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* fix apparmor dereferencing potentially freed dentry, sanitize __d_path() APIAl Viro2011-12-061-27/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | __d_path() API is asking for trouble and in case of apparmor d_namespace_path() getting just that. The root cause is that when __d_path() misses the root it had been told to look for, it stores the location of the most remote ancestor in *root. Without grabbing references. Sure, at the moment of call it had been pinned down by what we have in *path. And if we raced with umount -l, we could have very well stopped at vfsmount/dentry that got freed as soon as prepend_path() dropped vfsmount_lock. It is safe to compare these pointers with pre-existing (and known to be still alive) vfsmount and dentry, as long as all we are asking is "is it the same address?". Dereferencing is not safe and apparmor ended up stepping into that. d_namespace_path() really wants to examine the place where we stopped, even if it's not connected to our namespace. As the result, it looked at ->d_sb->s_magic of a dentry that might've been already freed by that point. All other callers had been careful enough to avoid that, but it's really a bad interface - it invites that kind of trouble. The fix is fairly straightforward, even though it's bigger than I'd like: * prepend_path() root argument becomes const. * __d_path() is never called with NULL/NULL root. It was a kludge to start with. Instead, we have an explicit function - d_absolute_root(). Same as __d_path(), except that it doesn't get root passed and stops where it stops. apparmor and tomoyo are using it. * __d_path() returns NULL on path outside of root. The main caller is show_mountinfo() and that's precisely what we pass root for - to skip those outside chroot jail. Those who don't want that can (and do) use d_path(). * __d_path() root argument becomes const. Everyone agrees, I hope. * apparmor does *NOT* try to use __d_path() or any of its variants when it sees that path->mnt is an internal vfsmount. In that case it's definitely not mounted anywhere and dentry_path() is exactly what we want there. Handling of sysctl()-triggered weirdness is moved to that place. * if apparmor is asked to do pathname relative to chroot jail and __d_path() tells it we it's not in that jail, the sucker just calls d_absolute_path() instead. That's the other remaining caller of __d_path(), BTW. * seq_path_root() does _NOT_ return -ENAMETOOLONG (it's stupid anyway - the normal seq_file logics will take care of growing the buffer and redoing the call of ->show() just fine). However, if it gets path not reachable from root, it returns SEQ_SKIP. The only caller adjusted (i.e. stopped ignoring the return value as it used to do). Reviewed-by: John Johansen <john.johansen@canonical.com> ACKed-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Cc: stable@vger.kernel.org
* apparmor: sparse fix: include procattr.h in procattr.cJames Morris2011-09-091-0/+1
| | | | | | | | | | | Fix sparse warnings: security/apparmor/procattr.c:35:5: warning: symbol 'aa_getprocattr' was not declared. Should it be static? security/apparmor/procattr.c:113:5: warning: symbol 'aa_setprocattr_changehat' was not declared. Should it be static? security/apparmor/procattr.c:158:5: warning: symbol 'aa_setprocattr_changeprofile' was not declared. Should it be static? security/apparmor/procattr.c:166:5: warning: symbol 'aa_setprocattr_permipc' was not declared. Should it be static? Signed-off-by: James Morris <jmorris@namei.org> Acked-by: John Johansen <john.johansen@canonical.com>
* apparmor: sparse fix: rename shadowed variables in policy_unpack.cJames Morris2011-09-091-6/+6
| | | | | | | | | | | | Fix the following warnings: security/apparmor/policy_unpack.c:384:35: warning: symbol 'size' shadows an earlier one security/apparmor/policy_unpack.c:370:24: originally declared here security/apparmor/policy_unpack.c:443:29: warning: symbol 'tmp' shadows an earlier one security/apparmor/policy_unpack.c:434:21: originally declared here Signed-off-by: James Morris <jmorris@namei.org> Acked-by: John Johansen <john.johansen@canonical.com>
* apparmor: sparse fix: add apparmor.h to lib.cJames Morris2011-09-091-0/+1
| | | | | | | | | | Fix the following sparse warnings: security/apparmor/lib.c:37:6: warning: symbol 'aa_split_fqname' was not declared. Should it be static? security/apparmor/lib.c:63:6: warning: symbol 'aa_info_message' was not declared. Should it be static? security/apparmor/lib.c:83:6: warning: symbol 'kvmalloc' was not declared. Should it be static? security/apparmor/lib.c:123:6: warning: symbol 'kvfree' was not declared. Should it be static? Signed-off-by: James Morris <jmorris@namei.org>
