Patch "[PATCH 4.4 07/16] fs: Check for invalid i_uid in may_follow_link()" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    [PATCH 4.4 07/16] fs: Check for invalid i_uid in may_follow_link()

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-check-for-invalid-i_uid-in-may_follow_link.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From stable-owner@vger.kernel.org Tue Aug 30 06:36:53 2016
From: "Levin, Alexander" <alexander.levin@verizon.com>
Date: Tue, 30 Aug 2016 00:35:00 -0400
Subject: [PATCH 4.4 07/16] fs: Check for invalid i_uid in may_follow_link()
To: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Cc: "stable@vger.kernel.org" <stable@vger.kernel.org>
Message-ID: <1472531709-18002-8-git-send-email-alexander.levin@verizon.com>


From: Seth Forshee <seth.forshee@canonical.com>

[ Upstream commit 2d7f9e2ad35e4e7a3086231f19bfab33c6a8a64a ]

Filesystem uids which don't map into a user namespace may result
in inode->i_uid being INVALID_UID. A symlink and its parent
could have different owners in the filesystem can both get
mapped to INVALID_UID, which may result in following a symlink
when this would not have otherwise been permitted when protected
symlinks are enabled.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/namei.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/namei.c
+++ b/fs/namei.c
@@ -887,6 +887,7 @@ static inline int may_follow_link(struct
 {
 	const struct inode *inode;
 	const struct inode *parent;
+	kuid_t puid;
 
 	if (!sysctl_protected_symlinks)
 		return 0;
@@ -902,7 +903,8 @@ static inline int may_follow_link(struct
 		return 0;
 
 	/* Allowed if parent directory and link owner match. */
-	if (uid_eq(parent->i_uid, inode->i_uid))
+	puid = parent->i_uid;
+	if (uid_valid(puid) && uid_eq(puid, inode->i_uid))
 		return 0;
 
 	if (nd->flags & LOOKUP_RCU)


Patches currently in stable-queue which might be from alexander.levin@verizon.com are

queue-4.4/0065-megaraid_sas-Add-an-i-o-barrier.patch
queue-4.4/0110-ntp-Fix-ADJ_SETOFFSET-being-used-w-ADJ_NANO.patch
queue-4.4/0070-arm64-KVM-Configure-TCR_EL2.PS-at-runtime.patch
queue-4.4/0004-i40e-fix-do-not-sleep-in-netdev_ops.patch
queue-4.4/0125-tda10071-Fix-dependency-to-REGMAP_I2C.patch
queue-4.4/0009-i40e-clean-whole-mac-filter-list.patch
queue-4.4/cxlflash-fix-to-avoid-virtual-lun-failover-failure.patch
queue-4.4/0078-drm-atomic-Do-not-unset-crtc-when-an-encoder-is-stol.patch
queue-4.4/0017-clk-xgene-Fix-divider-with-non-zero-shift-value.patch
queue-4.4/0104-perf-x86-cqm-Fix-CQM-handling-of-grouping-events-int.patch
queue-4.4/0042-cxl-Fix-possible-idr-warning-when-contexts-are-relea.patch
queue-4.4/0131-drm-i915-Check-VBT-for-port-presence-in-addition-to-.patch
queue-4.4/0032-lightnvm-fix-missing-grown-bad-block-type.patch
queue-4.4/0076-drm-i915-bxt-update-list-of-PCIIDs.patch
queue-4.4/0071-net-cavium-liquidio-fix-check-for-in-progress-flag.patch
queue-4.4/0056-lpfc-Fix-mbox-reuse-in-PLOGI-completion.patch
queue-4.4/0090-UVC-Add-support-for-R200-depth-camera.patch
queue-4.4/0066-pwm-fsl-ftm-Fix-clock-enable-disable-when-using-PM.patch
queue-4.4/0013-igb-fix-NULL-derefs-due-to-skipped-SR-IOV-enabling.patch
queue-4.4/keys-fix-asn.1-indefinite-length-object-parsing.patch
queue-4.4/0107-net-thunderx-Fix-receive-packet-stats.patch
queue-4.4/0008-i40evf-check-rings-before-freeing-resources.patch
queue-4.4/0036-tools-hv-report-ENOSPC-errors-in-hv_fcopy_daemon.patch
queue-4.4/0093-net-mlx5e-Don-t-modify-CQ-before-it-was-created.patch
queue-4.4/0038-drivers-hv-cleanup-synic-msrs-if-vmbus-connect-faile.patch
queue-4.4/0083-net-thunderx-Fix-for-Qset-error-due-to-CQ-full.patch
queue-4.4/0133-netfilter-x_tables-check-for-size-overflow.patch
queue-4.4/0007-i40e-don-t-add-zero-MAC-filter.patch
queue-4.4/0030-lightnvm-unlock-rq-and-free-ppa_list-on-submission-f.patch
queue-4.4/0120-block-fix-blk_rq_get_max_sectors-for-driver-private-.patch
queue-4.4/0052-lpfc-Fix-driver-crash-when-module-parameter-lpfc_fcp.patch
queue-4.4/0034-Drivers-hv-util-Increase-the-timeout-for-util-servic.patch
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queue-4.4/0010-i40e-Fix-Rx-hash-reported-to-the-stack-by-our-driver.patch
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queue-4.4/0109-time-Verify-time-values-in-adjtimex-ADJ_SETOFFSET-to.patch
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queue-4.4/cxlflash-fix-to-escalate-link_reset-also-on-port-1.patch
queue-4.4/0040-Drivers-hv-vmbus-serialize-process_chn_event-and-vmb.patch
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