diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 6 | ||||
| -rw-r--r-- | elf/dl-libc.c | 8 | ||||
| -rw-r--r-- | elf/tst-audit26.c | 35 | ||||
| -rw-r--r-- | elf/tst-auditmod26.c | 104 |
4 files changed, 149 insertions, 4 deletions
diff --git a/elf/Makefile b/elf/Makefile index 8ed6c3b0b1..e4907d5de9 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -390,6 +390,7 @@ tests += \ tst-audit24d \ tst-audit25a \ tst-audit25b \ + tst-audit26 \ tst-auditmany \ tst-auxobj \ tst-auxobj-dlopen \ @@ -767,6 +768,7 @@ modules-names = \ tst-auditmod24c \ tst-auditmod24d \ tst-auditmod25 \ + tst-auditmod26 \ tst-auxvalmod \ tst-big-note-lib \ tst-deep1mod1 \ @@ -2286,6 +2288,10 @@ $(objpfx)tst-audit25b: $(objpfx)tst-audit25mod1.so \ LDFLAGS-tst-audit25b = -Wl,-z,now tst-audit25b-ARGS = -- $(host-test-program-cmd) +$(objpfx)tst-audit26.out: $(objpfx)tst-auditmod26.so +$(objpfx)tst-auditmod26.so: $(libsupport) +tst-audit26-ENV = LD_AUDIT=$(objpfx)tst-auditmod26.so + # tst-sonamemove links against an older implementation of the library. LDFLAGS-tst-sonamemove-linkmod1.so = \ -Wl,--version-script=tst-sonamemove-linkmod1.map \ diff --git a/elf/dl-libc.c b/elf/dl-libc.c index a7180d0af8..266e068da6 100644 --- a/elf/dl-libc.c +++ b/elf/dl-libc.c @@ -156,7 +156,7 @@ __libc_dlopen_mode (const char *name, int mode) args.caller_dlopen = RETURN_ADDRESS (0); #ifdef SHARED - if (!rtld_active ()) + if (GLRO (dl_dlfcn_hook) != NULL) return GLRO (dl_dlfcn_hook)->libc_dlopen_mode (name, mode); #endif return dlerror_run (do_dlopen, &args) ? NULL : (void *) args.map; @@ -184,7 +184,7 @@ __libc_dlsym (void *map, const char *name) args.name = name; #ifdef SHARED - if (!rtld_active ()) + if (GLRO (dl_dlfcn_hook) != NULL) return GLRO (dl_dlfcn_hook)->libc_dlsym (map, name); #endif return (dlerror_run (do_dlsym, &args) ? NULL @@ -198,7 +198,7 @@ void * __libc_dlvsym (void *map, const char *name, const char *version) { #ifdef SHARED - if (!rtld_active ()) + if (GLRO (dl_dlfcn_hook) != NULL) return GLRO (dl_dlfcn_hook)->libc_dlvsym (map, name, version); #endif @@ -221,7 +221,7 @@ int __libc_dlclose (void *map) { #ifdef SHARED - if (!rtld_active ()) + if (GLRO (dl_dlfcn_hook) != NULL) return GLRO (dl_dlfcn_hook)->libc_dlclose (map); #endif return dlerror_run (do_dlclose, map); diff --git a/elf/tst-audit26.c b/elf/tst-audit26.c new file mode 100644 index 0000000000..3f920e83ba --- /dev/null +++ b/elf/tst-audit26.c @@ -0,0 +1,35 @@ +/* Check the usability of <dlfcn.h> functions in audit modules. + Copyright (C) 2022 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 + <https://www.gnu.org/licenses/>. */ + +#include <gnu/lib-names.h> + +#include <support/check.h> +#include <support/xdlfcn.h> + +static int +do_test (void) +{ + /* Check that the audit module has been loaded. */ + void *handle = xdlopen ("mapped to libc", RTLD_LOCAL | RTLD_NOW); + TEST_VERIFY (handle + == xdlopen (LIBC_SO, RTLD_LOCAL | RTLD_NOW | RTLD_NOLOAD)); + + return 