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2015-10-22apparmor: clarify CRYPTO dependencyArnd Bergmann1-1/+1
The crypto framework can be built as a loadable module, but the apparmor hash code can only be built-in, which then causes a link error: security/built-in.o: In function `aa_calc_profile_hash': integrity_audit.c:(.text+0x21610): undefined reference to `crypto_shash_update' security/built-in.o: In function `init_profile_hash': integrity_audit.c:(.init.text+0xb4c): undefined reference to `crypto_alloc_shash' This changes Apparmor to use 'select CRYPTO' like a lot of other subsystems do. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2015-07-01Merge tag 'modules-next-for-linus' of ↵Linus Torvalds1-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull module updates from Rusty Russell: "Main excitement here is Peter Zijlstra's lockless rbtree optimization to speed module address lookup. He found some abusers of the module lock doing that too. A little bit of parameter work here too; including Dan Streetman's breaking up the big param mutex so writing a parameter can load another module (yeah, really). Unfortunately that broke the usual suspects, !CONFIG_MODULES and !CONFIG_SYSFS, so those fixes were appended too" * tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (26 commits) modules: only use mod->param_lock if CONFIG_MODULES param: fix module param locks when !CONFIG_SYSFS. rcu: merge fix for Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE() module: add per-module param_lock module: make perm const params: suppress unused variable error, warn once just in case code changes. modules: clarify CONFIG_MODULE_COMPRESS help, suggest 'N'. kernel/module.c: avoid ifdefs for sig_enforce declaration kernel/workqueue.c: remove ifdefs over wq_power_efficient kernel/params.c: export param_ops_bool_enable_only kernel/params.c: generalize bool_enable_only kernel/module.c: use generic module param operaters for sig_enforce kernel/params: constify struct kernel_param_ops uses sysfs: tightened sysfs permission checks module: Rework module_addr_{min,max} module: Use __module_address() for module_address_lookup() module: Make the mod_tree stuff conditional on PERF_EVENTS || TRACING module: Optimize __module_address() using a latched RB-tree rbtree: Implement generic latch_tree seqlock: Introduce raw_read_seqcount_latch() ...
2015-05-28kernel/params: constify struct kernel_param_ops usesLuis R. Rodriguez1-3/+3
Most code already uses consts for the struct kernel_param_ops, sweep the kernel for the last offending stragglers. Other than include/linux/moduleparam.h and kernel/params.c all other changes were generated with the following Coccinelle SmPL patch. Merge conflicts between trees can be handled with Coccinelle. In the future git could get Coccinelle merge support to deal with patch --> fail --> grammar --> Coccinelle --> new patch conflicts automatically for us on patches where the grammar is available and the patch is of high confidence. Consider this a feature request. Test compiled on x86_64 against: * allnoconfig * allmodconfig * allyesconfig @ const_found @ identifier ops; @@ const struct kernel_param_ops ops = { }; @ const_not_found depends on !const_found @ identifier ops; @@ -struct kernel_param_ops ops = { +const struct kernel_param_ops ops = { }; Generated-by: Coccinelle SmPL Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Junio C Hamano <gitster@pobox.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: cocci@systeme.lip6.fr Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2015-05-12LSM: Switch to lists of hooksCasey Schaufler2-45/+18
Instead of using a vector of security operations with explicit, special case stacking of the capability and yama hooks use lists of hooks with capability and yama hooks included as appropriate. The security_operations structure is no longer required. Instead, there is a union of the function pointers that allows all the hooks lists to use a common mechanism for list management while retaining typing. Each module supplies an array describing the hooks it provides instead of a sparsely populated security_operations structure. The description includes the element that gets put on the hook list, avoiding the issues surrounding individual element allocation. The method for registering security modules is changed to reflect the information available. The method for removing a module, currently only used by SELinux, has also changed. It should be generic now, however if there are potential race conditions based on ordering of hook removal that needs to be addressed by the calling module. The security hooks are called from the lists and the first failure is returned. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Moore <paul@paul-moore.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <james.l.morris@oracle.com>
2015-05-12LSM: Add security module hook list headsCasey Schaufler1-42/+42
Add a list header for each security hook. They aren't used until later in the patch series. They are grouped together in a structure so that there doesn't need to be an external address for each. Macro-ize the initialization of the security_operations for each security module in anticipation of changing out the security_operations structure. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Moore <paul@paul-moore.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <james.l.morris@oracle.com>
