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Backport upstream commit 8f2c64de86b which fixes RHBZ 2233961,

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CVE-2022-48064, (Alan Modra).
This commit is contained in:
Alexandra Hájková 2023-09-17 13:45:41 +02:00
parent ba3a754341
commit a5080fa18b
5 changed files with 60 additions and 0 deletions
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4
_gdb.spec.Patch.include
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@ -215,3 +215,7 @@ Patch048: gdb-bz2237515-debuginfod-double-free.patch
# obstack allocation that wold lead to memory corruption.
Patch049: gdb-bz2237392-dwarf-obstack-allocation.patch
# Backport PR29922, SHT_NOBITS section
# avoids section size sanity check.
Patch050: gdb-rhbz2233961-CVE-2022-4806.patch

1
_gdb.spec.patch.include
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@ -47,3 +47,4 @@
%patch -p1 -P047
%patch -p1 -P048
%patch -p1 -P049
%patch -p1 -P050

1
_patch_order
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@ -47,3 +47,4 @@ gdb-rhbz2160211-excessive-core-file-warnings.patch
gdb-bz2196395-debuginfod-legacy-openssl-crash.patch
gdb-bz2237515-debuginfod-double-free.patch
gdb-bz2237392-dwarf-obstack-allocation.patch
gdb-rhbz2233961-CVE-2022-4806.patch

50
gdb-rhbz2233961-CVE-2022-4806.patch Normal file
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@ -0,0 +1,50 @@
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexandra=20H=C3=A1jkov=C3=A1?= <ahajkova@redhat.com>
Date: Sun, 17 Sep 2023 13:36:13 +0200
Subject: gdb-rhbz2233961-CVE-2022-4806.patch
;; Backport PR29922, SHT_NOBITS section
;; avoids section size sanity check.
PR29922, SHT_NOBITS section avoids section size sanity check
PR 29922
* dwarf2.c (find_debug_info): Ignore sections without
SEC_HAS_CONTENTS.
diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -4831,16 +4831,19 @@ find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections,
{
look = debug_sections[debug_info].uncompressed_name;
msec = bfd_get_section_by_name (abfd, look);
- if (msec != NULL)
+ /* Testing SEC_HAS_CONTENTS is an anti-fuzzer measure. Of
+ course debug sections always have contents. */
+ if (msec != NULL && (msec->flags & SEC_HAS_CONTENTS) != 0)
return msec;
look = debug_sections[debug_info].compressed_name;
msec = bfd_get_section_by_name (abfd, look);
- if (msec != NULL)
+ if (msec != NULL && (msec->flags & SEC_HAS_CONTENTS) != 0)
return msec;
for (msec = abfd->sections; msec != NULL; msec = msec->next)
- if (startswith (msec->name, GNU_LINKONCE_INFO))
+ if ((msec->flags & SEC_HAS_CONTENTS) != 0
+ && startswith (msec->name, GNU_LINKONCE_INFO))
return msec;
return NULL;
@@ -4848,6 +4851,9 @@ find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections,
for (msec = after_sec->next; msec != NULL; msec = msec->next)
{
+ if ((msec->flags & SEC_HAS_CONTENTS) == 0)
+ continue;
+
look = debug_sections[debug_info].uncompressed_name;
if (strcmp (msec->name, look) == 0)
return msec;

4
gdb.spec
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@ -1252,6 +1252,10 @@ fi
%endif
%changelog
* Sun Sep 17 2023 Alexandra Hájková <ahajkova@redhat.com> - 13.2-8
- Backport upstream commit 8f2c64de86b which fixes RHBZ 2233961,
CVE-2022-48064, (Alan Modra).
* Fri Sep 15 2023 Keith Seitz <keiths@redhat.com> - 13.2-8
- migrated to SPDX license