KASAN: use-after-free Read in cma_cancel_operation
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syzbot
Nov 2, 2019, 2:20:09 PM11/2/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: ef244c30 Linux 4.19.81
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13ef76a4e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a3e67c0671e5c5e7
dashboard link: https://syzkaller.appspot.com/bug?extid=74ab2079df15699ca121
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+74ab20...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xdc/0xf5
lib/list_debug.c:54
Read of size 8 at addr ffff888098541568 by task syz-executor.0/14118
CPU: 1 PID: 14118 Comm: syz-executor.0 Not tainted 4.19.81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
__list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
__list_del_entry include/linux/list.h:117 [inline]
list_del include/linux/list.h:125 [inline]
cma_cancel_listens drivers/infiniband/core/cma.c:1625 [inline]
cma_cancel_operation drivers/infiniband/core/cma.c:1653 [inline]
cma_cancel_operation+0x2d7/0xa10 drivers/infiniband/core/cma.c:1641
rdma_destroy_id+0x8d/0xab0 drivers/infiniband/core/cma.c:1717
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413ae1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff96164b50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413ae1
RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000761fe0 R09: ffffffffffffffff
R10: 00007fff96164c20 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000000003 R14: 0000000000761fe8 R15: 000000000075bf2c
Allocated by task 14127:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc mm/kasan/kasan.c:553 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
__rdma_create_id+0x5e/0x610 drivers/infiniband/core/cma.c:784
ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506
ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689
__vfs_write+0x114/0x810 fs/read_write.c:485
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0x14f/0x2d0 fs/read_write.c:599
__do_sys_write fs/read_write.c:611 [inline]
__se_sys_write fs/read_write.c:608 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:608
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 14125:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3503 [inline]
kfree+0xcf/0x220 mm/slab.c:3822
rdma_destroy_id+0x723/0xab0 drivers/infiniband/core/cma.c:1752
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888098541380
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 488 bytes inside of
2048-byte region [ffff888098541380, ffff888098541b80)
The buggy address belongs to the page:
page:ffffea0002615000 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0
compound_mapcount: 0
flags: 0x1fffc0000008100(slab|head)
raw: 01fffc0000008100 ffffea000270c488 ffffea0002059788 ffff88812c3f0c40
raw: 0000000000000000 ffff888098540280 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888098541400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888098541480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888098541500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888098541580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888098541600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
kobject: 'loop3' (000000003254cf0b): kobject_uevent_env
---
This bug 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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: ef244c30 Linux 4.19.81
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13ef76a4e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a3e67c0671e5c5e7
dashboard link: https://syzkaller.appspot.com/bug?extid=74ab2079df15699ca121
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+74ab20...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xdc/0xf5
lib/list_debug.c:54
Read of size 8 at addr ffff888098541568 by task syz-executor.0/14118
CPU: 1 PID: 14118 Comm: syz-executor.0 Not tainted 4.19.81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
__list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
__list_del_entry include/linux/list.h:117 [inline]
list_del include/linux/list.h:125 [inline]
cma_cancel_listens drivers/infiniband/core/cma.c:1625 [inline]
cma_cancel_operation drivers/infiniband/core/cma.c:1653 [inline]
cma_cancel_operation+0x2d7/0xa10 drivers/infiniband/core/cma.c:1641
rdma_destroy_id+0x8d/0xab0 drivers/infiniband/core/cma.c:1717
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413ae1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff96164b50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413ae1
RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000761fe0 R09: ffffffffffffffff
R10: 00007fff96164c20 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000000003 R14: 0000000000761fe8 R15: 000000000075bf2c
Allocated by task 14127:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc mm/kasan/kasan.c:553 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
__rdma_create_id+0x5e/0x610 drivers/infiniband/core/cma.c:784
ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506
ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689
__vfs_write+0x114/0x810 fs/read_write.c:485
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0x14f/0x2d0 fs/read_write.c:599
__do_sys_write fs/read_write.c:611 [inline]
__se_sys_write fs/read_write.c:608 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:608
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 14125:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3503 [inline]
kfree+0xcf/0x220 mm/slab.c:3822
rdma_destroy_id+0x723/0xab0 drivers/infiniband/core/cma.c:1752
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888098541380
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 488 bytes inside of
2048-byte region [ffff888098541380, ffff888098541b80)
The buggy address belongs to the page:
page:ffffea0002615000 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0
compound_mapcount: 0
flags: 0x1fffc0000008100(slab|head)
raw: 01fffc0000008100 ffffea000270c488 ffffea0002059788 ffff88812c3f0c40
raw: 0000000000000000 ffff888098540280 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888098541400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888098541480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888098541500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888098541580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888098541600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
kobject: 'loop3' (000000003254cf0b): kobject_uevent_env
---
This bug 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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jan 31, 2020, 3:58:10 PM1/31/20
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 7cdefde3 Linux 4.19.100
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=172185bee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=78c8736935e5597
