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elf: Check for corrupt symbol version info 

The BFD linker with PR ld/23499 may generate shared libraries with
corrupt symbol version info which leads to linker error when the
corrupt shared library is used:

/usr/bin/ld: bin/libKF5Service.so.5.49.0: _edata: invalid version 21 (max 0)
/usr/bin/ld: bin/libKF5Service.so.5.49.0: error adding symbols: bad value

Add check for corrupt symbol version info to objdump:

00000000000af005 g    D  .data	0000000000000000  <corrupt>   _edata

and readelf:

   728: 00000000000af005     0 NOTYPE  GLOBAL DEFAULT   25 _edata@<corrupt> (5)

bfd/

	PR ld/23499
	* elf.c (_bfd_elf_get_symbol_version_string): Return
	_("<corrupt>") for corrupt symbol version info.

binutils/

	PR ld/23499
	* readelf.c (get_symbol_version_string): Return _("<corrupt>")
	for corrupt symbol version info.
This commit is contained in:
H.J. Lu 2018-08-25 06:17:52 -07:00
parent bbf6c6b8ca
commit 7a815dd566
4 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2018-08-25 H.J. Lu <hongjiu.lu@intel.com>
PR ld/23499
* elf.c (_bfd_elf_get_symbol_version_string): Return
_("<corrupt>") for corrupt symbol version info.
2018-08-24 H.J. Lu <hongjiu.lu@intel.com>
* elfxx-x86.c (_bfd_x86_elf_parse_gnu_properties): Handle

2
bfd/elf.c
View File

@ -1877,7 +1877,7 @@ _bfd_elf_get_symbol_version_string (bfd *abfd, asymbol *symbol,
{
Elf_Internal_Verneed *t;
version_string = "";
version_string = _("<corrupt>");
for (t = elf_tdata (abfd)->verref;
t != NULL;
t = t->vn_nextref)

6
binutils/ChangeLog
View File

@ -1,3 +1,9 @@
2018-08-25 H.J. Lu <hongjiu.lu@intel.com>
PR ld/23499
* readelf.c (get_symbol_version_string): Return _("<corrupt>")
for corrupt symbol version info.
2018-08-24 H.J. Lu <hongjiu.lu@intel.com>
* readelf.c (decode_x86_compat_isa): New function.

9
binutils/readelf.c
View File

@ -11300,6 +11300,7 @@ get_symbol_version_string (Filedata * filedata,
unsigned char data[2];
unsigned short vers_data;
unsigned long offset;
unsigned short max_vd_ndx;
if (!is_dynsym
|| version_info[DT_VERSIONTAGIDX (DT_VERSYM)] == 0)
@ -11317,6 +11318,8 @@ get_symbol_version_string (Filedata * filedata,
if ((vers_data & VERSYM_HIDDEN) == 0 && vers_data == 0)
return NULL;
max_vd_ndx = 0;
/* Usually we'd only see verdef for defined symbols, and verneed for
undefined symbols. However, symbols defined by the linker in
.dynbss for variables copied from a shared library in order to
@ -11359,6 +11362,9 @@ get_symbol_version_string (Filedata * filedata,
ivd.vd_flags = BYTE_GET (evd.vd_flags);
}
if ((ivd.vd_ndx & VERSYM_VERSION) > max_vd_ndx)
max_vd_ndx = ivd.vd_ndx & VERSYM_VERSION;
off += ivd.vd_next;
}
while (ivd.vd_ndx != (vers_data & VERSYM_VERSION) && ivd.vd_next != 0);
@ -11450,6 +11456,9 @@ get_symbol_version_string (Filedata * filedata,
return (ivna.vna_name < strtab_size
? strtab + ivna.vna_name : _("<corrupt>"));
}
else if ((max_vd_ndx || (vers_data & VERSYM_VERSION) != 1)
&& (vers_data & VERSYM_VERSION) > max_vd_ndx)
return _("<corrupt>");
}
return NULL;
}