[PATCH] Smack modifications for: security: Allow all LSMs to provide xattrs for inode_init_security hook
Casey Schaufler
casey at schaufler-ca.com
Tue Apr 18 16:02:12 UTC 2023
On 4/18/2023 12:05 AM, Roberto Sassu wrote:
> On Mon, 2023-04-17 at 09:41 -0700, Casey Schaufler wrote:
>> On 4/13/2023 12:11 AM, Roberto Sassu wrote:
>>> On Wed, 2023-04-12 at 13:29 -0700, Casey Schaufler wrote:
>>>> On 4/12/2023 12:22 AM, Roberto Sassu wrote:
>>>>> On Tue, 2023-04-11 at 10:54 -0700, Casey Schaufler wrote:
>>>>>> On 4/11/2023 10:23 AM, Roberto Sassu wrote:
>>>>>>> From: Roberto Sassu <roberto.sassu at huawei.com>
>>>>>>>
>>>>>>> Very very quick modification. Not tested.
>>>>>>>
>>>>>>> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
>>>>>>> ---
>>>>>>> security/smack/smack.h | 2 +-
>>>>>>> security/smack/smack_lsm.c | 42 ++++++++++++++++++++------------------
>>>>>>> 2 files changed, 23 insertions(+), 21 deletions(-)
>>>>>>>
>>>>>>> diff --git a/security/smack/smack.h b/security/smack/smack.h
>>>>>>> index e2239be7bd6..f00c8498c60 100644
>>>>>>> --- a/security/smack/smack.h
>>>>>>> +++ b/security/smack/smack.h
>>>>>>> @@ -127,7 +127,7 @@ struct task_smack {
>>>>>>>
>>>>>>> #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
>>>>>>> #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
>>>>>>> -#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
>>>>>>> +#define SMK_INODE_CHANGED 0x04 /* smack was transmuted (unused) */
>>>>>> See below ...
>>>>>>
>>>>>>> #define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
>>>>>>>
>>>>>>> /*
>>>>>>> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
>>>>>>> index 8392983334b..b43820bdbd0 100644
>>>>>>> --- a/security/smack/smack_lsm.c
>>>>>>> +++ b/security/smack/smack_lsm.c
>>>>>>> @@ -54,12 +54,12 @@
>>>>>>>
>>>>>>> /*
>>>>>>> * Smack uses multiple xattrs.
>>>>>>> - * SMACK64 - for access control, SMACK64EXEC - label for the program,
>>>>>>> - * SMACK64MMAP - controls library loading,
>>>>>>> + * SMACK64 - for access control,
>>>>>>> * SMACK64TRANSMUTE - label initialization,
>>>>>>> - * Not saved on files - SMACK64IPIN and SMACK64IPOUT
>>>>>>> + * Not saved on files - SMACK64IPIN and SMACK64IPOUT,
>>>>>>> + * Must be set explicitly - SMACK64EXEC and SMACK64MMAP
>>>>>>> */
>>>>>>> -#define SMACK_INODE_INIT_XATTRS 4
>>>>>>> +#define SMACK_INODE_INIT_XATTRS 2
>>>>>>>
>>>>>>> #ifdef SMACK_IPV6_PORT_LABELING
>>>>>>> static DEFINE_MUTEX(smack_ipv6_lock);
>>>>>>> @@ -957,11 +957,11 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
>>>>>>> const struct qstr *qstr,
>>>>>>> struct xattr *xattrs, int *xattr_count)
>>>>>>> {
>>>>>>> - struct inode_smack *issp = smack_inode(inode);
>>>>>>> struct smack_known *skp = smk_of_current();
>>>>>>> struct smack_known *isp = smk_of_inode(inode);
>>>>>>> struct smack_known *dsp = smk_of_inode(dir);
>>>>>>> struct xattr *xattr = lsm_get_xattr_slot(xattrs, xattr_count);
>>>>>>> + struct xattr *xattr2;
>>>>>> I'm going to channel Paul and suggest this be xattr_transmute instead of xattr2.
>>>>>> It also looks like it could move to be declared in the if clause.
>>>>>>
>>>>>>> int may;
>>>>>>>
>>>>>>> if (xattr) {
>>>>>>> @@ -979,7 +979,17 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
>>>>>>> if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
>>>>>>> smk_inode_transmutable(dir)) {
>>>>>>> isp = dsp;
>>>>>>> - issp->smk_flags |= SMK_INODE_CHANGED;
>>>>>> I think you need to keep this. More below.
