diff options
Diffstat (limited to 'gnu/packages/patches/glibc-dl-cache.patch')
| -rw-r--r-- | gnu/packages/patches/glibc-dl-cache.patch | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/gnu/packages/patches/glibc-dl-cache.patch b/gnu/packages/patches/glibc-dl-cache.patch new file mode 100644 index 0000000000..68c3a94846 --- /dev/null +++ b/gnu/packages/patches/glibc-dl-cache.patch @@ -0,0 +1,140 @@ +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 +171,51 @@ _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 (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 |