From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, "Amir Goldstein" <amir73il@gmail.com>,
syzbot <syzkaller@googlegroups.com>,
"Mickaël Salaün" <mic@linux.microsoft.com>,
"Vivek Goyal" <vgoyal@redhat.com>,
"Miklos Szeredi" <mszeredi@redhat.com>
Subject: [PATCH 5.11 22/31] ovl: fix leaked dentry
Date: Wed, 5 May 2021 14:06:11 +0200 [thread overview]
Message-ID: <20210505112327.401594800@linuxfoundation.org> (raw)
In-Reply-To: <20210505112326.672439569@linuxfoundation.org>
From: Mickaël Salaün <mic@linux.microsoft.com>
commit eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41 upstream.
Since commit 6815f479ca90 ("ovl: use only uppermetacopy state in
ovl_lookup()"), overlayfs doesn't put temporary dentry when there is a
metacopy error, which leads to dentry leaks when shutting down the related
superblock:
overlayfs: refusing to follow metacopy origin for (/file0)
...
BUG: Dentry (____ptrval____){i=3f33,n=file3} still in use (1) [unmount of overlay overlay]
...
WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d
CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1
...
RIP: 0010:umount_check.cold+0x107/0x14d
...
Call Trace:
d_walk+0x28c/0x950
? dentry_lru_isolate+0x2b0/0x2b0
? __kasan_slab_free+0x12/0x20
do_one_tree+0x33/0x60
shrink_dcache_for_umount+0x78/0x1d0
generic_shutdown_super+0x70/0x440
kill_anon_super+0x3e/0x70
deactivate_locked_super+0xc4/0x160
deactivate_super+0xfa/0x140
cleanup_mnt+0x22e/0x370
__cleanup_mnt+0x1a/0x30
task_work_run+0x139/0x210
do_exit+0xb0c/0x2820
? __kasan_check_read+0x1d/0x30
? find_held_lock+0x35/0x160
? lock_release+0x1b6/0x660
? mm_update_next_owner+0xa20/0xa20
? reacquire_held_locks+0x3f0/0x3f0
? __sanitizer_cov_trace_const_cmp4+0x22/0x30
do_group_exit+0x135/0x380
__do_sys_exit_group.isra.0+0x20/0x20
__x64_sys_exit_group+0x3c/0x50
do_syscall_64+0x45/0x70
entry_SYSCALL_64_after_hwframe+0x44/0xae
...
VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day...
This fix has been tested with a syzkaller reproducer.
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: <stable@vger.kernel.org> # v5.8+
Reported-by: syzbot <syzkaller@googlegroups.com>
Fixes: 6815f479ca90 ("ovl: use only uppermetacopy state in ovl_lookup()")
Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
Link: https://lore.kernel.org/r/20210329164907.2133175-1-mic@digikod.net
Reviewed-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/overlayfs/namei.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -919,6 +919,7 @@ struct dentry *ovl_lookup(struct inode *
continue;
if ((uppermetacopy || d.metacopy) && !ofs->config.metacopy) {
+ dput(this);
err = -EPERM;
pr_warn_ratelimited("refusing to follow metacopy origin for (%pd2)\n", dentry);
goto out_put;
next prev parent reply other threads:[~2021-05-05 12:14 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-05 12:05 [PATCH 5.11 00/31] 5.11.19-rc1 review Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 01/31] mips: Do not include hi and lo in clobber list for R6 Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 02/31] netfilter: conntrack: Make global sysctls readonly in non-init netns Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 03/31] net: usb: ax88179_178a: initialize local variables before use Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 04/31] drm/i915: Disable runtime power management during shutdown Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 05/31] igb: Enable RSS for Intel I211 Ethernet Controller Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 06/31] bpf: Fix masking negation logic upon negative dst register Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 07/31] bpf: Fix leakage of uninitialized bpf stack under speculation Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 08/31] net: qrtr: Avoid potential use after free in MHI send Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 09/31] perf data: Fix error return code in perf_data__create_dir() Greg Kroah-Hartman
2021-05-05 12:05 ` [PATCH 5.11 10/31] capabilities: require CAP_SETFCAP to map uid 0 Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 11/31] perf ftrace: Fix access to pid in array when setting a pid filter Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 12/31] tools/cgroup/slabinfo.py: updated to work on current kernel Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 13/31] driver core: add a min_align_mask field to struct device_dma_parameters Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 14/31] swiotlb: add a IO_TLB_SIZE define Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 15/31] swiotlb: factor out an io_tlb_offset helper Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 16/31] swiotlb: factor out a nr_slots helper Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 17/31] swiotlb: clean up swiotlb_tbl_unmap_single Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 18/31] swiotlb: refactor swiotlb_tbl_map_single Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 19/31] swiotlb: dont modify orig_addr in swiotlb_tbl_sync_single Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 20/31] swiotlb: respect min_align_mask Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 21/31] nvme-pci: set min_align_mask Greg Kroah-Hartman
2021-05-05 12:06 ` Greg Kroah-Hartman [this message]
2021-05-05 12:06 ` [PATCH 5.11 23/31] ovl: allow upperdir inside lowerdir Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 24/31] ALSA: usb-audio: Add MIDI quirk for Vox ToneLab EX Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 25/31] ALSA: usb-audio: Fix implicit sync clearance at stopping stream Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 26/31] USB: Add LPM quirk for Lenovo ThinkPad USB-C Dock Gen2 Ethernet Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 27/31] USB: Add reset-resume quirk for WD19s Realtek Hub Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 28/31] ASoC: ak4458: Add MODULE_DEVICE_TABLE Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 29/31] ASoC: ak5558: " Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 30/31] platform/x86: thinkpad_acpi: Correct thermal sensor allocation Greg Kroah-Hartman
2021-05-05 12:06 ` [PATCH 5.11 31/31] perf/core: Fix unconditional security_locked_down() call Greg Kroah-Hartman
2021-05-05 15:22 ` [PATCH 5.11 00/31] 5.11.19-rc1 review Fox Chen
2021-05-05 21:04 ` Shuah Khan
2021-05-06 1:52 ` Guenter Roeck
2021-05-06 7:14 ` Naresh Kamboju
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=20210505112327.401594800@linuxfoundation.org \
--to=gregkh@linuxfoundation.org \
--cc=amir73il@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mic@linux.microsoft.com \
--cc=mszeredi@redhat.com \
--cc=stable@vger.kernel.org \
--cc=syzkaller@googlegroups.com \
--cc=vgoyal@redhat.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).