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selinux_set_mnt_opts() relies on the fact that the mount options pointer
is always NULL when all options are unset (specifically in its
!selinux_initialized() branch. However, the new
selinux_fs_context_submount() hook breaks this rule by allocating a new
structure even if no options are set. That causes any submount created
before a SELinux policy is loaded to be rejected in
selinux_set_mnt_opts().
Fix this by making selinux_fs_context_submount() leave fc->security
set to NULL when there are no options to be copied from the reference
superblock.
Cc: <stable@vger.kernel.org>
Reported-by: Adam Williamson <awilliam@redhat.com>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2236345
Fixes: d80a8f1b58c2 ("vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux
Pull landlock updates from Mickaël Salaün:
"One test fix and a __counted_by annotation"
* tag 'landlock-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux:
selftests/landlock: Fix a resource leak
landlock: Annotate struct landlock_rule with __counted_by
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Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct landlock_rule.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Paul Moore <paul@paul-moore.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: linux-security-module@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817210257.never.920-kees@kernel.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>
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Pull tomoyo updates from Tetsuo Handa:
"Three cleanup patches, no behavior changes"
* tag 'tomoyo-pr-20230903' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1:
tomoyo: remove unused function declaration
tomoyo: refactor deprecated strncpy
tomoyo: add format attributes to functions
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The last usage of tomoyo_check_flags() has been removed by commit
57c2590fb7fd ("TOMOYO: Update profile structure."). Clean up its
residual declaration.
Signed-off-by: GONG, Ruiqi <gongruiqi1@huawei.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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`strncpy` is deprecated for use on NUL-terminated destination strings [1].
A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on its destination buffer argument which is
_not_ the case for `strncpy`!
It should be noted that the destination buffer is zero-initialized and
had a max length of `sizeof(dest) - 1`. There is likely _not_ a bug
present in the current implementation. However, by switching to
`strscpy` we get the benefit of no longer needing the `- 1`'s from the
string copy invocations on top of `strscpy` being a safer interface all
together.
[1]: www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
[2]: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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Format attributes on functions taking format string can help compilers
detect argument type or count mismatches.
Please the compiler when building with W=1:
security/tomoyo/audit.c: In function ‘tomoyo_init_log’:
security/tomoyo/audit.c:290:9: error: function ‘tomoyo_init_log’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
290 | vsnprintf(buf + pos, len - pos, fmt, args);
| ^~~~~~~~~
security/tomoyo/audit.c: In function ‘tomoyo_write_log2’:
security/tomoyo/audit.c:376:9: error: function ‘tomoyo_write_log2’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
376 | buf = tomoyo_init_log(r, len, fmt, args);
| ^~~
security/tomoyo/common.c: In function ‘tomoyo_addprintf’:
security/tomoyo/common.c:193:9: error: function ‘tomoyo_addprintf’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
193 | vsnprintf(buffer + pos, len - pos - 1, fmt, args);
| ^~~~~~~~~
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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Pull smack updates from Casey Schaufler:
"Two minor fixes: is a simple spelling fix. The other is a bounds check
for a very likely underflow"
* tag 'Smack-for-6.6' of https://github.com/cschaufler/smack-next:
smackfs: Prevent underflow in smk_set_cipso()
security: smack: smackfs: fix typo (lables->labels)
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There is a upper bound to "catlen" but no lower bound to prevent
negatives. I don't see that this necessarily causes a problem but we
may as well be safe.
Fixes: e114e473771c ("Smack: Simplified Mandatory Access Control Kernel")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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Fix a spelling error in smakcfs.
Signed-off-by: Tóth János <gomba007@gmail.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity
Pull integrity subsystem updates from Mimi Zohar:
- With commit 099f26f22f58 ("integrity: machine keyring CA
configuration") certificates may be loaded onto the IMA keyring,
directly or indirectly signed by keys on either the "builtin" or the
"machine" keyrings.
