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2013-02-22new helper: file_inode(file)Al Viro3-7/+7
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-25apparmor: fix IRQ stack overflow during free_profileJohn Johansen1-1/+23
BugLink: http://bugs.launchpad.net/bugs/1056078 Profile replacement can cause long chains of profiles to build up when the profile being replaced is pinned. When the pinned profile is finally freed, it puts the reference to its replacement, which may in turn nest another call to free_profile on the stack. Because this may happen for each profile in the replacedby chain this can result in a recusion that causes the stack to overflow. Break this nesting by directly walking the chain of replacedby profiles (ie. use iteration instead of recursion to free the list). This results in at most 2 levels of free_profile being called, while freeing a replacedby chain. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-10-17apparmor: fix apparmor OOPS in audit_log_untrustedstring+0x1c/0x40John Johansen1-1/+1
The capability defines have moved causing the auto generated names of capabilities that apparmor uses in logging to be incorrect. Fix the autogenerated table source to uapi/linux/capability.h Reported-by: YanHong <clouds.yan@gmail.com> Reported-by: Krzysztof Kolasa <kkolasa@winsoft.pl> Analyzed-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: David Howells <dhowells@redhat.com> Acked-by: James Morris <james.l.morris@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-04UAPI: (Scripted) Disintegrate include/asm-genericDavid Howells1-1/+1
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2012-10-02Merge branch 'for-linus' of ↵Linus Torvalds5-11/+13
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull user namespace changes from Eric Biederman: "This is a mostly modest set of changes to enable basic user namespace support. This allows the code to code to compile with user namespaces enabled and removes the assumption there is only the initial user namespace. Everything is converted except for the most complex of the filesystems: autofs4, 9p, afs, ceph, cifs, coda, fuse, gfs2, ncpfs, nfs, ocfs2 and xfs as those patches need a bit more review. The strategy is to push kuid_t and kgid_t values are far down into subsystems and filesystems as reasonable. Leaving the make_kuid and from_kuid operations to happen at the edge of userspace, as the values come off the disk, and as the values come in from the network. Letting compile type incompatible compile errors (present when user namespaces are enabled) guide me to find the issues. The most tricky areas have been the places where we had an implicit union of uid and gid values and were storing them in an unsigned int. Those places were converted into explicit unions. I made certain to handle those places with simple trivial patches. Out of that work I discovered we have generic interfaces for storing quota by projid. I had never heard of the project identifiers before. Adding full user namespace support for project identifiers accounts for most of the code size growth in my git tree. Ultimately there will be work to relax privlige checks from "capable(FOO)" to "ns_capable(user_ns, FOO)" where it is safe allowing root in a user names to do those things that today we only forbid to non-root users because it will confuse suid root applications. While I was pushing kuid_t and kgid_t changes deep into the audit code I made a few other cleanups. I capitalized on the fact we process netlink messages in the context of the message sender. I removed usage of NETLINK_CRED, and started directly using current->tty. Some of these patches have also made it into maintainer trees, with no problems from identical code from different trees showing up in linux-next. After reading through all of this code I feel like I might be able to win a game of kernel trivial pursuit." Fix up some fairly trivial conflicts in netfilter uid/git logging code. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (107 commits) userns: Convert the ufs filesystem to use kuid/kgid where appropriate userns: Convert the udf filesystem to use kuid/kgid where appropriate userns: Convert ubifs to use kuid/kgid userns: Convert squashfs to use kuid/kgid where appropriate userns: Convert reiserfs to use kuid and kgid where appropriate userns: Convert jfs to use kuid/kgid where appropriate userns: Convert jffs2 to use kuid and kgid where appropriate userns: Convert hpfs to use kuid and kgid where appropriate userns: Convert btrfs to use kuid/kgid where appropriate userns: Convert bfs to use kuid/kgid where appropriate userns: Convert affs to use kuid/kgid wherwe appropriate userns: On alpha modify linux_to_osf_stat to use convert from kuids and kgids userns: On ia64 deal with current_uid and current_gid being kuid and kgid userns: On ppc convert current_uid from a kuid before printing. userns: Convert s390 getting uid and gid system calls to use kuid and kgid userns: Convert s390 hypfs to use kuid and kgid where appropriate userns: Convert binder ipc to use kuids userns: Teach security_path_chown to take kuids and kgids userns: Add user namespace support to IMA userns: Convert EVM to deal with kuids and kgids in it's hmac computation ...
