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