With the ability for the system/machine owner to sign the IMA policy
itself without needing to recompile the kernel, update the IMA
architecture specific policy rules to require the IMA policy itself
be signed.
[ As commit 099f26f22f58 was upstreamed in linux-6.4, updating the
IMA architecture specific policy now to require signed IMA policies
may break userspace expectations. ]
- IMA only checked the file data hash was not on the system blacklist
keyring for files with an appended signature (e.g. kernel modules,
Power kernel image).
Check all file data hashes regardless of how it was signed
- Code cleanup, and a kernel-doc update
* tag 'integrity-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
kexec_lock: Replace kexec_mutex() by kexec_lock() in two comments
ima: require signed IMA policy when UEFI secure boot is enabled
integrity: Always reference the blacklist keyring with appraisal
ima: Remove deprecated IMA_TRUSTED_KEYRING Kconfig
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kexec_mutex is replaced by an atomic variable
in 05c6257433b (panic, kexec: make __crash_kexec() NMI safe).
But there are still two comments that referenced kexec_mutex,
replace them by kexec_lock.
Signed-off-by: Wenyu Liu <liuwenyu7@huawei.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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With commit 099f26f22f58 ("integrity: machine keyring CA
configuration"), users are able to add custom IMA CA keys via
MOK. This allows users to sign their own IMA polices without
recompiling the kernel. For the sake of security, mandate signed IMA
policy when UEFI secure boot is enabled.
Note this change may affect existing users/tests i.e users won't be able
to load an unsigned IMA policy when the IMA architecture specific policy
is configured and UEFI secure boot is enabled.
Suggested-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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Commit 273df864cf746 ("ima: Check against blacklisted hashes for files with
modsig") introduced an appraise_flag option for referencing the blacklist
keyring. Any matching binary found on this keyring fails signature
validation. This flag only works with module appended signatures.
An important part of a PKI infrastructure is to have the ability to do
revocation at a later time should a vulnerability be found. Expand the
revocation flag usage to all appraisal functions. The flag is now
enabled by default. Setting the flag with an IMA policy has been
deprecated. Without a revocation capability like this in place, only
authenticity can be maintained. With this change, integrity can now be
achieved with digital signature based IMA appraisal.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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Time to remove "IMA_TRUSTED_KEYRING".
Fixes: f4dc37785e9b ("integrity: define '.evm' as a builtin 'trusted' keyring") # v4.5+
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Pull LSM updates from Paul Moore:
- Add proper multi-LSM support for xattrs in the
security_inode_init_security() hook
Historically the LSM layer has only allowed a single LSM to add an
xattr to an inode, with IMA/EVM measuring that and adding its own as
well. As we work towards promoting IMA/EVM to a "proper LSM" instead
of the special case that it is now, we need to better support the
case of multiple LSMs each adding xattrs to an inode and after
several attempts we now appear to have something that is working
well. It is worth noting that in the process of making this change we
uncovered a problem with Smack's SMACK64TRANSMUTE xattr which is also
fixed in this pull request.
- Additional LSM hook constification
Two patches to constify parameters to security_capget() and
security_binder_transfer_file(). While I generally don't make a
special note of who submitted these patches, these were the work of
an Outreachy intern, Khadija Kamran, and that makes me happy;
hopefully it does the same for all of you reading this.
- LSM hook comment header fixes
One patch to add a missing hook comment header, one to fix a minor
typo.
