[PATCH next] audit: printk before dropping logs in audit_log_end
by Ecronic
If the log rate of audit exceeds audit_rate_limit, audit_log_end
will drop the audit logs. Printk before dropping them may be a
better choice.
Signed-off-by: Ecronic <ecronic(a)outlook.com>
---
kernel/audit.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index a75978ae38ad..3f5be93447cb 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -2415,10 +2415,10 @@ void audit_log_end(struct audit_buffer *ab)
if (!ab)
return;
- if (audit_rate_check()) {
- skb = ab->skb;
- ab->skb = NULL;
+ skb = ab->skb;
+ ab->skb = NULL;
+ if (audit_rate_check()) {
/* setup the netlink header, see the comments in
* kauditd_send_multicast_skb() for length quirks */
nlh = nlmsg_hdr(skb);
@@ -2427,8 +2427,11 @@ void audit_log_end(struct audit_buffer *ab)
/* queue the netlink packet and poke the kauditd thread */
skb_queue_tail(&audit_queue, skb);
wake_up_interruptible(&kauditd_wait);
- } else
+ } else {
+ kauditd_printk_skb(skb);
+ kfree_skb(skb);
audit_log_lost("rate limit exceeded");
+ }
audit_buffer_free(ab);
}
--
2.30.0
2 years, 2 months
[GIT PULL] Audit fixes for v6.0 (#1)
by Paul Moore
Linus,
A single audit patch to fix a potential double-free on a fsnotify
error path. Please merge for v6.0.
Thanks,
-Paul
--
The following changes since commit 1c23f9e627a7b412978b4e852793c5e3c3efc555:
Linux 6.0-rc2 (2022-08-21 17:32:54 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git
tags/audit-pr-20220823
for you to fetch changes up to ad982c3be4e60c7d39c03f782733503cbd88fd2a:
audit: fix potential double free on error path from
fsnotify_add_inode_mark (2022-08-22 18:50:06 -0400)
----------------------------------------------------------------
audit/stable-6.0 PR 20220823
----------------------------------------------------------------
Gaosheng Cui (1):
audit: fix potential double free on error path from
fsnotify_add_inode_mark
kernel/audit_fsnotify.c | 1 +
1 file changed, 1 insertion(+)
--
paul-moore.com
2 years, 2 months
data-race in audit_log_start / audit_receive
by Abhishek Shah
Hi all,
We found a data race involving the *audit_cmd_mutex.owner *variable. We
think this bug is concerning because *audit_ctl_owner_current *is used at a
location that controls the scheduling of tasks shown here
<https://elixir.bootlin.com/linux/v5.18-rc5/source/kernel/audit.c#L1868>.
Please let us know what you think.
Thanks!
*-----------------Report----------------------*
*write* to 0xffffffff881d0710 of 8 bytes by task 6541 on cpu 0:
audit_ctl_lock kernel/audit.c:237 [inline]
audit_receive+0x77/0x2940 kernel/audit.c:1557
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x652/0x730 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x643/0x740 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:705 [inline]
sock_sendmsg net/socket.c:725 [inline]
____sys_sendmsg+0x348/0x4c0 net/socket.c:2413
___sys_sendmsg net/socket.c:2467 [inline]
__sys_sendmsg+0x159/0x1f0 net/socket.c:2496
__do_sys_sendmsg net/socket.c:2505 [inline]
__se_sys_sendmsg net/socket.c:2503 [inline]
__x64_sys_sendmsg+0x47/0x50 net/socket.c:2503
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
*read* to 0xffffffff881d0710 of 8 bytes by task 6542 on cpu 1:
audit_ctl_owner_current kernel/audit.c:258 [inline]
audit_log_start+0x127/0x690 kernel/audit.c:1868
common_lsm_audit+0x61/0xee0 security/lsm_audit.c:457
slow_avc_audit+0xcb/0x100 security/selinux/avc.c:796
avc_audit security/selinux/include/avc.h:135 [inline]
avc_has_perm+0x114/0x140 security/selinux/avc.c:1193
selinux_socket_create+0xf1/0x170 security/selinux/hooks.c:4570
security_socket_create+0x58/0xb0 security/security.c:2185
__sock_create+0xe2/0x530 net/socket.c:1423
sock_create net/socket.c:1519 [inline]
