __sys_bpf+0xada/0x1230 kernel/bpf/syscall.c:4608 __do_sys_bpf kernel/bpf/syscall.c:4694 [inline] __se_sys_bpf kernel/bpf/syscall.c:4692 [inline] __ia32_sys_bpf+0xe1/0x130 kernel/bpf/syscall.c:4692 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable info created at: bpf_prog_test_run_raw_tp+0xeb/0xb80 net/bpf/test_run.c:340 bpf_prog_test_run+0x784/0x820 kernel/bpf/syscall.c:3310 Bytes 0-3 of 4 are uninitialized Memory access of size 4 starts at ffff88815fc1bc80 Data copied to user address 0000000020000384 ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 1 PID: 11238 Comm: syz-executor.5 Tainted: G B 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106 dump_stack+0x25/0x28 lib/dump_stack.c:113 panic+0x44f/0xdeb kernel/panic.c:232 kmsan_report+0x2e9/0x2f0 mm/kmsan/report.c:200 kmsan_internal_check_memory+0x3dd/0x440 mm/kmsan/core.c:354 kmsan_copy_to_user+0xe1/0xf0 mm/kmsan/hooks.c:247 instrument_copy_to_user include/linux/instrumented.h:121 [inline] _copy_to_user+0x1c9/0x270 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:209 [inline] bpf_prog_test_run_raw_tp+0x931/0xb80 net/bpf/test_run.c:389 bpf_prog_test_run+0x784/0x820 kernel/bpf/syscall.c:3310 __sys_bpf+0xada/0x1230 kernel/bpf/syscall.c:4608 __do_sys_bpf kernel/bpf/syscall.c:4694 [inline] __se_sys_bpf kernel/bpf/syscall.c:4692 [inline] __ia32_sys_bpf+0xe1/0x130 kernel/bpf/syscall.c:4692 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6eac549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 RSP: 002b:00000000f44a65fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165 RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000380 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 39: 00 00 00 3c: 0f .byte 0xf 3d: 1f (bad) 3e: 44 rex.R