>>>>>>
>>>>>>> + xattr2 = lsm_get_xattr_slot(xattrs, xattr_count);
>>>>>>> + if (xattr2) {
>>>>>>> + xattr2->value = kmemdup(TRANS_TRUE,
>>>>>>> + TRANS_TRUE_SIZE,
>>>>>>> + GFP_NOFS);
>>>>>>> + if (xattr2->value == NULL)
>>>>>>> + return -ENOMEM;
>>>>>>> +
>>>>>>> + xattr2->value_len = TRANS_TRUE_SIZE;
>>>>>>> + xattr2->name = XATTR_NAME_SMACKTRANSMUTE;
>>>>>>> + }
>>>>>>> }
>>>>>>>
>>>>>>> xattr->value = kstrdup(isp->smk_known, GFP_NOFS);
>>>>>>> @@ -3512,20 +3522,12 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
>>>>>>> * If there is a transmute attribute on the
>>>>>>> * directory mark the inode.
>>>>>>> */
>>>>>>> - if (isp->smk_flags & SMK_INODE_CHANGED) {
>>>>>>> - isp->smk_flags &= ~SMK_INODE_CHANGED;
>>>>>>> - rc = __vfs_setxattr(&nop_mnt_idmap, dp, inode,
>>>>>>> - XATTR_NAME_SMACKTRANSMUTE,
>>>>>>> - TRANS_TRUE, TRANS_TRUE_SIZE,
>>>>>>> - 0);
>>>>>>> - } else {
>>>>>>> - rc = __vfs_getxattr(dp, inode,
>>>>>>> - XATTR_NAME_SMACKTRANSMUTE, trattr,
>>>>>>> - TRANS_TRUE_SIZE);
>>>>>>> - if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
>>>>>>> - TRANS_TRUE_SIZE) != 0)
>>>>>>> - rc = -EINVAL;
>>>>>>> - }
>>>>>>> + rc = __vfs_getxattr(dp, inode,
>>>>>>> + XATTR_NAME_SMACKTRANSMUTE, trattr,
>>>>>>> + TRANS_TRUE_SIZE);
>>>>>>> + if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
>>>>>>> + TRANS_TRUE_SIZE) != 0)
>>>>>>> + rc = -EINVAL;
>>>>>> Where is the SMACK64_TRANSMUTE attribute going to get set on the file?
>>>>>> It's not going to get set in smack_init_inode_security(). The inode will
>>>>> Isn't that the purpose of the inode_init_security hook?
>>>> No. It initializes the in-memory inode.
>>> I hope I'm not mistaken here...
>>>
>>> I make a small example. Filesystems call
>>> security_inode_init_security(). Ext4 does:
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/ext4/xattr_security.c?h=v6.3-rc6#n54
>>>
>>> security_inode_init_security() allocates new_xattrs. Each LSM fills
>>> new_xattrs. At the end of the loop, if there is at least one xattr
>>> filled, the initxattrs() callback passed by the caller of
>>> security_inode_init_security() is called.
>>>
>>> The ext4 initxattrs() callback is:
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/ext4/xattr_security.c?h=v6.3-rc6#n35
>>>
>>> which scans the xattr array and, for each xattr,
>>> calls ext4_xattr_set_handle().
>>>
>>> Maybe I'm overlooking it, but ext4_xattr_set_handle() is setting xattrs
>>> on the disk. Am I wrong?
>> Yes, you're wrong. I tried your change, and the SMACK64_TRANSMUTE isn't
>> set on the sub-directory when it's created. The __vfs_setxattr() call really
>> is necessary.
> Could you please also check if there is any change with this fix:
>
> Replace:
>
> xattr2->name = XATTR_NAME_SMACKTRANSMUTE;
>
> with:
>
> xattr2->name = XATTR_SMACK_TRANSMUTE;
>
> Thanks
Unless I'm missing something really obvious there's no way that any
of the evm/ima changes would obviate the need for the __vfs_setxattr() call.
It's real easy to verify correct behavior, see the attached script.
(you'll want to change the "notroot" value to a user on your system)
>
> Roberto
>
>>> Thanks
>>>
>>> Roberto
>>>
>>>>> After all LSMs provide one or multiple xattrs, xattrs are going to be
>>>>> written to the disk with the initxattr() callback of filesystems.