2015-05-12LSM: Split security.hCasey Schaufler1-1/+1
The security.h header file serves two purposes, interfaces for users of the security modules and interfaces for security modules. Users of the security modules don't need to know about what's in the security_operations structure, so pull it out into it's own header, lsm_hooks.h Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Moore <paul@paul-moore.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <james.l.morris@oracle.com>
2015-04-15VFS: security/: d_inode() annotationsDavid Howells1-1/+1
... except where that code acts as a filesystem driver, rather than working with dentries given to it. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: security/: d_backing_inode() annotationsDavid Howells2-12/+12
most of the ->d_inode uses there refer to the same inode IO would go to, i.e. d_backing_inode() Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11switch security_inode_getattr() to struct path *Al Viro1-3/+3
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-02-22Apparmor: Use d_is_positive/negative() rather than testing dentry->d_inodeDavid Howells1-1/+1
Use d_is_positive(dentry) or d_is_negative(dentry) rather than testing dentry->d_inode as the dentry may cover another layer that has an inode when the top layer doesn't or may hold a 0,0 chardev that's actually a whiteout. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-02-22Apparmor: mediated_filesystem() should use dentry->d_sb not inode->i_sbDavid Howells2-12/+12
mediated_filesystem() should use dentry->d_sb not dentry->d_inode->i_sb and should avoid file_inode() also since it is really dealing with the path. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-27module: rename KERNEL_PARAM_FL_NOARG to avoid confusionJani Nikula1-2/+2
Make it clear this is about kernel_param_ops, not kernel_param (which will soon have a flags field of its own). No functional changes. Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jean Delvare <khali@linux-fr.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Jon Mason <jon.mason@intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-07-18sched: move no_new_privs into new atomic flagsKees Cook1-2/+2
Since seccomp transitions between threads requires updates to the no_new_privs flag to be atomic, the flag must be part of an atomic flag set. This moves the nnp flag into a separate task field, and introduces accessors. Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Andy Lutomirski <luto@amacapital.net>
2014-05-06nick kvfree() from apparmorAl Viro2-15/+0
too many places open-code it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-02-06security: replace strict_strto*() with kstrto*()Jingoo Han1-1/+1
The usage of strict_strto*() is not preferred, because strict_strto*() is obsolete. Thus, kstrto*() should be used. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2013-11-21Merge branch 'for-linus2' of ↵Linus Torvalds8-44/+22
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security Pull security subsystem updates from James Morris: "In this patchset, we finally get an SELinux update, with Paul Moore taking over as maintainer of that code. Also a significant update for the Keys subsystem, as well as maintenance updates to Smack, IMA, TPM, and Apparmor" and since I wanted to know more about the updates to key handling, here's the explanation from David Howells on that: "Okay. There are a number of separate bits. I'll go over the big bits and the odd important other bit, most of the smaller bits are just fixes and cleanups. If you want the small bits accounting for, I can do that too. (1) Keyring capacity expansion. KEYS: Consolidate the concept of an 'index key' for key access KEYS: Introduce a search context structure KEYS: Search for auth-key by name rather than target key ID Add a generic associative array implementation. KEYS: Expand the capacity of a keyring Several of the patches are providing an expansion of the capacity of a keyring. Currently, the maximum size of a keyring payload is one page. Subtract a small header and then divide up into pointers, that only gives you ~500 pointers on an x86_64 box. However, since the NFS idmapper uses a keyring to store ID mapping data, that has proven to be insufficient to the cause. Whatever data structure I use to handle the keyring payload, it can only store pointers to keys, not the keys themselves because several keyrings may point to a single key. This precludes inserting, say, and rb_node struct into the key struct for this purpose. I could make an rbtree of records such that each record has an rb_node and a key pointer, but that would use four words of space per key stored in the keyring. It would, however, be able to use much existing code. I selected instead a non-rebalancing radix-tree type approach as that could have a better space-used/key-pointer ratio. I could have used the radix tree implementation that we already have and insert keys into it by their serial numbers, but that means any sort of search must iterate over the whole radix tree. Further, its nodes are a bit on the capacious side for what I want - especially given that key serial numbers