2012-09-21userns: Teach security_path_chown to take kuids and kgidsEric W. Biederman1-1/+1
Don't make the security modules deal with raw user space uid and gids instead pass in a kuid_t and a kgid_t so that security modules only have to deal with internal kernel uids and gids. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: James Morris <james.l.morris@oracle.com> Cc: John Johansen <john.johansen@canonical.com> Cc: Kentaro Takeda <takedakn@nttdata.co.jp> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-09-21userns: Convert apparmor to use kuid and kgid where appropriateEric W. Biederman4-10/+12
Cc: John Johansen <john.johansen@canonical.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-09-01AppArmor: remove af_names.h from .gitignorePaul Bolle1-1/+0
Commit 4fdef2183e6598cc977a9bb9321ef99a44125da3 ("AppArmor: Cleanup make file to remove cruft and make it easier to read") removed all traces of af_names.h from the tree. Remove its entry in AppArmor's .gitignore file too. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-05-31split ->file_mmap() into ->mmap_addr()/->mmap_file()Al Viro1-11/+4
... i.e. file-dependent and address-dependent checks. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-05-31split cap_mmap_addr() out of cap_file_mmap()Al Viro1-1/+1
... switch callers. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-05-22Merge branch 'master' of git://git.infradead.org/users/eparis/selinux into nextJames Morris10-13/+21
Per pull request, for 3.5.
2012-05-18apparmor: fix long path failure due to disconnected pathJohn Johansen1-0/+2
BugLink: http://bugs.launchpad.net/bugs/955892 All failures from __d_path where being treated as disconnected paths, however __d_path can also fail when the generated pathname is too long. The initial ENAMETOOLONG error was being lost, and ENAMETOOLONG was only returned if the subsequent dentry_path call resulted in that error. Other wise if the path was split across a mount point such that the dentry_path fit within the buffer when the __d_path did not the failure was treated as a disconnected path. Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-05-18apparmor: fix profile lookup for unconfinedJohn Johansen1-0/+4
BugLink: http://bugs.launchpad.net/bugs/978038 also affects apparmor portion of BugLink: http://bugs.launchpad.net/bugs/987371 The unconfined profile is not stored in the regular profile list, but change_profile and exec transitions may want access to it when setting up specialized transitions like switch to the unconfined profile of a new policy namespace. Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-04-14Fix execve behavior apparmor for PR_{GET,SET}_NO_NEW_PRIVSJohn Johansen1-4/+35
Add support for AppArmor to explicitly fail requested domain transitions if NO_NEW_PRIVS is set and the task is not unconfined. Transitions from unconfined are still allowed because this always results in a reduction of privileges. Acked-by: Eric Paris <eparis@redhat.com> Signed-off-by: Will Drewry <wad@chromium.org> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Andy Lutomirski <luto@amacapital.net> v18: new acked-by, new description Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-04-14Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privsAndy Lutomirski1-0/+4
With this change, calling prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) disables privilege granting operations at execve-time. For example, a process will not be able to execute a setuid binary to change their uid or gid if this bit is set. The same is true for file capabilities. Additionally, LSM_UNSAFE_NO_NEW_PRIVS is defined to ensure that LSMs respect the requested behavior. To determine if the NO_NEW_PRIVS bit is set, a task may call prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0); It returns 1 if set and 0 if it is not set. If any of the arguments are non-zero, it will return -1 and set errno to -EINVAL. (PR_SET_NO_NEW_PRIVS behaves similarly.) This functionality is desired for the proposed seccomp filter patch series. By using PR_SET_NO_NEW_PRIVS, it allows a task to modify the system call behavior for itself and its child tasks without being able to impact the behavior of a more privileged task. Another potential use is making certain privileged operations unprivileged. For example, chroot may be considered "safe" if it cannot affect privileged tasks. Note, this patch causes execve to fail when PR_SET_NO_NEW_PRIVS is set and AppArmor is in use. It is fixed in a subsequent patch. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Will Drewry <wad@chromium.org> Acked-by: Eric Paris <eparis@redhat.com> Acked-by: Kees Cook <keescook@chromium.org> v18: updated change desc v17: using new define values as per 3.4 Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-04-09LSM: do not initialize common_audit_data to 0Eric Paris8-8/+8
