syzbot


KASAN: stack-out-of-bounds Read in rdma_resolve_addr

Status: closed as dup on 2018/07/04 20:07
Reported-by: syzbot+ed69cab241b56b3ecaf9@syzkaller.appspotmail.com
First crash: 1797d, last: 1776d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: null-ptr-deref Write in rdma_resolve_addr C 66 1784d 1795d

Sample crash report:
audit: type=1400 audit(1520534455.052:6): avc:  denied  { map } for  pid=4222 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1520534461.379:7): avc:  denied  { map } for  pid=4236 comm="syzkaller709666" path="/root/syzkaller709666647" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: stack-out-of-bounds in rdma_resolve_addr+0x12e/0x26c0 drivers/infiniband/core/cma.c:2920
Read of size 48 at addr ffff8801af5b7a44 by task syzkaller709666/4236

CPU: 0 PID: 4236 Comm: syzkaller709666 Not tainted 4.16.0-rc4+ #346
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_resolve_addr+0x12e/0x26c0 drivers/infiniband/core/cma.c:2920
 ucma_resolve_ip+0x142/0x1f0 drivers/infiniband/core/ucma.c:677
 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1627
 __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: 0033:0x43fe49
RSP: 002b:00007fffc4577208 EFLAGS: 00000217 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe49
RDX: 0000000000000048 RSI: 0000000020000740 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401770
R13: 0000000000401800 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0006bd6dc0 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:
 ffff8801af5b7900: f2 f2 f2 f2 f2 f2 00 00 f2 f2 f2 f2 f2 f2 00 00
 ffff8801af5b7980: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801af5b7a00: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 f3 f3 f3
                                                          ^
 ffff8801af5b7a80: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
 ffff8801af5b7b00: f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00
==================================================================

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce 2018/03/08 18:43 upstream 1b88accf6a65 acd0caa5 .config console log report syz C
ci-upstream-kasan-gce-386 2018/03/08 18:35 upstream 1b88accf6a65 acd0caa5 .config console log report syz
ci-upstream-kasan-gce 2018/03/29 18:21 upstream 0b412605ef5f d47f0ed6 .config console log report
* Struck through repros no longer work on HEAD.