are randomly allocated, thus leaving a lot of empty space in the tree. So what I have is an associative array that internally is a radix-tree with 16 pointers per node where the index key is constructed from the key type pointer and the key description. This means that an exact lookup by type+description is very fast as this tells us how to navigate directly to the target key. I made the data structure general in lib/assoc_array.c as far as it is concerned, its index key is just a sequence of bits that leads to a pointer. It's possible that someone else will be able to make use of it also. FS-Cache might, for example. (2) Mark keys as 'trusted' and keyrings as 'trusted only'. KEYS: verify a certificate is signed by a 'trusted' key KEYS: Make the system 'trusted' keyring viewable by userspace KEYS: Add a 'trusted' flag and a 'trusted only' flag KEYS: Separate the kernel signature checking keyring from module signing These patches allow keys carrying asymmetric public keys to be marked as being 'trusted' and allow keyrings to be marked as only permitting the addition or linkage of trusted keys. Keys loaded from hardware during kernel boot or compiled into the kernel during build are marked as being trusted automatically. New keys can be loaded at runtime with add_key(). They are checked against the system keyring contents and if their signatures can be validated with keys that are already marked trusted, then they are marked trusted also and can thus be added into the master keyring. Patches from Mimi Zohar make this usable with the IMA keyrings also. (3) Remove the date checks on the key used to validate a module signature. X.509: Remove certificate date checks It's not reasonable to reject a signature just because the key that it was generated with is no longer valid datewise - especially if the kernel hasn't yet managed to set the system clock when the first module is loaded - so just remove those checks. (4) Make it simpler to deal with additional X.509 being loaded into the kernel. KEYS: Load *.x509 files into kernel keyring KEYS: Have make canonicalise the paths of the X.509 certs better to deduplicate The builder of the kernel now just places files with the extension ".x509" into the kernel source or build trees and they're concatenated by the kernel build and stuffed into the appropriate section. (5) Add support for userspace kerberos to use keyrings. KEYS: Add per-user_namespace registers for persistent per-UID kerberos caches KEYS: Implement a big key type that can save to tmpfs Fedora went to, by default, storing kerberos tickets and tokens in tmpfs. We looked at storing it in keyrings instead as that confers certain advantages such as tickets being automatically deleted after a certain amount of time and the ability for the kernel to get at these tokens more easily. To make this work, two things were needed: (a) A way for the tickets to persist beyond the lifetime of all a user's sessions so that cron-driven processes can still use them. The problem is that a user's session keyrings are deleted when the session that spawned them logs out and the user's user keyring is deleted when the UID is deleted (typically when the last log out happens), so neither of these places is suitable. I've added a system keyring into which a 'persistent' keyring is created for each UID on request. Each time a user requests their persistent keyring, the expiry time on it is set anew. If the user doesn't ask for it for, say, three days, the keyring is automatically expired and garbage collected using the existing gc. All the kerberos tokens it held are then also gc'd. (b) A key type that can hold really big tickets (up to 1MB in size). The problem is that Active Directory can return huge tickets with lots of auxiliary data attached. We don't, however, want to eat up huge tracts of unswappable kernel space for this, so if the ticket is greater than a certain size, we create a swappable shmem file and dump the contents in there and just live with the fact we then have an inode and a dentry overhead. If the ticket is smaller than that, we slap it in a kmalloc()'d buffer" * 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (121 commits) KEYS: Fix keyring content gc scanner KEYS: Fix error handling in big_key instantiation KEYS: Fix UID check in keyctl_get_persistent() KEYS: The RSA public key algorithm needs to select MPILIB ima: define '_ima' as a builtin 'trusted' keyring ima: extend the measurement list to include the file signature kernel/system_certificate.S: use real contents instead of macro GLOBAL() KEYS: fix error return code in big_key_instantiate() KEYS: Fix keyring quota misaccounting on key replacement and unlink KEYS: Fix a race between negating a key and reading the error set KEYS: Make BIG_KEYS boolean apparmor: remove the "task" arg from may_change_ptraced_domain() apparmor: remove parent task info from audit logging apparmor: remove tsk field from the apparmor_audit_struct apparmor: fix capability to not use the current task, during reporting Smack: Ptrace access check mode ima: provide hash algo info in the xattr ima: enable support for larger default filedata hash algorithms ima: define kernel parameter 'ima_template=' to change configured default ima: add Kconfig default measurement list template ...