* apparmor: sparse fix: include ipc.hJames Morris2011-09-091-0/+1
| | | | | | | | | | Include ipc.h to eliminate sparse warnings. security/apparmor/ipc.c:61:5: warning: symbol 'aa_may_ptrace' was not declared. Should it be static? security/apparmor/ipc.c:83:5: warning: symbol 'aa_ptrace' was not declared. Should it be static Signed-off-by: James Morris <jmorris@namei.org> Acked-by: John Johansen <john.johansen@canonical.com>
* apparmor: sparse fix: make aa_create_aafs staticJames Morris2011-09-091-1/+1
| | | | | | | Sparse fix: make aa_create_aafs static. Signed-off-by: James Morris <jmorris@namei.org> Acked-by: John Johansen <john.johansen@canonical.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2011-07-272-2/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: (54 commits) tpm_nsc: Fix bug when loading multiple TPM drivers tpm: Move tpm_tis_reenable_interrupts out of CONFIG_PNP block tpm: Fix compilation warning when CONFIG_PNP is not defined TOMOYO: Update kernel-doc. tpm: Fix a typo tpm_tis: Probing function for Intel iTPM bug tpm_tis: Fix the probing for interrupts tpm_tis: Delay ACPI S3 suspend while the TPM is busy tpm_tis: Re-enable interrupts upon (S3) resume tpm: Fix display of data in pubek sysfs entry tpm_tis: Add timeouts sysfs entry tpm: Adjust interface timeouts if they are too small tpm: Use interface timeouts returned from the TPM tpm_tis: Introduce durations sysfs entry tpm: Adjust the durations if they are too small tpm: Use durations returned from TPM TOMOYO: Enable conditional ACL. TOMOYO: Allow using argv[]/envp[] of execve() as conditions. TOMOYO: Allow using executable's realpath and symlink's target as conditions. TOMOYO: Allow using owner/group etc. of file objects as conditions. ... Fix up trivial conflict in security/tomoyo/realpath.c
| * AppArmor: Fix masking of capabilities in complain modeJohn Johansen2011-06-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | AppArmor is masking the capabilities returned by capget against the capabilities mask in the profile. This is wrong, in complain mode the profile has effectively all capabilities, as the profile restrictions are not being enforced, merely tested against to determine if an access is known by the profile. This can result in the wrong behavior of security conscience applications like sshd which examine their capability set, and change their behavior accordingly. In this case because of the masked capability set being returned sshd fails due to DAC checks, even when the profile is in complain mode. Kernels affected: 2.6.36 - 3.0. Signed-off-by: John Johansen <john.johansen@canonical.com>
| * AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lockJohn Johansen2011-06-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The pointer returned from tracehook_tracer_task() is only valid inside the rcu_read_lock. However the tracer pointer obtained is being passed to aa_may_ptrace outside of the rcu_read_lock critical section. Mover the aa_may_ptrace test into the rcu_read_lock critical section, to fix this. Kernels affected: 2.6.36 - 3.0 Reported-by: Oleg Nesterov <oleg@redhat.com> Cc: stable@kernel.org Signed-off-by: John Johansen <john.johansen@canonical.com>
* | Merge branch 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/miscLinus Torvalds2011-07-221-1/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc: (39 commits) ptrace: do_wait(traced_leader_killed_by_mt_exec) can block forever ptrace: fix ptrace_signal() && STOP_DEQUEUED interaction connector: add an event for monitoring process tracers ptrace: dont send SIGSTOP on auto-attach if PT_SEIZED ptrace: mv send-SIGSTOP from do_fork() to ptrace_init_task() ptrace_init_task: initialize child->jobctl explicitly has_stopped_jobs: s/task_is_stopped/SIGNAL_STOP_STOPPED/ ptrace: make former thread ID available via PTRACE_GETEVENTMSG after PTRACE_EVENT_EXEC stop ptrace: wait_consider_task: s/same_thread_group/ptrace_reparented/ ptrace: kill real_parent_is_ptracer() in in favor of ptrace_reparented() ptrace: ptrace_reparented() should check same_thread_group() redefine thread_group_leader() as exit_signal >= 0 do not change dead_task->exit_signal kill task_detached() reparent_leader: check EXIT_DEAD instead of task_detached() make do_notify_parent() __must_check, update the callers __ptrace_detach: avoid task_detached(), check do_notify_parent() kill tracehook_notify_death() make do_notify_parent() return bool ptrace: s/tracehook_tracer_task()/ptrace_parent()/ ...
