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-rw-r--r--main/binutils/CVE-2021-3487.patch72
1 files changed, 72 insertions, 0 deletions
diff --git a/main/binutils/CVE-2021-3487.patch b/main/binutils/CVE-2021-3487.patch
new file mode 100644
index 0000000000..db99ae73d9
--- /dev/null
+++ b/main/binutils/CVE-2021-3487.patch
@@ -0,0 +1,72 @@
+From 647cebce12a6b0a26960220caff96ff38978cf24 Mon Sep 17 00:00:00 2001
+From: Nick Clifton <nickc@redhat.com>
+Date: Thu, 26 Nov 2020 17:08:33 +0000
+Subject: [PATCH] Prevent a memory allocation failure when parsing corrupt
+ DWARF debug sections.
+
+ PR 26946
+ * dwarf2.c (read_section): Check for debug sections with excessive
+ sizes.
+
+diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
+index 977bf43a6a1..8bbfc81d3e7 100644
+--- a/bfd/dwarf2.c
++++ b/bfd/dwarf2.c
+@@ -531,22 +531,24 @@ read_section (bfd * abfd,
+ bfd_byte ** section_buffer,
+ bfd_size_type * section_size)
+ {
+- asection *msec;
+ const char *section_name = sec->uncompressed_name;
+ bfd_byte *contents = *section_buffer;
+- bfd_size_type amt;
+
+ /* The section may have already been read. */
+ if (contents == NULL)
+ {
++ bfd_size_type amt;
++ asection *msec;
++ ufile_ptr filesize;
++
+ msec = bfd_get_section_by_name (abfd, section_name);
+- if (! msec)
++ if (msec == NULL)
+ {
+ section_name = sec->compressed_name;
+ if (section_name != NULL)
+ msec = bfd_get_section_by_name (abfd, section_name);
+ }
+- if (! msec)
++ if (msec == NULL)
+ {
+ _bfd_error_handler (_("DWARF error: can't find %s section."),
+ sec->uncompressed_name);
+@@ -554,12 +556,23 @@ read_section (bfd * abfd,
+ return FALSE;
+ }
+
+- *section_size = msec->rawsize ? msec->rawsize : msec->size;
++ amt = bfd_get_section_limit_octets (abfd, msec);
++ filesize = bfd_get_file_size (abfd);
++ if (amt >= filesize)
++ {
++ /* PR 26946 */
++ _bfd_error_handler (_("DWARF error: section %s is larger than its filesize! (0x%lx vs 0x%lx)"),
++ section_name, (long) amt, (long) filesize);
++ bfd_set_error (bfd_error_bad_value);
++ return FALSE;
++ }
++ *section_size = amt;
+ /* Paranoia - alloc one extra so that we can make sure a string
+ section is NUL terminated. */
+- amt = *section_size + 1;
++ amt += 1;
+ if (amt == 0)
+ {
++ /* Paranoia - this should never happen. */
+ bfd_set_error (bfd_error_no_memory);
+ return FALSE;
+ }
+--
+2.27.0
+