Commit Graph

605 Commits

Author SHA1 Message Date
Eric Paris
a200005038 SELinux: return error codes on policy load failure
policy load failure always return EINVAL even if the failure was for some
other reason (usually ENOMEM).  This patch passes error codes back up the
stack where they will make their way to userspace.  This might help in
debugging future problems with policy load.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
2010-04-21 08:58:49 +10:00
wzt.wzt@gmail.com
c1a7368a6f Security: Fix coding style in security/
Fix coding style in security/

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-04-09 15:13:48 +10:00
Eric Paris
dd3e7836bf selinux: always call sk_security_struct sksec
trying to grep everything that messes with a sk_security_struct isn't easy
since we don't always call it sksec.  Just rename everything sksec.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-04-08 09:17:02 +10:00
James Morris
d25d6fa1a9 Merge branch 'master' into next 2010-03-31 08:39:27 +11:00
Stephen Smalley
77c160e779 SELinux: Reduce max avtab size to avoid page allocation failures
Reduce MAX_AVTAB_HASH_BITS so that the avtab allocation is an order 2
allocation rather than an order 4 allocation on x86_64.  This
addresses reports of page allocation failures:
http://marc.info/?l=selinux&m=126757230625867&w=2
https://bugzilla.redhat.com/show_bug.cgi?id=570433

Reported-by:  Russell Coker <russell@coker.com.au>
Signed-off-by:  Stephen D. Smalley <sds@tycho.nsa.gov>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-03-16 08:31:02 +11:00
James Morris
c43a752347 Merge branch 'next-queue' into next 2010-03-09 12:46:47 +11:00
Jiri Kosina
318ae2edc3 Merge branch 'for-next' into for-linus
Conflicts:
	Documentation/filesystems/proc.txt
	arch/arm/mach-u300/include/mach/debug-macro.S
	drivers/net/qlge/qlge_ethtool.c
	drivers/net/qlge/qlge_main.c
	drivers/net/typhoon.c
2010-03-08 16:55:37 +01:00
Stephen Hemminger
634a539e16 selinux: const strings in tables
Several places strings tables are used that should be declared
const.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-03-08 09:33:53 +11:00
wzt.wzt@gmail.com
06b9b72df4 Selinux: Remove unused headers skbuff.h in selinux/nlmsgtab.c
skbuff.h is already included by netlink.h, so remove it.

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-03-04 08:51:06 +11:00
wzt.wzt@gmail.com
dbba541f9d Selinux: Remove unused headers slab.h in selinux/ss/symtab.c
slab.h is unused in symtab.c, so remove it.

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-03-03 09:22:16 +11:00
wzt.wzt@gmail.com
31637b55b0 Selinux: Remove unused headers list.h in selinux/netlink.c
list.h is unused in netlink.c, so remove it.

