diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 3 | ||||
| -rw-r--r-- | elf/dl-load.c | 36 | ||||
| -rw-r--r-- | elf/tst-dlopen-aout.c | 61 |
3 files changed, 87 insertions, 13 deletions
diff --git a/elf/Makefile b/elf/Makefile index df138fc2d8..d96cd40743 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -148,7 +148,7 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \ tst-stackguard1 tst-addr1 tst-thrlock \ tst-unique1 tst-unique2 tst-unique3 tst-unique4 \ tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \ - tst-ptrguard1 + tst-ptrguard1 tst-dlopen-aout # reldep9 test-srcs = tst-pathopt selinux-enabled := $(shell cat /selinux/enforce 2> /dev/null) @@ -1056,6 +1056,7 @@ tst-leaks1-static-ENV = MALLOC_TRACE=$(objpfx)tst-leaks1-static.mtrace $(objpfx)tst-addr1: $(libdl) $(objpfx)tst-thrlock: $(libdl) $(shared-thread-library) +$(objpfx)tst-dlopen-aout: $(libdl) $(shared-thread-library) CFLAGS-ifuncmain1pic.c += $(pic-ccflag) CFLAGS-ifuncmain1picstatic.c += $(pic-ccflag) diff --git a/elf/dl-load.c b/elf/dl-load.c index 8ebc1285ea..9455df291f 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1667,7 +1667,7 @@ print_search_path (struct r_search_path_elem **list, user might want to know about this. */ static int open_verify (const char *name, struct filebuf *fbp, struct link_map *loader, - int whatcode, bool *found_other_class, bool free_name) + int whatcode, int mode, bool *found_other_class, bool free_name) { /* This is the expected ELF header. */ #define ELF32_CLASS ELFCLASS32 @@ -1843,6 +1843,17 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader, errstring = N_("only ET_DYN and ET_EXEC can be loaded"); goto call_lose; } + else if (__glibc_unlikely (ehdr->e_type == ET_EXEC + && (mode & __RTLD_OPENEXEC) == 0)) + { + /* BZ #16634. It is an error to dlopen ET_EXEC (unless + __RTLD_OPENEXEC is explicitly set). We return error here + so that code in _dl_map_object_from_fd does not try to set + l_tls_modid for this module. */ + + errstring = N_("cannot dynamically load executable"); + goto call_lose; + } else if (__builtin_expect (ehdr->e_phentsize, sizeof (ElfW(Phdr))) != sizeof (ElfW(Phdr))) { @@ -1928,7 +1939,7 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader, if MAY_FREE_DIRS is true. */ static int -open_path (const char *name, size_t namelen, int secure, +open_path (const char *name, size_t namelen, int mode, struct r_search_path_struct *sps, char **realname, struct filebuf *fbp, struct link_map *loader, int whatcode, bool *found_other_class) @@ -1980,8 +1991,8 @@ open_path (const char *name, size_t namelen, int secure, if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS)) _dl_debug_printf (" trying file=%s\n", buf); - fd = open_verify (buf, fbp, loader, whatcode, found_other_class, - false); + fd = open_verify (buf, fbp, loader, whatcode, mode, + found_other_class, false); if (this_dir->status[cnt] == unknown) { if (fd != -1) @@ -2010,7 +2021,7 @@ open_path (const char *name, size_t namelen, int secure, /* Remember whether we found any existing directory. */ here_any |= this_dir->status[cnt] != nonexisting; - if (fd != -1 && __builtin_expect (secure, 0) + if (fd != -1 && __builtin_expect (mode & __RTLD_SECURE, 0) && INTUSE(__libc_enable_secure)) { /* This is an extra security effort to make sure nobody can @@ -2184,7 +2195,7 @@ _dl_map_object (struct link_map *loader, const char *name, for (l = loader; l; l = l->l_loader) if (cache_rpath (l, &l->l_rpath_dirs, DT_RPATH, "RPATH")) { - fd = open_path (name, namelen, mode & __RTLD_SECURE, + fd = open_path (name, namelen, mode, &l->l_rpath_dirs, &realname, &fb, loader, LA_SER_RUNPATH, &found_other_class); @@ -2200,7 +2211,7 @@ _dl_map_object (struct link_map *loader, const char *name, && main_map != NULL && main_map->l_type != lt_loaded && cache_rpath (main_map, &main_map->l_rpath_dirs, DT_RPATH, "RPATH")) - fd = open_path (name, namelen, mode & __RTLD_SECURE, + fd = open_path (name, namelen, mode, &main_map->l_rpath_dirs, &realname, &fb, loader ?: main_map, LA_SER_RUNPATH, &found_other_class); @@ -2208,7 +2219,7 @@ _dl_map_object (struct link_map *loader, const char *name, /* Try the LD_LIBRARY_PATH environment variable. */ if (fd == -1 && env_path_list.dirs != (void *) -1) - fd = open_path (name, namelen, mode & __RTLD_SECURE, &env_path_list, + fd = open_path (name, namelen, mode, &env_path_list, &realname, &fb, loader ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded, LA_SER_LIBPATH, &found_other_class); @@ -2217,7 +2228,7 @@ _dl_map_object (struct link_map *loader, const char *name, if (fd == -1 && loader != NULL && cache_rpath (loader, &loader->l_runpath_dirs, DT_RUNPATH, "RUNPATH")) - fd = open_path (name, namelen, mode & __RTLD_SECURE, + fd = open_path (name, namelen, mode, &loader->l_runpath_dirs, &realname, &fb, loader, LA_SER_RUNPATH, &found_other_class); @@ -2267,7 +2278,8 @@ _dl_map_object (struct link_map *loader, const char *name, { fd = open_verify (cached, &fb, loader ?: GL(dl_ns)[nsid]._ns_loaded, - LA_SER_CONFIG, &found_other_class, false); + LA_SER_CONFIG, mode, &found_other_class, + false); if (__glibc_likely (fd != -1)) { realname = local_strdup (cached); @@ -2287,7 +2299,7 @@ _dl_map_object (struct link_map *loader, const char *name, && ((l = loader ?: GL(dl_ns)[nsid]._ns_loaded) == NULL || __builtin_expect (!(l->l_flags_1 & DF_1_NODEFLIB), 1)) && rtld_search_dirs.dirs != (void *) -1) - fd = open_path (name, namelen, mode & __RTLD_SECURE, &rtld_search_dirs, + fd = open_path (name, namelen, mode, &rtld_search_dirs, &realname, &fb, l, LA_SER_DEFAULT, &found_other_class); /* Add another newline when we are tracing the library loading. */ @@ -2305,7 +2317,7 @@ _dl_map_object (struct link_map *loader, const char *name, else { fd = open_verify (realname, &fb, - loader ?: GL(dl_ns)[nsid]._ns_loaded, 0, + loader ?: GL(dl_ns)[nsid]._ns_loaded, 0, mode, &found_other_class, true); if (__builtin_expect (fd, 0) == -1) free (realname); diff --git a/elf/tst-dlopen-aout.c b/elf/tst-dlopen-aout.c new file mode 100644 index 0000000000..d3534250e0 --- /dev/null +++ b/elf/tst-dlopen-aout.c @@ -0,0 +1,61 @@ +/* Test case for BZ #16634. + + Copyright (C) 2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. + + Note: this test currently only fails when glibc is configured with + --enable-hardcoded-path-in-tests. */ + +#include <assert.h> +#include <dlfcn.h> +#include <stdio.h> +#include <pthread.h> + +__thread int x; + +void * +fn (void *p) +{ + return p; +} + +int +main (int argc, char *argv[]) +{ + int j; + + for (j = 0; j < 100; ++j) + { + pthread_t thr; + void *p; + int rc; + + p = dlopen (argv[0], RTLD_LAZY); + if (p != NULL) + { + fprintf (stderr, "dlopen unexpectedly succeeded\n"); + return 1; + } + rc = pthread_create (&thr, NULL, fn, NULL); + assert (rc == 0); + + rc = pthread_join (thr, NULL); + assert (rc == 0); + } + + return 0; +} |