linux/security
Linus Torvalds 95f4efb2d7 selinux: simplify and clean up inode_has_perm()
This is a rather hot function that is called with a potentially NULL
"struct common_audit_data" pointer argument.  And in that case it has to
provide and initialize its own dummy common_audit_data structure.

However, all the _common_ cases already pass it a real audit-data
structure, so that uncommon NULL case not only creates a silly run-time
test, more importantly it causes that function to have a big stack frame
for the dummy variable that isn't even used in the common case!

So get rid of that stupid run-time behavior, and make the (few)
functions that currently call with a NULL pointer just call a new helper
function instead (naturally called inode_has_perm_noapd(), since it has
no adp argument).

This makes the run-time test be a static code generation issue instead,
and allows for a much denser stack since none of the common callers need
the dummy structure.  And a denser stack not only means less stack space
usage, it means better cache behavior.  So we have a win-win-win from
this simplification: less code executed, smaller stack footprint, and
better cache behavior.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-06-08 15:11:56 -07:00
..
apparmor AppArmor: fix oops in apparmor_setprocattr 2011-06-01 13:07:03 +10:00
integrity/ima ima: remove unnecessary call to ima_must_measure 2011-02-23 16:38:52 -05:00
keys Merge branch 'docs-move' of git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs 2011-05-27 10:25:02 -07:00
selinux selinux: simplify and clean up inode_has_perm() 2011-06-08 15:11:56 -07:00
smack Merge branch 'master' of git://git.infradead.org/users/eparis/selinux into for-linus 2011-05-24 23:20:19 +10:00
tomoyo TOMOYO: Fix wrong domainname validation. 2011-05-12 11:07:21 +10:00
capability.c SECURITY: Move exec_permission RCU checks into security modules 2011-04-25 10:20:32 -04:00
commoncap.c capabilities: do not special case exec of init 2011-04-04 10:31:06 +10:00
device_cgroup.c cgroups: add per-thread subsystem callbacks 2011-05-26 17:12:34 -07:00
inode.c convert get_sb_single() users 2010-10-29 04:16:28 -04:00
Kconfig security: select correct default LSM_MMAP_MIN_ADDR on ARM. 2011-03-22 09:35:12 +11:00
lsm_audit.c LSM: separate LSM_AUDIT_DATA_DENTRY from LSM_AUDIT_DATA_PATH 2011-04-25 18:14:07 -04:00
Makefile AppArmor: Enable configuring and building of the AppArmor security module 2010-08-02 15:38:34 +10:00
min_addr.c mmap_min_addr check CAP_SYS_RAWIO only for write 2010-04-23 08:56:31 +10:00
security.c SECURITY: Move exec_permission RCU checks into security modules 2011-04-25 10:20:32 -04:00