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* Merge branch 'next' into for-linusJames Morris2010-03-0111-265/+302
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| * SELinux: Make selinux_kernel_create_files_as() shouldn't just always return 0David Howells2010-02-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | Make selinux_kernel_create_files_as() return an error when it gets one, rather than unconditionally returning 0. Without this, cachefiles doesn't return an error if the SELinux policy doesn't let it create files with the label of the directory at the base of the cache. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * Security: add static to security_ops and default_security_ops variablewzt.wzt@gmail.com2010-02-241-12/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Enhance the security framework to support resetting the active security module. This eliminates the need for direct use of the security_ops and default_security_ops variables outside of security.c, so make security_ops and default_security_ops static. Also remove the secondary_ops variable as a cleanup since there is no use for that. secondary_ops was originally used by SELinux to call the "secondary" security module (capability or dummy), but that was replaced by direct calls to capability and the only remaining use is to save and restore the original security ops pointer value if SELinux is disabled by early userspace based on /etc/selinux/config. Further, if we support this directly in the security framework, then we can just use &default_security_ops for this purpose since that is now available. Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * selinux: libsepol: remove dead code in check_avtab_hierarchy_callback()KaiGai Kohei2010-02-221-4/+39
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch revert the commit of 7d52a155e38d5a165759dbbee656455861bf7801 which removed a part of type_attribute_bounds_av as a dead code. However, at that time, we didn't find out the target side boundary allows to handle some of pseudo /proc/<pid>/* entries with its process's security context well. Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> -- security/selinux/ss/services.c | 43 ++++++++++++++++++++++++++++++++++++--- 1 files changed, 39 insertions(+), 4 deletions(-) Signed-off-by: James Morris <jmorris@namei.org>
| * security: fix a couple of sparse warningsJames Morris2010-02-161-2/+3
| | | | | | | | | | | | | | | | | | | | Fix a couple of sparse warnings for callers of context_struct_to_string, which takes a *u32, not an *int. These cases are harmless as the values are not used. Signed-off-by: James Morris <jmorris@namei.org> Acked-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
| * selinux: fix memory leak in sel_make_boolsXiaotian Feng2010-02-091-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In sel_make_bools, kernel allocates memory for bool_pending_names[i] with security_get_bools. So if we just free bool_pending_names, those memories for bool_pending_names[i] will be leaked. This patch resolves dozens of following kmemleak report after resuming from suspend: unreferenced object 0xffff88022e4c7380 (size 32): comm "init", pid 1, jiffies 4294677173 backtrace: [<ffffffff810f76b5>] create_object+0x1a2/0x2a9 [<ffffffff810f78bb>] kmemleak_alloc+0x26/0x4b [<ffffffff810ef3eb>] __kmalloc+0x18f/0x1b8 [<ffffffff811cd511>] security_get_bools+0xd7/0x16f [<ffffffff811c48c0>] sel_write_load+0x12e/0x62b [<ffffffff810f9a39>] vfs_write+0xae/0x10b [<ffffffff810f9b56>] sys_write+0x4a/0x6e [<ffffffff81011b82>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * syslog: use defined constants instead of raw numbersKees Cook2010-02-041-10/+11
| | | | | | | | | | | | | | | | | | | | | | Right now the syslog "type" action are just raw numbers which makes the source difficult to follow. This patch replaces the raw numbers with defined constants for some level of sanity. Signed-off-by: Kees Cook <kees.cook@canonical.com> Acked-by: John Johansen <john.johansen@canonical.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
| * syslog: distinguish between /proc/kmsg and syscallsKees Cook2010-02-041-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This allows the LSM to distinguish between syslog functions originating from /proc/kmsg access and direct syscalls. By default, the commoncaps will now no longer require CAP_SYS_ADMIN to read an opened /proc/kmsg file descriptor. For example the kernel syslog reader can now drop privileges after opening /proc/kmsg, instead of staying privileged with CAP_SYS_ADMIN. MAC systems that implement security_syslog have unchanged behavior. Signed-off-by: Kees Cook <kees.cook@canonical.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