__sys_socket+0xb8/0x210 net/socket.c:1561
__do_sys_socket net/socket.c:1570 [inline]
__se_sys_socket net/socket.c:1568 [inline]
__x64_sys_socket+0x42/0x50 net/socket.c:1568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6542 Comm: syz-executor2-n Not tainted 5.18.0-rc5+ #107
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1
04/01/2014
*Reproducing Inputs*
Input CPU 0:
r0 = socket$nl_audit(0x10, 0x3, 0x9)
sendmsg$AUDIT_USER_AVC(r0, &(0x7f0000000200)={0x0, 0x0,
&(0x7f00000001c0)={&(0x7f0000000240)=ANY=[], 0x74}}, 0x0)
Input CPU 1:
r0 = socket$inet_dccp(0x2, 0x6, 0x0)
connect$inet(r0, &(0x7f0000000000)={0x2, 0x0, @private=0xa010101}, 0x10)
2 years, 2 months
[PATCH next] audit: fix potential double free on error path from fsnotify_add_inode_mark
by Gaosheng Cui
Audit_alloc_mark() assign pathname to audit_mark->path, on error path
from fsnotify_add_inode_mark(), fsnotify_put_mark will free memory
of audit_mark->path, but the caller of audit_alloc_mark will free
the pathname again, so there will be double free problem.
Fix this by resetting audit_mark->path to NULL pointer on error path
from fsnotify_add_inode_mark().
Fixes: 7b1293234084d ("fsnotify: Add group pointer in fsnotify_init_mark()")
Signed-off-by: Gaosheng Cui <cuigaosheng1(a)huawei.com>
---
kernel/audit_fsnotify.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index 6432a37ac1c9..c565fbf66ac8 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -102,6 +102,7 @@ struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pa
ret = fsnotify_add_inode_mark(&audit_mark->mark, inode, 0);
if (ret < 0) {
+ audit_mark->path = NULL;
fsnotify_put_mark(&audit_mark->mark);
audit_mark = ERR_PTR(ret);
}
--
2.25.1
2 years, 2 months
[PATCH] kernel: fix repeated words in comments
by Jilin Yuan
Delete the redundant word 'doesn't'.
Signed-off-by: Jilin Yuan <yuanjilin(a)cdjrlc.com>
---
kernel/auditsc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index f3a2abd6d1a1..00d6e5130c24 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1858,7 +1858,7 @@ void __audit_free(struct task_struct *tsk)
/* We are called either by do_exit() or the fork() error handling code;
* in the former case tsk == current and in the latter tsk is a
- * random task_struct that doesn't doesn't have any meaningful data we
+ * random task_struct that doesn't have any meaningful data we
* need to log via audit_log_exit().
*/
if (tsk == current && !context->dummy) {
--
2.36.1
2 years, 2 months
[RFC PATCH v8 00/17] Integrity Policy Enforcement LSM (IPE)
by Deven Bowers
Overview:
---------
IPE is a Linux Security Module which takes a complimentary approach to
access control. Whereas existing mandatory access control mechanisms
base their decisions on labels and paths, IPE instead determines
whether or not an operation should be allowed based on immutable
security properties of the system component the operation is being
performed on.
IPE itself does not mandate how the security property should be
evaluated, but relies on an extensible set of external property providers
to evaluate the component. IPE makes its decision based on reference
values for the selected properties, specified in the IPE policy.
The reference values represent the value that the policy writer and the
local system administrator (based on the policy signature) trust for the
system to accomplish the desired tasks.
One such provider is for example dm-verity, which is able to represent
the integrity property of a partition (its immutable state) with a digest.
IPE is compiled under CONFIG_SECURITY_IPE.
Use Cases
---------
IPE works best in fixed-function devices: Devices in which their purpose
is clearly defined and not supposed to be changed (e.g. network firewall
device in a data center, an IoT device, etcetera), where all software and
configuration is built and provisioned by the system owner.
IPE is a long-way off for use in general-purpose computing: the Linux
community as a whole tends to follow a decentralized trust model,
known as the web of trust, which IPE has no support for as of yet.