>>>>>
>>>>> There is a small mistake above (XATTR_SMACK_TRANSMUTE instead
>>>>> of XATTR_NAME_SMACKTRANSMUTE, as we are providing just the suffix).
>>>> but I'm pretty sure the __vfs_setxattr() call is necessary to get
>>>> the attribute written out. With your change the in-memory inode will
>>>> get the attribute, but if you reboot it won't be on the directory.
>>>>
>>>>> 95 Passed, 0 Failed, 100% Success rate
>>>>>
>>>>> There was a test failing in dir-transmute.sh, before I fixed the xattr
>>>>> name.
>>>>>
>>>>> Thanks
>>>>>
>>>>> Roberto
>>>>>
>>>>>> know it's transmuting, but it won't get to disk without the __vfs_setxattr()
>>>>>> here in smack_d_instantiate(). Now, it's been a long time since that code
>>>>>> was written, so I could be wrong, but I'm pretty sure about that.
>>>>>>
>>>>>> I think that you should be fine with the changes in smack_init_inode_security(),
>>>>>> and leaving smack_d_instantiate() untouched.
>>>>>>
>>>>>>> if (rc >= 0)
>>>>>>> transflag = SMK_INODE_TRANSMUTE;
>>>>>>> }
-------------- next part --------------
#! /bin/sh
#
#
TESTDIR="/tmp/transmute-test"
TESTFILE="$TESTDIR"/file
TESTSUBDIR="$TESTDIR"/subdir
TESTSUB2DIR="$TESTSUBDIR"/subdir
TESTSUB3DIR="$TESTSUB2DIR"/subdir
USERID=`/usr/bin/id -u`
LOAD=/sys/fs/smackfs/load2
if [ "$USERID" != "0" ]
then
echo User ID $USERID is not root.
exit 1
fi
notroot="cschaufler"
# NOTROOT=`tail -1 /etc/passwd | sed -e 's/:.*//'`
# echo Using '"'$NOTROOT'"' as a test user.
RUNAS=`cat /proc/self/attr/current`
rm -rf $TESTDIR
mkdir $TESTDIR
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
#
# Simple set/list/get tests
#
TLABEL=`attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
if [ "x""$TLABEL" != "x" ]
then
echo Initial transmute label is unexpectedly '"'"$TLABEL"'"'.
exit 1
fi
attr -q -S -s SMACK64TRANSMUTE -V WILL $TESTDIR 2> /dev/null
TLABEL=`attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
if [ "x""$TLABEL" != "x" ]
then
echo Setting transmute label should not have gotten '"'"$TLABEL"'"'.
exit 1
fi
TLIST=`attr -q -S -l $TESTDIR | grep TRANSMUTE`
if [ "x""$TLIST" != "x" ]
then
echo Setting transmute label listed incorrectly as '"'"$TLIST"'"'.
exit 1
fi
attr -q -S -s SMACK64TRANSMUTE -V TRUE $TESTDIR 2> /dev/null
TLABEL=`attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
if [ "x""$TLABEL" != "xTRUE" ]
then
echo Setting transmute label should not have gotten '"'"$TLABEL"'"'.
exit 1
fi
TLIST=`attr -q -S -l $TESTDIR | grep TRANSMUTE`
if [ "x""$TLIST" != "xSMACK64TRANSMUTE" ]
then
echo Setting transmute label listed incorrectly as '"'"$TLIST"'"'.
exit 1
fi
attr -q -S -r SMACK64TRANSMUTE $TESTDIR 2> /dev/null
TLABEL=`attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
if [ "x""$TLABEL" != "x" ]
then
echo Removing transmute label left '"'"$TLABEL"'"' behind.
exit 1
fi
rm -rf $TESTDIR
#
# Rule setting tests
#
# 1 2 3 4 5 6
# 1234567890123456789012345678901234567890123456789012345678901234567890
# subject-label.......... object-label........... rwxat
#
# 1 2 3
# 123456789012345678901234567890
SUBJECT="Snap "
SUBNAME="Snap"
# 1 2 3
# 123456789012345678901234567890
OBJECT="Crackle "
OBNAME="Crackle"
OLDRULE=`grep '^'"$SUBNAME"' '"$OBNAME" $LOAD`
echo -n "$SUBJECT"' '"$OBJECT"' ''rwxa' > $LOAD
RULE=`grep '^'"$SUBNAME"' '"$OBNAME" $LOAD`
if [ "x""$RULE" != "x""$SUBNAME"' '"$OBNAME"' rwxa' ]
then
echo Setting rule without '"'t'"' unexpectedly '"'"$RULE"'"'.
