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selinux: simplify avtab slot calculation

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Instead of dividing by 8 and then performing log2 by hand, use a more
readable calculation.

The behavior of rounddown_pow_of_two() for an input of 0 is undefined,
so handle that case and small values manually to achieve the same
results.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Christian Göttsche 2023-08-18 17:12:15 +02:00 committed by Paul Moore
parent 6f594f5a3d
commit 7969ba5776
1 changed files with 1 additions and 7 deletions
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8
security/selinux/ss/avtab.c
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@ -298,13 +298,7 @@ int avtab_alloc(struct avtab *h, u32 nrules)
u32 nslot = 0;
if (nrules != 0) {
u32 shift = 1;
u32 work = nrules >> 3;
while (work) {
work >>= 1;
shift++;
}
nslot = 1 << shift;
nslot = nrules > 3 ? rounddown_pow_of_two(nrules / 2) : 2;
if (nslot > MAX_AVTAB_HASH_BUCKETS)
nslot = MAX_AVTAB_HASH_BUCKETS;