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From 7ecb51549ab1ec22aba5aaf34b70323cf0b8509a Mon Sep 17 00:00:00 2001
From: Alan Modra <amodra@gmail.com>
Date: Wed, 15 Apr 2020 18:58:11 +0930
Subject: [PATCH] PR25823, Use after free in bfd_hash_lookup
PR 25823
* peXXigen.c (_bfd_XXi_swap_sym_in <C_SECTION>): Don't use a
pointer into strings that may be freed for section name, always
allocate a new string.
Upstream-Status: Backport [https://sourceware.org/git/?p=binutils-gdb.git;a=patch;h=7ecb51549ab1ec22aba5aaf34b70323cf0b8509a]
CVE: CVE-2020-16592
Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
---
bfd/peXXigen.c | 20 ++++++++++----------
1 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/bfd/peXXigen.c b/bfd/peXXigen.c
index b9eeb775d9b..8aa5914acd9 100644
--- a/bfd/peXXigen.c
+++ b/bfd/peXXigen.c
@@ -177,25 +177,25 @@ _bfd_XXi_swap_sym_in (bfd * abfd, void * ext1, void * in1)
int unused_section_number = 0;
asection *sec;
flagword flags;
+ size_t name_len;
+ char *sec_name;
for (sec = abfd->sections; sec; sec = sec->next)
if (unused_section_number <= sec->target_index)
unused_section_number = sec->target_index + 1;
- if (name == namebuf)
+ name_len = strlen (name) + 1;
+ sec_name = bfd_alloc (abfd, name_len);
+ if (sec_name == NULL)
{
- name = (const char *) bfd_alloc (abfd, strlen (namebuf) + 1);
- if (name == NULL)
- {
- _bfd_error_handler (_("%pB: out of memory creating name for empty section"),
- abfd);
- return;
- }
- strcpy ((char *) name, namebuf);
+ _bfd_error_handler (_("%pB: out of memory creating name "
+ "for empty section"), abfd);
+ return;
}
+ memcpy (sec_name, name, name_len);
flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_DATA | SEC_LOAD;
- sec = bfd_make_section_anyway_with_flags (abfd, name, flags);
+ sec = bfd_make_section_anyway_with_flags (abfd, sec_name, flags);
if (sec == NULL)
{
_bfd_error_handler (_("%pB: unable to create fake empty section"),
--
2.27.0
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