syzbot


KASAN: stack-out-of-bounds Read in rdma_bind_addr (2)

Status: closed as dup on 2018/04/04 06:24
Subsystems: rdma
[Documentation on labels]
Reported-by: syzbot+4b6afe4bdd99cb99e664@syzkaller.appspotmail.com
First crash: 2273d, last: 2273d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
kernel BUG at lib/string.c:LINE! (3) rdma C 5 2273d 2274d
Discussions (1)
Title Replies (including bot) Last reply
KASAN: stack-out-of-bounds Read in rdma_bind_addr (2) 1 (2) 2018/04/04 06:24
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: stack-out-of-bounds Read in rdma_bind_addr rdma C 10 2279d 2293d 0/27 closed as dup on 2018/03/22 15:26

Sample crash report:
==================================================================
BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: stack-out-of-bounds in rdma_bind_addr+0x13b/0x1d60 drivers/infiniband/core/cma.c:3361
Read of size 48 at addr ffff8801af717a50 by task syzkaller366236/4421

CPU: 0 PID: 4421 Comm: syzkaller366236 Not tainted 4.16.0-rc7+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 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
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:345 [inline]
 rdma_bind_addr+0x13b/0x1d60 drivers/infiniband/core/cma.c:3361
 ucma_bind_ip+0x10a/0x190 drivers/infiniband/core/ucma.c:639
 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649
 __vfs_write+0xef/0x970 fs/read_write.c:480
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x43fdd9
RSP: 002b:00007ffc69ab4bb8 EFLAGS: 00000217 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdd9
RDX: 0000000000000090 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401700
R13: 0000000000401790 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0006bdc5c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0006bd0101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801af717900: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2
 ffff8801af717980: f2 f2 f2 f2 f2 f2 04 f2 f2 f2 f3 f3 f3 f3 00 00
>ffff8801af717a00: 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2
                                                             ^
 ffff8801af717a80: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
 ffff8801af717b00: f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/03/29 21:26 upstream 0b412605ef5f d47f0ed6 .config console log report syz C ci-upstream-kasan-gce-root
2018/03/29 20:47 upstream 0b412605ef5f d47f0ed6 .config console log report syz C ci-upstream-kasan-gce
2018/03/29 21:37 upstream 0b412605ef5f d47f0ed6 .config console log report syz ci-upstream-kasan-gce-386
2018/03/29 20:27 upstream 0b412605ef5f d47f0ed6 .config console log report ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.