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Tue, 4 Feb 2025 00:50:14 +0000 (GMT) Message-ID: <4e4fb197b7127f8d82705ec441e8a273cd237b7f.camel@linux.ibm.com> Subject: Re: [PATCH] IMA: measure.policy: limit dont_measure tmpfs policy to func=FILE_CHECK From: Mimi Zohar To: Petr Vorel , ltp@lists.linux.it Cc: linux-integrity@vger.kernel.org In-Reply-To: <20250203210233.1407530-1-pvorel@suse.cz> References: <20250203210233.1407530-1-pvorel@suse.cz> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 03 Feb 2025 18:48:10 -0500 User-Agent: Evolution 3.52.4 (3.52.4-2.fc40) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: OSMniuTFzQyC2Z-dKRU-m4GR0-1MMSrz X-Proofpoint-ORIG-GUID: OSMniuTFzQyC2Z-dKRU-m4GR0-1MMSrz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-03_10,2025-01-31_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 mlxscore=0 suspectscore=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 phishscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502040002 On Mon, 2025-02-03 at 22:02 +0100, Petr Vorel wrote: > add func=3DFILE_CHECK to dont_measure tmpfs >=20 > Similarly to tcb.policy limit dont_measure tmpfs policy to func=3DFILE_CH= ECK. > This allows to do extra measurements, e.g. kexec boot command line, see > kernel commit >=20 > 7eef7c8bac9a ("ima: limit the builtin 'tcb' dont_measure tmpfs policy rul= e") >=20 > Also remove leading 0 from tmpfs magic (to match IMA docs and tcb.policy)= . >=20 > Suggested-by: Mimi Zohar > Signed-off-by: Petr Vorel Reviewed-by: Mimi Zohar > --- > =C2=A0.../security/integrity/ima/datafiles/ima_policy/measure.policy=C2= =A0 | 2 +- > =C2=A01 file changed, 1 insertion(+), 1 deletion(-) >=20 > diff --git > a/testcases/kernel/security/integrity/ima/datafiles/ima_policy/measure.po= licy > b/testcases/kernel/security/integrity/ima/datafiles/ima_policy/measure.po= licy > index 9976ddf2de..8abd05fb1a 100644 > --- a/testcases/kernel/security/integrity/ima/datafiles/ima_policy/measur= e.policy > +++ b/testcases/kernel/security/integrity/ima/datafiles/ima_policy/measur= e.policy > @@ -8,7 +8,7 @@ dont_measure fsmagic=3D0x62656572 > =C2=A0# DEBUGFS_MAGIC > =C2=A0dont_measure fsmagic=3D0x64626720 > =C2=A0# TMPFS_MAGIC > -dont_measure fsmagic=3D0x01021994 > +dont_measure fsmagic=3D0x1021994 func=3DFILE_CHECK > =C2=A0# SECURITYFS_MAGIC > =C2=A0dont_measure fsmagic=3D0x73636673 > =C2=A0measure func=3DFILE_MMAP mask=3DMAY_EXEC