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From: Nick Clifton <nickc@redhat.com>
Date: Thu, 26 Nov 2020 17:08:33 +0000 (+0000)
Subject: Prevent a memory allocation failure when parsing corrupt DWARF debug sections.
X-Git-Tag: binutils-2_36~485
X-Git-Url: https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff_plain;h=647cebce12a6b0a26960220caff96ff38978cf24;hp=239ca5e497dda2c151009d664d500086a5c2173a
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;
}
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