Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
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+What:		security/ima/policy
+Date:		May 2008
+Contact:	Mimi Zohar <zohar@us.ibm.com>
+Description:
+		The Trusted Computing Group(TCG) runtime Integrity
+		Measurement Architecture(IMA) maintains a list of hash
+		values of executables and other sensitive system files
+		loaded into the run-time of this system.  At runtime,
+		the policy can be constrained based on LSM specific data.
+		Policies are loaded into the securityfs file ima/policy
+		by opening the file, writing the rules one at a time and
+		then closing the file.  The new policy takes effect after
+		the file ima/policy is closed.
+
+		IMA appraisal, if configured, uses these file measurements
+		for local measurement appraisal.
+
+		rule format: action [condition ...]
+
+		action: measure | dont_measure | appraise | dont_appraise |
+			audit | hash | dont_hash
+		condition:= base | lsm  [option]
+			base:	[[func=] [mask=] [fsmagic=] [fsuuid=] [uid=]
+				[euid=] [fowner=] [fsname=]]
+			lsm:	[[subj_user=] [subj_role=] [subj_type=]
+				 [obj_user=] [obj_role=] [obj_type=]]
+			option:	[[appraise_type=]] [permit_directio]
+
+		base: 	func:= [BPRM_CHECK][MMAP_CHECK][CREDS_CHECK][FILE_CHECK][MODULE_CHECK]
+				[FIRMWARE_CHECK]
+				[KEXEC_KERNEL_CHECK] [KEXEC_INITRAMFS_CHECK]
+			mask:= [[^]MAY_READ] [[^]MAY_WRITE] [[^]MAY_APPEND]
+			       [[^]MAY_EXEC]
+			fsmagic:= hex value
+			fsuuid:= file system UUID (e.g 8bcbe394-4f13-4144-be8e-5aa9ea2ce2f6)
+			uid:= decimal value
+			euid:= decimal value
+			fowner:= decimal value
+		lsm:  	are LSM specific
+		option:	appraise_type:= [imasig]
+			pcr:= decimal value
+
+		default policy:
+			# PROC_SUPER_MAGIC
+			dont_measure fsmagic=0x9fa0
+			dont_appraise fsmagic=0x9fa0
+			# SYSFS_MAGIC
+			dont_measure fsmagic=0x62656572
+			dont_appraise fsmagic=0x62656572
+			# DEBUGFS_MAGIC
+			dont_measure fsmagic=0x64626720
+			dont_appraise fsmagic=0x64626720
+			# TMPFS_MAGIC
+			dont_measure fsmagic=0x01021994
+			dont_appraise fsmagic=0x01021994
+			# RAMFS_MAGIC
+			dont_appraise fsmagic=0x858458f6
+			# DEVPTS_SUPER_MAGIC
+			dont_measure fsmagic=0x1cd1
+			dont_appraise fsmagic=0x1cd1
+			# BINFMTFS_MAGIC
+			dont_measure fsmagic=0x42494e4d
+			dont_appraise fsmagic=0x42494e4d
+			# SECURITYFS_MAGIC
+			dont_measure fsmagic=0x73636673
+			dont_appraise fsmagic=0x73636673
+			# SELINUX_MAGIC
+			dont_measure fsmagic=0xf97cff8c
+			dont_appraise fsmagic=0xf97cff8c
+			# CGROUP_SUPER_MAGIC
+			dont_measure fsmagic=0x27e0eb
+			dont_appraise fsmagic=0x27e0eb
+			# NSFS_MAGIC
+			dont_measure fsmagic=0x6e736673
+			dont_appraise fsmagic=0x6e736673
+
+			measure func=BPRM_CHECK
+			measure func=FILE_MMAP mask=MAY_EXEC
+			measure func=FILE_CHECK mask=MAY_READ uid=0
+			measure func=MODULE_CHECK
+			measure func=FIRMWARE_CHECK
+			appraise fowner=0
+
+		The default policy measures all executables in bprm_check,
+		all files mmapped executable in file_mmap, and all files
+		open for read by root in do_filp_open.  The default appraisal
+		policy appraises all files owned by root.
+
+		Examples of LSM specific definitions:
+
+		SELinux:
+			dont_measure obj_type=var_log_t
+			dont_appraise obj_type=var_log_t
+			dont_measure obj_type=auditd_log_t
+			dont_appraise obj_type=auditd_log_t
+			measure subj_user=system_u func=FILE_CHECK mask=MAY_READ
+			measure subj_role=system_r func=FILE_CHECK mask=MAY_READ
+
+		Smack:
+			measure subj_user=_ func=FILE_CHECK mask=MAY_READ
+
+		Example of measure rules using alternate PCRs:
+
+			measure func=KEXEC_KERNEL_CHECK pcr=4
+			measure func=KEXEC_INITRAMFS_CHECK pcr=5