All of lore.kernel.org
 help / color / mirror / Atom feed
From: syzbot <syzbot+ce39644883793043ee77@syzkaller.appspotmail.com>
To: akpm@linux-foundation.org, christian.brauner@ubuntu.com,
	cxfcosmos@gmail.com, ebiederm@xmission.com, glider@google.com,
	legion@kernel.org, linux-kernel@vger.kernel.org,
	serge@hallyn.com, syzkaller-bugs@googlegroups.com
Subject: [syzbot] KMSAN: uninit-value in make_kuid
Date: Fri, 10 Dec 2021 04:59:26 -0800	[thread overview]
Message-ID: <000000000000f1de5405d2ca4ae2@google.com> (raw)

Hello,

syzbot found the following issue on:

HEAD commit:    b0f85c4ccdd4 kmsan: report: add dump_stack_print_info()
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1704eaf9b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e00a8959fdd3f3e8
dashboard link: https://syzkaller.appspot.com/bug?extid=ce39644883793043ee77
compiler:       clang version 14.0.0 (git@github.com:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

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+ce39644883793043ee77@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in map_id_range_down_base kernel/user_namespace.c:288 [inline]
BUG: KMSAN: uninit-value in map_id_range_down kernel/user_namespace.c:302 [inline]
BUG: KMSAN: uninit-value in map_id_down kernel/user_namespace.c:317 [inline]
BUG: KMSAN: uninit-value in make_kuid+0x450/0xc70 kernel/user_namespace.c:394
 map_id_range_down_base kernel/user_namespace.c:288 [inline]
 map_id_range_down kernel/user_namespace.c:302 [inline]
 map_id_down kernel/user_namespace.c:317 [inline]
 make_kuid+0x450/0xc70 kernel/user_namespace.c:394
 p9pdu_vreadf net/9p/protocol.c:167 [inline]
 p9pdu_readf+0x1378/0x4fc0 net/9p/protocol.c:526
 p9pdu_vreadf net/9p/protocol.c:312 [inline]
 p9pdu_readf+0x1cd0/0x4fc0 net/9p/protocol.c:526
 p9_client_getattr_dotl+0x2de/0x7f0 net/9p/client.c:1768
 v9fs_refresh_inode_dotl+0xb9/0x320 fs/9p/vfs_inode_dotl.c:958
 v9fs_lookup_revalidate+0x33d/0x440 fs/9p/vfs_dentry.c:85
 complete_walk+0x5a0/0x680 fs/namei.c:914
 path_lookupat+0x441/0x8a0 fs/namei.c:2456
 filename_lookup+0x66e/0xa50 fs/namei.c:2480
 user_path_at_empty+0x135/0x430 fs/namei.c:2801
 user_path_at include/linux/namei.h:57 [inline]
 do_mount fs/namespace.c:3328 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x7f9/0xa10 fs/namespace.c:3516
 __ia32_sys_mount+0x157/0x1b0 fs/namespace.c:3516
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 pdu_read net/9p/protocol.c:48 [inline]
 p9pdu_vreadf net/9p/protocol.c:163 [inline]
 p9pdu_readf+0x1288/0x4fc0 net/9p/protocol.c:526
 p9pdu_vreadf net/9p/protocol.c:312 [inline]
 p9pdu_readf+0x1cd0/0x4fc0 net/9p/protocol.c:526
 p9_client_getattr_dotl+0x2de/0x7f0 net/9p/client.c:1768
 v9fs_refresh_inode_dotl+0xb9/0x320 fs/9p/vfs_inode_dotl.c:958
 v9fs_lookup_revalidate+0x33d/0x440 fs/9p/vfs_dentry.c:85
 complete_walk+0x5a0/0x680 fs/namei.c:914
 path_lookupat+0x441/0x8a0 fs/namei.c:2456
 filename_lookup+0x66e/0xa50 fs/namei.c:2480
 user_path_at_empty+0x135/0x430 fs/namei.c:2801
 user_path_at include/linux/namei.h:57 [inline]
 do_mount fs/namespace.c:3328 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x7f9/0xa10 fs/namespace.c:3516
 __ia32_sys_mount+0x157/0x1b0 fs/namespace.c:3516
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 _copy_to_iter+0x1697/0x25c0 lib/iov_iter.c:670
 __copy_page_to_iter lib/iov_iter.c:858 [inline]
 copy_page_to_iter+0x18b7/0x2650 lib/iov_iter.c:883
 pipe_read+0x12ca/0x2380 fs/pipe.c:305
 __kernel_read+0xb34/0x1380 fs/read_write.c:439
 kernel_read+0x278/0x490 fs/read_write.c:457
 p9_fd_read net/9p/trans_fd.c:263 [inline]
