5.4-stable review patch. If anyone has any objections, please let me know.
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From: Mickaël Salaün mic@digikod.net
[ Upstream commit bbf5a1d0e5d0fb3bdf90205aa872636122692a50 ]
The IPv6 network stack first checks the sockaddr length (-EINVAL error) before checking the family (-EAFNOSUPPORT error).
This was discovered thanks to commit a549d055a22e ("selftests/landlock: Add network tests").
Cc: Eric Paris eparis@parisplace.org Cc: Konstantin Meskhidze konstantin.meskhidze@huawei.com Cc: Paul Moore paul@paul-moore.com Cc: Stephen Smalley stephen.smalley.work@gmail.com Reported-by: Muhammad Usama Anjum usama.anjum@collabora.com Closes: https://lore.kernel.org/r/0584f91c-537c-4188-9e4f-04f192565667@collabora.com Fixes: 0f8db8cc73df ("selinux: add AF_UNSPEC and INADDR_ANY checks to selinux_socket_bind()") Signed-off-by: Mickaël Salaün mic@digikod.net Tested-by: Muhammad Usama Anjum usama.anjum@collabora.com Signed-off-by: Paul Moore paul@paul-moore.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/selinux/hooks.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index d9f15c84aab7..c1bf319b459a 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4625,6 +4625,13 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in return -EINVAL; addr4 = (struct sockaddr_in *)address; if (family_sa == AF_UNSPEC) { + if (family == PF_INET6) { + /* Length check from inet6_bind_sk() */ + if (addrlen < SIN6_LEN_RFC2133) + return -EINVAL; + /* Family check from __inet6_bind() */ + goto err_af; + } /* see __inet_bind(), we only want to allow * AF_UNSPEC if the address is INADDR_ANY */