Read the shared library cache relative to $ORIGIN instead of reading from /etc/ld.so.cache. Also arrange so that this cache takes precedence over RUNPATH. diff --git a/elf/dl-cache.c b/elf/dl-cache.c index 93d185e788..e0760a1f40 100644 --- a/elf/dl-cache.c +++ b/elf/dl-cache.c @@ -171,6 +171,52 @@ _dl_cache_libcmp (const char *p1, const char *p2) return *p1 - *p2; } +/* Special value representing the lack of an ld.so cache. */ +static const char ld_so_cache_lacking[] = "/ld.so cache is lacking"; + +/* Return the per-application ld.so cache, relative to $ORIGIN, or NULL if + that fails for some reason. Do not return the system-wide LD_SO_CACHE + since on a foreign distro it would contain invalid information. */ +static const char * +ld_so_cache (void) +{ + static const char *loader_cache; + + if (loader_cache == NULL) + { + static const char store[] = @STORE_DIRECTORY@; + const char *origin = _dl_get_origin (); + + /* Check whether ORIGIN is something like "/gnu/store/…-foo/bin". */ + if (origin != (char *) -1 /* _dl_get_origin reported failure */ + && strncmp (store, origin, strlen (store)) == 0 + && origin[sizeof store - 1] == '/') + { + char *store_item_end = strchr (origin + sizeof store, '/'); + + if (store_item_end != NULL) + { + static const char suffix[] = "/etc/ld.so.cache"; + size_t store_item_len = store_item_end - origin; + + /* Note: We can't use 'malloc' because it can be interposed. + Likewise, 'strncpy' is not available. */ + char *cache = alloca (strlen (origin) + sizeof suffix); + + strcpy (cache, origin); + strcpy (cache + store_item_len, suffix); + + loader_cache = __strdup (cache) ?: ld_so_cache_lacking; + } + else + loader_cache = ld_so_cache_lacking; + } + else + loader_cache = ld_so_cache_lacking; + } + + return loader_cache; +} /* Look up NAME in ld.so.cache and return the file name stored there, or null if none is found. The cache is loaded if it was not already. If loading @@ -190,12 +235,15 @@ _dl_load_cache_lookup (const char *name) /* Print a message if the loading of libs is traced. */ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS)) - _dl_debug_printf (" search cache=%s\n", LD_SO_CACHE); + _dl_debug_printf (" search cache=%s\n", ld_so_cache ()); + + if (__glibc_unlikely (ld_so_cache () == ld_so_cache_lacking)) + return NULL; if (cache == NULL) { /* Read the contents of the file. */ - void *file = _dl_sysdep_read_whole_file (LD_SO_CACHE, &cachesize, + void *file = _dl_sysdep_read_whole_file (ld_so_cache (), &cachesize, PROT_READ); /* We can handle three different cache file formats here: diff --git a/elf/dl-load.c b/elf/dl-load.c index f3201e7c14..a69aec3428 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -2152,28 +2152,6 @@ _dl_map_object (struct link_map *loader, const char *name, loader ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded, LA_SER_LIBPATH, &found_other_class); - /* Look at the RUNPATH information for this binary. */ - if (fd == -1 && loader != NULL - && cache_rpath (loader, &loader->l_runpath_dirs, - DT_RUNPATH, "RUNPATH")) - fd = open_path (name, namelen, mode, - &loader->l_runpath_dirs, &realname, &fb, loader, - LA_SER_RUNPATH, &found_other_class); - - if (fd == -1) - { - realname = _dl_sysdep_open_object (name, namelen, &fd); - if (realname != NULL) - { - fd = open_verify (realname, fd, - &fb, loader ?: GL(dl_ns)[nsid]._ns_loaded, - LA_SER_CONFIG, mode, &found_other_class, - false); - if (fd == -1) - free (realname); - } - } - #ifdef USE_LDCONFIG if (fd == -1 && (__glibc_likely ((mode & __RTLD_SECURE) == 0) @@ -2232,6 +2210,28 @@ _dl_map_object (struct link_map *loader, const char *name, } #endif + /* Look at the RUNPATH information for this binary. */ + if (fd == -1 && loader != NULL + && cache_rpath (loader, &loader->l_runpath_dirs, + DT_RUNPATH, "RUNPATH")) + fd = open_path (name, namelen, mode, + &loader->l_runpath_dirs, &realname, &fb, loader, + LA_SER_RUNPATH, &found_other_class); + + if (fd == -1) + { + realname = _dl_sysdep_open_object (name, namelen, &fd); + if (realname != NULL) + { + fd = open_verify (realname, fd, + &fb, loader ?: GL(dl_ns)[nsid]._ns_loaded, + LA_SER_CONFIG, mode, &found_other_class, + false); + if (fd == -1) + free (realname); + } + } + /* Finally, try the default path. */ if (fd == -1 && ((l = loader ?: GL(dl_ns)[nsid]._ns_loaded) == NULL .scm (js-mathjax-for-r-mathjaxr): New variable. Ricardo Wurmus 2022-06-05gnu: rhino: Remove build timestamps....* gnu/packages/javascript.scm (rhino)[arguments]: Add 'remove-build-dates phase. Vagrant Cascadian 2022-05-09gnu: mujs: Use G-expressions....* gnu/packages/javascript.scm (mujs)[arguments]: Rewrite using G-expressions. Efraim Flashner 2022-05-09gnu: mujs: Update to 1.2.0....* gnu/packages/javascript.scm (mujs): Update to 1.2.0. [source]: Add snippet to remove generated files. Efraim Flashner