- Remove an old, unused credential function declaration
It wasn't clear to me who should pick this up, but it was trivial,
obviously correct, and arguably the LSM layer has a vested interest
in credentials so I merged it. Sadly I'm now noticing that despite my
subject line cleanup I didn't cleanup the "unsued" misspelling, sigh
* tag 'lsm-pr-20230829' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm:
lsm: constify the 'file' parameter in security_binder_transfer_file()
lsm: constify the 'target' parameter in security_capget()
lsm: add comment block for security_sk_classify_flow LSM hook
security: Fix ret values doc for security_inode_init_security()
cred: remove unsued extern declaration change_create_files_as()
evm: Support multiple LSMs providing an xattr
evm: Align evm_inode_init_security() definition with LSM infrastructure
smack: Set the SMACK64TRANSMUTE xattr in smack_inode_init_security()
security: Allow all LSMs to provide xattrs for inode_init_security hook
lsm: fix typo in security_file_lock() comment header
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SELinux registers the implementation for the "binder_transfer_file"
hook. Looking at the function implementation we observe that the
parameter "file" is not changing.
Mark the "file" parameter of LSM hook security_binder_transfer_file() as
"const" since it will not be changing in the LSM hook.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
[PM: subject line whitespace fix]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Three LSMs register the implementations for the "capget" hook: AppArmor,
SELinux, and the normal capability code. Looking at the function
implementations we may observe that the first parameter "target" is not
changing.
Mark the first argument "target" of LSM hook security_capget() as
"const" since it will not be changing in the LSM hook.
cap_capget() LSM hook declaration exceeds the 80 characters per line
limit. Split the function declaration to multiple lines to decrease the
line length.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
Acked-by: John Johansen <john.johansen@canonical.com>
[PM: align the cap_capget() declaration, spelling fixes]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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security_sk_classify_flow LSM hook has no comment block. Add a comment
block with a brief description of LSM hook and its function parameters.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
[PM: minor double-space fix]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Commit 6bcdfd2cac55 ("security: Allow all LSMs to provide xattrs for
inode_init_security hook") unified the !initxattrs and initxattrs cases. By
doing that, security_inode_init_security() cannot return -EOPNOTSUPP
anymore, as it is always replaced with zero at the end of the function.
Also, mentioning -ENOMEM as the only possible error is not correct. For
example, evm_inode_init_security() could return -ENOKEY.
Fix these issues in the documentation of security_inode_init_security().
Fixes: 6bcdfd2cac55 ("security: Allow all LSMs to provide xattrs for inode_init_security hook")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Currently, evm_inode_init_security() processes a single LSM xattr from the
array passed by security_inode_init_security(), and calculates the HMAC on
it and other inode metadata.
As the LSM infrastructure now can pass to EVM an array with multiple
xattrs, scan them until the terminator (xattr name NULL), and calculate the
HMAC on all of them.
Also, double check that the xattrs array terminator is the first non-filled
slot (obtained with lsm_get_xattr_slot()). Consumers of the xattrs array,
such as the initxattrs() callbacks, rely on the terminator.
Finally, change the name of the lsm_xattr parameter of evm_init_hmac() to
xattrs, to reflect the new type of information passed.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Change the evm_inode_init_security() definition to align with the LSM
infrastructure. Keep the existing behavior of including in the HMAC
calculation only the first xattr provided by LSMs.
Changing the evm_inode_init_security() definition requires passing the
xattr array allocated by security_inode_init_security(), and the number of
xattrs filled by previously invoked LSMs.
Use the newly introduced lsm_get_xattr_slot() to position EVM correctly in
the xattrs array, like a regular LSM, and to increment the number of filled
slots. For now, the LSM infrastructure allocates enough xattrs slots to
store the EVM xattr, without using the reservation mechanism.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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With the newly added ability of LSMs to supply multiple xattrs, set
SMACK64TRASMUTE in smack_inode_init_security(), instead of d_instantiate().
Do it by incrementing SMACK_INODE_INIT_XATTRS to 2 and by calling
lsm_get_xattr_slot() a second time, if the transmuting conditions are met.
The LSM infrastructure passes all xattrs provided by LSMs to the
filesystems through the initxattrs() callback, so that filesystems can
store xattrs in the disk.