There are exceptions, to this general-purpose computing rule; however,
such as the scenario, wherein Linux distribution vendors trust only
their own keys - in this case, IPE can be used to enforce the trust
reqiurement.
IPE, instead of supporting web of trust, supports PKI, which generally
designates a set of entities that provide a measure absolute trust.
Commonly used in embedded systems,
Additionally, while most packages are signed today, the files inside
the packages (for instance, the executables), tend to be unsigned. This
makes it difficult to utilize IPE in systems where a package manager is
expected to be functional, without major changes to the package manager
and ecosystem behind it.
DIGLIM[1] is a system that when combined with IPE, could be used to
enable general purpose computing scenarios.
Policy:
-------
IPE policy is a plain-text policy composed of multiple statements
over several lines. There is one required line, at the top of the
policy, indicating the policy name, and the policy version, for
instance:
policy_name="Ex Policy" policy_version=0.0.0
The policy version indicates the current version of the policy (NOT the
policy syntax version). This is used to prevent roll-back of policy to
potentially insecure previous versions of the policy.
The next portion of IPE policy, are rules. Rules are formed by key=value
pairs, known as properties. IPE rules require two keys: "action", which
determines what IPE does when it encounters a match against the policy
and "op", which determines when that rule should be evaluated.
Thus, a minimal rule is:
op=EXECUTE action=ALLOW
This example will allow any execution. Additional properties are used to
restrict attributes about the files being evaluated. These properties are
intended to be deterministic attributes that are resident in the kernel.
Available properties for IPE described in the documentation patch of this
series.
A rule is required to have the "op" property as the first token of a rule,
and the "action" as the last token of the rule. Rules are evaluated
top-to-bottom. As a result, any revocation rules, or denies should be
placed early in the file to ensure that these rules are evaluated before
a rule with "action=ALLOW" is hit.
Any unknown syntax in IPE policy will result in a fatal error to parse
the policy. User mode can interrogate the kernel to understand what
properties and the associated versions through the securityfs node,
$securityfs/ipe/config, which will return a string of form:
key1=version1
key2=version2
.
.
.
keyN=versionN
User-mode should correlate these versions with the supported values
identified in the documentation to determine whether a policy should
be accepted by the system without actually trying to deploy the policy.
Additionally, a DEFAULT operation must be set for all understood
operations within IPE. For policies to remain completely forwards
compatible, it is recommended that users add a "DEFAULT action=ALLOW"
and override the defaults on a per-operation basis.
For more information about the policy syntax, see the kernel
documentation page.
Early Usermode Protection:
--------------------------
IPE can be provided with a policy at startup to load and enforce.
This is intended to be a minimal policy to get the system to a state
where userland is setup and ready to receive commands, at which
point a policy can be deployed via securityfs. This "boot policy" can be
specified via the config, SECURITY_IPE_BOOT_POLICY, which accepts a path
to a plain-text version of the IPE policy to apply. This policy will be
compiled into the kernel. If not specified, IPE will be disabled until a
policy is deployed and activated through the method above.
Policy Examples:
----------------
Allow all:
policy_name="Allow All" policy_version=0.0.0
DEFAULT action=ALLOW
Allow only initial superblock:
policy_name="Allow All Initial SB" policy_version=0.0.0
DEFAULT action=DENY
op=EXECUTE boot_verified=TRUE action=ALLOW
Allow any signed dm-verity volume and the initial superblock:
policy_name="AllowSignedAndInitial" policy_version=0.0.0
DEFAULT action=DENY
op=EXECUTE boot_verified=TRUE action=ALLOW
op=EXECUTE dmverity_signature=TRUE action=ALLOW
Prohibit execution from a specific dm-verity volume, while allowing
all signed volumes and the initial superblock:
policy_name="ProhibitSingleVolume" policy_version=0.0.0
DEFAULT action=DENY
op=EXECUTE dmverity_roothash=sha256:401fcec5944823ae12f62726e8184407a5fa9599783f030dec146938 action=DENY
op=EXECUTE boot_verified=TRUE action=ALLOW
op=EXECUTE dmverity_signature=TRUE action=ALLOW
Allow only a specific dm-verity volume:
policy_name="AllowSpecific" policy_version=0.0.0
DEFAULT action=DENY
op=EXECUTE dmverity_roothash=sha256:401fcec5944823ae12f62726e8184407a5fa9599783f030dec146938 action=ALLOW
Deploying Policies:
-------------------
First sign a plain text policy, with a certificate that is present in
the SYSTEM_TRUSTED_KEYRING of your test machine. Through openssl, the
signing can be done via:
openssl smime -sign -in "$MY_POLICY" -signer "$MY_CERTIFICATE" \
-inkey "$MY_PRIVATE_KEY" -outform der -noattr -nodetach \
-out "$MY_POLICY.p7s"
Then, simply cat the file into the IPE's "new_policy" securityfs node:
cat "$MY_POLICY.p7s" > /sys/kernel/security/ipe/new_policy
The policy should now be present under the policies/ subdirectory, under
its "policy_name" attribute.
