72 lines
2.6 KiB
Diff
72 lines
2.6 KiB
Diff
From 9ca499644a21ceb3f946d1c179c38a83be084490 Mon Sep 17 00:00:00 2001
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From: "H.J. Lu" <hjl.tools@gmail.com>
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Date: Thu, 18 Sep 2025 16:59:25 -0700
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Subject: [PATCH] elf: Don't match corrupt section header in linker input
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Don't swap in nor match corrupt section header in linker input to avoid
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linker crash later.
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PR ld/33457
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* elfcode.h (elf_swap_shdr_in): Changed to return bool. Return
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false for corrupt section header in linker input.
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(elf_object_p): Reject if elf_swap_shdr_in returns false.
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Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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---
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bfd/elfcode.h | 14 +++++++++-----
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1 file changed, 9 insertions(+), 5 deletions(-)
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--- binutils-2.40.orig/bfd/elfcode.h 2025-11-27 14:21:37.669884082 +0000
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+++ binutils-2.40/bfd/elfcode.h 2025-11-27 14:22:11.297013798 +0000
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@@ -298,7 +298,7 @@ elf_swap_ehdr_out (bfd *abfd,
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/* Translate an ELF section header table entry in external format into an
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ELF section header table entry in internal format. */
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-static void
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+static bool
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elf_swap_shdr_in (bfd *abfd,
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const Elf_External_Shdr *src,
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Elf_Internal_Shdr *dst)
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@@ -328,6 +328,9 @@ elf_swap_shdr_in (bfd *abfd,
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{
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_bfd_error_handler (_("warning: %pB has a section "
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"extending past end of file"), abfd);
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+ /* PR ld/33457: Don't match corrupt section header. */
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+ if (abfd->is_linker_input)
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+ return false;
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abfd->read_only = 1;
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}
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}
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@@ -337,6 +340,7 @@ elf_swap_shdr_in (bfd *abfd,
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dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize);
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dst->bfd_section = NULL;
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dst->contents = NULL;
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+ return true;
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}
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/* Translate an ELF section header table entry in internal format into an
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@@ -629,9 +633,9 @@ elf_object_p (bfd *abfd)
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/* Read the first section header at index 0, and convert to internal
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form. */
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- if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
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+ if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)
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+ || !elf_swap_shdr_in (abfd, &x_shdr, &i_shdr))
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goto got_no_match;
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- elf_swap_shdr_in (abfd, &x_shdr, &i_shdr);
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/* If the section count is zero, the actual count is in the first
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section header. */
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@@ -717,9 +721,9 @@ elf_object_p (bfd *abfd)
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to internal form. */
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for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
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{
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- if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
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+ if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)
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+ || !elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex))
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goto got_no_match;
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- elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
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/* Sanity check sh_link and sh_info. */
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if (i_shdrp[shindex].sh_link >= num_sec)
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