[ Upstream commit c1a85a00ea ]
This patch provides a general mechanism for passing flags to the
security_capable LSM hook. It replaces the specific 'audit' flag that is
used to tell security_capable whether it should log an audit message for
the given capability check. The reason for generalizing this flag
passing is so we can add an additional flag that signifies whether
security_capable is being called by a setid syscall (which is needed by
the proposed SafeSetID LSM).
Signed-off-by: Micah Morton <mortonm@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 8c62ed27a1 upstream.
aa_xattrs_match() is unfortunately calling vfs_getxattr_alloc() from a
context protected by an rcu_read_lock. This can not be done as
vfs_getxattr_alloc() may sleep regardles of the gfp_t value being
passed to it.
Fix this by breaking the rcu_read_lock on the policy search when the
xattr match feature is requested and restarting the search if a policy
changes occur.
Fixes: 8e51f9087f ("apparmor: Add support for attaching profiles via xattr, presence and value")
Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 00e0590dba ]
The sanity check in macro update_for_len checks to see if len
is less than zero, however, len is a size_t so it can never be
less than zero, so this sanity check is a no-op. Fix this by
making len a ssize_t so the comparison will work and add ulen
that is a size_t copy of len so that the min() macro won't
throw warnings about comparing different types.
Addresses-Coverity: ("Macro compares unsigned to 0")
Fixes: f1bd904175 ("apparmor: add the base fns() for domain labels")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 201218e4d3 ]
Although the apparmorfs dentries are always dropped from the dentry cache
when the usage count drops to zero, there is no guarantee that this will
happen in aafs_remove(), as another thread might still be using it. In
this scenario, this means that the dentry will temporarily continue to
appear in the results of lookups, even after the call to aafs_remove().
In the case of removal of a profile - it also causes simple_rmdir()
on the profile directory to fail, as the directory won't be empty until
the usage counts of all child dentries have decreased to zero. This
results in the dentry for the profile directory leaking and appearing
empty in the file system tree forever.
Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 156e42996b ]
Each function that manipulates the aa_ext struct should reset it's "pos"
member on failure. This ensures that, on failure, no changes are made to
the state of the aa_ext struct.
There are paths were elements are optional and the error path is
used to indicate the optional element is not present. This means
instead of just aborting on error the unpack stream can become
unsynchronized on optional elements, if using one of the affected
functions.
Cc: stable@vger.kernel.org
Fixes: 736ec752d9 ("AppArmor: policy routines for loading and unpacking policy")
Signed-off-by: Mike Salvatore <mike.salvatore@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 8404d7a674 upstream.
A packed AppArmor policy contains null-terminated tag strings that are read
by unpack_nameX(). However, unpack_nameX() uses string functions on them
without ensuring that they are actually null-terminated, potentially
leading to out-of-bounds accesses.
Make sure that the tag string is null-terminated before passing it to
strcmp().
Cc: stable@vger.kernel.org
Fixes: 736ec752d9 ("AppArmor: policy routines for loading and unpacking policy")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit 23375b13f9 upstream.
While commit 11c236b89d ("apparmor: add a default null dfa") ensure
every profile has a policy.dfa it does not resize the policy.start[]
to have entries for every possible start value. Which means
PROFILE_MEDIATES is not safe to use on untrusted input. Unforunately
commit b9590ad4c4 ("apparmor: remove POLICY_MEDIATES_SAFE") did not
take into account the start value usage.
The input string in profile_query_cb() is user controlled and is not
properly checked to be within the limited start[] entries, even worse
it can't be as userspace policy is allowed to make us of entries types
the kernel does not know about. This mean usespace can currently cause
the kernel to access memory up to 240 entries beyond the start array
bounds.
Cc: stable@vger.kernel.org
Fixes: b9590ad4c4 ("apparmor: remove POLICY_MEDIATES_SAFE")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit f51dcd0f62 ]
symlink body shouldn't be freed without an RCU delay. Switch apparmorfs
to ->destroy_inode() and use of call_rcu(); free both the inode and symlink
body in the callback.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit d6d478aee0 ]
aa_label_merge() can return NULL for memory allocations failures
make sure to handle and set the correct error in this case.