| * | ptrace: s/tracehook_tracer_task()/ptrace_parent()/Tejun Heo2011-06-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | tracehook.h is on the way out. Rename tracehook_tracer_task() to ptrace_parent() and move it from tracehook.h to ptrace.h. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: John Johansen <john.johansen@canonical.com> Cc: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
* | | net: remove mm.h inclusion from netdevice.hAlexey Dobriyan2011-06-211-0/+1
| |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove linux/mm.h inclusion from netdevice.h -- it's unused (I've checked manually). To prevent mm.h inclusion via other channels also extract "enum dma_data_direction" definition into separate header. This tiny piece is what gluing netdevice.h with mm.h via "netdevice.h => dmaengine.h => dma-mapping.h => scatterlist.h => mm.h". Removal of mm.h from scatterlist.h was tried and was found not feasible on most archs, so the link was cutoff earlier. Hope people are OK with tiny include file. Note, that mm_types.h is still dragged in, but it is a separate story. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | AppArmor: Fix sleep in invalid context from task_setrlimitJohn Johansen2011-06-091-1/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Affected kernels 2.6.36 - 3.0 AppArmor may do a GFP_KERNEL memory allocation with task_lock(tsk->group_leader); held when called from security_task_setrlimit. This will only occur when the task's current policy has been replaced, and the task's creds have not been updated before entering the LSM security_task_setrlimit() hook. BUG: sleeping function called from invalid context at mm/slub.c:847 in_atomic(): 1, irqs_disabled(): 0, pid: 1583, name: cupsd 2 locks held by cupsd/1583: #0: (tasklist_lock){.+.+.+}, at: [<ffffffff8104dafa>] do_prlimit+0x61/0x189 #1: (&(&p->alloc_lock)->rlock){+.+.+.}, at: [<ffffffff8104db2d>] do_prlimit+0x94/0x189 Pid: 1583, comm: cupsd Not tainted 3.0.0-rc2-git1 #7 Call Trace: [<ffffffff8102ebf2>] __might_sleep+0x10d/0x112 [<ffffffff810e6f46>] slab_pre_alloc_hook.isra.49+0x2d/0x33 [<ffffffff810e7bc4>] kmem_cache_alloc+0x22/0x132 [<ffffffff8105b6e6>] prepare_creds+0x35/0xe4 [<ffffffff811c0675>] aa_replace_current_profile+0x35/0xb2 [<ffffffff811c4d2d>] aa_current_profile+0x45/0x4c [<ffffffff811c4d4d>] apparmor_task_setrlimit+0x19/0x3a [<ffffffff811beaa5>] security_task_setrlimit+0x11/0x13 [<ffffffff8104db6b>] do_prlimit+0xd2/0x189 [<ffffffff8104dea9>] sys_setrlimit+0x3b/0x48 [<ffffffff814062bb>] system_call_fastpath+0x16/0x1b Signed-off-by: John Johansen <john.johansen@canonical.com> Reported-by: Miles Lane <miles.lane@gmail.com> Cc: stable@kernel.org Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: fix oops in apparmor_setprocattrKees Cook2011-06-011-1/+2
| | | | | | | | | | | | | | | When invalid parameters are passed to apparmor_setprocattr a NULL deref oops occurs when it tries to record an audit message. This is because it is passing NULL for the profile parameter for aa_audit. But aa_audit now requires that the profile passed is not NULL. Fix this by passing the current profile on the task that is trying to setprocattr. Signed-off-by: Kees Cook <kees@ubuntu.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Cc: stable@kernel.org Signed-off-by: James Morris <jmorris@namei.org>
* Create Documentation/security/,Randy Dunlap2011-05-192-3/+3
| | | | | | | | move LSM-, credentials-, and keys-related files from Documentation/ to Documentation/security/, add Documentation/security/00-INDEX, and update all occurrences of Documentation/<moved_file> to Documentation/security/<moved_file>.
