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selinux: export validatetrans decisions

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Make validatetrans decisions available through selinuxfs.
"/validatetrans" is added to selinuxfs for this purpose.
This functionality is needed by file system servers
implemented in userspace or kernelspace without the VFS
layer.

Writing "$oldcontext $newcontext $tclass $taskcontext"
to /validatetrans is expected to return 0 if the transition
is allowed and -EPERM otherwise.

Signed-off-by: Andrew Perepechko <anserper@ya.ru>
CC: andrew.perepechko@seagate.com
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Andrew Perepechko 2015-12-24 11:09:41 -05:00 • committed by Paul Moore
parent f39814f60a
commit f9df645821
4 changed files with 111 additions and 8 deletions
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3
security/selinux/include/security.h
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@ -187,6 +187,9 @@ int security_node_sid(u16 domain, void *addr, u32 addrlen,
int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
u16 tclass);
int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
u16 tclass);
int security_bounded_transition(u32 oldsid, u32 newsid);
int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);