After the change, the SMK_INODE_TRANSMUTE inode flag is always set by
d_instantiate() after fetching SMACK64TRANSMUTE from the disk. Before it
was done by smack_inode_post_setxattr() as result of the __vfs_setxattr()
call.
Removing __vfs_setxattr() also prevents invalidating the EVM HMAC, by
adding a new xattr without checking and updating the existing HMAC.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Currently, the LSM infrastructure supports only one LSM providing an xattr
and EVM calculating the HMAC on that xattr, plus other inode metadata.
Allow all LSMs to provide one or multiple xattrs, by extending the security
blob reservation mechanism. Introduce the new lbs_xattr_count field of the
lsm_blob_sizes structure, so that each LSM can specify how many xattrs it
needs, and the LSM infrastructure knows how many xattr slots it should
allocate.
Modify the inode_init_security hook definition, by passing the full
xattr array allocated in security_inode_init_security(), and the current
number of xattr slots in that array filled by LSMs. The first parameter
would allow EVM to access and calculate the HMAC on xattrs supplied by
other LSMs, the second to not leave gaps in the xattr array, when an LSM
requested but did not provide xattrs (e.g. if it is not initialized).
Introduce lsm_get_xattr_slot(), which LSMs can call as many times as the
number specified in the lbs_xattr_count field of the lsm_blob_sizes
structure. During each call, lsm_get_xattr_slot() increments the number of
filled xattrs, so that at the next invocation it returns the next xattr
slot to fill.
Cleanup security_inode_init_security(). Unify the !initxattrs and
initxattrs case by simply not allocating the new_xattrs array in the
former. Update the documentation to reflect the changes, and fix the
description of the xattr name, as it is not allocated anymore.
Adapt both SELinux and Smack to use the new definition of the
inode_init_security hook, and to call lsm_get_xattr_slot() to obtain and
fill the reserved slots in the xattr array.
Move the xattr->name assignment after the xattr->value one, so that it is
done only in case of successful memory allocation.
Finally, change the default return value of the inode_init_security hook
from zero to -EOPNOTSUPP, so that BPF LSM correctly follows the hook
conventions.
Reported-by: Nicolas Bouchinet <nicolas.bouchinet@clip-os.org>
Link: https://lore.kernel.org/linux-integrity/Y1FTSIo+1x+4X0LS@archlinux/
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
[PM: minor comment and variable tweaks, approved by RS]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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In the description of function definition security_file_lock(),
the line "@cmd: fnctl command" has a typo where "fnctl" should be
"fcntl". This patch fixes the typo.
Signed-off-by: Pairman Guo <pairmanxlr@gmail.com>
[PM: commit message cleanup]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux
Pull selinux updates from Paul Moore:
"Thirty three SELinux patches, which is a pretty big number for us, but
there isn't really anything scary in here; in fact we actually manage
to remove 10 lines of code with this :)
- Promote the SELinux DEBUG_HASHES macro to CONFIG_SECURITY_SELINUX_DEBUG
The DEBUG_HASHES macro was a buried SELinux specific preprocessor
debug macro that was a problem waiting to happen. Promoting the
debug macro to a proper Kconfig setting should help both improve
the visibility of the feature as well enable improved test
coverage. We've moved some additional debug functions under the
CONFIG_SECURITY_SELINUX_DEBUG flag and we may see more work in the
future.
- Emit a pr_notice() message if virtual memory is executable by default
As this impacts the SELinux access control policy enforcement, if
the system's configuration is such that virtual memory is
executable by default we print a single line notice to the console.
- Drop avtab_search() in favor of avtab_search_node()
Both functions are nearly identical so we removed avtab_search()
and converted the callers to avtab_search_node().
- Add some SELinux network auditing helpers
The helpers not only reduce a small amount of code duplication, but
they provide an opportunity to improve UDP flood performance
slightly by delaying initialization of the audit data in some
cases.