* Fix common misspellingsLucas De Marchi2011-03-312-2/+2
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* userns: security: make capabilities relative to the user namespaceSerge E. Hallyn2011-03-231-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Introduce ns_capable to test for a capability in a non-default user namespace. - Teach cap_capable to handle capabilities in a non-default user namespace. The motivation is to get to the unprivileged creation of new namespaces. It looks like this gets us 90% of the way there, with only potential uid confusion issues left. I still need to handle getting all caps after creation but otherwise I think I have a good starter patch that achieves all of your goals. Changelog: 11/05/2010: [serge] add apparmor 12/14/2010: [serge] fix capabilities to created user namespaces Without this, if user serge creates a user_ns, he won't have capabilities to the user_ns he created. THis is because we were first checking whether his effective caps had the caps he needed and returning -EPERM if not, and THEN checking whether he was the creator. Reverse those checks. 12/16/2010: [serge] security_real_capable needs ns argument in !security case 01/11/2011: [serge] add task_ns_capable helper 01/11/2011: [serge] add nsown_capable() helper per Bastian Blank suggestion 02/16/2011: [serge] fix a logic bug: the root user is always creator of init_user_ns, but should not always have capabilities to it! Fix the check in cap_capable(). 02/21/2011: Add the required user_ns parameter to security_capable, fixing a compile failure. 02/23/2011: Convert some macros to functions as per akpm comments. Some couldn't be converted because we can't easily forward-declare them (they are inline if !SECURITY, extern if SECURITY). Add a current_user_ns function so we can use it in capability.h without #including cred.h. Move all forward declarations together to the top of the #ifdef __KERNEL__ section, and use kernel-doc format. 02/23/2011: Per dhowells, clean up comment in cap_capable(). 02/23/2011: Per akpm, remove unreachable 'return -EPERM' in cap_capable. (Original written and signed off by Eric; latest, modified version acked by him) [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: export current_user_ns() for ecryptfs] [serge.hallyn@canonical.com: remove unneeded extra argument in selinux's task_has_capability] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Daniel Lezcano <daniel.lezcano@free.fr> Acked-by: David Howells <dhowells@redhat.com> Cc: James Morris <jmorris@namei.org> Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'security-next' of ↵James Morris2011-03-092-7/+33
|\ | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jj/apparmor-dev into next
| * AppArmor: kill unused macros in lsm.cShan Wei2011-03-081-2/+0
| | | | | | | | | | | | | | Remove unused macros. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
| * AppArmor: cleanup generated files correctlyMichal Hocko2011-03-081-1/+1
| | | | | | | | | | | | | | clean-files should be defined as a variable not a target. Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: John Johansen <john.johansen@canonical.com>
| * AppArmor: Cleanup make file to remove cruft and make it easier to readJohn Johansen2011-03-051-5/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | Cleanups based on comments from Sam Ravnborg, * remove references to the currently unused af_names.h * add rlim_names.h to clean-files: * rework cmd_make-XXX to make them more readable by adding comments, reworking the expressions to put logical components on individual lines, and keep lines < 80 characters. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Sam Ravnborg <sam@ravnborg.org>