The policy is now present in the kernel and can be marked as active,
via the securityfs node:
echo 1 > "/sys/kernel/security/ipe/$MY_POLICY_NAME/active"
This will now mark the policy as active and the system will be enforcing
$MY_POLICY_NAME.
There is one requirement when marking a policy as active, the policy_version
attribute must either increase, or remain the same as the currently running
policy.
Policies can be updated via:
cat "$MY_UPDATED_POLICY.p7s" > \
"/sys/kernel/security/ipe/policies/$MY_POLICY_NAME/update"
Additionally, policies can be deleted via the "delete" securityfs
node. Simply write "1" to the corresponding node in the policy folder:
echo 1 > "/sys/kernel/security/ipe/policies/$MY_POLICY_NAME/delete"
There is only one requirement to delete policies, the policy being
deleted must not be the active policy.
NOTE: Any securityfs write to IPE's nodes will require CAP_MAC_ADMIN.
Integrations:
-------------
This patch series adds support for fsverity via digest and signature
(fsverity_signature and fsverity_digest), dm-verity by digest and
signature (dmverity_signature and dmverity_roothash), and trust for
the initramfs (boot_verified).
Please see the documentation patch for more information about the
integrations available.
Testing:
--------
KUnit Tests are available. Recommended kunitconfig:
CONFIG_KUNIT=y
CONFIG_SECURITY=y
CONFIG_SECURITYFS=y
CONFIG_PKCS7_MESSAGE_PARSER=y
CONFIG_SYSTEM_DATA_VERIFICATION=y
CONFIG_FS_VERITY=y
CONFIG_FS_VERITY_BUILTIN_SIGNATURES=y
CONFIG_BLOCK=y
CONFIG_MD=y
CONFIG_BLK_DEV_DM=y
CONFIG_DM_VERITY=y
CONFIG_DM_VERITY_VERIFY_ROOTHASH_SIG=y
CONFIG_SECURITY_IPE=y
CONFIG_SECURITY_IPE_KUNIT_TEST=y
CONFIG_IPE_PROP_BOOT_VERIFIED=y
CONFIG_IPE_PROP_DM_VERITY_SIGNATURE=y
CONFIG_IPE_PROP_DM_VERITY_ROOTHASH=y
CONFIG_IPE_PROP_FS_VERITY_SIGNATURE=y
CONFIG_IPE_PROP_FS_VERITY_DIGEST=y
Simply run:
make ARCH=um mrproper
./tools/testing/kunit/kunit.py run --kunitconfig <path/to/config>
And the tests will execute and report the result. For more indepth testing,
it will require you to create and mount a dm-verity volume or fs-verity
enabled file.
Documentation:
--------------
There is both documentation available on github at
https://microsoft.github.io/ipe, and Documentation in this patch series,
to be added in-tree.
Known Gaps:
-----------
IPE has two known gaps:
1. IPE cannot verify the integrity of anonymous executable memory, such as
the trampolines created by gcc closures and libffi (<3.4.2), or JIT'd code.
Unfortunately, as this is dynamically generated code, there is no way
for IPE to ensure the integrity of this code to form a trust basis. In all
cases, the return result for these operations will be whatever the admin
configures the DEFAULT action for "EXECUTE".