exit 1
fi
echo -n "$SUBJECT"' '"$OBJECT"' ''rwxat' > $LOAD
RULE=`grep '^'"$SUBNAME"' '"$OBNAME" $LOAD`
if [ "x""$RULE" != "x""$SUBNAME"' '"$OBNAME"' rwxat' ]
then
echo Setting rule with '"'t'"' unexpectedly '"'"$RULE"'"'.
exit 1
fi
#
# Verify correct label behavior with neither a transmute
# directory nor a transmute rule.
#
rm -rf $TESTDIR
mkdir $TESTDIR
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
chmod 777 $TESTDIR
attr -q -S -s SMACK64 -V $OBNAME $TESTDIR
echo -n "$SUBJECT"' '"$OBJECT"' ''rwxa' > $LOAD
echo "$SUBNAME" > /proc/self/attr/current
su - $NOTROOT -c "date > $TESTFILE"
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTFILE`
if [ 'x'"$SUBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$SUBNAME'"' but got '"'$GOT'"'.
exit 1
fi
#
# Verify correct label behavior with a transmute
# directory but not a transmute rule.
#
rm -rf $TESTDIR
mkdir $TESTDIR
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
chmod 777 $TESTDIR
attr -q -S -s SMACK64 -V $OBNAME $TESTDIR
attr -q -S -s SMACK64TRANSMUTE -V TRUE $TESTDIR
echo -n "$SUBJECT"' '"$OBJECT"' ''rwxa' > $LOAD
echo "$SUBNAME" > /proc/self/attr/current
su - $NOTROOT -c "date > $TESTFILE"
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTFILE`
if [ 'x'"$SUBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$SUBNAME'"' but got '"'$GOT'"'.
exit 1
fi
#
# Verify correct label behavior without a transmute
# directory but with a transmute rule.
#
rm -rf $TESTDIR
mkdir $TESTDIR
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
chmod 777 $TESTDIR
attr -q -S -s SMACK64 -V $OBNAME $TESTDIR
echo -n "$SUBJECT"' '"$OBJECT"' ''rwxat' > $LOAD
echo "$SUBNAME" > /proc/self/attr/current
su - $NOTROOT -c "date > $TESTFILE"
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTFILE`
if [ 'x'"$SUBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$SUBNAME'"' but got '"'$GOT'"'.
exit 1
fi
#
# Verify correct label behavior with a transmute
# directory and a transmute rule.
#
rm -rf $TESTDIR
mkdir $TESTDIR
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
chmod 777 $TESTDIR
attr -q -S -s SMACK64 -V $OBNAME $TESTDIR
attr -q -S -s SMACK64TRANSMUTE -V TRUE $TESTDIR
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
echo -n "$SUBJECT"' '"$OBJECT"' ''rwxat' > $LOAD
echo "$SUBNAME" > /proc/self/attr/current
su - $NOTROOT -c "date > $TESTFILE"
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTFILE`
if [ 'x'"$OBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$OBNAME'"' but got '"'$GOT'"'.
attr -l -S $TESTDIR
attr -S -g SMACK64 $TESTFILE
grep '^'"$SUBNAME"' '"$OBNAME" $LOAD
exit 1
else
echo Expected '"'$OBNAME'"' and got '"'$GOT'"' successfully.
fi
#
# Verify correct label behavior with a transmute
# directory and subdirectories
#
echo "$SUBNAME" > /proc/self/attr/current
rm -rf $TESTSUBDIR
su - $NOTROOT -c "mkdir $TESTSUBDIR"
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
echo Dir: `attr -q -S -g SMACK64 $TESTSUBDIR 2> /dev/null` `ls -id $TESTSUBDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTSUBDIR 2> /dev/null`
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTSUBDIR`
if [ 'x'"$OBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$OBNAME'"' but got '"'$GOT'"'.
else
echo Expected '"'$OBNAME'"' and got '"'$GOT'"' successfully.