* | Merge branch 'for-next' of ↵Linus Torvalds2011-01-131-1/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits) Documentation/trace/events.txt: Remove obsolete sched_signal_send. writeback: fix global_dirty_limits comment runtime -> real-time ppc: fix comment typo singal -> signal drivers: fix comment typo diable -> disable. m68k: fix comment typo diable -> disable. wireless: comment typo fix diable -> disable. media: comment typo fix diable -> disable. remove doc for obsolete dynamic-printk kernel-parameter remove extraneous 'is' from Documentation/iostats.txt Fix spelling milisec -> ms in snd_ps3 module parameter description Fix spelling mistakes in comments Revert conflicting V4L changes i7core_edac: fix typos in comments mm/rmap.c: fix comment sound, ca0106: Fix assignment to 'channel'. hrtimer: fix a typo in comment init/Kconfig: fix typo anon_inodes: fix wrong function name in comment fix comment typos concerning "consistent" poll: fix a typo in comment ... Fix up trivial conflicts in: - drivers/net/wireless/iwlwifi/iwl-core.c (moved to iwl-legacy.c) - fs/ext4/ext4.h Also fix missed 'diabled' typo in drivers/net/bnx2x/bnx2x.h while at it.
| * | Merge branch 'master' into for-nextJiri Kosina2010-12-222-3/+5
| |\| | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: MAINTAINERS arch/arm/mach-omap2/pm24xx.c drivers/scsi/bfa/bfa_fcpim.c Needed to update to apply fixes for which the old branch was too outdated.
| * | tree-wide: fix comment/printk typosUwe Kleine-König2010-11-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | "gadget", "through", "command", "maintain", "maintain", "controller", "address", "between", "initiali[zs]e", "instead", "function", "select", "already", "equal", "access", "management", "hierarchy", "registration", "interest", "relative", "memory", "offset", "already", Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | headers: kobject.h reduxAlexey Dobriyan2011-01-101-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | Remove kobject.h from files which don't need it, notably, sched.h and fs.h. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | headers: path.h reduxAlexey Dobriyan2011-01-101-2/+1
| |/ |/| | | | | | | | | | | Remove path.h from sched.h and other files. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | APPARMOR: Fix memory leak of apparmor_init()wzt.wzt@gmail.com2010-11-111-2/+4
| | | | | | | | | | | | | | | | | | set_init_cxt() allocted sizeof(struct aa_task_cxt) bytes for cxt, if register_security() failed, it will cause memory leak. Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* | APPARMOR: Fix memory leak of alloc_namespace()wzt.wzt@gmail.com2010-11-111-1/+1
|/ | | | | | | | | | policy->name is a substring of policy->hname, if prefix is not NULL, it will allocted strlen(prefix) + strlen(name) + 3 bytes to policy->hname in policy_init(). use kzfree(ns->base.name) will casue memory leak if alloc_namespace() failed. Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* fs: take dcache_lock inside __d_pathChristoph Hellwig2010-10-251-2/+0
| | | | | | | | All callers take dcache_lock just around the call to __d_path, so take the lock into it in preparation of getting rid of dcache_lock. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bklLinus Torvalds2010-10-221-3/+6
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl: vfs: make no_llseek the default vfs: don't use BKL in default_llseek llseek: automatically add .llseek fop libfs: use generic_file_llseek for simple_attr mac80211: disallow seeks in minstrel debug code lirc: make chardev nonseekable viotape: use noop_llseek raw: use explicit llseek file operations ibmasmfs: use generic_file_llseek spufs: use llseek in all file operations arm/omap: use generic_file_llseek in iommu_debug lkdtm: use generic_file_llseek in debugfs net/wireless: use generic_file_llseek in debugfs drm: use noop_llseek
| * llseek: automatically add .llseek fopArnd Bergmann2010-10-151-3/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
* | AppArmor: Ensure the size of the copy is < the buffer allocated to hold itJohn Johansen2010-10-211-1/+3
| | | | | | | | | | | | | | | | | | | | | | Actually I think in this case the appropriate thing to do is to BUG as there is currently a case (remove) where the alloc_size needs to be larger than the copy_size, and if copy_size is ever greater than alloc_size there is a mistake in the caller code. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees.cook@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* | .gitignore: ignore apparmor/rlim_names.hYong Zhang2010-10-211-0/+1
|/ | | | | | Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: Fix locking from removal of profile namespaceJohn Johansen2010-09-081-2/+4
