Hello, syzbot found the following issue on: HEAD commit: cea5425829f7 Add linux-next specific files for 20240930 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14eccea9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=41a28720ed564c6a dashboard link: https://syzkaller.appspot.com/bug?extid=61123a5daeb9f7454599 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/566995596f19/disk-cea54258.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e7c506c1c71d/vmlinux-cea54258.xz kernel image: https://storage.googleapis.com/syzbot-assets/7fcb4468b8c0/bzImage-cea54258.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61123a5daeb9f7454599@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: out-of-bounds in instrument_memcpy_before include/linux/instrumented.h:163 [inline] BUG: KASAN: out-of-bounds in copy_from_kernel_nofault+0x7a/0x2f0 mm/maccess.c:35 Read of size 6 at addr fffffffffffffffd by task syz.1.54/5558 CPU: 1 UID: 0 PID: 5558 Comm: syz.1.54 Not tainted 6.12.0-rc1-next-20240930-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_memcpy_before include/linux/instrumented.h:163 [inline] copy_from_kernel_nofault+0x7a/0x2f0 mm/maccess.c:35 bpf_probe_read_kernel_common include/linux/bpf.h:2960 [inline] ____bpf_probe_read_kernel kernel/trace/bpf_trace.c:239 [inline] bpf_probe_read_kernel+0x2a/0x70 kernel/trace/bpf_trace.c:236 bpf_prog_fe7b69aea4fa28bf+0x43/0x45 __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run_xdp include/net/xdp.h:514 [inline] bpf_test_run+0x4b1/0xa90 net/bpf/test_run.c:431 bpf_prog_test_run_xdp+0x7da/0x11e0 net/bpf/test_run.c:1319 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5e6c17dff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5e6d02a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5e6c335f80 RCX: 00007f5e6c17dff9 RDX: 000000000000003b RSI: 0000000020000240 RDI: 000000000000000a RBP: 00007f5e6c1f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5e6c335f80 R15: 00007ffdc493ae58 </TASK> Memory state around the buggy address: fffffffffffffe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffffffffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffffffffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5558 Comm: syz.1.54 Not tainted 6.12.0-rc1-next-20240930-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:kasan_metadata_fetch_row+0x12/0x30 mm/kasan/report_generic.c:186 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <48> 8b 0c 06 48 8b 44 06 08 48 89 47 08 48 89 0f c3 cc cc cc cc 66 RSP: 0018:ffffc900049976d8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 78f03800465e2000 RDX: ffffc900045d9000 RSI: 0000000000000000 RDI: ffffc90004997710 RBP: ffffc90004997758 R08: ffffffff8bc0f2d3 R09: 0000000000000020 R10: dffffc0000000000 R11: fffff52000932ee1 R12: ffffc90004997710 R13: 0000000000000080 R14: ffffffffffffff80 R15: ffffc900049976f0 FS: 00007f5e6d02a6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558b7a5808 CR3: 000000003075e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> print_memory_metadata mm/kasan/report.c:464 [inline] print_report+0x4df/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_memcpy_before include/linux/instrumented.h:163 [inline] copy_from_kernel_nofault+0x7a/0x2f0 mm/maccess.c:35 bpf_probe_read_kernel_common include/linux/bpf.h:2960 [inline] ____bpf_probe_read_kernel kernel/trace/bpf_trace.c:239 [inline] bpf_probe_read_kernel+0x2a/0x70 kernel/trace/bpf_trace.c:236 bpf_prog_fe7b69aea4fa28bf+0x43/0x45 __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run_xdp include/net/xdp.h:514 [inline] bpf_test_run+0x4b1/0xa90 net/bpf/test_run.c:431 bpf_prog_test_run_xdp+0x7da/0x11e0 net/bpf/test_run.c:1319 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5e6c17dff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5e6d02a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5e6c335f80 RCX: 00007f5e6c17dff9 RDX: 000000000000003b RSI: 0000000020000240 RDI: 000000000000000a RBP: 00007f5e6c1f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5e6c335f80 R15: 00007ffdc493ae58 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_metadata_fetch_row+0x12/0x30 mm/kasan/report_generic.c:186 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <48> 8b 0c 06 48 8b 44 06 08 48 89 47 08 48 89 0f c3 cc cc cc cc 66 RSP: 0018:ffffc900049976d8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 78f03800465e2000 RDX: ffffc900045d9000 RSI: 0000000000000000 RDI: ffffc90004997710 RBP: ffffc90004997758 R08: ffffffff8bc0f2d3 R09: 0000000000000020 R10: dffffc0000000000 R11: fffff52000932ee1 R12: ffffc90004997710 R13: 0000000000000080 R14: ffffffffffffff80 R15: ffffc900049976f0 FS: 00007f5e6d02a6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558b7a5808 CR3: 000000003075e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 66 0f 1f 00 nopw (%rax) 1c: 48 c1 ee 03 shr $0x3,%rsi 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 48 8b 0c 06 mov (%rsi,%rax,1),%rcx <-- trapping instruction 2e: 48 8b 44 06 08 mov 0x8(%rsi,%rax,1),%rax 33: 48 89 47 08 mov %rax,0x8(%rdi) 37: 48 89 0f mov %rcx,(%rdi) 3a: c3 ret 3b: cc int3 3c: cc int3 3d: cc int3 3e: cc int3 3f: 66 data16 --- 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@xxxxxxxxxxxxxxxx. 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
