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