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16831f66e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+74ab20...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
Read of size 8 at addr ffff8880953face8 by task syz-executor188/30263
CPU: 1 PID: 30263 Comm: syz-executor188 Not tainted 4.19.100-syzkaller #0
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff31e86cd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000408881
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00000000006e59ec R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff31e86d00 R11: 0000000000000293 R12: 00000000006e59e0
R13: 0000000000000000 R14: 000000000000002d R15: 20c49ba5e353f7cf
Allocated by task 30267:
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea0002924f88 ffffea0002536188 ffff88812c31cc40
raw: ffff8880953fa280 ffff8880953fa280 0000000100000002 0000000000000000
ffff8880953fac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880953fac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880953fad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880953fad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
HEAD commit: 7cdefde3 Linux 4.19.100
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=172185bee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=78c8736935e5597
dashboard link: https://syzkaller.appspot.com/bug?extid=74ab2079df15699ca121
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130e90e9e00000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16831f66e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+74ab20...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
CPU: 1 PID: 30263 Comm: syz-executor188 Not tainted 4.19.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
__list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
__list_del_entry include/linux/list.h:117 [inline]
list_del include/linux/list.h:125 [inline]
cma_cancel_listens drivers/infiniband/core/cma.c:1625 [inline]
cma_cancel_operation drivers/infiniband/core/cma.c:1653 [inline]
cma_cancel_operation+0x2d7/0xa10 drivers/infiniband/core/cma.c:1641
rdma_destroy_id+0x8d/0xab0 drivers/infiniband/core/cma.c:1717
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x408881
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
__list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
__list_del_entry include/linux/list.h:117 [inline]
list_del include/linux/list.h:125 [inline]
cma_cancel_listens drivers/infiniband/core/cma.c:1625 [inline]
cma_cancel_operation drivers/infiniband/core/cma.c:1653 [inline]
cma_cancel_operation+0x2d7/0xa10 drivers/infiniband/core/cma.c:1641
rdma_destroy_id+0x8d/0xab0 drivers/infiniband/core/cma.c:1717
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff31e86cd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000408881
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00000000006e59ec R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff31e86d00 R11: 0000000000000293 R12: 00000000006e59e0
R13: 0000000000000000 R14: 000000000000002d R15: 20c49ba5e353f7cf
Allocated by task 30267:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc mm/kasan/kasan.c:553 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
__rdma_create_id+0x5e/0x610 drivers/infiniband/core/cma.c:784
ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506
ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689
__vfs_write+0x114/0x810 fs/read_write.c:485
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0x14f/0x2d0 fs/read_write.c:599
__do_sys_write fs/read_write.c:611 [inline]
__se_sys_write fs/read_write.c:608 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:608
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 30262:
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc mm/kasan/kasan.c:553 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
__rdma_create_id+0x5e/0x610 drivers/infiniband/core/cma.c:784
ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506
ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689
__vfs_write+0x114/0x810 fs/read_write.c:485
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0x14f/0x2d0 fs/read_write.c:599
__do_sys_write fs/read_write.c:611 [inline]
__se_sys_write fs/read_write.c:608 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:608
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3503 [inline]
kfree+0xcf/0x220 mm/slab.c:3822
rdma_destroy_id+0x726/0xab0 drivers/infiniband/core/cma.c:1752
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3503 [inline]
kfree+0xcf/0x220 mm/slab.c:3822
ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880953fab00
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 488 bytes inside of
2048-byte region [ffff8880953fab00, ffff8880953fb300)
The buggy address is located 488 bytes inside of
The buggy address belongs to the page:
page:ffffea000254fe80 count:1 mapcount:0 mapping:ffff88812c31cc40 index:0xffff8880953fa280 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea0002924f88 ffffea0002536188 ffff88812c31cc40
raw: ffff8880953fa280 ffff8880953fa280 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880953fab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
Memory state around the buggy address:
ffff8880953fac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880953fac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880953fad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880953fad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
syzbot
May 1, 2020, 4:25:05 AM5/1/20
to syzkaller...@googlegroups.com
syzbot suspects this bug was fixed by commit:
commit abc4ea7f1345398261295345fd9b30243e4f4f8e
Author: Jason Gunthorpe <j...@mellanox.com>
Date: Tue Feb 18 19:45:38 2020 +0000
RDMA/ucma: Put a lock around every call to the rdma_cm layer
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11bdec4c100000
start commit: 7cdefde3 Linux 4.19.100
git tree: linux-4.19.y
#syz fix: RDMA/ucma: Put a lock around every call to the rdma_cm layer
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit abc4ea7f1345398261295345fd9b30243e4f4f8e
Author: Jason Gunthorpe <j...@mellanox.com>
Date: Tue Feb 18 19:45:38 2020 +0000
RDMA/ucma: Put a lock around every call to the rdma_cm layer
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11bdec4c100000
start commit: 7cdefde3 Linux 4.19.100
git tree: linux-4.19.y
kernel config: https://syzkaller.appspot.com/x/.config?x=78c8736935e5597
dashboard link: https://syzkaller.appspot.com/bug?extid=74ab2079df15699ca121
dashboard link: https://syzkaller.appspot.com/bug?extid=74ab2079df15699ca121
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130e90e9e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16831f66e00000
If the result looks correct, please mark the bug fixed by replying with:
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16831f66e00000
#syz fix: RDMA/ucma: Put a lock around every call to the rdma_cm layer
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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