netdev - KASAN: vmalloc-out-of-bounds Read in bpf_trace

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Message-ID: <000000000000b782e305b3b7d9f6@google.com>
Date:   Mon, 09 Nov 2020 18:58:16 -0800
From:   syzbot <syzbot+3cab841567b697b80981@...kaller.appspotmail.com>
To:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, hawk@...nel.org,
        john.fastabend@...il.com, kafai@...com, kpsingh@...omium.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com,
        netdev@...r.kernel.org, rostedt@...dmis.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yhs@...com
Subject: KASAN: vmalloc-out-of-bounds Read in bpf_trace_run1

Hello,

syzbot found the following issue on:

HEAD commit:    4e0396c5 net: marvell: prestera: fix compilation with CONF..
git tree:       bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=11697b82500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=61033507391c77ff
dashboard link: https://syzkaller.appspot.com/bug?extid=3cab841567b697b80981
compiler:       gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3cab841567b697b80981@...kaller.appspotmail.com

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in __bpf_trace_run kernel/trace/bpf_trace.c:2045 [inline]
BUG: KASAN: vmalloc-out-of-bounds in bpf_trace_run1+0x3b0/0x3c0 kernel/trace/bpf_trace.c:2081
Read of size 8 at addr ffffc900019c3030 by task syz-executor.2/3268

CPU: 0 PID: 3268 Comm: syz-executor.2 Not tainted 5.10.0-rc2-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+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x4c8 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
 __bpf_trace_run kernel/trace/bpf_trace.c:2045 [inline]
 bpf_trace_run1+0x3b0/0x3c0 kernel/trace/bpf_trace.c:2081
 __bpf_trace_block_plug+0x8b/0xc0 block/blk-core.c:716
 trace_block_plug+0x138/0x280 include/trace/events/block.h:470
 blk_mq_submit_bio+0xcf2/0x1770 block/blk-mq.c:2219
 __submit_bio_noacct_mq block/blk-core.c:1026 [inline]
 submit_bio_noacct+0xa27/0xe30 block/blk-core.c:1059
 submit_bio+0x263/0x5b0 block/blk-core.c:1129
 iomap_dio_submit_bio+0x293/0x360 fs/iomap/direct-io.c:76
 iomap_dio_bio_actor+0x4b3/0xf00 fs/iomap/direct-io.c:312
 iomap_dio_actor+0x89/0x550 fs/iomap/direct-io.c:389
 iomap_apply+0x2a3/0xb50 fs/iomap/apply.c:84
 __iomap_dio_rw+0x6cd/0x1220 fs/iomap/direct-io.c:517
 iomap_dio_rw+0x31/0x90 fs/iomap/direct-io.c:605
 ext4_dio_write_iter fs/ext4/file.c:552 [inline]
 ext4_file_write_iter+0xddc/0x1400 fs/ext4/file.c:662
 call_write_iter include/linux/fs.h:1887 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x57d/0x700 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fab24ef9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000003ac00 RCX: 000000000045deb9
RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffdb0e8a67f R14: 00007fab24efa9c0 R15: 000000000118bf2c


Memory state around the buggy address:
 ffffc900019c2f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900019c2f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc900019c3000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                                     ^
 ffffc900019c3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900019c3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================


---
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