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From 823f270e138d1f752f1acf4827847eab97b07a87 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Tue, 4 Jan 2022 10:54:20 +0100
Subject: [PATCH 2/2] libmount: fix (deleted) suffix issue [CVE-2021-3996]
This issue is related to parsing the /proc/self/mountinfo file allows an
unprivileged user to unmount other user's filesystems that are either
world-writable themselves or mounted in a world-writable directory.
The support for "(deleted)" is no more necessary as the Linux kernel does
not use it in /proc/self/mountinfo and /proc/self/mount files anymore.
Signed-off-by: Karel Zak <kzak@redhat.com>
---
libmount/src/tab_parse.c | 5 -----
tests/expected/findmnt/filter-options | 1 -
tests/expected/findmnt/filter-options-nameval-neg | 3 +--
tests/expected/findmnt/filter-types-neg | 1 -
tests/expected/findmnt/outputs-default | 3 +--
tests/expected/findmnt/outputs-force-tree | 3 +--
tests/expected/findmnt/outputs-kernel | 3 +--
tests/expected/libmount/tabdiff-mount | 1 -
tests/expected/libmount/tabdiff-move | 1 -
tests/expected/libmount/tabdiff-remount | 1 -
tests/expected/libmount/tabdiff-umount | 1 -
tests/expected/libmount/tabfiles-parse-mountinfo | 11 -----------
tests/expected/libmount/tabfiles-py-parse-mountinfo | 11 -----------
tests/ts/findmnt/files/mountinfo | 1 -
tests/ts/findmnt/files/mountinfo-nonroot | 1 -
tests/ts/libmount/files/mountinfo | 1 -
16 files changed, 4 insertions(+), 44 deletions(-)
--- a/libmount/src/tab_parse.c
+++ b/libmount/src/tab_parse.c
@@ -225,11 +225,6 @@ static int mnt_parse_mountinfo_line(stru
goto fail;
}
- /* remove "\040(deleted)" suffix */
- p = (char *) endswith(fs->target, PATH_DELETED_SUFFIX);
- if (p && *p)
- *p = '\0';
-
s = skip_separator(s);
/* (6) vfs options (fs-independent) */
--- a/tests/expected/findmnt/filter-options
+++ b/tests/expected/findmnt/filter-options
@@ -28,5 +28,4 @@ TARGET SOURCE
/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=500,group_id=500
/var/lib/nfs/rpc_pipefs sunrpc rpc_pipefs rw,relatime
/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-/mnt/foo /fooooo bar rw,relatime
rc=0
--- a/tests/expected/findmnt/filter-options-nameval-neg
+++ b/tests/expected/findmnt/filter-options-nameval-neg
@@ -29,6 +29,5 @@ TARGET SOURCE
|-/home/kzak /dev/mapper/kzak-home ext4 rw,noatime,barrier=1,data=ordered
| `-/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=500,group_id=500
|-/var/lib/nfs/rpc_pipefs sunrpc rpc_pipefs rw,relatime
-|-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-`-/mnt/foo /fooooo bar rw,relatime
+`-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
rc=0
--- a/tests/expected/findmnt/filter-types-neg
+++ b/tests/expected/findmnt/filter-types-neg
@@ -28,5 +28,4 @@ TARGET SOURCE
/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=500,group_id=500
/var/lib/nfs/rpc_pipefs sunrpc rpc_pipefs rw,relatime
/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-/mnt/foo /fooooo bar rw,relatime
rc=0
--- a/tests/expected/findmnt/outputs-default
+++ b/tests/expected/findmnt/outputs-default
@@ -30,6 +30,5 @@ TARGET SOURCE
|-/home/kzak /dev/mapper/kzak-home ext4 rw,noatime,barrier=1,data=ordered
| `-/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=500,group_id=500
|-/var/lib/nfs/rpc_pipefs sunrpc rpc_pipefs rw,relatime
-|-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-`-/mnt/foo /fooooo bar rw,relatime
+`-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
rc=0
--- a/tests/expected/findmnt/outputs-force-tree
+++ b/tests/expected/findmnt/outputs-force-tree
@@ -30,6 +30,5 @@ TARGET SOURCE
|-/home/kzak /dev/mapper/kzak-home ext4 rw,noatime,barrier=1,data=ordered
| `-/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=500,group_id=500
|-/var/lib/nfs/rpc_pipefs sunrpc rpc_pipefs rw,relatime
-|-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-`-/mnt/foo /fooooo bar rw,relatime
+`-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
rc=0
--- a/tests/expected/findmnt/outputs-kernel
