From: syzbot <syzbot+0849c524d9c634f5ae66@syzkaller.appspotmail.com>
To: davem@davemloft.net, glider@google.com, isdn@linux-pingi.de,
keescook@chromium.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, rdunlap@infradead.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: KMSAN: uninit-value in capi_write
Date: Mon, 11 Feb 2019 14:03:04 -0800 [thread overview]
Message-ID: <0000000000000e35f00581a579cd@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 11587f6ee534 kmsan: remove pr_err
git tree: kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=120bd84f400000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8a62a4eb8ea3e9f
dashboard link: https://syzkaller.appspot.com/bug?extid=0849c524d9c634f5ae66
compiler: clang version 8.0.0 (trunk 350161)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c53cd3400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e2794b400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0849c524d9c634f5ae66@syzkaller.appspotmail.com
==================================================================
BUG: KMSAN: uninit-value in capi_write+0x791/0xa90
drivers/isdn/capi/capi.c:700
CPU: 0 PID: 10025 Comm: syz-executor379 Not tainted 4.20.0-rc7+ #2
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+0x173/0x1d0 lib/dump_stack.c:113
kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613
__msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
capi_write+0x791/0xa90 drivers/isdn/capi/capi.c:700
do_loop_readv_writev fs/read_write.c:703 [inline]
do_iter_write+0x83e/0xd80 fs/read_write.c:961
vfs_writev fs/read_write.c:1004 [inline]
do_writev+0x397/0x840 fs/read_write.c:1039
__do_sys_writev fs/read_write.c:1112 [inline]
__se_sys_writev+0x9b/0xb0 fs/read_write.c:1109
__x64_sys_writev+0x4a/0x70 fs/read_write.c:1109
do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x440079
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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd84911358 EFLAGS: 00000207 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440079
RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401900
R13: 0000000000401990 R14: 0000000000000000 R15: 0000000000000000
Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline]
kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158
kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
slab_post_alloc_hook mm/slab.h:446 [inline]
slab_alloc_node mm/slub.c:2759 [inline]
__kmalloc_node_track_caller+0xe18/0x1030 mm/slub.c:4383
__kmalloc_reserve net/core/skbuff.c:137 [inline]
__alloc_skb+0x309/0xa20 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:998 [inline]
capi_write+0x12f/0xa90 drivers/isdn/capi/capi.c:691
do_loop_readv_writev fs/read_write.c:703 [inline]
do_iter_write+0x83e/0xd80 fs/read_write.c:961
vfs_writev fs/read_write.c:1004 [inline]
do_writev+0x397/0x840 fs/read_write.c:1039
__do_sys_writev fs/read_write.c:1112 [inline]
__se_sys_writev+0x9b/0xb0 fs/read_write.c:1109
__x64_sys_writev+0x4a/0x70 fs/read_write.c:1109
do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
next reply other threads:[~2019-02-11 22:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 22:03 syzbot [this message]
2019-09-01 14:32 ` [PATCH net] isdn/capi: check message length in capi_write() Eric Biggers
2019-09-01 18:44 ` David Miller
2019-09-06 2:36 ` [PATCH net v2] " Eric Biggers
2019-09-07 15:47 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0000000000000e35f00581a579cd@google.com \
--to=syzbot+0849c524d9c634f5ae66@syzkaller.appspotmail.com \
--cc=davem@davemloft.net \
--cc=glider@google.com \
--cc=isdn@linux-pingi.de \
--cc=keescook@chromium.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=rdunlap@infradead.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.