| * selinux: allow MLS->non-MLS and vice versa upon policy reloadGuido Trentalancia2010-02-049-59/+84
| | | | | | | | | | | | | | | | | | Allow runtime switching between different policy types (e.g. from a MLS/MCS policy to a non-MLS/non-MCS policy or viceversa). Signed-off-by: Guido Trentalancia <guido@trentalancia.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * selinux: load the initial SIDs upon every policy loadGuido Trentalancia2010-02-041-4/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | Always load the initial SIDs, even in the case of a policy reload and not just at the initial policy load. This comes particularly handy after the introduction of a recent patch for enabling runtime switching between different policy types, although this patch is in theory independent from that feature. Signed-off-by: Guido Trentalancia <guido@trentalancia.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * selinux: Only audit permissions specified in policyStephen Smalley2010-02-031-10/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Only audit the permissions specified by the policy rules. Before: type=AVC msg=audit(01/28/2010 14:30:46.690:3250) : avc: denied { read append } for pid=14092 comm=foo name=test_file dev=dm-1 ino=132932 scontext=unconfined_u:unconfined_r:load_policy_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:rpm_tmp_t:s0 tclass=file After: type=AVC msg=audit(01/28/2010 14:52:37.448:26) : avc: denied { append } for pid=1917 comm=foo name=test_file dev=dm-1 ino=132932 scontext=unconfined_u:unconfined_r:load_policy_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:rpm_tmp_t:s0 tclass=file Reference: https://bugzilla.redhat.com/show_bug.cgi?id=558499 Reported-by: Tom London <selinux@gmail.com> Signed-off-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * selinux: remove dead code in type_attribute_bounds_av()KaiGai Kohei2010-01-251-39/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes dead code in type_attribute_bounds_av(). Due to the historical reason, the type boundary feature is delivered from hierarchical types in libsepol, it has supported boundary features both of subject type (domain; in most cases) and target type. However, we don't have any actual use cases in bounded target types, and it tended to make conceptual confusion. So, this patch removes the dead code to apply boundary checks on the target types. I makes clear the TYPEBOUNDS restricts privileges of a certain domain bounded to any other domain. Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> -- security/selinux/ss/services.c | 43 +++------------------------------------ 1 files changed, 4 insertions(+), 39 deletions(-) Signed-off-by: James Morris <jmorris@namei.org>
| * selinux: convert range transition list to a hashtabStephen Smalley2010-01-253-41/+86
| | | | | | | | | | | | | | | | | | | | | | | | Per https://bugzilla.redhat.com/show_bug.cgi?id=548145 there are sufficient range transition rules in modern (Fedora) policy to make mls_compute_sid a significant factor on the shmem file setup path due to the length of the range_tr list. Replace the simple range_tr list with a hashtab inside the security server to help mitigate this problem. Signed-off-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * Merge branch 'master' into nextJames Morris2010-01-183-3/+3
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| * | selinux: change the handling of unknown classesStephen Smalley2010-01-184-120/+88
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If allow_unknown==deny, SELinux treats an undefined kernel security class as an error condition rather than as a typical permission denial and thus does not allow permissions on undefined classes even when in permissive mode. Change the SELinux logic so that this case is handled as a typical permission denial, subject to the usual permissive mode and permissive domain handling. Also drop the 'requested' argument from security_compute_av() and helpers as it is a legacy of the original security server interface and is unused. Changes: - Handle permissive domains consistently by moving up the test for a permissive domain. - Make security_compute_av_user() consistent with security_compute_av(); the only difference now is that security_compute_av() performs mapping between the kernel-private class and permission indices and the policy values. In the userspace case, this mapping is handled by libselinux. - Moved avd_init inside the policy lock. Based in part on a patch by Paul Moore <paul.moore@hp.com>. Reported-by: Andrew Worsley <amworsley@gmail.com> Signed-off-by: Stephen D. Smalley <sds@tycho.nsa.gov> Reviewed-by: Paul Moore <paul.moore@hp.com> Signed-off-by: James Morris <jmorris@namei.org>
| * | Merge branch 'master' into nextJames Morris2009-12-091-3/+3
