================================================================== BUG: KASAN: use-after-free in get_kprobe+0xa1/0xc0 kernel/kprobes.c:372 Read of size 8 at addr ffff88800cf65428 by task syz-executor.3/5289 CPU: 1 PID: 5289 Comm: syz-executor.3 Not tainted 5.10.90 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x37/0x7c mm/kasan/report.c:562 get_kprobe+0xa1/0xc0 kernel/kprobes.c:372 __recover_optprobed_insn+0x31/0x220 arch/x86/kernel/kprobes/opt.c:44 recover_probed_instruction+0x1c/0xf0 arch/x86/kernel/kprobes/core.c:275 can_optimize+0x231/0x400 arch/x86/kernel/kprobes/opt.c:321 arch_prepare_optimized_kprobe+0x3e/0x5f0 arch/x86/kernel/kprobes/opt.c:406 __prepare_optimized_kprobe kernel/kprobes.c:805 [inline] alloc_aggr_kprobe+0x140/0x190 kernel/kprobes.c:828 try_to_optimize_kprobe kernel/kprobes.c:853 [inline] register_kprobe kernel/kprobes.c:1740 [inline] register_kprobe+0xb78/0x1330 kernel/kprobes.c:1682 __register_trace_kprobe kernel/trace/trace_kprobe.c:514 [inline] __register_trace_kprobe+0x262/0x2d0 kernel/trace/trace_kprobe.c:482 create_local_trace_kprobe+0x1e6/0x3b0 kernel/trace/trace_kprobe.c:1837 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9602 perf_try_init_event+0x130/0x570 kernel/events/core.c:10980 perf_init_event kernel/events/core.c:11032 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11310 perf_event_alloc kernel/events/core.c:11689 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11787 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc6d329fb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc6d0815188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fc6d33b2f60 RCX: 00007fc6d329fb19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80 RBP: 00007fc6d32f9f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca18a253f R14: 00007fc6d0815300 R15: 0000000000022000 Allocated by task 4545: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] call_usermodehelper_setup+0xa2/0x2f0 kernel/umh.c:363 call_modprobe kernel/kmod.c:93 [inline] __request_module+0x3f5/0x9d0 kernel/kmod.c:170 ctrl_getfamily+0x1e0/0x5a0 net/netlink/genetlink.c:1046 genl_family_rcv_msg_doit+0x22d/0x330 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x33c/0x5a0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x14b/0x430 net/netlink/af_netlink.c:2507 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x53a/0x7e0 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x901/0xdf0 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x150/0x190 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1981 __do_sys_sendto net/socket.c:1993 [inline] __se_sys_sendto net/socket.c:1989 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1989 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88800cf65400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff88800cf65400, ffff88800cf654c0) The buggy address belongs to the page: page:000000009dc415d4 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800cf65400 pfn:0xcf65 flags: 0x100000000000200(slab) raw: 0100000000000200 ffffea00006afc08 ffffea0000365c08 ffff888007c41500 raw: ffff88800cf65400 000000000010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800cf65300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88800cf65380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff88800cf65400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88800cf65480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88800cf65500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== general protection fault, probably for non-canonical address 0xdffffd2d80000015: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000096c000000a8-0x0000096c000000af] CPU: 1 PID: 