| Commit message (Collapse) | Author | Age | Files | Lines |
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git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Pull LSM updates from Paul Moore:
- Add new credential functions, get_cred_many() and put_cred_many() to
save some atomic_t operations for a few operations.
While not strictly LSM related, this patchset had been rotting on the
mailing lists for some time and since the LSMs do care a lot about
credentials I thought it reasonable to give this patch a home.
- Five patches to constify different LSM hook parameters.
- Fix a spelling mistake.
* tag 'lsm-pr-20231030' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm:
lsm: fix a spelling mistake
cred: add get_cred_many and put_cred_many
lsm: constify 'sb' parameter in security_sb_kern_mount()
lsm: constify 'bprm' parameter in security_bprm_committed_creds()
lsm: constify 'bprm' parameter in security_bprm_committing_creds()
lsm: constify 'file' parameter in security_bprm_creds_from_file()
lsm: constify 'sb' parameter in security_quotactl()
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The "sb_kern_mount" hook has implementation registered in SELinux.
Looking at the function implementation we observe that the "sb"
parameter is not changing.
Mark the "sb" parameter of LSM hook security_sb_kern_mount() as "const"
since it will not be changing in the LSM hook.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
[PM: minor merge fuzzing due to other constification patches]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Three LSMs register the implementations for the 'bprm_committed_creds()'
hook: AppArmor, SELinux and tomoyo. Looking at the function
implementations we may observe that the 'bprm' parameter is not changing.
Mark the 'bprm' parameter of LSM hook security_bprm_committed_creds() as
'const' since it will not be changing in the LSM hook.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
[PM: minor merge fuzzing due to other constification patches]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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The 'bprm_committing_creds' hook has implementations registered in
SELinux and Apparmor. Looking at the function implementations we observe
that the 'bprm' parameter is not changing.
Mark the 'bprm' parameter of LSM hook security_bprm_committing_creds()
as 'const' since it will not be changing in the LSM hook.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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SELinux registers the implementation for the "quotactl" hook. Looking at
the function implementation we observe that the parameter "sb" is not
changing.
Mark the "sb" parameter of LSM hook security_quotactl() as "const" since
it will not be changing in the LSM hook.
Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
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:
- improve the SELinux debugging configuration controls in Kconfig
- print additional information about the hash table chain lengths when
when printing SELinux debugging information
- simplify the SELinux access vector hash table calcaulations
- use a better hashing function for the SELinux role tansition hash
table
- improve SELinux load policy time through the use of optimized
functions for calculating the number of bits set in a field
- addition of a __counted_by annotation
- simplify the avtab_inert_node() function through a simplified
prototype
* tag 'selinux-pr-20231030' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
selinux: simplify avtab_insert_node() prototype
selinux: hweight optimization in avtab_read_item
selinux: improve role transition hashing
selinux: simplify avtab slot calculation
selinux: improve debug configuration
selinux: print sum of chain lengths^2 for hash tables
selinux: Annotate struct sidtab_str_cache with __counted_by
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__hashtab_insert() in hashtab.h has a cleaner interface that allows the
caller to specify the chain node location that the new node is being
inserted into so that it can update the node that currently occupies it.
Signed-off-by: Jacob Satterfield <jsatterfield.linux@gmail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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avtab_read_item() is a hot function called when reading each rule in a
binary policydb. With the current Fedora policy and refpolicy, this
function is called nearly 100,000 times per policy load.
A single avtab node is only permitted to have a single specifier to
describe the data it holds. As such, a check is performed to make sure
only one specifier is set. Previously this was done via a for-loop.
However, there is already an optimal function for finding the number of
bits set (hamming weight) and on some architectures, dedicated
instructions (popcount) which can be executed much more efficiently.
Even when using -mcpu=generic on a x86-64 Fedora 38 VM, this commit
results in a modest 2-4% speedup for policy loading due to a substantial
reduction in the number of instructions executed.
Signed-off-by: Jacob Satterfield <jsatterfield.linux@gmail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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The number of buckets is calculated by performing a binary AND against
the mask of the hash table, which is one less than its size (which is a
power of two). This leads to all top bits being discarded, e.g. with
the Reference Policy on Debian there exists 376 entries, leading to a
size of 512, discarding the top 23 bits.
Use jhash to improve the hash table utilization:
# current
roletr: 376 entries and 124/512 buckets used,
longest chain length 8, sum of chain length^2 1496
# patch
roletr: 376 entries and 266/512 buckets used,
longest chain length 4, sum of chain length^2 646
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
[PM: line wrap in the commit description]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Instead of dividing by 8 and then performing log2 by hand, use a more
readable calculation.
The behavior of rounddown_pow_of_two() for an input of 0 is undefined,
so handle that case and small values manually to achieve the same
results.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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If the SELinux debug configuration is enabled define the macro DEBUG
such that pr_debug() calls are always enabled, regardless of
CONFIG_DYNAMIC_DEBUG, since those message are the main reason for this
configuration in the first place.
Mention example usage in case CONFIG_DYNAMIC_DEBUG is enabled in the
help section of the configuration.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Print the sum of chain lengths squared as a metric for hash tables to
provide more insights, similar to avtabs.
While on it add a comma in the avtab message to improve readability of
the output.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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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 sidtab_str_cache.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <stephen.smalley.work@gmail.com>
Cc: Eric Paris <eparis@parisplace.org>
Cc: Ondrej Mosnacek <omosnace@redhat.com>
Cc: selinux@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Convert to using the new inode timestamp accessor functions.
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20231004185347.80880-83-jlayton@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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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/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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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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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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The specifier for avtab keys is always supplied with a type of u16,
either as a macro to security_compute_sid() or the member specified of
the struct avtab_key.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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Use the identical types in assignments of local variables for the
destination.
Merge tail calls into return statements.
Avoid using leading underscores for function local variable.
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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Use a consistent type of u32 for sequence numbers.
Use a non-negative and input parameter matching type for the hash
result.
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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Use the identical type sel_netif_hashfn() returns.
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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Align the type with the one used in selinux_notify_policy_change() and
the sequence member of struct selinux_kernel_status.
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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Prevent inserting more than the supported U32_MAX number of entries.
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
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