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| * | | selinux: remove a useless returnAmerigo Wang2009-12-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The last return is unreachable, remove the 'return' in default, let it fall through. Signed-off-by: WANG Cong <amwang@redhat.com> Acked-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * | | security/selinux/ss: correct size computationJulia Lawall2009-12-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The size argument to kcalloc should be the size of desired structure, not the pointer to it. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @expression@ expression *x; @@ x = <+... -sizeof(x) +sizeof(*x) ...+>// </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Acked-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* | | | netlabel: fix export of SELinux categories > 127Joshua Roys2010-02-251-1/+1
| |_|/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes corrupted CIPSO packets when SELinux categories greater than 127 are used. The bug occured on the second (and later) loops through the while; the inner for loop through the ebitmap->maps array used the same index as the NetLabel catmap->bitmap array, even though the NetLabel bitmap is twice as long as the SELinux bitmap. Signed-off-by: Joshua Roys <joshua.roys@gtri.gatech.edu> Acked-by: Paul Moore <paul.moore@hp.com> Signed-off-by: James Morris <jmorris@namei.org>
* | | SECURITY: selinux, fix update_rlimit_cpu parameterJiri Slaby2010-01-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't pass current RLIMIT_RTTIME to update_rlimit_cpu() in selinux_bprm_committing_creds, since update_rlimit_cpu expects RLIMIT_CPU limit. Use proper rlim[RLIMIT_CPU].rlim_cur instead to fix that. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Acked-by: James Morris <jmorris@namei.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: Eric Paris <eparis@parisplace.org> Cc: David Howells <dhowells@redhat.com>
* | | Merge branch 'for-linus' of ↵Linus Torvalds2009-12-092-2/+2
|\ \ \ | |_|/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (42 commits) tree-wide: fix misspelling of "definition" in comments reiserfs: fix misspelling of "journaled" doc: Fix a typo in slub.txt. inotify: remove superfluous return code check hdlc: spelling fix in find_pvc() comment doc: fix regulator docs cut-and-pasteism mtd: Fix comment in Kconfig doc: Fix IRQ chip docs tree-wide: fix assorted typos all over the place drivers/ata/libata-sff.c: comment spelling fixes fix typos/grammos in Documentation/edac.txt sysctl: add missing comments fs/debugfs/inode.c: fix comment typos sgivwfb: Make use of ARRAY_SIZE. sky2: fix sky2_link_down copy/paste comment error tree-wide: fix typos "couter" -> "counter" tree-wide: fix typos "offest" -> "offset" fix kerneldoc for set_irq_msi() spidev: fix double "of of" in comment comment typo fix: sybsystem -> subsystem ...
| * | Merge branch 'for-next' into for-linusJiri Kosina2009-12-072-2/+2
| |\ \ | | |/ | |/| | | | | | | | | | Conflicts: kernel/irq/chip.c
| | * tree-wide: fix assorted typos all over the placeAndré Goddard Rosa2009-12-042-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | That is "success", "unknown", "through", "performance", "[re|un]mapping" , "access", "default", "reasonable", "[con]currently", "temperature" , "channel", "[un]used", "application", "example","hierarchy", "therefore" , "[over|under]flow", "contiguous", "threshold", "enough" and others. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller2009-12-0519-1694/+545
|\| | | | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/pcmcia/fmvj18x_cs.c drivers/net/pcmcia/nmclan_cs.c drivers/net/pcmcia/xirc2ps_cs.c drivers/net/wireless/ray_cs.c
| * | SELinux: print denials for buggy kernel with unknown permsEric Paris2009-11-242-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Historically we've seen cases where permissions are requested for classes where they do not exist. In particular we have seen CIFS forget to set i_mode to indicate it is a directory so when we later check something like remove_name we have problems since it wasn't defined in tclass file. This used to result in a avc which included the permission 0x2000 or something. Currently the kernel will deny the operations (good thing) but will not print ANY information (bad thing). First the auditdeny field is no extended to include unknown permissions. After that is fixed the logic in avc_dump_query to output this information isn't right since it will remove the permission from the av and print the phrase "<NULL>". This takes us back to the behavior before the classmap rewrite. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * | security: report the module name to security_module_requestEric Paris2009-11-101-2/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For SELinux to do better filtering in userspace we send the name of the module along with the AVC denial when a program is denied module_request. Example output: type=SYSCALL msg=audit(11/03/2009 10:59:43.510:9) : arch=x86_64 syscall=write success=yes exit=2 a0=3 a1=7fc28c0d56c0 a2=2 a3=7fffca0d7440 items=0 ppid=1727 pid=1729 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rpc.nfsd exe=/usr/sbin/rpc.nfsd subj=system_u:system_r:nfsd_t:s0 key=(null) type=AVC msg=audit(11/03/2009 10:59:43.510:9) : avc: denied { module_request } for pid=1729 comm=rpc.nfsd kmod="net-pf-10" scontext=system_u:system_r:nfsd_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * | SELinux: add .gitignore files for dynamic classesEric Paris2009-10-241-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The SELinux dynamic class work in c6d3aaa4e35c71a32a86ececacd4eea7ecfc316c creates a number of dynamic header files and scripts. Add .gitignore files so git doesn't complain about these. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * | SELinux: fix locking issue introduced with c6d3aaa4e35c71a3Stephen Smalley2009-10-201-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | Ensure that we release the policy read lock on all exit paths from security_compute_av. Signed-off-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * | selinux: drop remapping of netlink classesStephen Smalley2009-10-072-30/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Drop remapping of netlink classes and bypass of permission checking based on netlink message type for policy version < 18. This removes compatibility code introduced when the original single netlink security class used for all netlink sockets was split into finer-grained netlink classes based on netlink protocol and when permission checking was added based on netlink message type in Linux 2.6.8. The only known distribution that shipped with SELinux and policy < 18 was Fedora Core 2, which was EOL'd on 2005-04-11. Given that the remapping code was never updated to address the addition of newer netlink classes, that the corresponding userland support was dropped in 2005, and that the assumptions made by the remapping code about the fixed ordering among netlink classes in the policy may be violated in the future due to the dynamic class/perm discovery support, we should drop this compatibility code now. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * | selinux: generate flask headers during kernel buildStephen Smalley2009-10-074-963/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a simple utility (scripts/selinux/genheaders) and invoke it to generate the kernel-private class and permission indices in flask.h and av_permissions.h automatically during the kernel build from the security class mapping definitions in classmap.h. Adding new kernel classes and permissions can then be done just by adding them to classmap.h. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * | selinux: dynamic class/perm discoveryStephen Smalley2009-10-0715-744/+555
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Modify SELinux to dynamically discover class and permission values upon policy load, based on the dynamic object class/perm discovery logic from libselinux. A mapping is created between kernel-private class and permission indices used outside the security server and the policy values used within the security server. The mappings are only applied upon kernel-internal computations; similar mappings for the private indices of userspace object managers is handled on a per-object manager basis by the userspace AVC. The interfaces for compute_av and transition_sid are split for kernel vs. userspace; the userspace functions are distinguished by a _user suffix. The kernel-private class indices are no longer tied to the policy values and thus do not need to skip indices for userspace classes; thus the kernel class index values are compressed. The flask.h definitions were regenerated by deleting the userspace classes from refpolicy's definitions and then regenerating the headers. Going forward, we can just maintain the flask.h, av_permissions.h, and classmap.h definitions separately from policy as they are no longer tied to the policy values. The next patch introduces a utility to automate generation of flask.h and av_permissions.h from the classmap.h definitions. The older kernel class and permission string tables are removed and replaced by a single security class mapping table that is walked at policy load to generate the mapping. The old kernel class validation logic is completely replaced by the mapping logic. The handle unknown logic is reworked. reject_unknown=1 is handled when the mappings are computed at policy load time, similar to the old handling by the class validation