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2017-06-11apparmor: add cross check permission helper macrosJohn Johansen1-1/+41
The cross check permission helper macros will help simplify code that does cross task permission checks like ptrace. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: move resource checks to using labelsJohn Johansen3-42/+80
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: move capability checks to using labelsJohn Johansen5-29/+58
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: update query interface to support label queriesJohn Johansen1-7/+39
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: switch getprocattr to using label_print fns()John Johansen3-37/+27
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: switch from profiles to using labels on contextsJohn Johansen20-529/+686
Begin the actual switch to using domain labels by storing them on the context and converting the label to a singular profile where possible. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add the base fns() for domain labelsJohn Johansen2-0/+2561
Begin moving apparmor to using broader domain labels, that will allow run time computation of domain type splitting via "stacking" of profiles into a domain label vec. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: revalidate files during execJohn Johansen4-0/+81
Instead of running file revalidation lazily when read/write are called copy selinux and revalidate the file table on exec. This avoids extra mediation overhead in read/write and also prevents file handles being passed through to a grand child unchecked. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: cleanup rename XXX_file_context() to XXX_file_ctx()John Johansen2-11/+16
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: convert aa_change_XXX bool parameters to flagsJohn Johansen5-32/+29
Instead of passing multiple booleans consolidate on a single flags field. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: cleanup remove unused and not fully implemented profile renameJohn Johansen1-37/+2
Remove the partially implemented code, until this can be properly implemented. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: refactor updating profiles to the newest parentJohn Johansen1-4/+31
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: share profile name on replacementJohn Johansen3-9/+72
The profile names are the same, leverage this. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: convert to profile block critical sectionsJohn Johansen8-56/+162
There are still a few places where profile replacement fails to update and a stale profile is used for mediation. Fix this by moving to accessing the current label through a critical section that will always ensure mediation is using the current label regardless of whether the tasks cred has been updated or not. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: move bprm_committing_creds/committed_creds to lsm.cJohn Johansen3-32/+30
There is no reason to have the small stubs that don't use domain private functions in domain.c, instead move them to lsm.c and make them static. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: fix display of ns nameJohn Johansen1-1/+1
The ns name being displayed should go through an ns view lookup. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: fix apparmor_query dataJohn Johansen1-2/+6
The data being queried isn't always the current profile and a lookup relative to the current profile should be done. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: fix policy load/remove semanticsJohn Johansen2-15/+13
The namespace being passed into the replace/remove profiles fns() is not the view, but the namespace specified by the inode from the file hook (if present) or the loading tasks ns, if accessing the top level virtualized load/replace file interface. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add namespace lookup fns()John Johansen3-4/+73
Currently lookups are restricted to a single ns component in the path. However when namespaces are allowed to have separate views, and scopes this will not be sufficient, as it will be possible to have a multiple component ns path in scope. Add some ns lookup fns() to allow this and use them. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: cleanup __find_child()John Johansen1-8/+8
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: provide information about path buffer size at bootJohn Johansen1-2/+9
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add profile permission query abilityJohn Johansen1-1/+102
Allow userspace to query a profile about permissions, through the transaction interface that is already used to allow userspace to query about key,value data. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: switch from file_perms to aa_permsJohn Johansen5-48/+29
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add gerneric permissions struct and support fnsJohn Johansen4-17/+153
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add fn to test if profile supports a given mediation classJohn Johansen1-0/+10
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: speed up transactional queriesJohn Johansen1-11/+114