2. IPE cannot verify the integrity of interpreted languages' programs when
these scripts invoked via ``<interpreter> <file>``. This is because the
way interpreters execute these files, the scripts themselves are not
evaluated as executable code through one of IPE's hooks. Interpreters
can be enlightened to the usage of IPE by trying to mmap a file into
executable memory (+X), after opening the file and responding to the
error code appropriately. This also applies to included files, or high
value files, such as configuration files of critical system components.
Appendix:
---------
A. IPE Github Repository: https://github.com/microsoft/ipe
B. IPE Users' Guide: Documentation/admin-guide/LSM/ipe.rst
References:
-----------
1: https://lore.kernel.org/bpf/4d6932e96d774227b42721d9f645ba51@huawei.com/T/
FAQ:
----
Q: What is the difference between IMA and IPE?
A: See the documentation patch for more on this topic.
Previous Postings
-----------------
v1: https://patchwork.kernel.org/project/linux-security-module/list/?series=2...
v2: https://patchwork.kernel.org/project/linux-security-module/list/?series=2...
v3: https://patchwork.kernel.org/project/linux-security-module/list/?series=2...
v4: https://patchwork.kernel.org/project/linux-security-module/list/?series=3...
v5: https://patchwork.kernel.org/project/linux-security-module/list/?series=3...
v6: https://patchwork.kernel.org/project/linux-security-module/list/?series=3...
v7: https://patchwork.kernel.org/project/linux-security-module/list/?series=5...
Changelog:
----------
v2:
Split the second patch of the previous series into two.
Minor corrections in the cover-letter and documentation
comments regarding CAP_MAC_ADMIN checks in IPE.
v3:
Address various comments by Jann Horn. Highlights:
Switch various audit allocators to GFP_KERNEL.
Utilize rcu_access_pointer() in various locations.
Strip out the caching system for properties
Strip comments from headers
Move functions around in patches
Remove kernel command line parameters
Reconcile the race condition on the delete node for policy by
expanding the policy critical section.
Address a few comments by Jonathan Corbet around the documentation
pages for IPE.
Fix an issue with the initialization of IPE policy with a "-0"
version, caused by not initializing the hlist entries before
freeing.
v4:
Address a concern around IPE's behavior with unknown syntax.
Specifically, make any unknown syntax a fatal error instead of a
warning, as suggested by Mickaël Salaün.
Introduce a new securityfs node, $securityfs/ipe/property_config,
which provides a listing of what properties are enabled by the
kernel and their versions. This allows usermode to predict what
policies should be allowed.
Strip some comments from c files that I missed.
Clarify some documentation comments around 'boot_verified'.
While this currently does not functionally change the property
itself, the distinction is important when IPE can enforce verified
reads. Additionally, 'KERNEL_READ' was omitted from the documentation.
This has been corrected.
Change SecurityFS and SHA1 to a reverse dependency.
Update the cover-letter with the updated behavior of unknown syntax.
Remove all sysctls, making an equivalent function in securityfs.
Rework the active/delete mechanism to be a node under the policy in
$securityfs/ipe/policies.
The kernel command line parameters ipe.enforce and ipe.success_audit
have returned as this functionality is no longer exposed through
sysfs.
v5:
Correct some grammatical errors reported by Randy Dunlap.
Fix some warnings reported by kernel test bot.
Change convention around security_bdev_setsecurity. -ENOSYS
is now expected if an LSM does not implement a particular @name,
as suggested by Casey Schaufler.
Minor string corrections related to the move from sysfs to securityfs
Correct a spelling of an #ifdef for the permissive argument.
Add the kernel parameters re-added to the documentation.
Fix a minor bug where the mode being audited on permissive switch
was the original mode, not the mode being swapped to.
Cleanup doc comments, fix some whitespace alignment issues.
v6:
Change if statement condition in security_bdev_setsecurity to be
more concise, as suggested by Casey Schaufler and Al Viro
Drop the 6th patch in the series, "dm-verity move signature check..."
due to numerous issues, and it ultimately providing no real value.
Fix the patch tree - the previous iteration appears to have been in a
torn state (patches 8+9 were merged). This has since been corrected.
v7:
* Reword cover letter to more accurate convey IPE's purpose
and latest updates.
