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| author | Joshua Brindle <joshua.brindle@crunchydata.com> | 2019-09-05 00:03:23 +0300 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2019-10-08 02:01:35 +0300 |
| commit | 42345b68c2e3e2b6549fc34b937ff44240dfc3b6 (patch) | |
| tree | 8a12d11993f408f24d60ec5615258fe5f0bd94a3 /security/selinux/ss/mls.c | |
| parent | 3e3e24b42043eceb97ed834102c2d094dfd7aaa6 (diff) | |
| download | linux-42345b68c2e3e2b6549fc34b937ff44240dfc3b6.tar.xz | |
selinux: default_range glblub implementation
A policy developer can now specify glblub as a default_range default and
the computed transition will be the intersection of the mls range of
the two contexts.
The glb (greatest lower bound) lub (lowest upper bound) of a range is calculated
as the greater of the low sensitivities and the lower of the high sensitivities
and the and of each category bitmap.
This can be used by MLS solution developers to compute a context that satisfies,
for example, the range of a network interface and the range of a user logging in.
Some examples are:
User Permitted Range | Network Device Label | Computed Label
---------------------|----------------------|----------------
s0-s1:c0.c12 | s0 | s0
s0-s1:c0.c12 | s0-s1:c0.c1023 | s0-s1:c0.c12
s0-s4:c0.c512 | s1-s1:c0.c1023 | s1-s1:c0.c512
s0-s15:c0,c2 | s4-s6:c0.c128 | s4-s6:c0,c2
s0-s4 | s2-s6 | s2-s4
s0-s4 | s5-s8 | INVALID
s5-s8 | s0-s4 | INVALID
Signed-off-by: Joshua Brindle <joshua.brindle@crunchydata.com>
[PM: subject lines and checkpatch.pl fixes]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/selinux/ss/mls.c')
| -rw-r--r-- | security/selinux/ss/mls.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c index 5e05f5b902d7..ec5e3d1da9ac 100644 --- a/security/selinux/ss/mls.c +++ b/security/selinux/ss/mls.c @@ -529,6 +529,9 @@ int mls_compute_sid(struct policydb *p, return mls_context_cpy_high(newcontext, tcontext); case DEFAULT_TARGET_LOW_HIGH: return mls_context_cpy(newcontext, tcontext); + case DEFAULT_GLBLUB: + return mls_context_glblub(newcontext, + scontext, tcontext); } /* Fallthrough */ |