syzbot

 sign-in | mailing list | source | docs
🐞 Open [1645]
≡ Subsystems
🐞 Fixed [6009]
🐞 Invalid [14804]
⬇ Missing Backports [135]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KASAN: use-after-free Read in uprobe_munmap

Status: auto-closed as invalid on 2021/03/30 16:35
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+2f6d683983e3905ad8d6@syzkaller.appspotmail.com
First crash: 1457d, last: 1450d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] uprobes: Fix kasan UAF reported by syzbot 2 (2) 2021/02/06 01:50
KASAN: use-after-free Read in uprobe_munmap 0 (1) 2021/02/02 06:43

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in find_node_in_range syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1271 [inline]
BUG: KASAN: use-after-free in vma_has_uprobes syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1414 [inline]
BUG: KASAN: use-after-free in uprobe_munmap+0x485/0x560 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1435
Read of size 8 at addr ffff888020173968 by task syz-executor.5/15653

CPU: 1 PID: 15653 Comm: syz-executor.5 Not tainted 5.11.0-rc6-next-20210205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/report.c:232
 __kasan_report syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/report.c:399 [inline]
 kasan_report.cold+0x7c/0xd8 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/report.c:416
 find_node_in_range syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1271 [inline]
 vma_has_uprobes syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1414 [inline]
 uprobe_munmap+0x485/0x560 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1435
 unmap_single_vma+0xe9/0x300 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:1472
 zap_page_range_single+0x2c6/0x440 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:1579
 unmap_mapping_range_vma syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:3166 [inline]
 unmap_mapping_range_tree syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:3187 [inline]
 unmap_mapping_pages+0x223/0x2a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:3219
 truncate_pagecache+0x51/0x90 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/truncate.c:753
 ext4_setattr+0x11c7/0x1fe0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/ext4/inode.c:5498
 notify_change+0xb28/0x10f0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/attr.c:398
 do_truncate+0x13c/0x200 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/open.c:64
 handle_truncate syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:3018 [inline]
 do_open syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:3369 [inline]
 path_openat+0x20e4/0x27e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:3498
 do_filp_open+0x17e/0x3c0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namei.c:3525
 do_sys_openat2+0x16d/0x420 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/open.c:1187
 do_sys_open syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/open.c:1203 [inline]
 __do_sys_open syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/open.c:1211 [inline]
 __se_sys_open syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/open.c:1207 [inline]
 __x64_sys_open+0x119/0x1c0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/open.c:1207
 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465b09
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:00007fc033413188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 0000000000000000 RSI: 000000000000c202 RDI: 0000000020000040
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffed17cb4ef R14: 00007fc033413300 R15: 0000000000022000

Allocated by task 15653:
 kasan_save_stack+0x1b/0x40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:38
 kasan_set_track syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:46 [inline]
 set_alloc_info syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:403 [inline]
 ____kasan_kmalloc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc.constprop.0+0xa0/0xd0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:406
 kmalloc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/slab.h:556 [inline]
 kzalloc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/slab.h:686 [inline]
 alloc_uprobe syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:731 [inline]
 __uprobe_register+0x19c/0x850 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1167
 trace_uprobe_enable syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_uprobe.c:1060 [inline]
 probe_event_enable+0x357/0xa00 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_uprobe.c:1129
 trace_uprobe_register+0x443/0x880 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_uprobe.c:1456
 perf_trace_event_reg syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:129 [inline]
 perf_trace_event_init+0x549/0xa20 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:204
 perf_uprobe_init+0x16f/0x210 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:336
 perf_uprobe_event_init+0xff/0x1c0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9721
 perf_try_init_event+0x12a/0x560 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11038
 perf_init_event syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11090 [inline]
 perf_event_alloc.part.0+0xe3b/0x3960 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11370
 perf_event_alloc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11749 [inline]
 __do_sys_perf_event_open+0x647/0x2e60 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11847
 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 15653:
 kasan_save_stack+0x1b/0x40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:357
 ____kasan_slab_free.part.0+0xe1/0x110 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/common.c:364
 kasan_slab_free syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/kasan.h:191 [inline]
 slab_free_hook syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x82/0x1d0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:1600
 slab_free syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:3161 [inline]
 kfree+0xe5/0x7b0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:4202
 put_uprobe syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:612 [inline]
 put_uprobe+0x13b/0x190 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:601
 uprobe_apply+0xfc/0x130 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/uprobes.c:1231
 uprobe_perf_open syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_uprobe.c:1311 [inline]
 trace_uprobe_register+0x5c9/0x880 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_uprobe.c:1463
 perf_trace_event_open syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:186 [inline]
 perf_trace_event_init syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:208 [inline]
 perf_trace_event_init+0x17a/0xa20 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:195
 perf_uprobe_init+0x16f/0x210 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/trace/trace_event_perf.c:336
 perf_uprobe_event_init+0xff/0x1c0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9721
 perf_try_init_event+0x12a/0x560 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11038
 perf_init_event syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11090 [inline]
 perf_event_alloc.part.0+0xe3b/0x3960 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11370
 perf_event_alloc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11749 [inline]
 __do_sys_perf_event_open+0x647/0x2e60 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:11847
 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888020173800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 360 bytes inside of
 512-byte region [ffff888020173800, ffff888020173a00)
The buggy address belongs to the page:
page:0000000009aebb21 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888020173400 pfn:0x20172
head:0000000009aebb21 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 ffffea0000a28908 ffffea00006abc88 ffff888010841c80
raw: ffff888020173400 0000000000080004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888020173800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888020173880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888020173900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff888020173980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888020173a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (19):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/08 19:29 linux-next aa2b88209686 2ce644fc .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/08 09:27 linux-next aa2b88209686 2ce644fc .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/07 12:23 linux-next aa2b88209686 2ce644fc .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/06 05:34 linux-next aa2b88209686 23a562df .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/04 03:59 linux-next 58b6c0e507b7 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/04 02:19 linux-next 58b6c0e507b7 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/03 18:24 linux-next 58b6c0e507b7 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/03 15:45 linux-next 58b6c0e507b7 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/03 15:27 linux-next 58b6c0e507b7 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/03 13:16 linux-next fb2a9c320987 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/03 07:40 linux-next fb2a9c320987 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/03 02:00 linux-next fb2a9c320987 624dad51 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/02 11:46 linux-next fd821bf0ed9a 19e09687 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/02 08:34 linux-next fd821bf0ed9a 19e09687 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/02 06:43 linux-next fd821bf0ed9a e6b95f32 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/02 04:19 linux-next fd821bf0ed9a e6b95f32 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/02 04:05 linux-next fd821bf0ed9a e6b95f32 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/01 20:26 linux-next fd821bf0ed9a e6b95f32 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
2021/02/01 16:42 linux-next fd821bf0ed9a e6b95f32 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in uprobe_munmap
* Struck through repros no longer work on HEAD.