syzbot


KASAN: null-ptr-deref Write in xdp_umem_unaccount_pages

Status: fixed on 2018/07/09 18:05
Subsystems: bpf net
[Documentation on labels]
Reported-by: syzbot+979217770b09ebf5c407@syzkaller.appspotmail.com
Fix commit: c09290c56376 bpf, xdp: fix crash in xdp_umem_unaccount_pages
First crash: 2180d, last: 2176d
Discussions (2)
Title Replies (including bot) Last reply
KASAN: null-ptr-deref Write in xdp_umem_unaccount_pages 1 (2) 2018/06/08 09:50
[PATCH bpf] bpf, xdp: fix crash in xdp_umem_unaccount_pages 2 (2) 2018/06/07 22:35

Sample crash report:
RDX: 0000000000000004 RSI: 000000000000011b RDI: 0000000000000004
RBP: 00000000006cb018 R08: 0000000000000018 R09: 00007fffc4750032
R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000005
R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: null-ptr-deref in atomic64_sub include/asm-generic/atomic-instrumented.h:144 [inline]
BUG: KASAN: null-ptr-deref in atomic_long_sub include/asm-generic/atomic-long.h:199 [inline]
BUG: KASAN: null-ptr-deref in xdp_umem_unaccount_pages.isra.4+0x3d/0x80 net/xdp/xdp_umem.c:135
Write of size 8 at addr 0000000000000060 by task syz-executor246/4527

CPU: 1 PID: 4527 Comm: syz-executor246 Not tainted 4.17.0+ #89
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+0x1b9/0x294 lib/dump_stack.c:113
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report.cold.7+0x6d/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
 atomic64_sub include/asm-generic/atomic-instrumented.h:144 [inline]
 atomic_long_sub include/asm-generic/atomic-long.h:199 [inline]
 xdp_umem_unaccount_pages.isra.4+0x3d/0x80 net/xdp/xdp_umem.c:135
 xdp_umem_reg net/xdp/xdp_umem.c:334 [inline]
 xdp_umem_create+0xd6c/0x10f0 net/xdp/xdp_umem.c:349
 xsk_setsockopt+0x443/0x550 net/xdp/xsk.c:531
 __sys_setsockopt+0x1bd/0x390 net/socket.c:1935
 __do_sys_setsockopt net/socket.c:1946 [inline]
 __se_sys_setsockopt net/socket.c:1943 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1943
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440549
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fffc475d008 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440549
RDX: 0000000000000004 RSI: 000000000000011b RDI: 0000000000000004
RBP: 00000000006cb018 R08: 0000000000000018 R09: 00007fffc4750032
R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000005
R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
==================================================================

Crashes (25):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/06/07 18:05 upstream 1c8c5a9d38f6 645e75f8 .config console log report syz C ci-upstream-kasan-gce-root
2018/06/11 07:31 upstream 1aaccb5fa0ea 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/11 07:03 upstream 1aaccb5fa0ea 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/11 00:19 upstream 3ca24ce9ff76 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 21:51 upstream 3ca24ce9ff76 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 20:55 upstream 3ca24ce9ff76 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 19:02 upstream 3ca24ce9ff76 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 17:27 upstream 3ca24ce9ff76 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 05:18 upstream a16afaf7928b 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 04:44 upstream a16afaf7928b 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 04:32 upstream a16afaf7928b 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/10 04:24 upstream a16afaf7928b 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/09 23:56 upstream a16afaf7928b 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/09 20:53 upstream 7d3bf613e99a 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/09 18:46 upstream 7d3bf613e99a 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/09 17:10 upstream 7d3bf613e99a 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/09 03:38 upstream 410feb75de24 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/08 23:50 upstream 410feb75de24 866118af .config console log report ci-upstream-kasan-gce-root
2018/06/08 18:48 upstream 68abbe729567 83f945db .config console log report ci-upstream-kasan-gce-root
2018/06/08 13:59 upstream 68abbe729567 f7b27b7a .config console log report ci-upstream-kasan-gce-root
2018/06/08 08:16 upstream 68abbe729567 f7b27b7a .config console log report ci-upstream-kasan-gce-root
2018/06/07 23:38 upstream 1c8c5a9d38f6 645e75f8 .config console log report ci-upstream-kasan-gce-root
2018/06/07 19:44 upstream 1c8c5a9d38f6 645e75f8 .config console log report ci-upstream-kasan-gce-root
2018/06/07 14:54 upstream 1c8c5a9d38f6 645e75f8 .config console log report ci-upstream-kasan-gce-root
2018/06/07 14:32 upstream 1c8c5a9d38f6 645e75f8 .config console log report ci-upstream-kasan-gce-root
* Struck through repros no longer work on HEAD.