================================================================== BUG: KASAN: use-after-free in get_kprobe+0xa1/0xc0 kernel/kprobes.c:372 Read of size 8 at addr ffff888042d86528 by task syz-executor.4/6599 CPU: 1 PID: 6599 Comm: syz-executor.4 Not tainted 5.10.105 #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:1840 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9663 perf_try_init_event+0x130/0x570 kernel/events/core.c:11041 perf_init_event kernel/events/core.c:11093 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11371 perf_event_alloc kernel/events/core.c:11750 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11848 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fca300e8b19 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:00007fca2d65e188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fca301fbf60 RCX: 00007fca300e8b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000500 RBP: 00007fca30142f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd8d96f03f R14: 00007fca2d65e300 R15: 0000000000022000 Allocated by task 6431: 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] alloc_aggr_kprobe+0x41/0x190 kernel/kprobes.c:822 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:1840 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9663 perf_try_init_event+0x130/0x570 kernel/events/core.c:11041 perf_init_event kernel/events/core.c:11093 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11371 perf_event_alloc kernel/events/core.c:11750 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11848 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 ffff888042d86500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff888042d86500, ffff888042d865c0) The buggy address belongs to the page: page:0000000098503792 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888042d86c00 pfn:0x42d86 flags: 0x100000000000200(slab) raw: 0100000000000200 ffffea000035fbc0 0000000500000003 ffff888007c41500 raw: ffff888042d86c00 000000008010000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888042d86400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888042d86480: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888042d86500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888042d86580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888042d86600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs (loop5): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop5): couldn't mount as ext2 due to feature incompatibilities SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=6616 comm=syz-executor.2 EXT4-fs (loop2): VFS: Can't find ext4 filesystem EXT4-fs (loop5): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop5): couldn't mount as ext2 due to feature incompatibilities SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=6663 comm=syz-executor.2