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[PATCH] selinux: enable configuration of max policy version

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Enable configuration of SELinux maximum supported policy version to support
legacy userland (init) that does not gracefully handle kernels that support
newer policy versions two or more beyond the installed policy, as in FC3
and FC4.

[bunk@stusta.de: improve Kconfig help text]
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stephen Smalley 2006-09-25 23:31:58 -07:00 committed by Linus Torvalds
parent 9a2f44f01a
commit 016b9bdb81
2 changed files with 42 additions and 1 deletions
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37
security/selinux/Kconfig
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@ -124,3 +124,40 @@ config SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
If you are unsure what do do here, select N.
config SECURITY_SELINUX_POLICYDB_VERSION_MAX
bool "NSA SELinux maximum supported policy format version"
depends on SECURITY_SELINUX
default n
help
This option enables the maximum policy format version supported
by SELinux to be set to a particular value. This value is reported
to userspace via /selinux/policyvers and used at policy load time.
It can be adjusted downward to support legacy userland (init) that
does not correctly handle kernels that support newer policy versions.
Examples:
For the Fedora Core 3 or 4 Linux distributions, enable this option
and set the value via the next option. For Fedore Core 5 and later,
do not enable this option.
If you are unsure how to answer this question, answer N.
config SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
int "NSA SELinux maximum supported policy format version value"
depends on SECURITY_SELINUX_POLICYDB_VERSION_MAX
range 15 20
default 19
help
This option sets the value for the maximum policy format version
supported by SELinux.
Examples:
For Fedora Core 3, use 18.
For Fedora Core 4, use 19.
If you are unsure how to answer this question, look for the
policy format version supported by your policy toolchain, by
running 'checkpolicy -V'. Or look at what policy you have
installed under /etc/selinux/$SELINUXTYPE/policy, where
SELINUXTYPE is defined in your /etc/selinux/config.

6
security/selinux/include/security.h
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@ -27,7 +27,11 @@
/* Range of policy versions we understand*/
#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_AVTAB
#ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
#define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
#else
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_AVTAB
#endif
extern int selinux_enabled;
extern int selinux_mls_enabled;