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p2p: allow NetPermissions::ClearFlag() only with PF_ISIMPLICIT

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NetPermissions::ClearFlag() is currently only called in the codebase with
an `f` value of NetPermissionFlags::PF_ISIMPLICIT.

If that should change in the future, ClearFlag() should not be called
with `f` being a subflag of a multiflag, e.g. NetPermissionFlags::PF_RELAY
or NetPermissionFlags::PF_DOWNLOAD, as that would leave `flags` in an
invalid state corresponding to none of the existing NetPermissionFlags.

Therefore, allow only calling ClearFlag with the implicit flag for now.

Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
This commit is contained in:
Jon Atack
2021-04-14 17:10:28 +02:00
parent 4e0d5788ba
commit 36fb036d25
2 changed files with 8 additions and 2 deletions
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6
src/net_permissions.h
View File

@ -51,8 +51,14 @@ public:
{
flags = static_cast<NetPermissionFlags>(flags | f);
}
//! ClearFlag is only called with `f` == NetPermissionFlags::PF_ISIMPLICIT.
//! If that should change in the future, be aware that ClearFlag should not
//! be called with a subflag of a multiflag, e.g. NetPermissionFlags::PF_RELAY
//! or NetPermissionFlags::PF_DOWNLOAD, as that would leave `flags` in an
//! invalid state corresponding to none of the existing flags.
static inline void ClearFlag(NetPermissionFlags& flags, NetPermissionFlags f)
{
assert(f == NetPermissionFlags::PF_ISIMPLICIT);
flags = static_cast<NetPermissionFlags>(flags & ~f);
}
};

4
src/test/fuzz/net_permissions.cpp
View File

@ -25,7 +25,7 @@ FUZZ_TARGET(net_permissions)
(void)NetPermissions::ToStrings(net_whitebind_permissions.m_flags);
(void)NetPermissions::AddFlag(net_whitebind_permissions.m_flags, net_permission_flags);
assert(NetPermissions::HasFlag(net_whitebind_permissions.m_flags, net_permission_flags));
(void)NetPermissions::ClearFlag(net_whitebind_permissions.m_flags, net_permission_flags);
(void)NetPermissions::ClearFlag(net_whitebind_permissions.m_flags, NetPermissionFlags::PF_ISIMPLICIT);
(void)NetPermissions::ToStrings(net_whitebind_permissions.m_flags);
}
@ -35,7 +35,7 @@ FUZZ_TARGET(net_permissions)
(void)NetPermissions::ToStrings(net_whitelist_permissions.m_flags);
(void)NetPermissions::AddFlag(net_whitelist_permissions.m_flags, net_permission_flags);
assert(NetPermissions::HasFlag(net_whitelist_permissions.m_flags, net_permission_flags));
(void)NetPermissions::ClearFlag(net_whitelist_permissions.m_flags, net_permission_flags);
(void)NetPermissions::ClearFlag(net_whitelist_permissions.m_flags, NetPermissionFlags::PF_ISIMPLICIT);
(void)NetPermissions::ToStrings(net_whitelist_permissions.m_flags);
}
}