- Convert GFP_ATOMIC allocators to GFP_KERNEL when reading SELinux policy
There were two SELinux policy load helper functions that were
allocating memory using GFP_ATOMIC, they have been converted to
GFP_KERNEL.
- Quiet a KMSAN warning in selinux_inet_conn_request()
A one-line error path (re)set patch that resolves a KMSAN warning.
It is important to note that this doesn't represent a real bug in
the current code, but it quiets KMSAN and arguably hardens the code
against future changes.
- Cleanup the policy capability accessor functions
This is a follow-up to the patch which reverted SELinux to using a
global selinux_state pointer. This patch cleans up some artifacts
of that change and turns each accessor into a one-line READ_ONCE()
call into the policy capabilities array.
- A number of patches from Christian Göttsche
Christian submitted almost two-thirds of the patches in this pull
request as he worked to harden the SELinux code against type
differences, variable overflows, etc.
- Support for separating early userspace from the kernel in policy,
with a later revert
We did have a patch that added a new userspace initial SID which
would allow SELinux to distinguish between early user processes
created before the initial policy load and the kernel itself.
Unfortunately additional post-merge testing revealed a problematic
interaction with an old SELinux userspace on an old version of
Ubuntu so we've reverted the patch until we can resolve the
compatibility issue.
- Remove some outdated comments dealing with LSM hook registration
When we removed the runtime disable functionality we forgot to
remove some old comments discussing the importance of LSM hook
registration ordering.
- Minor administrative changes
Stephen Smalley updated his email address and "debranded" SELinux
from "NSA SELinux" to simply "SELinux". We've come a long way from
the original NSA submission and I would consider SELinux a true
community project at this point so removing the NSA branding just
makes sense"
* tag 'selinux-pr-20230829' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux: (33 commits)
selinux: prevent KMSAN warning in selinux_inet_conn_request()
selinux: use unsigned iterator in nlmsgtab code
selinux: avoid implicit conversions in policydb code
selinux: avoid implicit conversions in selinuxfs code
selinux: make left shifts well defined
selinux: update type for number of class permissions in services code
selinux: avoid implicit conversions in avtab code
selinux: revert SECINITSID_INIT support
selinux: use GFP_KERNEL while reading binary policy
selinux: update comment on selinux_hooks[]
selinux: avoid implicit conversions in services code
selinux: avoid implicit conversions in mls code
selinux: use identical iterator type in hashtab_duplicate()
selinux: move debug functions into debug configuration
selinux: log about VM being executable by default
selinux: fix a 0/NULL mistmatch in ad_net_init_from_iif()
selinux: introduce SECURITY_SELINUX_DEBUG configuration
selinux: introduce and use lsm_ad_net_init*() helpers
selinux: update my email address
selinux: add missing newlines in pr_err() statements
...