2013-10-29apparmor: remove the "task" arg from may_change_ptraced_domain()Oleg Nesterov1-8/+6
Unless task == current ptrace_parent(task) is not safe even under rcu_read_lock() and most of the current users are not right. So may_change_ptraced_domain(task) looks wrong as well. However it is always called with task == current so the code is actually fine. Remove this argument to make this fact clear. Note: perhaps we should simply kill ptrace_parent(), it buys almost nothing. And it is obviously racy, perhaps this should be fixed. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-10-29apparmor: remove parent task info from audit loggingJohn Johansen2-7/+0
The reporting of the parent task info is a vestage from old versions of apparmor. The need for this information was removed by unique null- profiles before apparmor was upstreamed so remove this info from logging. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-10-29apparmor: remove tsk field from the apparmor_audit_structJohn Johansen1-8/+2
Now that aa_capabile no longer sets the task field it can be removed and the lsm_audit version of the field can be used. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-10-29apparmor: fix capability to not use the current task, during reportingJohn Johansen6-22/+15
Mediation is based off of the cred but auditing includes the current task which may not be related to the actual request. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-10-16apparmor: fix bad lock balance when introspecting policyJohn Johansen1-3/+1
BugLink: http://bugs.launchpad.net/bugs/1235977 The profile introspection seq file has a locking bug when policy is viewed from a virtual root (task in a policy namespace), introspection from the real root is not affected. The test for root while (parent) { is correct for the real root, but incorrect for tasks in a policy namespace. This allows the task to walk backup the policy tree past its virtual root causing it to be unlocked before the virtual root should be in the p_stop fn. This results in the following lockdep back trace: [ 78.479744] [ BUG: bad unlock balance detected! ] [ 78.479792] 3.11.0-11-generic #17 Not tainted [ 78.479838] ------------------------------------- [ 78.479885] grep/2223 is trying to release lock (&ns->lock) at: [ 78.479952] [<ffffffff817bf3be>] mutex_unlock+0xe/0x10 [ 78.480002] but there are no more locks to release! [ 78.480037] [ 78.480037] other info that might help us debug this: [ 78.480037] 1 lock held by grep/2223: [ 78.480037] #0: (&p->lock){+.+.+.}, at: [<ffffffff812111bd>] seq_read+0x3d/0x3d0 [ 78.480037] [ 78.480037] stack backtrace: [ 78.480037] CPU: 0 PID: 2223 Comm: grep Not tainted 3.11.0-11-generic #17 [ 78.480037] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 78.480037] ffffffff817bf3be ffff880007763d60 ffffffff817b97ef ffff8800189d2190 [ 78.480037] ffff880007763d88 ffffffff810e1c6e ffff88001f044730 ffff8800189d2190 [ 78.480037] ffffffff817bf3be ffff880007763e00 ffffffff810e5bd6 0000000724fe56b7 [ 78.480037] Call Trace: [ 78.480037] [<ffffffff817bf3be>] ? mutex_unlock+0xe/0x10 [ 78.480037] [<ffffffff817b97ef>] dump_stack+0x54/0x74 [ 78.480037] [<ffffffff810e1c6e>] print_unlock_imbalance_bug+0xee/0x100 [ 78.480037] [<ffffffff817bf3be>] ? mutex_unlock+0xe/0x10 [ 78.480037] [<ffffffff810e5bd6>] lock_release_non_nested+0x226/0x300 [ 78.480037] [<ffffffff817bf2fe>] ? __mutex_unlock_slowpath+0xce/0x180 [ 78.480037] [<ffffffff817bf3be>] ? mutex_unlock+0xe/0x10 [ 78.480037] [<ffffffff810e5d5c>] lock_release+0xac/0x310 [ 78.480037] [<ffffffff817bf2b3>] __mutex_unlock_slowpath+0x83/0x180 [ 78.480037] [<ffffffff817bf3be>] mutex_unlock+0xe/0x10 [ 78.480037] [<ffffffff81376c91>] p_stop+0x51/0x90 [ 78.480037] [<ffffffff81211408>] seq_read+0x288/0x3d0 [ 78.480037] [<ffffffff811e9d9e>] vfs_read+0x9e/0x170 [ 78.480037] [<ffffffff811ea8cc>] SyS_read+0x4c/0xa0 [ 78.480037] [<ffffffff817ccc9d>] system_call_fastpath+0x1a/0x1f Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2013-10-16apparmor: fix memleak of the profile hashJohn Johansen1-0/+1