5289 Comm: syz-executor.3 Tainted: G B 5.10.90 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:get_kprobe+0x82/0xc0 kernel/kprobes.c:372 Code: f3 ff ff 4c 89 e0 48 c1 e8 03 80 3c 18 00 75 3b 4d 8b 24 24 4d 85 e4 74 1e e8 ba f3 ff ff 49 8d 7c 24 28 48 89 f8 48 c1 e8 03 <80> 3c 18 00 75 14 49 39 6c 24 28 75 c7 e8 9c f3 ff ff 4c 89 e0 5b RSP: 0018:ffff8880193df950 EFLAGS: 00010212 RAX: 0000012d80000015 RBX: dffffc0000000000 RCX: ffffc90006bc9000 RDX: 0000000000040000 RSI: ffffffff813fa5f6 RDI: 0000096c000000a8 RBP: ffffffff8100002b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000096c00000080 R13: dffffc0000000000 R14: ffffffff8100002d R15: ffff8880193dfaf8 FS: 00007fc6d0815700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6d33b3018 CR3: 0000000048fca000 CR4: 0000000000350ee0 Call Trace: __recover_optprobed_insn+0x31/0x220 arch/x86/kernel/kprobes/opt.c:44 recover_probed_instruction+0x1c/0xf0 arch/x86/kernel/kprobes/core.c:275 can_optimize+0x231/0x400 arch/x86/kernel/kprobes/opt.c:321 arch_prepare_optimized_kprobe+0x3e/0x5f0 arch/x86/kernel/kprobes/opt.c:406 __prepare_optimized_kprobe kernel/kprobes.c:805 [inline] alloc_aggr_kprobe+0x140/0x190 kernel/kprobes.c:828 try_to_optimize_kprobe kernel/kprobes.c:853 [inline] register_kprobe kernel/kprobes.c:1740 [inline] register_kprobe+0xb78/0x1330 kernel/kprobes.c:1682 __register_trace_kprobe kernel/trace/trace_kprobe.c:514 [inline] __register_trace_kprobe+0x262/0x2d0 kernel/trace/trace_kprobe.c:482 create_local_trace_kprobe+0x1e6/0x3b0 kernel/trace/trace_kprobe.c:1837 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9602 perf_try_init_event+0x130/0x570 kernel/events/core.c:10980 perf_init_event kernel/events/core.c:11032 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11310 perf_event_alloc kernel/events/core.c:11689 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11787 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc6d329fb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc6d0815188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fc6d33b2f60 RCX: 00007fc6d329fb19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80 RBP: 00007fc6d32f9f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca18a253f R14: 00007fc6d0815300 R15: 0000000000022000 Modules linked in: ---[ end trace 5eac0fe4ef69a0d6 ]--- RIP: 0010:get_kprobe+0x82/0xc0 kernel/kprobes.c:372 Code: f3 ff ff 4c 89 e0 48 c1 e8 03 80 3c 18 00 75 3b 4d 8b 24 24 4d 85 e4 74 1e e8 ba f3 ff ff 49 8d 7c 24 28 48 89 f8 48 c1 e8 03 <80> 3c 18 00 75 14 49 39 6c 24 28 75 c7 e8 9c f3 ff ff 4c 89 e0 5b RSP: 0018:ffff8880193df950 EFLAGS: 00010212 RAX: 0000012d80000015 RBX: dffffc0000000000 RCX: ffffc90006bc9000 RDX: 0000000000040000 RSI: ffffffff813fa5f6 RDI: 0000096c000000a8 RBP: ffffffff8100002b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000096c00000080 R13: dffffc0000000000 R14: ffffffff8100002d R15: ffff8880193dfaf8 FS: 00007fc6d0815700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6d33b3018 CR3: 0000000048fca000 CR4: 0000000000350ee0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. nfs4: Unknown parameter '\:}{&&' ---------------- Code disassembly (best guess): 0: f3 ff repz (bad) 2: ff 4c 89 e0 decl -0x20(%rcx,%rcx,4) 6: 48 c1 e8 03 shr $0x3,%rax a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) e: 75 3b jne 0x4b 10: 4d 8b 24 24 mov (%r12),%r12 14: 4d 85 e4 test %r12,%r12 17: 74 1e je 0x37 19: e8 ba f3 ff ff callq 0xfffff3d8 1e: 49 8d 7c 24 28 lea 0x28(%r12),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 75 14 jne 0x44 30: 49 39 6c 24 28 cmp %rbp,0x28(%r12) 35: 75 c7 jne 0xfffffffe 37: e8 9c f3 ff ff callq 0xfffff3d8 3c: 4c 89 e0 mov %r12,%rax 3f: 5b pop %rbx