It isn't needed. If you don't set the type of the data associated with that type it is a pretty obvious programming bug. So why waste the cycles? Signed-off-by: Eric Paris <eparis@redhat.com>
2012-04-09apparmor: move task from common_audit_data to apparmor_audit_dataEric Paris3-3/+11
apparmor is the only LSM that uses the common_audit_data tsk field. Instead of making all LSMs pay for the stack space move the aa usage into the apparmor_audit_data. Signed-off-by: Eric Paris <eparis@redhat.com>
2012-04-09LSM: remove the COMMON_AUDIT_DATA_INIT type expansionEric Paris8-8/+8
Just open code it so grep on the source code works better. Signed-off-by: Eric Paris <eparis@redhat.com>
2012-04-09SELinux: rename dentry_open to file_openEric Paris1-2/+2
dentry_open takes a file, rename it to file_open Signed-off-by: Eric Paris <eparis@redhat.com>
2012-04-03lsm_audit: don't specify the audit pre/post callbacks in 'struct ↵Linus Torvalds1-3/+1
common_audit_data' It just bloats the audit data structure for no good reason, since the only time those fields are filled are just before calling the common_lsm_audit() function, which is also the only user of those fields. So just make them be the arguments to common_lsm_audit(), rather than bloating that structure that is passed around everywhere, and is initialized in hot paths. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-03LSM: shrink sizeof LSM specific portion of common_audit_dataEric Paris10-74/+116
Linus found that the gigantic size of the common audit data caused a big perf hit on something as simple as running stat() in a loop. This patch requires LSMs to declare the LSM specific portion separately rather than doing it in a union. Thus each LSM can be responsible for shrinking their portion and don't have to pay a penalty just because other LSMs have a bigger space requirement. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-28apparmor: Fix change_onexec when called from a confined taskJohn Johansen2-1/+4
Fix failure in aa_change_onexec api when the request is made from a confined task. This failure was caused by two problems The AA_MAY_ONEXEC perm was not being mapped correctly for this case. The executable name was being checked as second time instead of using the requested onexec profile name, which may not be the same as the exec profile name. This mistake can not be exploited to grant extra permission because of the above flaw where the ONEXEC permission was not being mapped so it will not be granted. BugLink: http://bugs.launchpad.net/bugs/963756 Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-03-19AppArmor: Fix location of const qualifier on generated string tablesTetsuo Handa1-2/+2
Signed-off-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-03-14AppArmor: add const qualifiers to string arraysJan Engelhardt4-7/+7
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-03-14AppArmor: Add ability to load extended policyJohn Johansen4-1/+50
Add the base support for the new policy extensions. This does not bring any additional functionality, or change current semantics. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-03-14AppArmor: Move path failure information into aa_get_name and renameJohn Johansen4-19/+29
Move the path name lookup failure messages into the main path name lookup routine, as the information is useful in more than just aa_path_perm. Also rename aa_get_name to aa_path_name as it is not getting a reference counted object with a corresponding put fn. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-03-14AppArmor: Update dfa matching routines.John Johansen3-4/+81
Update aa_dfa_match so that it doesn't result in an input string being walked twice (once to get its length and another time to match) Add a single step functions aa_dfa_next Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-03-14AppArmor: Minor cleanup of d_namespace_path to consolidate error handlingJohn Johansen1-10/+6
Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-03-14AppArmor: Retrieve the dentry_path for error reporting when path lookup failsJohn Johansen1-6/+9
When __d_path and d_absolute_path fail due to the name being outside of the current namespace no name is reported. Use dentry_path to provide some hint as to which file was being accessed. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-03-14AppArmor: Add const qualifiers to generated string tablesJohn Johansen1-2/+3
Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-03-14AppArmor: Fix oops in policy unpack auditingJohn Johansen1-2/+3
Post unpacking of policy a verification pass is made on x transition indexes. When this fails a call to audit_iface is made resulting in an oops, because audit_iface is expecting a valid buffer position but since the failure comes from post unpack verification there is none. Make the position argument optional so that audit_iface can be called from post unpack verification. Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-03-14AppArmor: Fix error returned when a path lookup is disconnectedJohn Johansen1-1/+1
The returning of -ESATLE when a path lookup fails as disconnected is wrong. Since AppArmor is rejecting the access return -EACCES instead. This also fixes a bug in complain (learning) mode where disconnected paths are denied because -ESTALE errors are not ignored causing failures that can change application behavior. Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-02-27AppArmor: Fix the error case for chroot relative path name lookupJohn Johansen1-3/+2
When a chroot relative pathname lookup fails it is falling through to do a d_absolute_path lookup. This is incorrect as d_absolute_path should only be used to lookup names for namespace absolute paths. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-02-27AppArmor: fix mapping of META_READ to audit and quiet flagsJohn Johansen1-2/+1
The mapping of AA_MAY_META_READ for the allow mask was also being mapped to the audit and quiet masks. This would result in some operations being audited when the should not. This flaw was hidden by the previous audit bug which would drop some messages that where supposed to be audited. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-02-27AppArmor: Fix underflow in xindex calculationJohn Johansen1-1/+1
If the xindex value stored in the accept tables is 0, the extraction of that value will result in an underflow (0 - 4). In properly compiled policy this should not happen for file rules but it may be possible for other rule types in the future. To exploit this underflow a user would have to be able to load a corrupt policy, which requires CAP_MAC_ADMIN, overwrite system policy in kernel memory or know of a compiler error resulting in the flaw being present for loaded policy (no such flaw is known at this time). Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-02-27AppArmor: Fix dropping of allowed operations that are force auditedJohn Johansen2-3/+3
The audit permission flag, that specifies an audit message should be provided when an operation is allowed, was being ignored in some cases. This is because the auto audit mode (which determines the audit mode from system flags) was incorrectly assigned the same value as audit mode. The shared value would result in messages that should be audited going through a second evaluation as to whether they should be audited based on the auto audit, resulting in some messages being dropped. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-02-27AppArmor: Add mising end of structure test to caps unpackingJohn Johansen1-0/+2
The unpacking of struct capsx is missing a check for the end of the caps structure. This can lead to unpack failures depending on what else is packed into the policy file being unpacked. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
2012-02-27AppArmor: export known rlimit names/value mappings in securityfsKees Cook4-6/+29
Since the parser needs to know which rlimits are known to the kernel, export the list via a mask file in the "rlimit" subdirectory in the securityfs "features" directory. Signed-off-by: Kees Cook <kees@ubuntu.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-02-27AppArmor: add "file" details to securityfsKees Cook2-0/+16
Create the "file" directory in the securityfs for tracking features related to files. Signed-off-by: Kees Cook <kees@ubuntu.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-02-27AppArmor: add initial "features" directory to securityfsKees Cook2-0/+65
This adds the "features" subdirectory to the AppArmor securityfs to display boolean features flags and the known capability mask. Signed-off-by: Kees Cook <kees@ubuntu.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-02-27AppArmor: refactor securityfs to use structuresKees Cook2-42/+114
Use a file tree structure to represent the AppArmor securityfs. Signed-off-by: Kees Cook <kees@ubuntu.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2012-01-14Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-securityLinus Torvalds1-4/+4
