122 lines
4.6 KiB
Diff
122 lines
4.6 KiB
Diff
From 30838132997e6a3cfe3ec11c58b32b22f6f6b102 Mon Sep 17 00:00:00 2001
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From: Alan Modra <amodra@gmail.com>
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Date: Thu, 20 Sep 2018 15:29:17 +0930
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Subject: [PATCH 1/1] Bug 23686, two segment faults in nm
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Fixes the bugs exposed by the testcases in the PR, plus two more bugs
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I noticed when looking at _bfd_stab_section_find_nearest_line.
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PR 23686
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* dwarf2.c (read_section): Error when attempting to malloc
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"(bfd_size_type) -1".
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* syms.c (_bfd_stab_section_find_nearest_line): Bounds check
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function_name. Bounds check reloc address. Formatting. Ensure
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.stabstr zero terminated.
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---
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diff -urNp a/bfd/ChangeLog b/bfd/ChangeLog
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--- a/bfd/ChangeLog 2019-06-05 22:52:23.600000000 +0800
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+++ b/bfd/ChangeLog 2019-06-05 22:55:03.060000000 +0800
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@@ -1,3 +1,11 @@
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+2018-09-20 Alan Modra <amodra@gmail.com>
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+ PR 23686
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+ * dwarf2.c (read_section): Error when attempting to malloc
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+ "(bfd_size_type) -1".
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+ * syms.c (_bfd_stab_section_find_nearest_line): Bounds check
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+ function_name. Bounds check reloc address. Formatting. Ensure
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+ .stabstr zero terminated.
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+
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2018-07-18 Nick Clifton <nickc@redhat.com>
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2.31.1 Release point.
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diff -urNp a/bfd/dwarf2.c b/bfd/dwarf2.c
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--- a/bfd/dwarf2.c 2019-06-05 22:52:23.950000000 +0800
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+++ b/bfd/dwarf2.c 2019-06-05 23:09:09.540000000 +0800
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@@ -527,6 +527,7 @@ read_section (bfd * abfd,
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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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@@ -549,7 +550,13 @@ read_section (bfd * abfd,
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*section_size = msec->rawsize ? msec->rawsize : msec->size;
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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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- contents = (bfd_byte *) bfd_malloc (*section_size + 1);
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+ amt = *section_size + 1;
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+ if (amt == 0)
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+ {
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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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+ contents = (bfd_byte *) bfd_malloc (amt);
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if (contents == NULL)
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return FALSE;
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if (syms
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diff -urNp a/bfd/syms.c b/bfd/syms.c
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--- a/bfd/syms.c 2019-06-05 22:52:24.840000000 +0800
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+++ b/bfd/syms.c 2019-06-05 23:38:05.300000000 +0800
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@@ -1035,6 +1035,11 @@ _bfd_stab_section_find_nearest_line (bfd
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0, strsize))
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return FALSE;
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+ /* Stab strings ought to be nul terminated. Ensure the last one
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+ is, to prevent running off the end of the buffer. */
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+ info->strs[strsize - 1] = 0;
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+
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+
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/* If this is a relocatable object file, we have to relocate
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the entries in .stab. This should always be simple 32 bit
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relocations against symbols defined in this object file, so
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@@ -1073,7 +1078,8 @@ _bfd_stab_section_find_nearest_line (bfd
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|| r->howto->bitsize != 32
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|| r->howto->pc_relative
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|| r->howto->bitpos != 0
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- || r->howto->dst_mask != 0xffffffff)
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+ || r->howto->dst_mask != 0xffffffff
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+ || r->address * bfd_octets_per_byte (abfd) + 4 > stabsize)
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{
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_bfd_error_handler
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(_("unsupported .stab relocation"));
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@@ -1195,7 +1201,8 @@ _bfd_stab_section_find_nearest_line (bfd
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{
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nul_fun = stab;
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nul_str = str;
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- if (file_name >= (char *) info->strs + strsize || file_name < (char *) str)
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+ if (file_name >= (char *) info->strs + strsize
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+ || file_name < (char *) str)
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file_name = NULL;
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if (stab + STABSIZE + TYPEOFF < info->stabs + stabsize
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&& *(stab + STABSIZE + TYPEOFF) == (bfd_byte) N_SO)
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@@ -1206,7 +1213,8 @@ _bfd_stab_section_find_nearest_line (bfd
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directory_name = file_name;
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file_name = ((char *) str
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+ bfd_get_32 (abfd, stab + STRDXOFF));
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- if (file_name >= (char *) info->strs + strsize || file_name < (char *) str)
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+ if (file_name >= (char *) info->strs + strsize
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+ || file_name < (char *) str)
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file_name = NULL;
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}
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}
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@@ -1217,7 +1225,8 @@ _bfd_stab_section_find_nearest_line (bfd
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file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
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/* PR 17512: file: 0c680a1f. */
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/* PR 17512: file: 5da8aec4. */
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- if (file_name >= (char *) info->strs + strsize || file_name < (char *) str)
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+ if (file_name >= (char *) info->strs + strsize
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+ || file_name < (char *) str)
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file_name = NULL;
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break;
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@@ -1335,7 +1344,8 @@ _bfd_stab_section_find_nearest_line (bfd
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if (val <= offset)
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{
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file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
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- if (file_name >= (char *) info->strs + strsize || file_name < (char *) str)
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+ if (file_name >= (char *) info->strs + strsize
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+ || file_name < (char *) str)
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file_name = NULL;
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*pline = 0;
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}
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