Hi Aaron,
On Tue, Nov 05, 2024 at 05:53:38PM -0500, Aaron Merey wrote:
> strip --reloc-debug-sections-only is expected to be a no-op for
> non-ET_REL files. This was not enforced in the code. Sections
> were copied over to a new output file and normally its contents
> would be identical to the input file.
>
> However the output file is not identical to a non-ET_REL input
> file if the linker organized sections such that the indices of
> SHF_ALLOC sections are not in a contigous group.
>
> In this case strip will modify sections in order to keep all SHF_ALLOC
> sections in a contiguous group.
>
> Fix this by ignoring --reloc-debug-sections-only for non-ET_REL files.
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=32253
>
> Signed-off-by: Aaron Merey <[email protected]>
> ---
> src/strip.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/src/strip.c b/src/strip.c
> index 403e0f6f..3812fb17 100644
> --- a/src/strip.c
> +++ b/src/strip.c
> @@ -1139,6 +1139,13 @@ handle_elf (int fd, Elf *elf, const char *prefix,
> const char *fname,
>
> if (reloc_debug_only)
> {
> + if (ehdr->e_type != ET_REL)
> + {
> + /* Only ET_REL files should have debug relocations to remove. */
> + error (0, 0, _("Ignoring --reloc-debug-sections-only for " \
> + "non-ET_REL file '%s'"), fname);
> + goto fail_close;
> + }
Do we have to fail here? I think it is nicer for the user to just
turn this into an warning with
if (ehdr->e_type != ET_REL) else if (handle_debug_relocs (...))
> if (handle_debug_relocs (elf, ebl, newelf, ehdr, fname, shstrndx,
> &lastsec_offset, &lastsec_size) != 0)
> {
Cheers,
Mark