0; +} + +#include <support/test-driver.c> diff --git a/elf/tst-auditmod26.c b/elf/tst-auditmod26.c new file mode 100644 index 0000000000..db7ba95abe --- /dev/null +++ b/elf/tst-auditmod26.c @@ -0,0 +1,104 @@ +/* Check the usability of <dlfcn.h> functions in audit modules. Audit module. + Copyright (C) 2022 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 + <https://www.gnu.org/licenses/>. */ + +#include <dlfcn.h> +#include <first-versions.h> +#include <gnu/lib-names.h> +#include <link.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include <support/check.h> +#include <support/xdlfcn.h> + +unsigned int +la_version (unsigned int current) +{ + /* Exercise various <dlfcn.h> functions. */ + + /* Check dlopen, dlsym, dlclose. */ + void *handle = xdlopen (LIBM_SO, RTLD_LOCAL | RTLD_NOW); + void *ptr = xdlsym (handle, "sincos"); + TEST_VERIFY (ptr != NULL); + ptr = dlsym (handle, "SINCOS"); + TEST_VERIFY (ptr == NULL); + const char *message = dlerror (); + TEST_VERIFY (strstr (message, ": undefined symbol: SINCOS") != NULL); + ptr = dlsym (handle, "SINCOS"); + TEST_VERIFY (ptr == NULL); + xdlclose (handle); + TEST_COMPARE_STRING (dlerror (), NULL); + + handle = xdlopen (LIBC_SO, RTLD_LOCAL | RTLD_NOW | RTLD_NOLOAD); + + /* Check dlvsym. _exit is unlikely to gain another symbol + version. */ + TEST_VERIFY (xdlsym (handle, "_exit") + == xdlvsym (handle, "_exit", FIRST_VERSION_libc__exit_STRING)); + + /* Check dlinfo. */ + { + void *handle2 = NULL; + TEST_COMPARE (dlinfo (handle, RTLD_DI_LINKMAP, &handle2), 0); + TEST_VERIFY (handle2 == handle); + } + + /* Check dladdr and dladdr1. */ + Dl_info info = { }; + TEST_VERIFY (dladdr (&_exit, &info) != 0); + if (strcmp (info.dli_sname, "_Exit") != 0) /* _Exit is an alias. */ + TEST_COMPARE_STRING (info.dli_sname, "_exit"); + TEST_VERIFY (info.dli_saddr == &_exit); + TEST_VERIFY (strstr (info.dli_fname, LIBC_SO)); + void *extra_info; + memset (&info, 0, sizeof (info)); + TEST_VERIFY (dladdr1 (&_exit, &info, &extra_info, RTLD_DL_LINKMAP) != 0); + TEST_VERIFY (extra_info == handle); + + /* Verify that dlmopen creates a new namespace. */ + void *dlmopen_handle = xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW); + TEST_VERIFY (dlmopen_handle != handle); + memset (&info, 0, sizeof (info)); + extra_info = NULL; + ptr = xdlsym (dlmopen_handle, "_exit"); + TEST_VERIFY (dladdr1 (ptr, &info, &extra_info, RTLD_DL_LINKMAP) != 0); + TEST_VERIFY (extra_info == dlmopen_handle); + xdlclose (dlmopen_handle); + + /* Terminate the process with an error state. This does not happen + automatically because the audit module state is not shared with + the main program. */ + if (support_record_failure_is_failed ()) + { + fflush (stdout); + fflush (stderr); + _exit (1); + } + + return LAV_CURRENT; +} + +char * +la_objsearch (const char *name, uintptr_t *cookie, unsigned int flag) +{ + if (strcmp (name, "mapped to libc") == 0) + return (char *) LIBC_SO; + else + return (char *) name; +} |