logic. allow_unknown=1 is handled when computing and mapping decisions - if the permission was not able to be mapped (i.e. undefined, mapped to zero), then it is automatically added to the allowed vector. If the class was not able to be mapped (i.e. undefined, mapped to zero), then all permissions are allowed for it if allow_unknown=1. avc_audit leverages the new security class mapping table to lookup the class and permission names from the kernel-private indices. The mdp program is updated to use the new table when generating the class definitions and allow rules for a minimal boot policy for the kernel. It should be noted that this policy will not include any userspace classes, nor will its policy index values for the kernel classes correspond with the ones in refpolicy (they will instead match the kernel-private indices). Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
| * | SELinux: reset the security_ops before flushing the avc cacheEric Paris2009-09-301-3/+3
| |/ | | | | | | | | | | | | | | | | | | | | | | | | This patch resets the security_ops to the secondary_ops before it flushes the avc. It's still possible that a task on another processor could have already passed the security_ops dereference and be executing an selinux hook function which would add a new avc entry. That entry would still not be freed. This should however help to reduce the number of needless avcs the kernel has when selinux is disabled at run time. There is no wasted memory if selinux is disabled on the command line or not compiled. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* / net: rename skb->iif to skb->skb_iifEric Dumazet2009-11-201-3/+3
|/ | | | | | | To help grep games, rename iif to skb_iif Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* do_wait() wakeup optimization: change __wake_up_parent() to use filtered wakeupOleg Nesterov2009-09-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | Ratan Nalumasu reported that in a process with many threads doing unnecessary wakeups. Every waiting thread in the process wakes up to loop through the children and see that the only ones it cares about are still not ready. Now that we have struct wait_opts we can change do_wait/__wake_up_parent to use filtered wakeups. We can make child_wait_callback() more clever later, right now it only checks eligible_child(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Roland McGrath <roland@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ratan Nalumasu <rnalumasu@gmail.com> Cc: Vitaly Mayatskikh <vmayatsk@redhat.com> Acked-by: James Morris <jmorris@namei.org> Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* SELinux: do not destroy the avc_cache_nodepEric Paris2009-09-231-4/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The security_ops reset done when SELinux is disabled at run time is done after the avc cache is freed and after the kmem_cache for the avc is also freed. This means that between the time the selinux disable code destroys the avc_node_cachep another process could make a security request and could try to allocate from the cache. We are just going to leave the cachep around, like we always have. SELinux: Disabled at runtime. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff81122537>] kmem_cache_alloc+0x9a/0x185 PGD 0 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC last sysfs file: CPU 1 Modules linked in: Pid: 12, comm: khelper Not tainted 2.6.31-tip-05525-g0eeacc6-dirty #14819 System Product Name RIP: 0010:[<ffffffff81122537>] [<ffffffff81122537>] kmem_cache_alloc+0x9a/0x185 RSP: 0018:ffff88003f9258b0 EFLAGS: 00010086 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000078c0129e RDX: 0000000000000000 RSI: ffffffff8130b626 RDI: ffffffff81122528 RBP: ffff88003f925900 R08: 0000000078c0129e R09: 0000000000000001 R10: 0000000000000000 R11: 0000000078c0129e R12: 0000000000000246 R13: 0000000000008020 R14: ffff88003f8586d8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff880002b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000000000000000 CR3: 0000000001001000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: ffffffff827bd420 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process khelper (pid: 12, threadinfo ffff88003f924000, task ffff88003f928000) Stack: 0000000000000246 0000802000000246 ffffffff8130b626 0000000000000001 <0> 0000000078c0129e 0000000000000000 ffff88003f925a70 0000000000000002 <0> 0000000000000001 0000000000000001 ffff88003f925960 ffffffff8130b626 Call Trace: [<ffffffff8130b626>] ? avc_alloc_node+0x36/0x273 [<ffffffff8130b626>] avc_alloc_node+0x36/0x273 [<ffffffff8130b545>] ? avc_latest_notif_update+0x7d/0x9e [<ffffffff8130b8b4>] avc_insert+0x51/0x18d [<ffffffff8130bcce>] avc_has_perm_noaudit+0x9d/0x128 [<ffffffff8130bf20>] avc_has_perm+0x45/0x88 [<ffffffff8130f99d>] current_has_perm+0x52/0x6d [<ffffffff8130fbb2>] selinux_task_create+0x2f/0x45 [<ffffffff81303bf7>] security_task_create+0x29/0x3f [<ffffffff8105c6ba>] copy_process+0x82/0xdf0 [<ffffffff81091578>] ? register_lock_class+0x2f/0x36c [<ffffffff81091a13>] ? mark_lock+0x2e/0x1e1 [<ffffffff8105d596>] do_fork+0x16e/0x382 [<ffffffff81091578>] ? register_lock_class+0x2f/0x36c [<ffffffff810d9166>] ? probe_workqueue_execution+0x57/0xf9 [<ffffffff81091a13>] ? mark_lock+0x2e/0x1e1 [<ffffffff810d9166>] ? probe_workqueue_execution+0x57/0xf9 [<ffffffff8100cdb2>] kernel_thread+0x82/0xe0 [<ffffffff81078b1f>] ? ____call_usermodehelper+0x0/0x139 [<ffffffff8100ce10>] ? child_rip+0x0/0x20 [<ffffffff81078aea>] ? __call_usermodehelper+0x65/0x9a [<ffffffff8107a5c7>] run_workqueue+0x171/0x27e [<ffffffff8107a573>] ? run_workqueue+0x11d/0x27e [<ffffffff81078a85>] ? __call_usermodehelper+0x0/0x9a [<ffffffff8107a7bc>] worker_thread+0xe8/0x10f [<ffffffff810808e2>] ? autoremove_wake_function+0x0/0x63 [<ffffffff8107a6d4>] ? worker_thread+0x0/0x10f [<ffffffff8108042e>] kthread+0x91/0x99 [<ffffffff8100ce1a>] child_rip+0xa/0x20 [<ffffffff8100c754>] ? restore_args+0x0/0x30 [<ffffffff8108039d>] ? kthread+0x0/0x99 [<ffffffff8100ce10>] ? child_rip+0x0/0x20 Code: 0f 85 99 00 00 00 9c 58 66 66 90 66 90 49 89 c4 fa 66 66 90 66 66 90 e8 83 34 fb ff e8 d7 e9 26 00 48 98 49 8b 94 c6 10 01 00 00 <48> 8b 1a 44 8b 7a 18 48 85 db 74 0f 8b 42 14 48 8b 04 c3 ff 42 RIP [<ffffffff81122537>] kmem_cache_alloc+0x9a/0x185 RSP <ffff88003f9258b0> CR2: 0000000000000000 ---[ end trace 42f41a982344e606 ]--- Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* SELinux: flush the avc before disabling SELinuxEric Paris2009-09-141-0/+2
| | | | | | | | Before SELinux is disabled at boot it can create AVC entries. This patch will flush those entries before disabling SELinux. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* SELinux: seperate avc_cache flushingEric Paris2009-09-141-7/+17
| | | | | | | | Move the avc_cache flushing into it's own function so it can be reused when disabling SELinux. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* Creds: creds->security can be NULL is selinux is disabledEric Paris2009-09-141-0/+6
| | | | | | | | __validate_process_creds should check if selinux is actually enabled before running tests on the selinux portion of the credentials struct. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* sysfs: Add labeling support for sysfsDavid P. Quigley2009-09-101-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a setxattr handler to the file, directory, and symlink inode_operations structures for sysfs. The patch uses hooks introduced in the previous patch to handle the getting and setting of security information for the sysfs inodes. As was suggested by Eric Biederman the struct iattr in the sysfs_dirent structure has been replaced by a structure which contains the iattr, secdata and secdata length to allow the changes to persist in the event that the inode representing the sysfs_dirent is evicted. Because sysfs only stores this information when a change is made all the optional data is moved into one dynamically allocated field. This patch addresses an issue where SELinux was denying virtd access to the PCI configuration entries in sysfs. The lack of setxattr handlers for sysfs required that a single label be assigned to all entries in sysfs. Granting virtd access to every entry in sysfs is not an acceptable solution so fine grained labeling of sysfs is required such that individual entries can be labeled appropriately. [sds: Fixed compile-time warnings, coding style, and setting of inode security init flags.] Signed-off-by: David P. Quigley <dpquigl@tycho.nsa.gov> Signed-off-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
* LSM/SELinux: inode_{get,set,notify}secctx hooks to access LSM security ↵David P. Quigley2009-09-101-0/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | context information. This patch introduces three new hooks. The inode_getsecctx hook is used to get all relevant information from an LSM about an inode. The inode_setsecctx is used to set both the in-core and on-disk state for the inode based on a context derived from inode_getsecctx.The final hook inode_notifysecctx will notify the LSM of a change for the in-core state of the inode in question. These hooks are for use in the labeled NFS code and addresses concerns of how to set security on an inode in a multi-xattr LSM. For historical reasons Stephen Smalley's explanation of the reason for these hooks is pasted below. Quote Stephen Smalley inode_setsecctx: Change the security context of an inode. Updates the in core security context managed by the security module and invokes the fs code as needed (via __vfs_setxattr_noperm) to update any backing