BugLink: http://bugs.launchpad.net/bugs/1235523 This fixes the following kmemleak trace: unreferenced object 0xffff8801e8c35680 (size 32): comm "apparmor_parser", pid 691, jiffies 4294895667 (age 13230.876s) hex dump (first 32 bytes): e0 d3 4e b5 ac 6d f4 ed 3f cb ee 48 1c fd 40 cf ..N..m..?..H..@. 5b cc e9 93 00 00 00 00 00 00 00 00 00 00 00 00 [............... backtrace: [<ffffffff817a97ee>] kmemleak_alloc+0x4e/0xb0 [<ffffffff811ca9f3>] __kmalloc+0x103/0x290 [<ffffffff8138acbc>] aa_calc_profile_hash+0x6c/0x150 [<ffffffff8138074d>] aa_unpack+0x39d/0xd50 [<ffffffff8137eced>] aa_replace_profiles+0x3d/0xd80 [<ffffffff81376937>] profile_replace+0x37/0x50 [<ffffffff811e9f2d>] vfs_write+0xbd/0x1e0 [<ffffffff811ea96c>] SyS_write+0x4c/0xa0 [<ffffffff817ccb1d>] system_call_fastpath+0x1a/0x1f [<ffffffffffffffff>] 0xffffffffffffffff Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2013-09-30apparmor: fix suspicious RCU usage warning in policy.c/policy.hJohn Johansen2-2/+5
The recent 3.12 pull request for apparmor was missing a couple rcu _protected access modifiers. Resulting in the follow suspicious RCU usage [ 29.804534] [ INFO: suspicious RCU usage. ] [ 29.804539] 3.11.0+ #5 Not tainted [ 29.804541] ------------------------------- [ 29.804545] security/apparmor/include/policy.h:363 suspicious rcu_dereference_check() usage! [ 29.804548] [ 29.804548] other info that might help us debug this: [ 29.804548] [ 29.804553] [ 29.804553] rcu_scheduler_active = 1, debug_locks = 1 [ 29.804558] 2 locks held by apparmor_parser/1268: [ 29.804560] #0: (sb_writers#9){.+.+.+}, at: [<ffffffff81120a4c>] file_start_write+0x27/0x29 [ 29.804576] #1: (&ns->lock){+.+.+.}, at: [<ffffffff811f5d88>] aa_replace_profiles+0x166/0x57c [ 29.804589] [ 29.804589] stack backtrace: [ 29.804595] CPU: 0 PID: 1268 Comm: apparmor_parser Not tainted 3.11.0+ #5 [ 29.804599] Hardware name: ASUSTeK Computer Inc. UL50VT /UL50VT , BIOS 217 03/01/2010 [ 29.804602] 0000000000000000 ffff8800b95a1d90 ffffffff8144eb9b ffff8800b94db540 [ 29.804611] ffff8800b95a1dc0 ffffffff81087439 ffff880138cc3a18 ffff880138cc3a18 [ 29.804619] ffff8800b9464a90 ffff880138cc3a38 ffff8800b95a1df0 ffffffff811f5084 [ 29.804628] Call Trace: [ 29.804636] [<ffffffff8144eb9b>] dump_stack+0x4e/0x82 [ 29.804642] [<ffffffff81087439>] lockdep_rcu_suspicious+0xfc/0x105 [ 29.804649] [<ffffffff811f5084>] __aa_update_replacedby+0x53/0x7f [ 29.804655] [<ffffffff811f5408>] __replace_profile+0x11f/0x1ed [ 29.804661] [<ffffffff811f6032>] aa_replace_profiles+0x410/0x57c [ 29.804668] [<ffffffff811f16d4>] profile_replace+0x35/0x4c [ 29.804674] [<ffffffff81120fa3>] vfs_write+0xad/0x113 [ 29.804680] [<ffffffff81121609>] SyS_write+0x44/0x7a [ 29.804687] [<ffffffff8145bfd2>] system_call_fastpath+0x16/0x1b [ 29.804691] [ 29.804694] =============================== [ 29.804697] [ INFO: suspicious RCU usage. ] [ 29.804700] 3.11.0+ #5 Not tainted [ 29.804703] ------------------------------- [ 29.804706] security/apparmor/policy.c:566 suspicious rcu_dereference_check() usage! [ 29.804709] [ 29.804709] other info that might help us debug this: [ 29.804709] [ 29.804714] [ 29.804714] rcu_scheduler_active = 1, debug_locks = 1 [ 29.804718] 2 locks held by apparmor_parser/1268: [ 29.804721] #0: (sb_writers#9){.+.+.+}, at: [<ffffffff81120a4c>] file_start_write+0x27/0x29 [ 29.804733] #1: (&ns->lock){+.+.+.