By associative and commutative laws, the result of the two 'audited' is
zero. Take the second 'audited' as an example:
1) audited = requested & avd->auditallow;
2) audited &= ~requested;
==> audited = ~requested & (requested & avd->auditallow);
==> audited = (~requested & requested) & avd->auditallow;
==> audited = 0 & avd->auditallow;
==> audited = 0;
In fact, it is more readable to directly write zero. The value of the
first 'audited' is 0 because AUDIT is not allowed. The second 'audited'
is zero because there is no AUDITALLOW permission.
Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
---
security/selinux/avc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index b49c44869dc4627..21f5bbba50caaeb 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -396,7 +396,7 @@ static inline u32 avc_xperms_audit_required(u32 requested,
audited = denied & avd->auditdeny;
if (audited && xpd) {
if (avc_xperms_has_perm(xpd, perm, XPERMS_DONTAUDIT))
- audited &= ~requested;
+ audited = 0;
}
} else if (result) {
audited = denied = requested;
@@ -404,7 +404,7 @@ static inline u32 avc_xperms_audit_required(u32 requested,
audited = requested & avd->auditallow;
if (audited && xpd) {
if (!avc_xperms_has_perm(xpd, perm, XPERMS_AUDITALLOW))
- audited &= ~requested;
+ audited = 0;
}
}
--
2.34.1
