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Check IFUNC definition in unrelocated shared library [BZ #20019] 

Calling an IFUNC function defined in unrelocated shared library may
lead to segfault.  This patch issues an error message to request
relinking the shared library if it references IFUNC function defined
in the unrelocated shared library.

	[BZ #20019]
	* sysdeps/i386/dl-machine.h (elf_machine_rel): Check IFUNC
	definition in unrelocated shared library.
	* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Likewise.
This commit is contained in:
H.J. Lu 2016-10-28 09:11:55 -07:00
parent 6b1df8b27f
commit 0e6d3adc60
3 changed files with 41 additions and 2 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2016-10-28 H.J. Lu <hongjiu.lu@intel.com>
[BZ #20019]
* sysdeps/i386/dl-machine.h (elf_machine_rel): Check IFUNC
definition in unrelocated shared library.
* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Likewise.
2016-10-28 Florian Weimer <fweimer@redhat.com>
[BZ #20729]

18
sysdeps/i386/dl-machine.h
View File

@ -321,7 +321,23 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
0)
&& __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
&& __builtin_expect (!skip_ifunc, 1))
value = ((Elf32_Addr (*) (void)) value) ();
{
# ifndef RTLD_BOOTSTRAP
if (sym_map != map
&& sym_map->l_type != lt_executable
&& !sym_map->l_relocated)
{
const char *strtab
= (const char *) D_PTR (map, l_info[DT_STRTAB]);
_dl_fatal_printf ("\
%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
RTLD_PROGNAME, map->l_name,
sym_map->l_name,
strtab + refsym->st_name);
}
# endif
value = ((Elf32_Addr (*) (void)) value) ();
}
switch (r_type)
{

18
sysdeps/x86_64/dl-machine.h
View File

@ -331,7 +331,23 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
0)
&& __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
&& __builtin_expect (!skip_ifunc, 1))
value = ((ElfW(Addr) (*) (void)) value) ();
{
# ifndef RTLD_BOOTSTRAP
if (sym_map != map
&& sym_map->l_type != lt_executable
&& !sym_map->l_relocated)
{
const char *strtab
= (const char *) D_PTR (map, l_info[DT_STRTAB]);
_dl_fatal_printf ("\
%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
RTLD_PROGNAME, map->l_name,
sym_map->l_name,
strtab + refsym->st_name);
}
# endif
value = ((ElfW(Addr) (*) (void)) value) ();
}
switch (r_type)
{