From 3ad490ea48468e50fe91f6f6b2ca4cbc74d924bf Mon Sep 17 00:00:00 2001 From: Aleksandr Nogikh Date: Mon, 18 Dec 2023 11:58:39 +0100 Subject: executor: introduce syz_pidfd_open() This kernel interface provides access to fds of other processes, which is readily abused by the fuzzer to mangle parent syz-executor fds. Pid=1 is the parent syz-executor process when PID namespace is created. Sanitize it in the new syz_pidfd_open() pseudo-syscall. We could not patch the argument in sys/linux/init.go because the first argument is a resource. --- pkg/host/syscalls_linux.go | 1 + 1 file changed, 1 insertion(+) (limited to 'pkg/host/syscalls_linux.go') diff --git a/pkg/host/syscalls_linux.go b/pkg/host/syscalls_linux.go index b1bcbfb8b..d59fe491b 100644 --- a/pkg/host/syscalls_linux.go +++ b/pkg/host/syscalls_linux.go @@ -327,6 +327,7 @@ var syzkallSupport = map[string]func(*prog.Syscall, *prog.Target, string) (bool, "syz_clone3": alwaysSupported, "syz_pkey_set": isSyzPkeySetSupported, "syz_socket_connect_nvme_tcp": isSyzSocketConnectNvmeTCPSupported, + "syz_pidfd_open": alwaysSupported, } func isSupportedSyzkall(c *prog.Syscall, target *prog.Target, sandbox string) (bool, string) { -- cgit mrf-deployment