* Refactor series to:
1. Support a context structure, enabling:
1. Easier Testing via KUNIT
2. A better architecture for future designs
2. Make parser code cleaner
* Move patch 01/12 to [14/16] of the series
* Split up patch 02/12 into four parts:
1. context creation [01/16]
2. audit [07/16]
3. evaluation loop [03/16]
4. access control hooks [05/16]
5. permissive mode [08/16]
* Split up patch 03/12 into two parts:
1. parser [02/16]
2. userspace interface [04/16]
* Reword and refactor patch 04/12 to [09/16]
* Squash patch 05/12, 07/12, 09/12 to [10/16]
* Squash patch 08/12, 10/12 to [11/16]
* Change audit records to MAC region (14XX) from Integrity region (18XX)
* Add FSVerity Support
* Interface changes:
1. "raw" was renamed to "pkcs7" and made read only
2. "raw"'s write functionality (update a policy) moved to "update"
3. introduced "version", "policy_name" nodes.
4. "content" renamed to "policy"
5. The boot policy can now be updated like any other policy.
* Add additional developer-level documentation
* Update admin-guide docs to reflect changes.
* Kunit tests
* Dropped CONFIG_SECURITY_IPE_PERMISSIVE_SWITCH - functionality can
easily come later with a small patch.
* Use partition0 for block_device for dm-verity patch
v8:
* Add changelog information to individual commits
* A large number of changes to the audit patch.
* split fs/ & security/ changes to two separate patches.
* split block/, security/ & drivers/md/ changes to separate patches.
* Add some historical context to what lead to the creation of IPE
in the documentation patch.
* Cover-letter changes suggested by Roberto Sassu.
Deven Bowers (15):
security: add ipe lsm & initial context creation
ipe: add policy parser
ipe: add evaluation loop
ipe: add userspace interface
ipe: add LSM hooks on execution and kernel read
uapi|audit: add ipe audit message definitions
ipe: add auditing support
ipe: add permissive toggle
ipe: introduce 'boot_verified' as a trust provider
block|security: add LSM blob to block_device
dm-verity: consume root hash digest and signature data via LSM hook
ipe: add support for dm-verity as a trust provider
scripts: add boot policy generation program
ipe: kunit tests
documentation: add ipe documentation
Fan Wu (2):
fsverity: consume builtin signature via LSM hook
ipe: enable support for fs-verity as a trust provider
Documentation/admin-guide/LSM/index.rst | 1 +
Documentation/admin-guide/LSM/ipe.rst | 739 ++++++++++++
.../admin-guide/kernel-parameters.txt | 12 +
Documentation/security/index.rst | 1 +
Documentation/security/ipe.rst | 559 +++++++++
MAINTAINERS | 9 +
block/bdev.c | 7 +
drivers/md/dm-verity-target.c | 25 +-
drivers/md/dm-verity-verify-sig.c | 16 +-
drivers/md/dm-verity-verify-sig.h | 10 +-
fs/verity/fsverity_private.h | 2 +-
fs/verity/open.c | 13 +-
fs/verity/signature.c | 1 +
include/asm-generic/vmlinux.lds.h | 16 +
include/linux/blk_types.h | 1 +
include/linux/dm-verity.h | 19 +
include/linux/fsverity.h | 2 +
include/linux/lsm_hook_defs.h | 5 +
include/linux/lsm_hooks.h | 12 +
include/linux/security.h | 22 +
include/uapi/linux/audit.h | 1 +
scripts/Makefile | 1 +
scripts/ipe/Makefile | 2 +
scripts/ipe/polgen/.gitignore | 1 +
scripts/ipe/polgen/Makefile | 6 +
scripts/ipe/polgen/polgen.c | 145 +++
security/Kconfig | 11 +-
security/Makefile | 1 +
security/ipe/.gitignore | 1 +
security/ipe/Kconfig | 101 ++
security/ipe/Makefile | 37 +
security/ipe/audit.c | 227 ++++
security/ipe/audit.h | 39 +
security/ipe/ctx.c | 368 ++++++
security/ipe/ctx.h | 43 +
security/ipe/ctx_test.c | 718 ++++++++++++
security/ipe/eval.c | 240 ++++
security/ipe/eval.h | 52 +
security/ipe/fs.c | 340 ++++++
security/ipe/fs.h | 13 +
security/ipe/hooks.c | 298 +++++
security/ipe/hooks.h | 45 +
security/ipe/ipe.c | 159 +++
security/ipe/ipe.h | 28 +
security/ipe/ipe_parser.h | 59 +
security/ipe/modules.c | 272 +++++
security/ipe/modules.h | 17 +
security/ipe/modules/Kconfig | 66 ++
security/ipe/modules/Makefile | 12 +
security/ipe/modules/boot_verified.c | 26 +
security/ipe/modules/dmverity_roothash.c | 31 +