The simple_transaction interface is slow. It requires 4 syscalls (open, write, read, close) per query and shares a single lock for each queries. So replace its use with a compatible in multi_transaction interface. It allows for a faster 2 syscall pattern per query. After an initial open, an arbitrary number of writes and reads can be issued. Each write will reset the query with new data that can be read. Reads do not clear the data, and can be issued multiple times, and used with seek, until a new write is performed which will reset the data available and the seek position. Note: this keeps the single lock design, if needed moving to a per file lock will have to come later. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add label data availability to the feature setJohn Johansen1-0/+10
gsettings mediation needs to be able to determine if apparmor supports label data queries. A label data query can be done to test for support but its failure is indistinguishable from other failures, making it an unreliable indicator. Fix by making support of label data queries available as a flag in the apparmorfs features dir tree. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add mkdir/rmdir interface to manage policy namespacesJohn Johansen1-1/+94
When setting up namespaces for containers its easier for them to use an fs interface to create the namespace for the containers policy. Allow mkdir/rmdir under the policy/namespaces/ dir to be used to create and remove namespaces. BugLink: http://bugs.launchpad.net/bugs/1611078 Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: add policy revision file interfaceJohn Johansen4-1/+116
Add a policy revision file to find the current revision of a ns's policy. There is a revision file per ns, as well as a virtualized global revision file in the base apparmor fs directory. The global revision file when opened will provide the revision of the opening task namespace. The revision file can be waited on via select/poll to detect apparmor policy changes from the last read revision of the opened file. This means that the revision file must be read after the select/poll other wise update data will remain ready for reading. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-11apparmor: provide finer control over policy managementJohn Johansen3-23/+35
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-09apparmor: rework perm mapping to a slightly broader setJohn Johansen5-53/+133
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmor: move permissions into their own file to be more easily sharedJohn Johansen4-19/+43
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmor: convert from securityfs to apparmorfs for policy ns filesJohn Johansen1-26/+37
Virtualize the apparmor policy/ directory so that the current namespace affects what part of policy is seen. To do this convert to using apparmorfs for policy namespace files and setup a magic symlink in the securityfs apparmor dir to access those files. Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: allow specifying an already created dir to create ns entries inJohn Johansen3-7/+8
Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: rename apparmor file fns and data to indicate useJohn Johansen9-127/+172
prefixes are used for fns/data that are not static to apparmorfs.c with the prefixes being aafs - special magic apparmorfs for policy namespace data aa_sfs - for fns/data that go into securityfs aa_fs - for fns/data that may be used in the either of aafs or securityfs Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: add custom apparmorfs that will be used by policy namespace filesJohn Johansen1-17/+336
AppArmor policy needs to be able to be resolved based on the policy namespace a task is confined by. Add a base apparmorfs filesystem that (like nsfs) will exist as a kern mount and be accessed via jump_link through a securityfs file. Setup the base apparmorfs fns and data, but don't use it yet. Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: use macro template to simplify namespace seq_filesJohn Johansen1-29/+24
Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: use macro template to simplify profile seq_filesJohn Johansen1-61/+36
Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: move to per loaddata files, instead of replicating in profilesJohn Johansen7-69/+409
The loaddata sets cover more than just a single profile and should be tracked at the ns level. Move the load data files under the namespace and reference the files from the profiles via a symlink. Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2017-06-08apparmor: Move path lookup to using preallocated buffersJohn Johansen4-86/+53
Dynamically allocating buffers is problematic and is an extra layer that is a potntial point of failure and can slow down mediation. Change path lookup to use the preallocated per cpu buffers. Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmor: allow profiles to provide info to disconnected pathsJohn Johansen6-17/+34
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmor: make internal lib fn skipn_spaces available to the rest of apparmorJohn Johansen2-1/+2
