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Allow IFUNC relocation against unrelocated shared library

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IFUNC relocation against definition in unrelocated shared library
will lead to segfault when the IFUNC function is called.  This
patch allows such IFUNC relocations with a warning.  This isn't
a real fix for

https://sourceware.org/bugzilla/show_bug.cgi?id=21041

It simply allows the program to load.  The program will segfault
when longjmp is called.

	* sysdeps/i386/dl-machine.h (elf_machine_rel): Replace
	_dl_fatal_printf with _dl_error_printf for IFUNC relocation
	against unrelocated shared library.
	* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Likewise.
This commit is contained in:
H.J. Lu 2017-02-02 13:14:43 -08:00
parent ed8d5ffd0a
commit 6fab532b47
3 changed files with 9 additions and 2 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2017-02-02 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/i386/dl-machine.h (elf_machine_rel): Replace
_dl_fatal_printf with _dl_error_printf for IFUNC relocation
against unrelocated shared library.
* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Likewise.
2017-02-02 Siddhesh Poyarekar <siddhesh@sourceware.org>
* sysdeps/generic/unsecvars.h: Add GLIBC_TUNABLES.

2
sysdeps/i386/dl-machine.h
View File

@ -329,7 +329,7 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
{
const char *strtab
= (const char *) D_PTR (map, l_info[DT_STRTAB]);
_dl_fatal_printf ("\
_dl_error_printf ("\
%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
RTLD_PROGNAME, map->l_name,
sym_map->l_name,

2
sysdeps/x86_64/dl-machine.h
View File

@ -339,7 +339,7 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
{
const char *strtab
= (const char *) D_PTR (map, l_info[DT_STRTAB]);
_dl_fatal_printf ("\
_dl_error_printf ("\
%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
RTLD_PROGNAME, map->l_name,
sym_map->l_name,