security/ipe/modules/dmverity_signature.c | 26 +
security/ipe/modules/fsverity_digest.c | 39 +
security/ipe/modules/fsverity_signature.c | 34 +
security/ipe/modules/ipe_module.h | 46 +
security/ipe/parsers.c | 143 +++
security/ipe/parsers/Makefile | 12 +
security/ipe/parsers/default.c | 106 ++
security/ipe/parsers/policy_header.c | 126 ++
security/ipe/policy.c | 1037 +++++++++++++++++
security/ipe/policy.h | 113 ++
security/ipe/policy_parser_tests.c | 313 +++++
security/ipe/policyfs.c | 528 +++++++++
security/security.c | 70 ++
64 files changed, 7409 insertions(+), 16 deletions(-)
create mode 100644 Documentation/admin-guide/LSM/ipe.rst
create mode 100644 Documentation/security/ipe.rst
create mode 100644 include/linux/dm-verity.h
create mode 100644 scripts/ipe/Makefile
create mode 100644 scripts/ipe/polgen/.gitignore
create mode 100644 scripts/ipe/polgen/Makefile
create mode 100644 scripts/ipe/polgen/polgen.c
create mode 100644 security/ipe/.gitignore
create mode 100644 security/ipe/Kconfig
create mode 100644 security/ipe/Makefile
create mode 100644 security/ipe/audit.c
create mode 100644 security/ipe/audit.h
create mode 100644 security/ipe/ctx.c
create mode 100644 security/ipe/ctx.h
create mode 100644 security/ipe/ctx_test.c
create mode 100644 security/ipe/eval.c
create mode 100644 security/ipe/eval.h
create mode 100644 security/ipe/fs.c
create mode 100644 security/ipe/fs.h
create mode 100644 security/ipe/hooks.c
create mode 100644 security/ipe/hooks.h
create mode 100644 security/ipe/ipe.c
create mode 100644 security/ipe/ipe.h
create mode 100644 security/ipe/ipe_parser.h
create mode 100644 security/ipe/modules.c
create mode 100644 security/ipe/modules.h
create mode 100644 security/ipe/modules/Kconfig
create mode 100644 security/ipe/modules/Makefile
create mode 100644 security/ipe/modules/boot_verified.c
create mode 100644 security/ipe/modules/dmverity_roothash.c
create mode 100644 security/ipe/modules/dmverity_signature.c
create mode 100644 security/ipe/modules/fsverity_digest.c
create mode 100644 security/ipe/modules/fsverity_signature.c
create mode 100644 security/ipe/modules/ipe_module.h
create mode 100644 security/ipe/parsers.c
create mode 100644 security/ipe/parsers/Makefile
create mode 100644 security/ipe/parsers/default.c
create mode 100644 security/ipe/parsers/policy_header.c
create mode 100644 security/ipe/policy.c
create mode 100644 security/ipe/policy.h
create mode 100644 security/ipe/policy_parser_tests.c
create mode 100644 security/ipe/policyfs.c
--
2.25.1
2 years, 2 months
[PATCH] audit, io_uring, io-wq: Fix memory leak in io_sq_thread() and io_wqe_worker()
by Peilin Ye
From: Peilin Ye <peilin.ye(a)bytedance.com>
Currently @audit_context is allocated twice for io_uring workers:
1. copy_process() calls audit_alloc();
2. io_sq_thread() or io_wqe_worker() calls audit_alloc_kernel() (which
is effectively audit_alloc()) and overwrites @audit_context,
causing:
BUG: memory leak
unreferenced object 0xffff888144547400 (size 1024):
<...>
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff8135cfc3>] audit_alloc+0x133/0x210
[<ffffffff81239e63>] copy_process+0xcd3/0x2340
[<ffffffff8123b5f3>] create_io_thread+0x63/0x90
[<ffffffff81686604>] create_io_worker+0xb4/0x230
[<ffffffff81686f68>] io_wqe_enqueue+0x248/0x3b0
[<ffffffff8167663a>] io_queue_iowq+0xba/0x200
[<ffffffff816768b3>] io_queue_async+0x113/0x180
[<ffffffff816840df>] io_req_task_submit+0x18f/0x1a0
[<ffffffff816841cd>] io_apoll_task_func+0xdd/0x120
[<ffffffff8167d49f>] tctx_task_work+0x11f/0x570
[<ffffffff81272c4e>] task_work_run+0x7e/0xc0
[<ffffffff8125a688>] get_signal+0xc18/0xf10
[<ffffffff8111645b>] arch_do_signal_or_restart+0x2b/0x730
[<ffffffff812ea44e>] exit_to_user_mode_prepare+0x5e/0x180
[<ffffffff844ae1b2>] syscall_exit_to_user_mode+0x12/0x20
[<ffffffff844a7e80>] do_syscall_64+0x40/0x80
Then,
3. io_sq_thread() or io_wqe_worker() frees @audit_context using
audit_free();
4. do_exit() eventually calls audit_free() again, which is okay
because audit_free() does a NULL check.
