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PR27952, Disallow ET_DYN DF_1_PIE linker input

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This patch adds a new elf_tdata flag, is_pie, set during the linker's
open_input_bfds processing.  The flag is then used to reject attempts
to link a PIE as if it were a shared library.

bfd/
	PR 27952
	* elf-bfd.h (struct elf_obj_tdata): Add is_pie.
	* elflink.c (elf_link_add_object_symbols): Set is_pie.
ld/
	PR 27952
	* ldelf.c (ldelf_after_open): Error on input PIEs too.
This commit is contained in:
Alan Modra
2021-06-11 14:06:47 +09:30
parent 860cc54cd4
commit f64b9b13ce
5 changed files with 19 additions and 1 deletions
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4
ld/ldelf.c
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@@ -1048,7 +1048,9 @@ ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd,
&& elf_tdata (abfd) != NULL
&& elf_tdata (abfd)->elf_header != NULL
/* FIXME: Maybe check for other non-supportable types as well ? */
&& elf_tdata (abfd)->elf_header->e_type == ET_EXEC)
&& (elf_tdata (abfd)->elf_header->e_type == ET_EXEC
|| (elf_tdata (abfd)->elf_header->e_type == ET_DYN
&& elf_tdata (abfd)->is_pie)))
einfo (_("%F%P: cannot use executable file '%pB' as input to a link\n"),
abfd);
}