Re: [PATCH v5 06/21] modpost: clean up is_executable_section()

Nick Desaulniers
2023-05-17T21:10:58Z

On Sun, May 14, 2023 at 8:28 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> SHF_EXECINSTR is a bit flag (#define SHF_EXECINSTR 0x4).
> Compare the masked flag to '!= 0'.
>
> There is no good reason to stop modpost immediately even if a special
> section index is given. You will get a section mismatch error anyway.
>
> Also, change the return type to bool.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Moving the definition and renaming the parameter seems very
unnecessary, but whatever. Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
>
> scripts/mod/modpost.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index bb7d1d87bae7..0bda2f22c985 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -1207,6 +1207,14 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
> return near;
> }
>
> +static bool is_executable_section(struct elf_info *elf, unsigned int secndx)
> +{
> + if (secndx > elf->num_sections)
> + return false;
> +
> + return (elf->sechdrs[secndx].sh_flags & SHF_EXECINSTR) != 0;
> +}
> +
> static void default_mismatch_handler(const char *modname, struct elf_info *elf,
> const struct sectioncheck* const mismatch,
> Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
> @@ -1252,14 +1260,6 @@ static void default_mismatch_handler(const char *modname, struct elf_info *elf,
> }
> }
>
> -static int is_executable_section(struct elf_info* elf, unsigned int section_index)
> -{
> - if (section_index > elf->num_sections)
> - fatal("section_index is outside elf->num_sections!\n");
> -
> - return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
> -}
> -
> static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
> const struct sectioncheck* const mismatch,
> Elf_Rela* r, Elf_Sym* sym,
> --
> 2.39.2
>

--
Thanks,
~Nick Desaulniers