From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
"Eric W. Biederman" <ebiederm@xmission.com>,
Miklos Szeredi <mszeredi@redhat.com>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 23/57] ovl: perform vfs_getxattr() with mounter creds
Date: Mon, 22 Feb 2021 13:35:49 +0100 [thread overview]
Message-ID: <20210222121028.970490521@linuxfoundation.org> (raw)
In-Reply-To: <20210222121027.174911182@linuxfoundation.org>
From: Miklos Szeredi <mszeredi@redhat.com>
[ Upstream commit 554677b97257b0b69378bd74e521edb7e94769ff ]
The vfs_getxattr() in ovl_xattr_set() is used to check whether an xattr
exist on a lower layer file that is to be removed. If the xattr does not
exist, then no need to copy up the file.
This call of vfs_getxattr() wasn't wrapped in credential override, and this
is probably okay. But for consitency wrap this instance as well.
Reported-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/overlayfs/inode.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 30a1c7fc8c75c..ac6efac119fb9 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -216,7 +216,9 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
goto out;
if (!value && !upperdentry) {
+ old_cred = ovl_override_creds(dentry->d_sb);
err = vfs_getxattr(realdentry, name, NULL, 0);
+ revert_creds(old_cred);
if (err < 0)
goto out_drop_write;
}
--
2.27.0
next prev parent reply other threads:[~2021-02-22 13:09 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 12:35 [PATCH 4.14 00/57] 4.14.222-rc1 review Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 01/57] fgraph: Initialize tracing_graph_pause at task creation Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 02/57] remoteproc: qcom_q6v5_mss: Validate modem blob firmware size before load Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 03/57] remoteproc: qcom_q6v5_mss: Validate MBA " Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 04/57] af_key: relax availability checks for skb size calculation Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 05/57] pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process() Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 06/57] iwlwifi: mvm: take mutex for calling iwl_mvm_get_sync_time() Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 07/57] iwlwifi: pcie: add a NULL check in iwl_pcie_txq_unmap Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 08/57] iwlwifi: mvm: guard against device removal in reprobe Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 09/57] SUNRPC: Move simple_get_bytes and simple_get_netobj into private header Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 10/57] SUNRPC: Handle 0 length opaque XDR object data properly Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 11/57] lib/string: Add strscpy_pad() function Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 12/57] include/trace/events/writeback.h: fix -Wstringop-truncation warnings Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 13/57] memcg: fix a crash in wb_workfn when a device disappears Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 14/57] squashfs: add more sanity checks in id lookup Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 15/57] squashfs: add more sanity checks in inode lookup Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 16/57] squashfs: add more sanity checks in xattr id lookup Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 17/57] tracing: Do not count ftrace events in top level enable output Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 18/57] tracing: Check length before giving out the filter buffer Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 19/57] arm/xen: Dont probe xenbus as part of an early initcall Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 20/57] MIPS: BMIPS: Fix section mismatch warning Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 21/57] arm64: dts: rockchip: Fix PCIe DT properties on rk3399 Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 22/57] platform/x86: hp-wmi: Disable tablet-mode reporting by default Greg Kroah-Hartman
2021-02-22 12:35 ` Greg Kroah-Hartman [this message]
2021-02-22 12:35 ` [PATCH 4.14 24/57] cap: fix conversions on getxattr Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 25/57] ovl: skip getxattr of security labels Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 26/57] ARM: dts: lpc32xx: Revert set default clock rate of HCLK PLL Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 27/57] ARM: ensure the signal page contains defined contents Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 28/57] memblock: do not start bottom-up allocations with kernel_end Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 29/57] bpf: Check for integer overflow when using roundup_pow_of_two() Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 30/57] netfilter: xt_recent: Fix attempt to update deleted entry Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 31/57] xen/netback: avoid race in xenvif_rx_ring_slots_available() Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 32/57] netfilter: conntrack: skip identical origin tuple in same zone only Greg Kroah-Hartman
2021-02-22 12:35 ` [PATCH 4.14 33/57] usb: dwc3: ulpi: fix checkpatch warning Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 34/57] usb: dwc3: ulpi: Replace CPU-based busyloop with Protocol-based one Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 35/57] net/vmw_vsock: improve locking in vsock_connect_timeout() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 36/57] net: watchdog: hold device global xmit lock during tx disable Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 37/57] vsock/virtio: update credit only if socket is not closed Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 38/57] vsock: fix locking in vsock_shutdown() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 39/57] i2c: stm32f7: fix configuration of the digital filter Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 40/57] h8300: fix PREEMPTION build, TI_PRE_COUNT undefined Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 41/57] x86/build: Disable CET instrumentation in the kernel for 32-bit too Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 42/57] trace: Use -mcount-record for dynamic ftrace Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 43/57] tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 44/57] tracing: Avoid calling cc-option -mrecord-mcount for every Makefile Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 45/57] Xen/x86: dont bail early from clear_foreign_p2m_mapping() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 46/57] Xen/x86: also check kernel mapping in set_foreign_p2m_mapping() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 47/57] Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 48/57] Xen/gntdev: correct error checking " Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 49/57] xen/arm: dont ignore return errors from set_phys_to_machine Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 50/57] xen-blkback: dont "handle" error by BUG() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 51/57] xen-netback: " Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 52/57] xen-scsiback: " Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 53/57] xen-blkback: fix error handling in xen_blkbk_map() Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 54/57] scsi: qla2xxx: Fix crash during driver load on big endian machines Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 55/57] USB: Gadget Ethernet: Re-enable Jumbo frames Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 56/57] usb: gadget: u_ether: Fix MTU size mismatch with RX packet size Greg Kroah-Hartman
2021-02-22 12:36 ` [PATCH 4.14 57/57] kvm: check tlbs_dirty directly Greg Kroah-Hartman
2021-02-22 21:27 ` [PATCH 4.14 00/57] 4.14.222-rc1 review Guenter Roeck
2021-02-23 11:53 ` Naresh Kamboju
2021-02-23 13:47 ` Jon Hunter
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