Commit 2fe88908 authored Dec 03, 2020 by Andrii Nakryiko Committed by Alexei Starovoitov Dec 03, 2020

bpf: Keep module's btf_data_size intact after load

Having real btf_data_size stored in struct module is benefitial to quickly
determine which kernel modules have associated BTF object and which don't.
There is no harm in keeping this info, as opposed to keeping invalid pointer.

Fixes: 607c543f ("bpf: Sanitize BTF data pointer after module is loaded")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201203204634.1325171-3-andrii@kernel.org

parent 12cc126d

kernel/module.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -3712,7 +3712,6 @@ static noinline int do_init_module(struct module *mod)
		#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