On Wed, Apr 22, 2020 at 10:24:44PM -0000, tip-bot2 for Sami Tolvanen wrote:
> The following commit has been merged into the objtool/core branch of tip:
>
> Commit-ID: e2ccbff8f02d6b140b8ee71108264686c19b1c78
> Gitweb: https://git.kernel.org/tip/e2ccbff8f02d6b140b8ee71108264686c19b1c78
> Author: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
> AuthorDate: Tue, 21 Apr 2020 11:25:01 -07:00
> Committer: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
> CommitterDate: Tue, 21 Apr 2020 18:49:15 -05:00
>
> objtool: Use sh_info to find the base for .rela sections
>
> ELF doesn't require .rela section names to match the base section. Use
> the section index in sh_info to find the section instead of looking it
> up by name.
>
> LLD, for example, generates a .rela section that doesn't match the base
> section name when we merge sections in a linker script for a binary
> compiled with -ffunction-sections.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Hi!
Where did this commit end up? It seems to have vanished (404 on the
Gitweb link) and isn't in -next nor Linus's tree.
This is needed for LTO, FGKASLR, and link speed improvements[1]. Is it
possible to get this landed in -rc2 so all the things depending on it
can rebase happily?
Thanks!
-Kees
[1] https://lore.kernel.org/lkml/CAK7LNARbZhoaA=Nnuw0=gBrkuKbr_4Ng_Ei57uafujZf7Xazgw@xxxxxxxxxxxxxx/
> ---
> tools/objtool/elf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
> index c4857fa..c20dfe1 100644
> --- a/tools/objtool/elf.c
> +++ b/tools/objtool/elf.c
> @@ -468,7 +468,7 @@ static int read_relas(struct elf *elf)
> if (sec->sh.sh_type != SHT_RELA)
> continue;
>
> - sec->base = find_section_by_name(elf, sec->name + 5);
> + sec->base = find_section_by_index(elf, sec->sh.sh_info);
> if (!sec->base) {
> WARN("can't find base section for rela section %s",
> sec->name);
--
Kees Cook
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