| | | | | | | | | The locking for profile namespace removal is wrong, when removing a profile namespace, it needs to be removed from its parent's list. Lock the parent of namespace list instead of the namespace being removed. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: Fix splitting an fqname into separate namespace and profile namesJohn Johansen2010-09-081-1/+1
| | | | | | | | | | | | | | | | | | As per Dan Carpenter <error27@gmail.com> If we have a ns name without a following profile then in the original code it did "*ns_name = &name[1];". "name" is NULL so "*ns_name" is 0x1. That isn't useful and could cause an oops when this function is called from aa_remove_profiles(). Beyond this the assignment of the namespace name was wrong in the case where the profile name was provided as it was being set to &name[1] after name = skip_spaces(split + 1); Move the ns_name assignment before updating name for the split and also add skip_spaces, making the interface more robust. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: Fix security_task_setrlimit logic for 2.6.36 changesJohn Johansen2010-09-083-11/+15
| | | | | | | | | | | | 2.6.36 introduced the abilitiy to specify the task that is having its rlimits set. Update mediation to ensure that confined tasks can only set their own group_leader as expected by current policy. Add TODO note about extending policy to support setting other tasks rlimits. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: Drop hack to remove appended " (deleted)" stringJohn Johansen2010-09-081-27/+11
| | | | | | | | | The 2.6.36 kernel has refactored __d_path() so that it no longer appends " (deleted)" to unlinked paths. So drop the hack that was used to detect and remove the appended string. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2010-08-181-7/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: fs: brlock vfsmount_lock fs: scale files_lock lglock: introduce special lglock and brlock spin locks tty: fix fu_list abuse fs: cleanup files_lock locking fs: remove extra lookup in __lookup_hash fs: fs_struct rwlock to spinlock apparmor: use task path helpers fs: dentry allocation consolidation fs: fix do_lookup false negative mbcache: Limit the maximum number of cache entries hostfs ->follow_link() braino hostfs: dumb (and usually harmless) tpyo - strncpy instead of strlcpy remove SWRITE* I/O types kill BH_Ordered flag vfs: update ctime when changing the file's permission by setfacl cramfs: only unlock new inodes fix reiserfs_evict_inode end_writeback second call
| * apparmor: use task path helpersNick Piggin2010-08-181-7/+2
| | | | | | | | | | | | | | apparmor: use task path helpers Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | AppArmor: fix task_setrlimit prototypeJiri Slaby2010-08-171-2/+2
|/ | | | | | | | | | | | | | | | | After rlimits tree was merged we get the following errors: security/apparmor/lsm.c:663:2: warning: initialization from incompatible pointer type It is because AppArmor was merged in the meantime, but uses the old prototype. So fix it by adding struct task_struct as a first parameter of apparmor_task_setrlimit. NOTE that this is ONLY a compilation warning fix (and crashes caused by that). It needs proper handling in AppArmor depending on who is the 'task'. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: update for module_param_named API changeStephen Rothwell2010-08-111-12/+24
| | | | | | | | | | | Fixes these build errors: security/apparmor/lsm.c:701: error: 'param_ops_aabool' undeclared here (not in a function) security/apparmor/lsm.c:721: error: 'param_ops_aalockpolicy' undeclared here (not in a function) security/apparmor/lsm.c:729: error: 'param_ops_aauint' undeclared here (not in a function) Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* apparmor: depends on NETRandy Dunlap2010-08-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | SECURITY_APPARMOR should depend on NET since AUDIT needs (depends on) NET. Fixes 70-80 errors that occur when CONFIG_NET is not enabled, but APPARMOR selects AUDIT without qualification. E.g.: audit.c:(.text+0x33361): undefined reference to `netlink_unicast' (.text+0x333df): undefined reference to `netlink_unicast' audit.c:(.text+0x3341d): undefined reference to `skb_queue_tail' audit.c:(.text+0x33424): undefined reference to `kfree_skb' audit.c:(.text+0x334cb): undefined reference to `kfree_skb' audit.c:(.text+0x33597): undefined reference to `skb_put' audit.c:(.text+0x3369b): undefined reference to `__alloc_skb' audit.c:(.text+0x336d7): undefined reference to `kfree_skb' (.text+0x3374c): undefined reference to `__alloc_skb' auditfilter.c:(.text+0x35305): undefined reference to `skb_queue_tail' lsm_audit.c:(.text+0x2873): undefined reference to `init_net' lsm_audit.c:(.text+0x2878): undefined reference to `dev_get_by_index' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: fix build warnings for non-const use of get_task_credJames Morris2010-08-022-2/+2
