Messages in this thread | | | Date | Wed, 13 Jun 2018 00:51:02 -0700 | Subject | KASAN: out-of-bounds Read in rds_cong_queue_updates (2) | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 0adb32858b0b Linux 4.16 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=138f2d0b800000 kernel config: https://syzkaller.appspot.com/x/.config?x=df0c336cc3b55d45 dashboard link: https://syzkaller.appspot.com/bug?extid=287843ad8a4d2870e538 compiler: gcc (GCC) 7.1.1 20170620
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+287843ad8a4d2870e538@syzkaller.appspotmail.com
================================================================== BUG: KASAN: out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: out-of-bounds in atomic_read arch/x86/include/asm/atomic.h:27 [inline] BUG: KASAN: out-of-bounds in refcount_read include/linux/refcount.h:42 [inline] BUG: KASAN: out-of-bounds in check_net include/net/net_namespace.h:228 [inline] BUG: KASAN: out-of-bounds in rds_destroy_pending net/rds/rds.h:868 [inline] BUG: KASAN: out-of-bounds in rds_cong_queue_updates+0x4d3/0x4f0 net/rds/cong.c:226 Read of size 4 at addr ffff88018d7f2204 by task kworker/u4:6/10561
CPU: 1 PID: 10561 Comm: kworker/u4:6 Not tainted 4.16.0+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 kernel msg: ebtables bug: please report to author: Wrong len argument print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 __read_once_size include/linux/compiler.h:188 [inline] atomic_read arch/x86/include/asm/atomic.h:27 [inline] refcount_read include/linux/refcount.h:42 [inline] check_net include/net/net_namespace.h:228 [inline] rds_destroy_pending net/rds/rds.h:868 [inline] rds_cong_queue_updates+0x4d3/0x4f0 net/rds/cong.c:226 rds_recv_rcvbuf_delta.part.2+0x289/0x320 net/rds/recv.c:118 rds_recv_rcvbuf_delta net/rds/recv.c:377 [inline] rds_recv_incoming+0xeb4/0x11d0 net/rds/recv.c:377 rds_loop_xmit+0x149/0x320 net/rds/loop.c:82 rds_send_xmit+0xbcd/0x26b0 net/rds/send.c:355 rds_send_worker+0x115/0x2a0 net/rds/threads.c:199 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
The buggy address belongs to the page: page:ffffea000635fc80 count:3 mapcount:2 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 0000000300000001 raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff88018d7f2100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88018d7f2180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88018d7f2200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88018d7f2280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88018d7f2300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 10561 Comm: kworker/u4:6 Tainted: G B 4.16.0+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 kasan_end_report+0x50/0x50 mm/kasan/report.c:180 kasan_report_error mm/kasan/report.c:359 [inline] kasan_report+0x149/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 __read_once_size include/linux/compiler.h:188 [inline] atomic_read arch/x86/include/asm/atomic.h:27 [inline] refcount_read include/linux/refcount.h:42 [inline] check_net include/net/net_namespace.h:228 [inline] rds_destroy_pending net/rds/rds.h:868 [inline] rds_cong_queue_updates+0x4d3/0x4f0 net/rds/cong.c:226 rds_recv_rcvbuf_delta.part.2+0x289/0x320 net/rds/recv.c:118 rds_recv_rcvbuf_delta net/rds/recv.c:377 [inline] rds_recv_incoming+0xeb4/0x11d0 net/rds/recv.c:377 rds_loop_xmit+0x149/0x320 net/rds/loop.c:82 rds_send_xmit+0xbcd/0x26b0 net/rds/send.c:355 rds_send_worker+0x115/0x2a0 net/rds/threads.c:199 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..
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