bpf: Sanitize BTF data pointer after module is loaded

Given .BTF section is not allocatable, it will get trimmed after module is
loaded. BPF system handles that properly by creating an independent copy of
data. But prevent any accidental misused by resetting the pointer to BTF data.

Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs")
Suggested-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jessica Yu <jeyu@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/bpf/20201121070829.2612884-2-andrii@kernel.org

diff --git a/kernel/module.c b/kernel/module.c
index f2996b0..18f259d 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3709,6 +3709,11 @@ static noinline int do_init_module(struct module *mod)
        mod->init_layout.ro_size = 0;
        mod->init_layout.ro_after_init_size = 0;
        mod->init_layout.text_size = 0;
+#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
+       /* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */
+       mod->btf_data = NULL;
+       mod->btf_data_size = 0;
+#endif
        /*
         * We want to free module_init, but be aware that kallsyms may be
         * walking this with preempt disabled.  In all the failure paths, we