| | | | | | Fix build warnings for non-const use of get_task_cred. Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: Enable configuring and building of the AppArmor security moduleJohn Johansen2010-08-023-0/+60
| | | | | | | Kconfig and Makefiles to enable configuration and building of AppArmor. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: update path_truncate method to latest versionJames Morris2010-08-021-2/+1
| | | | | | | Remove extraneous path_truncate arguments from the AppArmor hook, as they've been removed from the LSM API. Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: core policy routinesJohn Johansen2010-08-024-0/+1568
| | | | | | | | | | | | | | | | The basic routines and defines for AppArmor policy. AppArmor policy is defined by a few basic components. profiles - the basic unit of confinement contain all the information to enforce policy on a task Profiles tend to be named after an executable that they will attach to but this is not required. namespaces - a container for a set of profiles that will be used during attachment and transitions between profiles. sids - which provide a unique id for each profile Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: policy routines for loading and unpacking policyJohn Johansen2010-08-022-0/+723
| | | | | | | | | AppArmor policy is loaded in a platform independent flattened binary stream. Verify and unpack the data converting it to the internal format needed for enforcement. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: mediation of non file objectsJohn Johansen2010-08-026-0/+508
| | | | | | | | | | | | | | | | | | | | | | | ipc: AppArmor ipc is currently limited to mediation done by file mediation and basic ptrace tests. Improved mediation is a wip. rlimits: AppArmor provides basic abilities to set and control rlimits at a per profile level. Only resources specified in a profile are controled or set. AppArmor rules set the hard limit to a value <= to the current hard limit (ie. they can not currently raise hard limits), and if necessary will lower the soft limit to the new hard limit value. AppArmor does not track resource limits to reset them when a profile is left so that children processes inherit the limits set by the parent even if they are not confined by the same profile. Capabilities: AppArmor provides a per profile mask of capabilities, that will further restrict. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: LSM interface, and security module initializationJohn Johansen2010-08-021-0/+939
| | | | | | | | AppArmor hooks to interface with the LSM, module parameters and module initialization. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
* AppArmor: functions for domain transitionsJohn Johansen2010-08-022-0/+859
| | | | | | | | | | | | | | | | | | | | | | AppArmor routines for controling domain transitions, which can occur at exec or through self directed change_profile/change_hat calls. Unconfined tasks are checked at exec against the profiles in the confining profile namespace to determine if a profile should be attached to the task. Confined tasks execs are controlled by the profile which provides rules determining which execs are allowed and if so which profiles should be transitioned to. Self directed domain transitions allow a task to request transition to a given profile. If the transition is allowed then the profile will be applied, either immeditately or at exec time depending on the request. Immeditate self directed transitions have several security limitations but have uses in setting up stub transition profiles and other limited cases. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 03:19:32 +0000