Free the old @audit_context first in audit_alloc_kernel(), and delete
the redundant calls to audit_free() for less confusion.
Fixes: 5bd2182d58e9 ("audit,io_uring,io-wq: add some basic audit support to io_uring")
Cc: stable(a)vger.kernel.org
Signed-off-by: Peilin Ye <peilin.ye(a)bytedance.com>
---
Hi all,
A better way to fix this memleak would probably be checking
@args->io_thread in copy_process()? Something like:
if (args->io_thread)
retval = audit_alloc_kernel();
else
retval = audit_alloc();
But I didn't want to add another if to copy_process() for this bugfix.
Please suggest, thanks!
Peilin Ye
fs/io-wq.c | 1 -
fs/io_uring.c | 2 --
kernel/auditsc.c | 1 +
3 files changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/io-wq.c b/fs/io-wq.c
index 824623bcf1a5..0f4804a5e873 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -670,7 +670,6 @@ static int io_wqe_worker(void *data)
if (test_bit(IO_WQ_BIT_EXIT, &wq->state))
io_worker_handle_work(worker);
- audit_free(current);
io_worker_exit(worker);
return 0;
}
diff --git a/fs/io_uring.c b/fs/io_uring.c
index e8e769be9ed0..0f27914f37f2 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9283,8 +9283,6 @@ static int io_sq_thread(void *data)
io_run_task_work();
mutex_unlock(&sqd->lock);
- audit_free(current);
-
complete(&sqd->exited);
do_exit(0);
}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3a8c9d744800..7948090fd12f 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1095,6 +1095,7 @@ int audit_alloc_kernel(struct task_struct *tsk)
* 2. The {set,clear}_task_syscall_work() ops likely have zero effect
* on these internal kernel tasks, but they probably don't hurt either.
*/
+ __audit_free(current);
return audit_alloc(tsk);
}
--
2.20.1
2 years, 2 months
[GIT PULL] Audit patches for v6.0
by Paul Moore
Linus,
Two minor audit patches: on marks a function as static, the other
removes a redundant length check. Everything merges cleanly against
your tree of a few minutes ago, please merge for v6.0.
-Paul
--
The following changes since commit f2906aa863381afb0015a9eb7fefad885d4e5a56:
Linux 5.19-rc1 (2022-06-05 17:18:54 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git
tags/audit-pr-20220801
for you to fetch changes up to 546093206ba16623c18e344630dbfdd71a4327e0:
audit: make is_audit_feature_set() static (2022-06-13 14:08:57 -0400)
----------------------------------------------------------------
audit/stable-6.0 PR 20220801
----------------------------------------------------------------
Shreenidhi Shedi (1):
audit: remove redundant data_len check
Xiu Jianfeng (1):
audit: make is_audit_feature_set() static
include/linux/audit.h | 2 --
kernel/audit.c | 4 ++--
2 files changed, 2 insertions(+), 4 deletions(-)
--
paul-moore.com
2 years, 3 months