xattrs that represent the context. Example usage: NFS server invokes this hook to change the security context in its incore inode and on the backing file system to a value provided by the client on a SETATTR operation. inode_notifysecctx: Notify the security module of what the security context of an inode should be. Initializes the incore security context managed by the security module for this inode. Example usage: NFS client invokes this hook to initialize the security context in its incore inode to the value provided by the server for the file when the server returned the file's attributes to the client. Signed-off-by: David P. Quigley <dpquigl@tycho.nsa.gov> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
* KEYS: Add a keyctl to install a process's session keyring on its parent [try #6]David Howells2009-09-021-0/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a keyctl to install a process's session keyring onto its parent. This replaces the parent's session keyring. Because the COW credential code does not permit one process to change another process's credentials directly, the change is deferred until userspace next starts executing again. Normally this will be after a wait*() syscall. To support this, three new security hooks have been provided: cred_alloc_blank() to allocate unset security creds, cred_transfer() to fill in the blank security creds and key_session_to_parent() - which asks the LSM if the process may replace its parent's session keyring. The replacement may only happen if the process has the same ownership details as its parent, and the process has LINK permission on the session keyring, and the session keyring is owned by the process, and the LSM permits it. Note that this requires alteration to each architecture's notify_resume path. This has been done for all arches barring blackfin, m68k* and xtensa, all of which need assembly alteration to support TIF_NOTIFY_RESUME. This allows the replacement to be performed at the point the parent process resumes userspace execution. This allows the userspace AFS pioctl emulation to fully emulate newpag() and the VIOCSETTOK and VIOCSETTOK2 pioctls, all of which require the ability to alter the parent process's PAG membership. However, since kAFS doesn't use PAGs per se, but rather dumps the keys into the session keyring, the session keyring of the parent must be replaced if, for example, VIOCSETTOK is passed the newpag flag. This can be tested with the following program: #include <stdio.h> #include <stdlib.h> #include <keyutils.h> #define KEYCTL_SESSION_TO_PARENT 18 #define OSERROR(X, S) do { if ((long)(X) == -1) { perror(S); exit(1); } } while(0) int main(int argc, char **argv) { key_serial_t keyring, key; long ret; keyring = keyctl_join_session_keyring(argv[1]); OSERROR(keyring, "keyctl_join_session_keyring"); key = add_key("user", "a", "b", 1, keyring); OSERROR(key, "add_key"); ret = keyctl(KEYCTL_SESSION_TO_PARENT); OSERROR(ret, "KEYCTL_SESSION_TO_PARENT"); return 0; } Compiled and linked with -lkeyutils, you should see something like: [dhowells@andromeda ~]$ keyctl show Session Keyring -3 --alswrv 4043 4043 keyring: _ses 355907932 --alswrv 4043 -1 \_ keyring: _uid.4043 [dhowells@andromeda ~]$ /tmp/newpag [dhowells@andromeda ~]$ keyctl show Session Keyring -3 --alswrv 4043 4043 keyring: _ses 1055658746 --alswrv 4043 4043 \_ user: a [dhowells@andromeda ~]$ /tmp/newpag hello [dhowells@andromeda ~]$ keyctl show Session Keyring -3 --alswrv 4043 4043 keyring: hello 340417692 --alswrv 4043 4043 \_ user: a Where the test program creates a new session keyring, sticks a user key named 'a' into it and then installs it on its parent. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* CRED: Add some configurable debugging [try #6]David Howells2009-09-021-1/+5
| | | | | | | | | | | | | | | | | | | | Add a config option (CONFIG_DEBUG_CREDENTIALS) to turn on some debug checking for credential management. The additional code keeps track of the number of pointers from task_structs to any given cred struct, and checks to see that this number never exceeds the usage count of the cred struct (which includes all references, not just those from task_structs). Furthermore, if SELinux is enabled, the code also checks that the security pointer in the cred struct is never seen to be invalid. This attempts to catch the bug whereby inode_has_perm() faults in an nfsd kernel thread on seeing cred->security be a NULL pointer (it appears that the credential struct has been previously released): http://www.kerneloops.org/oops.php?number=252883 Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
* selinux: Support for the new TUN LSM hooksPaul Moore2009-09-015-2/+83
