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authorH.J. Lu <hjl.tools@gmail.com>2020-12-28 05:28:49 -0800
committerH.J. Lu <hjl.tools@gmail.com>2021-01-04 12:01:01 -0800
commit6ea5b57afa5cdc9ce367d2b69a2cebfb273e4617 (patch)
tree83999cf707019850aaf4c646e4044f53242537a1 /sysdeps/i386
parentb47b07c92d82df497ad4e3abebfdab51be5d0546 (diff)
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x86: Check IFUNC definition in unrelocated executable [BZ #20019]
Calling an IFUNC function defined in unrelocated executable also leads to
segfault.  Issue a fatal error message when calling IFUNC function defined
in the unrelocated executable from a shared library.
Diffstat (limited to 'sysdeps/i386')
-rw-r--r--sysdeps/i386/dl-machine.h16
1 files changed, 11 insertions, 5 deletions
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
index 50960605e6..23e9cc3bfb 100644
--- a/sysdeps/i386/dl-machine.h
+++ b/sysdeps/i386/dl-machine.h
@@ -337,16 +337,22 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
 	{
 # 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_error_printf ("\
+	      if (sym_map->l_type == lt_executable)
+		_dl_fatal_printf ("\
+%s: IFUNC symbol '%s' referenced in '%s' is defined in the executable \
+and creates an unsatisfiable circular dependency.\n",
+				  RTLD_PROGNAME, strtab + refsym->st_name,
+				  map->l_name);
+	      else
+		_dl_error_printf ("\
 %s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
-				RTLD_PROGNAME, map->l_name,
-				sym_map->l_name,
-				strtab + refsym->st_name);
+				  RTLD_PROGNAME, map->l_name,
+				  sym_map->l_name,
+				  strtab + refsym->st_name);
 	    }
 # endif
 	  value = ((Elf32_Addr (*) (void)) value) ();