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bpf: Change bpf_kallsyms_lookup_name size type to ARG_CONST_SIZE_OR_ZERO 

Bugzilla: https://bugzilla.redhat.com/2069046

Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit d4efb170861827290f7f571020001a60d001faaf
Author: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date:   Tue Nov 23 05:27:31 2021 +0530

    bpf: Change bpf_kallsyms_lookup_name size type to ARG_CONST_SIZE_OR_ZERO

    Andrii mentioned in [0] that switching to ARG_CONST_SIZE_OR_ZERO lets
    user avoid having to prove that string size at runtime is not zero and
    helps with not having to supress clang optimizations.

      [0]: https://lore.kernel.org/bpf/CAEf4BzZa_vhXB3c8atNcTS6=krQvC25H7K7c3WWZhM=27ro=Wg@mail.gmail.com

    Suggested-by: Andrii Nakryiko <andrii@kernel.org>
    Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Acked-by: Song Liu <songliubraving@fb.com>
    Link: https://lore.kernel.org/bpf/20211122235733.634914-2-memxor@gmail.com

Signed-off-by: Artem Savkov <asavkov@redhat.com>
This commit is contained in:
Artem Savkov 2022-06-10 15:03:56 +02:00
parent c0fa6bfafe
commit c7330c1abb
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/syscall.c
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@ -4837,7 +4837,7 @@ const struct bpf_func_proto bpf_kallsyms_lookup_name_proto = {
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_MEM,
.arg2_type = ARG_CONST_SIZE,
.arg2_type = ARG_CONST_SIZE_OR_ZERO,
.arg3_type = ARG_ANYTHING,
.arg4_type = ARG_PTR_TO_LONG,
};