* 'for-linus' of git://selinuxproject.org/~jmorris/linux-security: capabilities: remove __cap_full_set definition security: remove the security_netlink_recv hook as it is equivalent to capable() ptrace: do not audit capability check when outputing /proc/pid/stat capabilities: remove task_ns_* functions capabitlies: ns_capable can use the cap helpers rather than lsm call capabilities: style only - move capable below ns_capable capabilites: introduce new has_ns_capabilities_noaudit capabilities: call has_ns_capability from has_capability capabilities: remove all _real_ interfaces capabilities: introduce security_capable_noaudit capabilities: reverse arguments to security_capable capabilities: remove the task from capable LSM hook entirely selinux: sparse fix: fix several warnings in the security server cod selinux: sparse fix: fix warnings in netlink code selinux: sparse fix: eliminate warnings for selinuxfs selinux: sparse fix: declare selinux_disable() in security.h selinux: sparse fix: move selinux_complete_init selinux: sparse fix: make selinux_secmark_refcount static SELinux: Fix RCU deref check warning in sel_netport_insert() Manually fix up a semantic mis-merge wrt security_netlink_recv(): - the interface was removed in commit fd7784615248 ("security: remove the security_netlink_recv hook as it is equivalent to capable()") - a new user of it appeared in commit a38f7907b926 ("crypto: Add userspace configuration API") causing no automatic merge conflict, but Eric Paris pointed out the issue.
2012-01-13module_param: make bool parameters really bool (drivers & misc)Rusty Russell2-11/+11
module_param(bool) used to counter-intuitively take an int. In fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy trick. It's time to remove the int/unsigned int option. For this version it'll simply give a warning, but it'll break next kernel version. Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-01-10Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-securityLinus Torvalds2-4/+4
* 'for-linus' of git://selinuxproject.org/~jmorris/linux-security: (32 commits) ima: fix invalid memory reference ima: free duplicate measurement memory security: update security_file_mmap() docs selinux: Casting (void *) value returned by kmalloc is useless apparmor: fix module parameter handling Security: tomoyo: add .gitignore file tomoyo: add missing rcu_dereference() apparmor: add missing rcu_dereference() evm: prevent racing during tfm allocation evm: key must be set once during initialization mpi/mpi-mpow: NULL dereference on allocation failure digsig: build dependency fix KEYS: Give key types their own lockdep class for key->sem TPM: fix transmit_cmd error logic TPM: NSC and TIS drivers X86 dependency fix TPM: Export wait_for_stat for other vendor specific drivers TPM: Use vendor specific function for status probe tpm_tis: add delay after aborting command tpm_tis: Check return code from getting timeouts/durations tpm: Introduce function to poll for result of self test ... Fix up trivial conflict in lib/Makefile due to addition of CONFIG_MPI and SIGSIG next to CONFIG_DQL addition.
2012-01-09Merge branch 'next' into for-linusJames Morris2-4/+4
Conflicts: security/integrity/evm/evm_crypto.c Resolved upstream fix vs. next conflict manually. Signed-off-by: James Morris <jmorris@namei.org>
2012-01-06switch security_path_chmod() to struct path *Al Viro1-4/+3
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-05capabilities: remove the task from capable LSM hook entirelyEric Paris1-4/+4
The capabilities framework is based around credentials, not necessarily the current task. Yet we still passed the current task down into LSMs from the security_capable() LSM hook as if it was a meaningful portion of the security decision. This patch removes the 'generic' passing of current and instead forces individual LSMs to use current explicitly if they think it is appropriate. In our case those LSMs are SELinux and AppArmor. I believe the AppArmor use of current is incorrect, but that is wholely unrelated to this patch. This patch does not change what AppArmor does, it just makes it clear in the AppArmor code that it is doing it. The SELinux code still uses current in it's audit message, which may also be wrong and needs further investigation. Again this is NOT a change, it may have always been wrong, this patch just makes it clear what is happening. Signed-off-by: Eric Paris <eparis@redhat.com>
2012-01-03switch ->path_mknod() to umode_tAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03switch ->path_mkdir() to umode_tAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03switch securityfs_create_file() to umode_tAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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