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-03-03 09:20:57 +11:00
James Morris
b4ccebdd37 Merge branch 'next' into for-linus 2010-03-01 09:36:31 +11:00
David Howells
ef57471a73 SELinux: Make selinux_kernel_create_files_as() shouldn't just always return 0
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>
2010-02-26 14:54:23 +11:00
Joshua Roys
c36f74e67f netlabel: fix export of SELinux categories > 127
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>
2010-02-25 17:49:20 +11:00
wzt.wzt@gmail.com
189b3b1c89 Security: add static to security_ops and default_security_ops variable
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>
2010-02-24 08:11:02 +11:00
KaiGai Kohei
2ae3ba3938 selinux: libsepol: remove dead code in check_avtab_hierarchy_callback()
This patch revert the commit of 7d52a155e3
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>
2010-02-22 08:27:41 +11:00
James Morris
2da5d31bc7 security: fix a couple of sparse warnings
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>
2010-02-16 17:29:06 +11:00
Xiaotian Feng
8007f10259 selinux: fix memory leak in sel_make_bools
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>
2010-02-09 08:22:24 +11:00
Justin P. Mattock
6382dc3340 fix comment typos in avc.c
Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-02-05 12:22:35 +01:00
Kees Cook
d78ca3cd73 syslog: use defined constants instead of raw numbers
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>
2010-02-04 14:20:41 +11:00
Kees Cook
002345925e syslog: distinguish between /proc/kmsg and syscalls
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>
2010-02-04 14:20:12 +11:00
Guido Trentalancia
0719aaf5ea selinux: allow MLS->non-MLS and vice versa upon policy reload
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>
2010-02-04 09:06:36 +11:00
Guido Trentalancia
42596eafdd selinux: load the initial SIDs upon every policy load
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>
2010-02-04 08:48:17 +11:00
Stephen Smalley
b6cac5a30b selinux: Only audit permissions specified in policy
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>
2010-02-03 08:49:10 +11:00
KaiGai Kohei
7d52a155e3 selinux: remove dead code in type_attribute_bounds_av()
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>
2010-01-25 08:31:38 +11:00
Stephen Smalley
2f3e82d694 selinux: convert range transition list to a hashtab
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>
2010-01-25 08:29:05 +11:00
James Morris
2457552d1e Merge branch 'master' into next 2010-01-18 09:56:22 +11:00
Stephen Smalley
19439d05b8 selinux: change the handling of unknown classes
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>
2010-01-18 09:54:26 +11:00
Jiri Slaby
17740d8978 SECURITY: selinux, fix update_rlimit_cpu parameter
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>
2010-01-04 11:27:18 +01:00
Linus Torvalds
4ef58d4e2a Merge branch 'for-linus' of 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
  ...
2009-12-09 19:43:33 -08:00
James Morris
1ad1f10cd9 Merge branch 'master' into next 2009-12-09 19:01:03 +11:00
Amerigo Wang
08e3daff21 selinux: remove a useless return
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>
2009-12-08 14:58:11 +11:00
Julia Lawall
9f59f90bf5 security/selinux/ss: correct size computation
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>
2009-12-08 14:57:54 +11:00
Jiri Kosina
d014d04386 Merge branch 'for-next' into for-linus
Conflicts:

	kernel/irq/chip.c
2009-12-07 18:36:35 +01:00
David S. Miller
28b4d5cc17 Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
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
2009-12-05 15:22:26 -08:00
André Goddard Rosa
af901ca181 tree-wide: fix assorted typos all over the place
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>
2009-12-04 15:39:55 +01:00
Eric Paris
0bce952799 SELinux: print denials for buggy kernel with unknown perms
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>
2009-11-24 14:30:49 +11:00
Eric Dumazet
8964be4a9a net: rename skb->iif to skb->skb_iif
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>
2009-11-20 15:35:04 -08:00
Eric Paris
dd8dbf2e68 security: report the module name to security_module_request
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>
2009-11-10 09:33:46 +11:00
Eric Paris
6e8e16c7bc SELinux: add .gitignore files for dynamic classes
The SELinux dynamic class work in c6d3aaa4e3
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>
2009-10-24 09:42:27 +08:00
Stephen Smalley
b7f3008ad1 SELinux: fix locking issue introduced with c6d3aaa4e3
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>
2009-10-20 09:22:07 +09:00
Stephen Smalley
941fc5b2bf selinux: drop remapping of netlink classes
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>
2009-10-07 21:56:46 +11:00
Stephen Smalley
8753f6bec3 selinux: generate flask headers during kernel build
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>
2009-10-07 21:56:44 +11:00
Stephen Smalley
c6d3aaa4e3 selinux: dynamic class/perm discovery
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>
2009-10-07 21:56:42 +11:00
Eric Paris
af8ff04917 SELinux: reset the security_ops before flushing the avc cache
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>
2009-09-30 19:17:06 +10:00
Oleg Nesterov
0b7570e77f do_wait() wakeup optimization: change __wake_up_parent() to use filtered wakeup
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>
2009-09-24 07:20:59 -07:00
Eric Paris
5224ee0863 SELinux: do not destroy the avc_cache_nodep
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>
2009-09-23 11:16:20 -07:00
Eric Paris
4e6d0bffd3 SELinux: flush the avc before disabling SELinux
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>
2009-09-14 12:34:11 +10:00
Eric Paris
008574b111 SELinux: seperate avc_cache flushing
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>
2009-09-14 12:34:09 +10:00
Eric Paris
ed868a5698 Creds: creds->security can be NULL is selinux is disabled
__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>
2009-09-14 12:34:07 +10:00