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmor: move file context into file.hJohn Johansen2-32/+32
Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08security/apparmor: Use POSIX-compatible "printf '%s'"Thomas Schneider1-2/+2
When using a strictly POSIX-compliant shell, "-n #define ..." gets written into the file. Use "printf '%s'" to avoid this. Signed-off-by: Thomas Schneider <qsx@qsx.re> Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmor: Fix error cod in __aa_fs_profile_mkdir()Dan Carpenter1-2/+4
We can either return PTR_ERR(NULL) or a PTR_ERR(a valid pointer) here. Returning NULL is probably not good, but since this happens at boot then we are probably already toasted if we were to hit this bug in real life. In other words, it seems like a very low severity bug to me. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmorfs: Use seq_putc() in two functionsMarkus Elfring1-2/+2
Two single characters (line breaks) should be put into a sequence. Thus use the corresponding function "seq_putc". This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-06-08apparmorfs: Combine two function calls into one in aa_fs_seq_raw_abi_show()Markus Elfring1-4/+3
A bit of data was put into a sequence by two separate function calls. Print the same data by a single function call instead. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: John Johansen <john.johansen@canonical.com>
2017-05-18doc: ReSTify apparmor.txtKees Cook2-2/+2
Adjusts for ReST markup and moves under LSM admin guide. Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2017-05-09apparmorfs: replace CURRENT_TIME with current_time()Deepa Dinamani1-1/+1
CURRENT_TIME macro is not y2038 safe on 32 bit systems. The patch replaces all the uses of CURRENT_TIME by current_time(). This is also in preparation for the patch that transitions vfs timestamps to use 64 bit time and hence make them y2038 safe. current_time() is also planned to be transitioned to y2038 safe behavior along with this change. CURRENT_TIME macro will be deleted before merging the aforementioned change. Link: http://lkml.kernel.org/r/1491613030-11599-11-git-send-email-deepa.kernel@gmail.com Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-09mm: introduce kv[mz]alloc helpersMichal Hocko5-44/+3
Patch series "kvmalloc", v5. There are many open coded kmalloc with vmalloc fallback instances in the tree. Most of them are not careful enough or simply do not care about the underlying semantic of the kmalloc/page allocator which means that a) some vmalloc fallbacks are basically unreachable because the kmalloc part will keep retrying until it succeeds b) the page allocator can invoke a really disruptive steps like the OOM killer to move forward which doesn't sound appropriate when we consider that the vmalloc fallback is available. As it can be seen implementing kvmalloc requires quite an intimate knowledge if the page allocator and the memory reclaim internals which strongly suggests that a helper should be implemented in the memory subsystem proper. Most callers, I could find, have been converted to use the helper instead. This is patch 6. There are some more relying on __GFP_REPEAT in the networking stack which I have converted as well and Eric Dumazet was not opposed [2] to convert them as well. [1] http://lkml.kernel.org/r/20170130094940.13546-1-mhocko@kernel.org [2] http://lkml.kernel.org/r/1485273626.16328.301.camel@edumazet-glaptop3.roam.corp.google.com This patch (of 9): Using kmalloc with the vmalloc fallback for larger allocations is a common pattern in the kernel code. Yet we do not have any common helper for that and so users have invented their own helpers. Some of them are really creative when doing so. Let's just add kv[mz]alloc and make sure it is implemented properly. This implementation makes sure to not make a large memory pressure for > PAGE_SZE requests (__GFP_NORETRY) and also to not warn about allocation failures. This also rules out the OOM killer as the vmalloc is a more approapriate fallback than a disruptive user visible action. This patch also changes some existing users and removes helpers which are specific for them. In some cases this is not possible (e.g. ext4_kvmalloc, libcfs_kvzalloc) because those seems to be broken and require GFP_NO{FS,IO} context which is not vmalloc compatible in general (note that the page table allocation is GFP_KERNEL). Those need to be fixed separately. While we are at it, document that __vmalloc{_node} about unsupported gfp mask because there seems to be a lot of confusion out there. kvmalloc_node will warn about GFP_KERNEL incompatible (which are not superset) flags to catch new abusers. Existing ones would have to die slowly. [sfr@canb.auug.org.au: f2fs fixup] Link: http://lkml.kernel.org/r/20170320163735.332e64b7@canb.auug.org.au Link: http://lkml.kernel.org/r/20170306103032.2540-2-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Reviewed-by: Andreas Dilger <adilger@dilger.ca> [ext4 part] Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: John Hubbard <jhubbard@nvidia.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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