Reported-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Pull apparmor updates from John Johansen:
"There is nothing major this time just four bug fixes and a patch to
remove some dead code:
Cleanups:
- remove no-op permission check in policy_unpack
Bug fixes:
- fix an error code in __aa_create_ns()
- fix failure to audit context info in build_change_hat
- check buffer bounds when mapping permissions mask
- fully initialize aa_perms struct when answering userspace query"
* tag 'apparmor-pr-2018-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
apparmor: remove no-op permission check in policy_unpack
apparmor: fix an error code in __aa_create_ns()
apparmor: Fix failure to audit context info in build_change_hat
apparmor: Fully initialize aa_perms struct when answering userspace query
apparmor: Check buffer bounds when mapping permissions mask
We should return error pointers in this function. Returning NULL
results in a NULL dereference in the caller.
Fixes: 73688d1ed0 ("apparmor: refactor prepare_ns() and make usable from different views")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Cleans up clang warning:
warning: variable 'info' set but not used [-Wunused-but-set-variable]
Fixes: 89dbf1962a ("apparmor: move change_hat mediation to using labels")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Fully initialize the aa_perms struct in profile_query_cb() to avoid the
potential of using an uninitialized struct member's value in a response
to a query from userspace.
Detected by CoverityScan CID#1415126 ("Uninitialized scalar variable")
Fixes: 4f3b3f2d79 ("apparmor: add profile permission query ability")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Don't read past the end of the buffer containing permissions
characters or write past the end of the destination string.
Detected by CoverityScan CID#1415361, 1415376 ("Out-of-bounds access")
Fixes: e53cfe6c7c ("apparmor: rework perm mapping to a slightly broader set")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Pull AppArmor updates from John Johansen:
"Features
- add support for mapping secids and using secctxes
- add the ability to get a task's secid
- add support for audit rule filtering
Cleanups:
- multiple typo fixes
- Convert to use match_string() helper
- update git and wiki locations in AppArmor docs
- improve get_buffers macro by using get_cpu_ptr
- Use an IDR to allocate apparmor secids
Bug fixes:
- fix '*seclen' is never less than zero
- fix mediation of prlimit
- fix memory leak when deduping profile load
- fix ptrace read check
- fix memory leak of rule on error exit path"
* tag 'apparmor-pr-2018-06-13' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (21 commits)
apparmor: fix ptrace read check
apparmor: fix memory leak when deduping profile load
apparmor: fix mediation of prlimit
apparmor: fixup secid map conversion to using IDR
apparmor: Use an IDR to allocate apparmor secids
apparmor: Fix memory leak of rule on error exit path
apparmor: modify audit rule support to support profile stacks
apparmor: Add support for audit rule filtering
apparmor: update git and wiki locations in AppArmor docs
apparmor: Convert to use match_string() helper
apparmor: improve get_buffers macro by using get_cpu_ptr
apparmor: fix '*seclen' is never less than zero
apparmor: fix typo "preconfinement"
apparmor: fix typo "independent"
apparmor: fix typo "traverse"
apparmor: fix typo "type"
apparmor: fix typo "replace"
apparmor: fix typo "comparison"
apparmor: fix typo "loosen"
apparmor: add the ability to get a task's secid
...
The ptrace read check is incorrect resulting in policy that is
broader than it needs to be. Fix the check so that read access
permission can be properly detected when other ptrace flags are
set.
Fixes: b2d09ae449 ("apparmor: move ptrace checks to using labels")
Signed-off-by: John Johansen <john.johansen@canonical.com>
AppArmor is leaking the newly loaded profile and its proxy when
the profile is an exact match to the currently loaded version.
In this case the dedup check results in the profile being skipped and
put without dealing with the proxy ref thus not breaking a circular
refcount and causing a leak.
BugLink: http://bugs.launchpad.net/bugs/1750594
Fixes: 5d5182cae4 ("apparmor: move to per loaddata files, instead of replicating in profiles")
Signed-off-by: John Johansen <john.johansen@canonical.com>
For primit apparmor requires that if target confinement does not match
the setting task's confinement, the setting task requires CAP_SYS_RESOURCE.
Unfortunately this was broken when rlimit enforcement was reworked to
support labels.
Fixes: 86b92cb782 ("apparmor: move resource checks to using labels")
Signed-off-by: John Johansen <john.johansen@canonical.com>
The IDR conversion did not handle an error case for when allocating a
mapping fails, and it did not ensure that mappings did not allocate or
use a 0 value, which is used as an invalid secid. Which is used when a
mapping fails.
Fixes: 3ae7eb49a2be ("apparmor: Use an IDR to allocate apparmor secids")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Replace the custom usage of the radix tree to store a list of free IDs
with the IDR.