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KMSAN reports the following issue:
[ 81.822503] =====================================================
[ 81.823222] BUG: KMSAN: uninit-value in selinux_inet_conn_request+0x2c8/0x4b0
[ 81.823891] selinux_inet_conn_request+0x2c8/0x4b0
[ 81.824385] security_inet_conn_request+0xc0/0x160
[ 81.824886] tcp_v4_route_req+0x30e/0x490
[ 81.825343] tcp_conn_request+0xdc8/0x3400
[ 81.825813] tcp_v4_conn_request+0x134/0x190
[ 81.826292] tcp_rcv_state_process+0x1f4/0x3b40
[ 81.826797] tcp_v4_do_rcv+0x9ca/0xc30
[ 81.827236] tcp_v4_rcv+0x3bf5/0x4180
[ 81.827670] ip_protocol_deliver_rcu+0x822/0x1230
[ 81.828174] ip_local_deliver_finish+0x259/0x370
[ 81.828667] ip_local_deliver+0x1c0/0x450
[ 81.829105] ip_sublist_rcv+0xdc1/0xf50
[ 81.829534] ip_list_rcv+0x72e/0x790
[ 81.829941] __netif_receive_skb_list_core+0x10d5/0x1180
[ 81.830499] netif_receive_skb_list_internal+0xc41/0x1190
[ 81.831064] napi_complete_done+0x2c4/0x8b0
[ 81.831532] e1000_clean+0x12bf/0x4d90
[ 81.831983] __napi_poll+0xa6/0x760
[ 81.832391] net_rx_action+0x84c/0x1550
[ 81.832831] __do_softirq+0x272/0xa6c
[ 81.833239] __irq_exit_rcu+0xb7/0x1a0
[ 81.833654] irq_exit_rcu+0x17/0x40
[ 81.834044] common_interrupt+0x8d/0xa0
[ 81.834494] asm_common_interrupt+0x2b/0x40
[ 81.834949] default_idle+0x17/0x20
[ 81.835356] arch_cpu_idle+0xd/0x20
[ 81.835766] default_idle_call+0x43/0x70
[ 81.836210] do_idle+0x258/0x800
[ 81.836581] cpu_startup_entry+0x26/0x30
[ 81.837002] __pfx_ap_starting+0x0/0x10
[ 81.837444] secondary_startup_64_no_verify+0x17a/0x17b
[ 81.837979]
[ 81.838166] Local variable nlbl_type.i created at:
[ 81.838596] selinux_inet_conn_request+0xe3/0x4b0
[ 81.839078] security_inet_conn_request+0xc0/0x160
KMSAN warning is reproducible with:
* netlabel_mgmt_protocount is 0 (e.g. netlbl_enabled() returns 0)
* CONFIG_SECURITY_NETWORK_XFRM may be set or not
* CONFIG_KMSAN=y
* `ssh USER@HOSTNAME /bin/date`
selinux_skb_peerlbl_sid() will call selinux_xfrm_skb_sid(), then fall
to selinux_netlbl_skbuff_getsid() which will not initialize nlbl_type,
but it will be passed to:
err = security_net_peersid_resolve(nlbl_sid,
nlbl_type, xfrm_sid, sid);
and checked by KMSAN, although it will not be used inside
security_net_peersid_resolve() (at least now), since this function
will check either (xfrm_sid == SECSID_NULL) or (nlbl_sid ==
SECSID_NULL) first and return before using uninitialized nlbl_type.
Signed-off-by: Andrew Kanner <andrew.kanner@gmail.com>
[PM: subject line tweak, removed 'fixes' tag as code is not broken]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use an unsigned type as loop iterator.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use the identical type for local variables, e.g. loop counters.
Declare members of struct policydb_compat_info unsigned to consistently
use unsigned iterators. They hold read-only non-negative numbers in the
global variable policydb_compat.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use umode_t as parameter type for sel_make_inode(), which assigns the
value to the member i_mode of struct inode.
Use identical and unsigned types for loop iterators.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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The loops upper bound represent the number of permissions used (for the
current class or in general). The limit for this is 32, thus we might
left shift of one less, 31. Shifting a base of 1 results in undefined
behavior; use (u32)1 as base.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Security classes have only up to 32 permissions, hence using an u16 is
sufficient (while improving padding in struct selinux_mapping).
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Return u32 from avtab_hash() instead of int, since the hashing is done
on u32 and the result is used as an index on the hash array.
Use the type of the limit in for loops.
Avoid signed to unsigned conversion of multiplication result in
avtab_hash_eval() and perform multiplication in destination type.
Use unsigned loop iterator for index operations, to avoid sign
extension.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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This commit reverts 5b0eea835d4e ("selinux: introduce an initial SID
for early boot processes") as it was found to cause problems on
distros with old SELinux userspace tools/libraries, specifically
Ubuntu 16.04.
Hopefully we will be able to re-add this functionality at a later
date, but let's revert this for now to help ensure a stable and
backwards compatible SELinux tree.