fi
echo "$SUBNAME" > /proc/self/attr/current
rm -rf $TESTSUB2DIR
su - $NOTROOT -c "mkdir $TESTSUB2DIR"
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
echo Dir: `attr -q -S -g SMACK64 $TESTSUBDIR 2> /dev/null` `ls -id $TESTSUBDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTSUBDIR 2> /dev/null`
echo Dir: `attr -q -S -g SMACK64 $TESTSUB2DIR 2> /dev/null` `ls -id $TESTSUB2DIR` `attr -q -S -g SMACK64TRANSMUTE $TESTSUB2DIR 2> /dev/null`
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTSUB2DIR`
if [ 'x'"$OBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$OBNAME'"' but got '"'$GOT'"'.
else
echo Expected '"'$OBNAME'"' and got '"'$GOT'"' successfully.
fi
echo "$SUBNAME" > /proc/self/attr/current
rm -rf $TESTSUB3DIR
su - $NOTROOT -c "mkdir $TESTSUB3DIR"
grep `cat /proc/self/attr/current` $LOAD
echo Dir: `attr -q -S -g SMACK64 $TESTDIR 2> /dev/null` `ls -id $TESTDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTDIR 2> /dev/null`
echo Dir: `attr -q -S -g SMACK64 $TESTSUBDIR 2> /dev/null` `ls -id $TESTSUBDIR` `attr -q -S -g SMACK64TRANSMUTE $TESTSUBDIR 2> /dev/null`
echo Dir: `attr -q -S -g SMACK64 $TESTSUB2DIR 2> /dev/null` `ls -id $TESTSUB2DIR` `attr -q -S -g SMACK64TRANSMUTE $TESTSUB2DIR 2> /dev/null`
echo Dir: `attr -q -S -g SMACK64 $TESTSUB3DIR 2> /dev/null` `ls -id $TESTSUB3DIR` `attr -q -S -g SMACK64TRANSMUTE $TESTSUB3DIR 2> /dev/null`
echo "$RUNAS" > /proc/self/attr/current
GOT=`attr -q -S -g SMACK64 $TESTSUB3DIR`
if [ 'x'"$OBNAME" != 'x'"$GOT" ]
then
echo Expected '"'$OBNAME'"' but got '"'$GOT'"'.
else
echo Expected '"'$OBNAME'"' and got '"'$GOT'"' successfully.
fi
#
# test SMACK64TRANSMUTE removal
#
echo test SMACK64TRANSMUTE removal
attr -S -g SMACK64TRANSMUTE $TESTSUB3DIR
rm -rf $TESTSUB3DIR
attr -S -r SMACK64TRANSMUTE $TESTSUB2DIR
su - $NOTROOT -c "mkdir $TESTSUB3DIR"
attr -S -g SMACK64TRANSMUTE $TESTSUB2DIR
attr -S -g SMACK64TRANSMUTE $TESTSUB3DIR
rm -rf $TESTDIR
#
# Restore old label rule.
#
if [ "x""$OLDRULE" != "x" ]
then
RAWOLDMODE=`echo $OLDRULE | sed -e 's/.* //'`
I=`echo $RAWOLDMODE | grep 'r'`
if [ "x""$I" = "x" ]
then
OLDMODE="-"
else
OLDMODE="r"
fi
I=`echo $RAWOLDMODE | grep 'w'`
if [ "x""$I" = "x" ]
then
OLDMODE="$OLDMODE""-"
else
OLDMODE="$OLDMODE""w"
fi
I=`echo $RAWOLDMODE | grep 'x'`
if [ "x""$I" = "x" ]
then
OLDMODE="$OLDMODE""-"
else
OLDMODE="$OLDMODE""x"
fi
I=`echo $RAWOLDMODE | grep 'a'`
if [ "x""$I" = "x" ]
then
OLDMODE="$OLDMODE""-"
else
OLDMODE="$OLDMODE""a"
fi
I=`echo $RAWOLDMODE | grep 't'`
if [ "x""$I" = "x" ]
then
OLDMODE="$OLDMODE""-"
else
OLDMODE="$OLDMODE""t"
fi
echo -n "$SUBJECT"' '"$OBJECT"' '"$OLDMODE" > $LOAD
# echo Rule reset to '"'"$SUBNAME"' '"$OBNAME"' '"$OLDMODE"'"'
else
echo -n "$SUBJECT"' '"$OBJECT"' ''-----' > $LOAD
# echo Rule reset to '"'"$SUBNAME"' '"$OBNAME"' '"-----"'"'
fi
echo "$RUNAS" > /proc/self/attr/current
rm -rf $TESTDIR
exit 0
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