+++ b/tests/expected/findmnt/outputs-kernel
@@ -30,6 +30,5 @@ TARGET SOURCE
|-/home/kzak /dev/mapper/kzak-home ext4 rw,noatime,barrier=1,data=ordered
| `-/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=500,group_id=500
|-/var/lib/nfs/rpc_pipefs sunrpc rpc_pipefs rw,relatime
-|-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-`-/mnt/foo /fooooo bar rw,relatime
+`-/mnt/sounds //foo.home/bar/ cifs rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
rc=0
--- a/tests/expected/libmount/tabdiff-mount
+++ b/tests/expected/libmount/tabdiff-mount
@@ -1,3 +1,2 @@
/dev/mapper/kzak-home on /home/kzak: MOUNTED
-/fooooo on /mnt/foo: MOUNTED
tmpfs on /mnt/test/foo
bar: MOUNTED
--- a/tests/expected/libmount/tabdiff-move
+++ b/tests/expected/libmount/tabdiff-move
@@ -1,3 +1,2 @@
//foo.home/bar/ on /mnt/music: MOVED to /mnt/music
-/fooooo on /mnt/foo: UMOUNTED
tmpfs on /mnt/test/foo
bar: UMOUNTED
--- a/tests/expected/libmount/tabdiff-remount
+++ b/tests/expected/libmount/tabdiff-remount
@@ -1,4 +1,3 @@
/dev/mapper/kzak-home on /home/kzak: REMOUNTED from 'rw,noatime,barrier=1,data=ordered' to 'ro,noatime,barrier=1,data=ordered'
//foo.home/bar/ on /mnt/sounds: REMOUNTED from 'rw,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344' to 'ro,relatime,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344'
-/fooooo on /mnt/foo: UMOUNTED
tmpfs on /mnt/test/foo
bar: UMOUNTED
--- a/tests/expected/libmount/tabdiff-umount
+++ b/tests/expected/libmount/tabdiff-umount
@@ -1,3 +1,2 @@
/dev/mapper/kzak-home on /home/kzak: UMOUNTED
-/fooooo on /mnt/foo: UMOUNTED
tmpfs on /mnt/test/foo
bar: UMOUNTED
--- a/tests/expected/libmount/tabfiles-parse-mountinfo
+++ b/tests/expected/libmount/tabfiles-parse-mountinfo
@@ -351,17 +351,6 @@ id: 47
parent: 20
devno: 0:38
------ fs:
-source: /fooooo
-target: /mnt/foo
-fstype: bar
-optstr: rw,relatime
-VFS-optstr: rw,relatime
-FS-opstr: rw
-root: /
-id: 48
-parent: 20
-devno: 0:39
------- fs:
source: tmpfs
target: /mnt/test/foo
bar
fstype: tmpfs
--- a/tests/expected/libmount/tabfiles-py-parse-mountinfo
+++ b/tests/expected/libmount/tabfiles-py-parse-mountinfo
@@ -351,17 +351,6 @@ id: 47
parent: 20
devno: 0:38
------ fs:
-source: /fooooo
-target: /mnt/foo
-fstype: bar
-optstr: rw,relatime
-VFS-optstr: rw,relatime
-FS-opstr: rw
-root: /
-id: 48
-parent: 20
-devno: 0:39
------- fs:
source: tmpfs
target: /mnt/test/foo
bar
fstype: tmpfs
--- a/tests/ts/findmnt/files/mountinfo
+++ b/tests/ts/findmnt/files/mountinfo
@@ -30,4 +30,3 @@
44 41 0:36 / /home/kzak/.gvfs rw,nosuid,nodev,relatime - fuse.gvfs-fuse-daemon gvfs-fuse-daemon rw,user_id=500,group_id=500
45 20 0:37 / /var/lib/nfs/rpc_pipefs rw,relatime - rpc_pipefs sunrpc rw
47 20 0:38 / /mnt/sounds rw,relatime - cifs //foo.home/bar/ rw,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-48 20 0:39 / /mnt/foo\040(deleted) rw,relatime - bar /fooooo rw
--- a/tests/ts/findmnt/files/mountinfo-nonroot
+++ b/tests/ts/findmnt/files/mountinfo-nonroot
@@ -29,4 +29,3 @@
44 41 0:36 / /home/kzak/.gvfs rw,nosuid,nodev,relatime - fuse.gvfs-fuse-daemon gvfs-fuse-daemon rw,user_id=500,group_id=500
45 20 0:37 / /var/lib/nfs/rpc_pipefs rw,relatime - rpc_pipefs sunrpc rw
47 20 0:38 / /mnt/sounds rw,relatime - cifs //foo.home/bar/ rw,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-48 20 0:39 / /mnt/foo\040(deleted) rw,relatime - bar /fooooo rw
--- a/tests/ts/libmount/files/mountinfo
+++ b/tests/ts/libmount/files/mountinfo
@@ -30,5 +30,4 @@
44 41 0:36 / /home/kzak/.gvfs rw,nosuid,nodev,relatime - fuse.gvfs-fuse-daemon gvfs-fuse-daemon rw,user_id=500,group_id=500
45 20 0:37 / /var/lib/nfs/rpc_pipefs rw,relatime - rpc_pipefs sunrpc rw
47 20 0:38 / /mnt/sounds rw,relatime - cifs //foo.home/bar/ rw,unc=\\foo.home\bar,username=kzak,domain=SRGROUP,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.111.1,posixpaths,serverino,acl,rsize=16384,wsize=57344
-48 20 0:39 / /mnt/foo\040(deleted) rw,relatime - bar /fooooo rw
49 20 0:56 / /mnt/test/foo
bar rw,relatime shared:323 - tmpfs tmpfs rw
|