}, at: [<ffffffff811f5d88>] aa_replace_profiles+0x166/0x57c [ 29.804744] [ 29.804744] stack backtrace: [ 29.804750] CPU: 0 PID: 1268 Comm: apparmor_parser Not tainted 3.11.0+ #5 [ 29.804753] Hardware name: ASUSTeK Computer Inc. UL50VT /UL50VT , BIOS 217 03/01/2010 [ 29.804756] 0000000000000000 ffff8800b95a1d80 ffffffff8144eb9b ffff8800b94db540 [ 29.804764] ffff8800b95a1db0 ffffffff81087439 ffff8800b95b02b0 0000000000000000 [ 29.804772] ffff8800b9efba08 ffff880138cc3a38 ffff8800b95a1dd0 ffffffff811f4f94 [ 29.804779] Call Trace: [ 29.804786] [<ffffffff8144eb9b>] dump_stack+0x4e/0x82 [ 29.804791] [<ffffffff81087439>] lockdep_rcu_suspicious+0xfc/0x105 [ 29.804798] [<ffffffff811f4f94>] aa_free_replacedby_kref+0x4d/0x62 [ 29.804804] [<ffffffff811f4f47>] ? aa_put_namespace+0x17/0x17 [ 29.804810] [<ffffffff811f4f0b>] kref_put+0x36/0x40 [ 29.804816] [<ffffffff811f5423>] __replace_profile+0x13a/0x1ed [ 29.804822] [<ffffffff811f6032>] aa_replace_profiles+0x410/0x57c [ 29.804829] [<ffffffff811f16d4>] profile_replace+0x35/0x4c [ 29.804835] [<ffffffff81120fa3>] vfs_write+0xad/0x113 [ 29.804840] [<ffffffff81121609>] SyS_write+0x44/0x7a [ 29.804847] [<ffffffff8145bfd2>] system_call_fastpath+0x16/0x1b Reported-by: miles.lane@gmail.com CC: paulmck@linux.vnet.ibm.com Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2013-09-30apparmor: Use shash crypto API interface for profile hashesTyler Hicks1-18/+16
Use the shash interface, rather than the hash interface, when hashing AppArmor profiles. The shash interface does not use scatterlists and it is a better fit for what AppArmor needs. This fixes a kernel paging BUG when aa_calc_profile_hash() is passed a buffer from vmalloc(). The hash interface requires callers to handle vmalloc() buffers differently than what AppArmor was doing. Due to vmalloc() memory not being physically contiguous, each individual page behind the buffer must be assigned to a scatterlist with sg_set_page() and then the scatterlist passed to crypto_hash_update(). The shash interface does not have that limitation and allows vmalloc() and kmalloc() buffers to be handled in the same manner. BugLink: https://launchpad.net/bugs/1216294/ BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=62261 Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2013-09-07Merge branch 'next' of ↵Linus Torvalds20-409/+1502
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security Pull security subsystem updates from James Morris: "Nothing major for this kernel, just maintenance updates" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (21 commits) apparmor: add the ability to report a sha1 hash of loaded policy apparmor: export set of capabilities supported by the apparmor module apparmor: add the profile introspection file to interface apparmor: add an optional profile attachment string for profiles apparmor: add interface files for profiles and namespaces apparmor: allow setting any profile into the unconfined state apparmor: make free_profile available outside of policy.c apparmor: rework namespace free path apparmor: update how unconfined is handled apparmor: change how profile replacement update is done apparmor: convert profile lists to RCU based locking apparmor: provide base for multiple profiles to be replaced at once apparmor: add a features/policy dir to interface apparmor: enable users to query whether apparmor is enabled apparmor: remove minimum size check for vmalloc() Smack: parse multiple rules per write to load2, up to PAGE_SIZE-1 bytes Smack: network label match fix security: smack: add a hash table to quicken smk_find_entry() security: smack: fix memleak in smk_write_rules_list() xattr: Constify ->name member of "struct xattr". ...
2013-08-20module/lsm: Have apparmor module parameters work with no argsSteven Rostedt1-0/+2