Link: https://lore.kernel.org/selinux/87edkseqf8.fsf@mail.lhotse
Acked-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use GFP_KERNEL instead of GFP_ATOMIC while reading a binary policy in
sens_read() and cat_read(), similar to surrounding code.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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After commit f22f9aaf6c3d ("selinux: remove the runtime disable
functionality"), the comment on selinux_hooks[] is out-of-date,
remove the last paragraph about runtime disable functionality.
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use u32 as the output parameter type in security_get_classes() and
security_get_permissions(), based on the type of the symtab nprim
member.
Declare the read-only class string parameter of
security_get_permissions() const.
Avoid several implicit conversions by using the identical type for the
destination.
Use the type identical to the source for local variables.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: cleanup extra whitespace in subject]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use u32 for ebitmap bits and sensitivity levels, char for the default
range of a class.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: description tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use the identical type u32 for the loop iterator.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: remove extra whitespace in subject]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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avtab_hash_eval() and hashtab_stat() are only used in policydb.c when
the configuration SECURITY_SELINUX_DEBUG is enabled.
Move the function definitions under that configuration as well and
provide empty definitions in case SECURITY_SELINUX_DEBUG is disabled, to
avoid using #ifdef in the callers.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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In case virtual memory is being marked as executable by default, SELinux
checks regarding explicit potential dangerous use are disabled.
Inform the user about it.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use a NULL instead of a zero to resolve a int/pointer mismatch.
Cc: Paolo Abeni <pabeni@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307210332.4AqFZfzI-lkp@intel.com/
Fixes: dd51fcd42fd6 ("selinux: introduce and use lsm_ad_net_init*() helpers")
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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The policy database code contains several debug output statements
related to hashtable utilization. Those are guarded by the macro
DEBUG_HASHES, which is neither documented nor set anywhere.
Introduce a new Kconfig configuration guarding this and potential
other future debugging related code. Disable the setting by default.
Suggested-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: fixed line lengths in the help text]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Perf traces of network-related workload shows a measurable overhead
inside the network-related selinux hooks while zeroing the
lsm_network_audit struct.
In most cases we can delay the initialization of such structure to the
usage point, avoiding such overhead in a few cases.
Additionally, the audit code accesses the IP address information only
for AF_INET* families, and selinux_parse_skb() will fill-out the
relevant fields in such cases. When the family field is zeroed or the
initialization is followed by the mentioned parsing, the zeroing can be
limited to the sk, family and netif fields.
By factoring out the audit-data initialization to new helpers, this
patch removes some duplicate code and gives small but measurable
performance gain under UDP flood.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Update my email address; MAINTAINERS was updated some time ago.
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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The kernel print statements do not append an implicit newline to format
strings.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: subject line tweak]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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avtab_search() shares the same logic with avtab_search_node(), except
that it returns, if found, a pointer to the struct avtab_node member
datum instead of the node itself. Since the member is an embedded
struct, and not a pointer, the returned value of avtab_search() and
avtab_search_node() will always in unison either be NULL or non-NULL.
Drop avtab_search() and replace its calls by avtab_search_node() to
deduplicate logic and adopt the only caller caring for the type of
the returned value accordingly.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Change "NSA SELinux" to just "SELinux" in Kconfig help text and
comments. While NSA was the original primary developer and continues to
help maintain SELinux, SELinux has long since transitioned to a wide
community of developers and maintainers. SELinux has been part of the
mainline Linux kernel for nearly 20 years now [1] and has received
contributions from many individuals and organizations.
[1] https://lore.kernel.org/lkml/Pine.LNX.4.44.0308082228470.1852-100000@home.osdl.org/
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use the type bool as parameter type in
selinux_status_update_setenforce(). The related function
enforcing_enabled() returns the type bool, while the struct
selinux_kernel_status member enforcing uses an u32.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: subject line tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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hashtab_init() takes an u32 as size parameter type.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: subject line tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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