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Currently on the error exit path the allocated rule is not free'd
causing a memory leak. Fix this by calling aa_audit_rule_free().
Detected by CoverityScan, CID#1468966 ("Resource leaks")
Fixes: cb740f574c7b ("apparmor: modify audit rule support to support profile stacks")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Allows for audit rules, where a rule could specify a profile stack
A//&B, while extending the current semantic so if the label specified
in the audit rule is a subset of the secid it is considered a match.
Eg. if the secid resolves to the label stack A//&B//&C
Then an audit rule specifying a label of
A - would match
B - would match
C - would match
D - would not
A//&B - would match as a subset
A//&C - would match as a subset
B//&C - would match as a subset
A//&B//&C - would match
A//&D - would not match, because while A does match, D is also
specified and does not
Note: audit rules are currently assumed to be coming from the root
namespace.
Signed-off-by: John Johansen <john.johansen@canonical.com>
This patch adds support to Apparmor for integrating with audit rule
filtering. Right now it only handles SUBJ_ROLE, interpreting it as a
single component of a label. This is sufficient to get Apparmor working
with IMA's appraisal rules without any modifications on the IMA side.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Refactor get_buffers so the cpu_ptr can be obtained in the outer
layer, instead of inside the macro.
This also enables us to cleanup the code and use get_cpu_ptr,
to handle the preempt_disable()
Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>
Use a radix tree to provide a map between the secid and the label,
and along with it a basic ability to provide secctx conversion.
Shared/cached secctx will be added later.
Signed-off-by: John Johansen <john.johansen@canonical.com>
Pull apparmor updates from John Johansen:
"Features:
- add base infrastructure for socket mediation. ABI bump and
additional checks to ensure only v8 compliant policy uses socket af
mediation.
- improve and cleanup dfa verification
- improve profile attachment logic
- improve overlapping expression handling
- add the xattr matching to the attachment logic
- improve signal mediation handling with stacked labels
- improve handling of no_new_privs in a label stack
Cleanups and changes:
- use dfa to parse string split
- bounded version of label_parse
- proper line wrap nulldfa.in
- split context out into task and cred naming to better match usage
- simplify code in aafs
Bug fixes:
- fix display of .ns_name for containers
- fix resource audit messages when auditing peer
- fix logging of the existence test for signals
- fix resource audit messages when auditing peer
- fix display of .ns_name for containers
- fix an error code in verify_table_headers()
- fix memory leak on buffer on error exit path
- fix error returns checks by making size a ssize_t"
* tag 'apparmor-pr-2018-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (36 commits)
apparmor: fix memory leak on buffer on error exit path
apparmor: fix dangling symlinks to policy rawdata after replacement
apparmor: Fix an error code in verify_table_headers()
apparmor: fix error returns checks by making size a ssize_t
apparmor: update MAINTAINERS file git and wiki locations
apparmor: remove POLICY_MEDIATES_SAFE
apparmor: add base infastructure for socket mediation
apparmor: improve overlapping domain attachment resolution
apparmor: convert attaching profiles via xattrs to use dfa matching
apparmor: Add support for attaching profiles via xattr, presence and value
apparmor: cleanup: simplify code to get ns symlink name
apparmor: cleanup create_aafs() error path
apparmor: dfa split verification of table headers
apparmor: dfa add support for state differential encoding
apparmor: dfa move character match into a macro
apparmor: update domain transitions that are subsets of confinement at nnp
apparmor: move context.h to cred.h
apparmor: move task related defines and fns to task.X files
apparmor: cleanup, drop unused fn __aa_task_is_confined()
apparmor: cleanup fixup description of aa_replace_profiles
...
Pull general security layer updates from James Morris:
- Convert security hooks from list to hlist, a nice cleanup, saving
about 50% of space, from Sargun Dhillon.
- Only pass the cred, not the secid, to kill_pid_info_as_cred and
security_task_kill (as the secid can be determined from the cred),
from Stephen Smalley.
- Close a potential race in kernel_read_file(), by making the file
unwritable before calling the LSM check (vs after), from Kees Cook.
* 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
security: convert security hooks to use hlist
exec: Set file unwritable before LSM check
usb, signal, security: only pass the cred, not the secid, to kill_pid_info_as_cred and security_task_kill
Currently <linux/slab.h> #includes <linux/kmemleak.h> for no obvious
reason. It looks like it's only a convenience, so remove kmemleak.h
from slab.h and add <linux/kmemleak.h> to any users of kmemleak_* that
don't already #include it. Also remove <linux/kmemleak.h> from source
files that do not use it.