The apparmor module parameters for param_ops_aabool and param_ops_aalockpolicy are both based off of the param_ops_bool, and can handle a NULL value passed in as val. Have it enable the new KERNEL_PARAM_FL_NOARGS flag to allow the parameters to be set without having to state "=y" or "=1". Cc: John Johansen <john.johansen@canonical.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-08-14apparmor: add the ability to report a sha1 hash of loaded policyJohn Johansen8-6/+199
Provide userspace the ability to introspect a sha1 hash value for each profile currently loaded. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-08-14apparmor: export set of capabilities supported by the apparmor moduleJohn Johansen4-1/+15
Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-08-14apparmor: add the profile introspection file to interfaceJohn Johansen1-0/+236
Add the dynamic namespace relative profiles file to the interace, to allow introspection of loaded profiles and their modes. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2013-08-14apparmor: add an optional profile attachment string for profilesJohn Johansen4-0/+40
Add the ability to take in and report a human readable profile attachment string for profiles so that attachment specifications can be easily inspected. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-08-14apparmor: add interface files for profiles and namespacesJohn Johansen7-29/+436
Add basic interface files to access namespace and profile information. The interface files are created when a profile is loaded and removed when the profile or namespace is removed. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-08-14apparmor: allow setting any profile into the unconfined stateJohn Johansen5-9/+22
Allow emulating the default profile behavior from boot, by allowing loading of a profile in the unconfined state into a new NS. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-08-14apparmor: make free_profile available outside of policy.cJohn Johansen3-7/+7
Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-08-14apparmor: rework namespace free pathJohn Johansen2-35/+10
namespaces now completely use the unconfined profile to track the refcount and rcu freeing cycle. So rework the code to simplify (track everything through the profile path right up to the end), and move the rcu_head from policy base to profile as the namespace no longer needs it. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-08-14apparmor: update how unconfined is handledJohn Johansen3-83/+67
ns->unconfined is being used read side without locking, nor rcu but is being updated when a namespace is removed. This works for the root ns which is never removed but has a race window and can cause failures when children namespaces are removed. Also ns and ns->unconfined have a circular refcounting dependency that is problematic and must be broken. Currently this is done incorrectly when the namespace is destroyed. Fix this by forward referencing unconfined via the replacedby infrastructure instead of directly updating the ns->unconfined pointer. Remove the circular refcount dependency by making the ns and its unconfined profile share the same refcount. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-08-14apparmor: change how profile replacement update is doneJohn Johansen6-87/+125
remove the use of replaced by chaining and move to profile invalidation and lookup to handle task replacement. Replacement chaining can result in large chains of profiles being pinned in memory when one profile in the chain is use. With implicit labeling this will be even more of a problem, so move to a direct lookup method. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-08-14apparmor: convert profile lists to RCU based lockingJohn Johansen4-111/+167
Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-08-14apparmor: provide base for multiple profiles to be replaced at onceJohn Johansen4-146/+283
previously profiles had to be loaded one at a time, which could result in cases where a replacement of a set would partially succeed, and then fail resulting in inconsistent policy. Allow multiple profiles to replaced "atomically" so that the replacement either succeeds or fails for the entire set of profiles. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-08-14apparmor: add a features/policy dir to interfaceJohn Johansen1-0/+5
Add a policy directory to features to contain features that can affect policy compilation but do not affect mediation. Eg of such features would be types of dfa compression supported, etc. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2013-08-14apparmor: enable users to query whether apparmor is enabledJohn Johansen1-1/+1
Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-08-14apparmor: remove minimum size check for vmalloc()Tetsuo Handa1-5/+0
This is a follow-up to commit b5b3ee6c "apparmor: no need to delay vfree()". Since vmalloc() will do "size = PAGE_ALIGN(size);", we don't need to check for "size >= sizeof(struct work_struct)". Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-05-12apparmor: no need to delay vfree()Al Viro1-21/+3
vfree() can be called from interrupt contexts now Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2013-04-28apparmor: fix fully qualified name parsingJohn Johansen1-2/+4
currently apparmor name parsing is only correctly handling :<NS>:<profile> but :<NS>://<profile> is also a valid form and what is exported to userspace. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-04-28apparmor: fix setprocattr arg processing for onexecJohn Johansen1-16/+21
the exec file isn't processing its command arg. It should only set be responding to a command of exec. Also cleanup setprocattr some more while we are at it. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-04-28apparmor: localize getting the security context to a few macrosJohn Johansen4-21/+24
Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2013-04-28apparmor: fix sparse warningsJohn Johansen2-11/+11
Fix a couple of warning reported by sparse Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-04-28apparmor: Fix smatch warning in aa_remove_profilesJohn Johansen1-8/+6
smatch reports error: potential NULL dereference 'ns'. this can not actually occur because it relies on aa_split_fqname setting both ns_name and name as null but ns_name will actually always have a value in this case. so remove the unnecessary if (ns_name) conditional that is resulting in the false positive further down. Signed-off-by: John Johansen <john.johansen@canonical.com>
2013-04-28apparmor: fix the audit type tableJohn Johansen1-1/+1
The audit type table is missing a comma so that KILLED comes out as KILLEDAUTO. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Steve Beattie <sbeattie@ubuntu.com>
2013-04-28apparmor: reserve and mask off the top 8 bits of the base fieldJohn Johansen1-7/+9
The top 8 bits of the base field have never been used, in fact can't be used, by the current 'dfa16' format. However they will be used in the future as flags, so mask them off when using base as an index value. Note: the use of the top 8 bits, without masking is trapped by the verify checks that base entries are within the size bounds. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2013-04-28apparmor: move the free_profile fn ahead of aa_alloc_profileJohn Johansen1-75/+75
Move the free_profile fn ahead of aa_alloc_profile so it can be used in aa_alloc_profile without a forward declaration. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>