File dl-lookup-ignore-spurious-version.patch of Package glibc

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File dl-lookup-ignore-spurious-version.patch of Package glibc

From: Michal Suchanek <msuchanek@suse.de>
Sublect: dl-lookup: Ignore spurious version

Debian/Ubuntu add symbol arbitrary versioning to libraries. This causes
software built for these distributions to not run elsewhere. As a workaround
try to lookup a non-versioned symbol when versioned lookup fails and
LD_VERSION_FIXUP is set.

Index: glibc-2.31/elf/dl-lookup.c
===================================================================
--- glibc-2.31.orig/elf/dl-lookup.c
+++ glibc-2.31/elf/dl-lookup.c
@@ -865,6 +865,8 @@ _dl_lookup_symbol_x (const char *undef_n
 
   if (__glibc_unlikely (current_value.s == NULL))
     {
+      if (version && GLRO(dl_version_fixup)) /* Retry without version if lookup fails */
+	      return _dl_lookup_symbol_x(undef_name, undef_map, ref, symbol_scope, NULL, type_class, flags, skip_map);
       if ((*ref == NULL || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK)
 	  && !(GLRO(dl_debug_mask) & DL_DEBUG_UNUSED))
 	{
Index: glibc-2.31/elf/dl-support.c
===================================================================
--- glibc-2.31.orig/elf/dl-support.c
+++ glibc-2.31/elf/dl-support.c
@@ -49,6 +49,7 @@ int _dl_debug_mask;
 int _dl_lazy;
 ElfW(Addr) _dl_use_load_bias = -2;
 int _dl_dynamic_weak;
+int _dl_version_fixup;
 
 /* If nonzero print warnings about problematic situations.  */
 int _dl_verbose;
@@ -334,6 +335,8 @@ _dl_non_dynamic_init (void)
 
   _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0';
 
+  _dl_version_fixup = *(getenv ("LD_VERSION_FIXUP") ?: "") != '\0';
+
   _dl_profile_output = getenv ("LD_PROFILE_OUTPUT");
   if (_dl_profile_output == NULL || _dl_profile_output[0] == '\0')
     _dl_profile_output
Index: glibc-2.31/sysdeps/generic/unsecvars.h
===================================================================
--- glibc-2.31.orig/sysdeps/generic/unsecvars.h
+++ glibc-2.31/sysdeps/generic/unsecvars.h
@@ -16,6 +16,7 @@
   "LD_DEBUG\0"								      \
   "LD_DEBUG_OUTPUT\0"							      \
   "LD_DYNAMIC_WEAK\0"							      \
+  "LD_VERSION_FIXUP\0"							      \
   "LD_HWCAP_MASK\0"							      \
   "LD_LIBRARY_PATH\0"							      \
   "LD_ORIGIN_PATH\0"							      \
Index: glibc-2.31/sysdeps/generic/ldsodefs.h
===================================================================
--- glibc-2.31.orig/sysdeps/generic/ldsodefs.h
+++ glibc-2.31/sysdeps/generic/ldsodefs.h
@@ -546,6 +546,9 @@ struct rtld_global_ro
      linking.  */
   EXTERN int _dl_dynamic_weak;
 
+  /* Nonzero if failing versioned lookups should be tried as non-versioned. */
+  EXTERN int _dl_version_fixup;
+
   /* Default floating-point control word.  */
   EXTERN fpu_control_t _dl_fpu_control;
 
Index: glibc-2.31/elf/rtld.c
===================================================================
--- glibc-2.31.orig/elf/rtld.c
+++ glibc-2.31/elf/rtld.c
@@ -2657,6 +2657,10 @@ process_envvars (enum mode *modep)
 	      GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0;
 	      break;
 	    }
+
+	  if (!__libc_enable_secure
+	      && memcmp (envline, "VERSION_FIXUP", 13) == 0)
+	    GLRO(dl_version_fixup) = 1;
 	  break;
 
 	case 14:

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File dl-lookup-ignore-spurious-version.patch of Package glibc

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