This is tested on i386 allmodconfig and x86_64 allmodconfig. It would
be good to run it through the 0day bot for other $ARCHes. I have
neither the horsepower nor the storage space for the other $ARCHes.
Update: This patch has been extensively build-tested by both the 0day
bot & kisskb/ozlabs build farms. Both of them reported 2 build failures
for which patches are included here (in v2).
[ slab.h is the second most used header file after module.h; kernel.h is
right there with slab.h. There could be some minor error in the
counting due to some #includes having comments after them and I didn't
combine all of those. ]
[akpm@linux-foundation.org: security/keys/big_key.c needs vmalloc.h, per sfr]
Link: http://lkml.kernel.org/r/e4309f98-3749-93e1-4bb7-d9501a39d015@infradead.org
Link: http://kisskb.ellerman.id.au/kisskb/head/13396/
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Reported-by: Michael Ellerman <mpe@ellerman.id.au> [2 build failures]
Reported-by: Fengguang Wu <fengguang.wu@intel.com> [2 build failures]
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Wei Yongjun <weiyongjun1@huawei.com>
Cc: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Currently on the error exit path the allocated buffer is not free'd
causing a memory leak. Fix this by kfree'ing it.
Detected by CoverityScan, CID#1466876 ("Resource leaks")
Fixes: 1180b4c757 ("apparmor: fix dangling symlinks to policy rawdata after replacement")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
move COUNT_ARGS() macro from apparmor to generic header and extend it
to count till twelve.
COUNT() was an alternative name for this logic, but it's used for
different purpose in many other places.
Similarly for CONCATENATE() macro.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
When policy replacement occurs the symlinks in the profile directory
need to be updated to point to the new rawdata, otherwise once the
old rawdata is removed the symlink becomes broken.
Fix this by dynamically generating the symlink everytime it is read.
These links are used enough that their value needs to be cached and
this way we can avoid needing locking to read and update the link
value.
Fixes: a481f4d917 ("apparmor: add custom apparmorfs that will be used by policy namespace files")
BugLink: http://bugs.launchpad.net/bugs/1755563
Signed-off-by: John Johansen <john.johansen@canonical.com>
We accidentally return a positive EPROTO instead of a negative -EPROTO.
Since 71 is not an error pointer, that means it eventually results in an
Oops in the caller.
Fixes: d901d6a298 ("apparmor: dfa split verification of table headers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Currently variable size is a unsigned size_t, hence comparisons to
see if it is less than zero (for error checking) will always be
false. Fix this by making size a ssize_t
Detected by CoverityScan, CID#1466080 ("Unsigned compared against 0")
Fixes: 8e51f9087f ("apparmor: Add support for attaching profiles via xattr, presence and value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
The unpack code now makes sure every profile has a dfa so the safe
version of POLICY_MEDIATES is no longer needed.
Signed-off-by: John Johansen <john.johansen@canonical.com>
version 2 - Force an abi break. Network mediation will only be
available in v8 abi complaint policy.
Provide a basic mediation of sockets. This is not a full net mediation
but just whether a spcific family of socket can be used by an
application, along with setting up some basic infrastructure for
network mediation to follow.
the user space rule hav the basic form of
NETWORK RULE = [ QUALIFIERS ] 'network' [ DOMAIN ]
[ TYPE | PROTOCOL ]
DOMAIN = ( 'inet' | 'ax25' | 'ipx' | 'appletalk' | 'netrom' |
'bridge' | 'atmpvc' | 'x25' | 'inet6' | 'rose' |
'netbeui' | 'security' | 'key' | 'packet' | 'ash' |
'econet' | 'atmsvc' | 'sna' | 'irda' | 'pppox' |
'wanpipe' | 'bluetooth' | 'netlink' | 'unix' | 'rds' |
'llc' | 'can' | 'tipc' | 'iucv' | 'rxrpc' | 'isdn' |
'phonet' | 'ieee802154' | 'caif' | 'alg' | 'nfc' |
'vsock' | 'mpls' | 'ib' | 'kcm' ) ','
TYPE = ( 'stream' | 'dgram' | 'seqpacket' | 'rdm' | 'raw' |
'packet' )
PROTOCOL = ( 'tcp' | 'udp' | 'icmp' )
eg.
network,
network inet,
Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>