| | | | | | | | | | | | | | | | Add support for the new TUN LSM hooks: security_tun_dev_create(), security_tun_dev_post_create() and security_tun_dev_attach(). This includes the addition of a new object class, tun_socket, which represents the socks associated with TUN devices. The _tun_dev_create() and _tun_dev_post_create() hooks are fairly similar to the standard socket functions but _tun_dev_attach() is a bit special. The _tun_dev_attach() is unique because it involves a domain attaching to an existing TUN device and its associated tun_socket object, an operation which does not exist with standard sockets and most closely resembles a relabel operation. Signed-off-by: Paul Moore <paul.moore@hp.com> Acked-by: Eric Paris <eparis@parisplace.org> Signed-off-by: James Morris <jmorris@namei.org>
* selinux: adjust rules for ATTR_FORCEAmerigo Wang2009-08-211-5/+11
| | | | | | | | | | | | | | | | | | | As suggested by OGAWA Hirofumi in thread: http://lkml.org/lkml/2009/8/7/132, we should let selinux_inode_setattr() to match our ATTR_* rules. ATTR_FORCE should not force things like ATTR_SIZE. [hirofumi@mail.parknet.co.jp: tweaks] Signed-off-by: WANG Cong <amwang@redhat.com> Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Eric Paris <eparis@redhat.com> Cc: Eugene Teo <eteo@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Acked-by: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: James Morris <jmorris@namei.org>
* Merge branch 'master' into nextJames Morris2009-08-201-1/+2
|\ | | | | | | | | | | | | | | | | Conflicts: security/Kconfig Manual fix. Signed-off-by: James Morris <jmorris@namei.org>
| * Security/SELinux: seperate lsm specific mmap_min_addrEric Paris2009-08-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently SELinux enforcement of controls on the ability to map low memory is determined by the mmap_min_addr tunable. This patch causes SELinux to ignore the tunable and instead use a seperate Kconfig option specific to how much space the LSM should protect. The tunable will now only control the need for CAP_SYS_RAWIO and SELinux permissions will always protect the amount of low memory designated by CONFIG_LSM_MMAP_MIN_ADDR. This allows users who need to disable the mmap_min_addr controls (usual reason being they run WINE as a non-root user) to do so and still have SELinux controls preventing confined domains (like a web server) from being able to map some area of low memory. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * SELinux: call cap_file_mmap in selinux_file_mmapEric Paris2009-08-171-1/+13
| | | | | | | | | | | | | | | | | | | | | | | | Currently SELinux does not check CAP_SYS_RAWIO in the file_mmap hook. This means there is no DAC check on the ability to mmap low addresses in the memory space. This function adds the DAC check for CAP_SYS_RAWIO while maintaining the selinux check on mmap_zero. This means that processes which need to mmap low memory will need CAP_SYS_RAWIO and mmap_zero but will NOT need the SELinux sys_rawio capability. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
| * SELinux: fix memory leakage in /security/selinux/hooks.cJames Morris2009-08-111-1/+2
| | | | | | | | | | | | | | | | | | | | | | Fix memory leakage in /security/selinux/hooks.c The buffer always needs to be freed here; we either error out or allocate more memory. Reported-by: iceberg <strakh@ispras.ru> Signed-off-by: James Morris <jmorris@namei.org> Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
* | SELinux: Convert avc_audit to use lsm_audit.hThomas Liu2009-08-177-280/+126
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert avc_audit in security/selinux/avc.c to use lsm_audit.h, for better maintainability. - changed selinux to use common_audit_data instead of avc_audit_data - eliminated code in avc.c and used code from lsm_audit.h instead. Had to add a LSM_AUDIT_NO_AUDIT to lsm_audit.h so that avc_audit can call common_lsm_audit and do the pre and post callbacks without doing the actual dump. This makes it so that the patched version behaves the same way as the unpatched version. Also added a denied field to the selinux_audit_data private space, once again to make it so that the patched version behaves like the unpatched. I've tested and confirmed that AVCs look the same before and after this patch. Signed-off-by: Thomas Liu <tliu@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
* | SELinux: add selinux_kernel_module_requestEric Paris2009-08-143-0/+8
| | | | | | | | | | | | | | | | | | | | | | This patch adds a new selinux hook so SELinux can arbitrate if a given process should be allowed to trigger a request for the kernel to try to load a module. This is a different operation than a process trying to load a module itself, which is already protected by CAP_SYS_MODULE. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
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