 p9_read_work+0x456/0x1bf0 net/9p/trans_fd.c:298
 process_one_work+0xdc2/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10f1/0x2290 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Uninit was stored to memory at:
 _copy_from_iter+0x15eb/0x2520 lib/iov_iter.c:770
 copy_page_from_iter+0x1302/0x1330 lib/iov_iter.c:908
 pipe_write+0x2b9c/0x2dd0 fs/pipe.c:466
 __kernel_write+0xb3e/0x1380 fs/read_write.c:535
 kernel_write+0x47c/0xa50 fs/read_write.c:564
 p9_fd_write net/9p/trans_fd.c:428 [inline]
 p9_write_work+0xa41/0x17a0 net/9p/trans_fd.c:479
 process_one_work+0xdc2/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10f1/0x2290 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Uninit was stored to memory at:
 pdu_write net/9p/protocol.c:57 [inline]
 p9pdu_vwritef+0x3799/0x5120 net/9p/protocol.c:379
 p9pdu_writef+0x23a/0x280 net/9p/protocol.c:539
 p9pdu_vwritef+0x21f0/0x5120 net/9p/protocol.c:490
 p9_client_prepare_req+0x9e3/0x1090 net/9p/client.c:703
 p9_client_rpc+0x276/0x1460 net/9p/client.c:734
 p9_client_setattr+0x115/0x2c0 net/9p/client.c:1894
 v9fs_vfs_setattr_dotl+0x7e2/0xd70 fs/9p/vfs_inode_dotl.c:588
 notify_change+0x1fe3/0x2170 fs/attr.c:410
 chown_common+0x84e/0xca0 fs/open.c:678
 do_fchownat+0x2f8/0x500 fs/open.c:709
 ksys_lchown include/linux/syscalls.h:1335 [inline]
 __do_sys_lchown16 kernel/uid16.c:30 [inline]
 __se_sys_lchown16 kernel/uid16.c:28 [inline]
 __ia32_sys_lchown16+0x200/0x250 kernel/uid16.c:28
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 p9pdu_vwritef+0x3d7f/0x5120 net/9p/protocol.c:378
 p9pdu_writef+0x23a/0x280 net/9p/protocol.c:539
 p9pdu_vwritef+0x21f0/0x5120 net/9p/protocol.c:490
 p9_client_prepare_req+0x9e3/0x1090 net/9p/client.c:703
 p9_client_rpc+0x276/0x1460 net/9p/client.c:734
 p9_client_setattr+0x115/0x2c0 net/9p/client.c:1894
 v9fs_vfs_setattr_dotl+0x7e2/0xd70 fs/9p/vfs_inode_dotl.c:588
 notify_change+0x1fe3/0x2170 fs/attr.c:410
 chown_common+0x84e/0xca0 fs/open.c:678
 do_fchownat+0x2f8/0x500 fs/open.c:709
 ksys_lchown include/linux/syscalls.h:1335 [inline]
 __do_sys_lchown16 kernel/uid16.c:30 [inline]
 __se_sys_lchown16 kernel/uid16.c:28 [inline]
 __ia32_sys_lchown16+0x200/0x250 kernel/uid16.c:28
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 v9fs_vfs_setattr_dotl+0x5c8/0xd70 fs/9p/vfs_inode_dotl.c:567
 notify_change+0x1fe3/0x2170 fs/attr.c:410
 chown_common+0x84e/0xca0 fs/open.c:678
 do_fchownat+0x2f8/0x500 fs/open.c:709
 ksys_lchown include/linux/syscalls.h:1335 [inline]
 __do_sys_lchown16 kernel/uid16.c:30 [inline]
 __se_sys_lchown16 kernel/uid16.c:28 [inline]
 __ia32_sys_lchown16+0x200/0x250 kernel/uid16.c:28
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable newattrs created at:
 chown_common+0x120/0xca0 fs/open.c:647
 do_fchownat+0x2f8/0x500 fs/open.c:709

CPU: 0 PID: 15704 Comm: syz-executor.2 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

             reply	other threads:[~2021-12-10 12:59 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-10 12:59 syzbot [this message]
2021-12-11 10:05 ` [syzbot] KMSAN: uninit-value in make_kuid Christian Brauner

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=000000000000f1de5405d2ca4ae2@google.com \
    --to=syzbot+ce39644883793043ee77@syzkaller.appspotmail.com \
    --cc=akpm@linux-foundation.org \
    --cc=christian.brauner@ubuntu.com \
    --cc=cxfcosmos@gmail.com \
    --cc=ebiederm@xmission.com \
    --cc=glider@google.com \
    --cc=legion@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=serge@hallyn.com \
    --cc=syzkaller-bugs@googlegroups.com \
    /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.