diff options
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/elf/rtld.c b/elf/rtld.c index 2daf05a6d6..b912124fca 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -1077,6 +1077,49 @@ of this helper program; chances are you did not intend to run this program.\n\ ++GL(dl_nloaded); ++GL(dl_load_adds); +#if defined(__i386__) + /* Force non-TLS libraries for glibc 2.0 binaries + or if a buggy binary references non-TLS errno or h_errno. */ + if (__builtin_expect (GL(dl_loaded)->l_info[DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)] == NULL, 0) + && GL(dl_loaded)->l_info[DT_DEBUG]) + GLRO(dl_osversion) = 0x20205; + else if ((__builtin_expect (mode, normal) != normal + || GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)] == NULL) + /* Only binaries have DT_DEBUG dynamic tags... */ + && GL(dl_loaded)->l_info[DT_DEBUG]) + { + /* Workaround for buggy binaries. This doesn't handle buggy + libraries. */ + bool buggy = false; + const ElfW(Sym) *symtab = (const void *) D_PTR (GL(dl_loaded), l_info[DT_SYMTAB]); + const char *strtab = (const void *) D_PTR (GL(dl_loaded), l_info[DT_STRTAB]); + Elf_Symndx symidx; + for (symidx = GL(dl_loaded)->l_buckets[0x6c994f % GL(dl_loaded)->l_nbuckets]; + symidx != STN_UNDEF; + symidx = GL(dl_loaded)->l_chain[symidx]) + { + if (__builtin_expect (strcmp (strtab + symtab[symidx].st_name, + "errno") == 0, 0) + && ELFW(ST_TYPE) (symtab[symidx].st_info) != STT_TLS) + buggy = true; + } + for (symidx = GL(dl_loaded)->l_buckets[0xe5c992f % GL(dl_loaded)->l_nbuckets]; + symidx != STN_UNDEF; + symidx = GL(dl_loaded)->l_chain[symidx]) + { + if (__builtin_expect (strcmp (strtab + symtab[symidx].st_name, + "h_errno") == 0, 0) + && ELFW(ST_TYPE) (symtab[symidx].st_info) != STT_TLS) + buggy = true; + } + if (__builtin_expect (buggy, false) && GLRO(dl_osversion) > 0x20401) + { + GLRO(dl_osversion) = 0x20401; + _dl_error_printf ("Incorrectly built binary which accesses errno or h_errno directly. Needs to be fixed.\n"); + } + } +#endif + /* If LD_USE_LOAD_BIAS env variable has not been seen, default to not using bias for non-prelinked PIEs and libraries and using it for executables or prelinked PIEs or libraries. */ @@ -1247,6 +1290,64 @@ ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n", } } + +#if defined(__i386__) || defined(__alpha__) || (defined(__sparc__) && !defined(__arch64__)) + /* + * Modifications by Red Hat Software + * + * Deal with the broken binaries from the non-versioned ages of glibc. + * If a binary does not have version information enabled, we assume that + * it is a glibc 2.0 binary and we load a compatibility library to try to + * overcome binary incompatibilities. + * Blame: gafton@redhat.com + */ +#define LIB_NOVERSION "/lib/libNoVersion.so.1" + + if (__builtin_expect (GL(dl_loaded)->l_info[DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)] == NULL, 0) + && (GL(dl_loaded)->l_info[DT_DEBUG] || !(GLRO(dl_debug_mask) & DL_DEBUG_PRELINK))) + { + struct stat test_st; + int test_fd; + int can_load; + + HP_TIMING_NOW (start); + +/* _dl_sysdep_message("Loading compatibility library... ", NULL); */ + + can_load = 1; + test_fd = __open (LIB_NOVERSION, O_RDONLY); + if (test_fd < 0) { + can_load = 0; +/* _dl_sysdep_message(" Can't find " LIB_NOVERSION "\n", NULL); */ + } else { + if (__fxstat (_STAT_VER, test_fd, &test_st) < 0 || test_st.st_size == 0) { + can_load = 0; +/* _dl_sysdep_message(" Can't stat " LIB_NOVERSION "\n", NULL); */ + } + } + + if (test_fd >= 0) /* open did no fail.. */ + __close(test_fd); /* avoid fd leaks */ + + if (can_load != 0) { + struct link_map *new_map; + new_map = _dl_map_object (GL(dl_loaded), LIB_NOVERSION, + 1, lt_library, 0, 0); + if (++new_map->l_opencount == 1) { + /* It is no duplicate. */ + ++npreloads; +/* _dl_sysdep_message(" DONE\n", NULL); */ + } else { +/* _dl_sysdep_message(" FAILED\n", NULL); */ + } + } + + HP_TIMING_NOW (stop); + HP_TIMING_DIFF (diff, start, stop); + HP_TIMING_ACCUM_NT (load_time, diff); + } +#endif + if (__builtin_expect (npreloads, 0) != 0) { /* Set up PRELOADS with a vector of the preloaded libraries. */ |