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| author | Florian Weimer <fweimer@redhat.com> | 2021-03-15 10:33:43 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-03-15 14:43:13 +0100 |
| commit | 4e6db99c665d3b82a70a3e218860ef087b1555b4 (patch) | |
| tree | 45764ae3d3a84cb15e2a2efcf28ff0779c2acd86 /elf | |
| parent | f53ffc9b90cbd92fa5518686daf4091bdd1d4889 (diff) | |
| download | glibc-4e6db99c665d3b82a70a3e218860ef087b1555b4.tar.gz glibc-4e6db99c665d3b82a70a3e218860ef087b1555b4.tar.xz glibc-4e6db99c665d3b82a70a3e218860ef087b1555b4.zip | |
elf: ld.so --help calls _dl_init_paths without a main map [BZ #27577]
In this case, use the link map of the dynamic loader itself as
a replacement. This is more than just a hack: if we ever support
DT_RUNPATH/DT_RPATH for the dynamic loader, reporting it for
ld.so --help (without further command line arguments) would be the
right thing to do.
Fixes commit 332421312576bd7095e70589154af99b124dd2d1 ("elf: Always
set l in _dl_init_paths (bug 23462)").
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 18 | ||||
| -rw-r--r-- | elf/dl-load.c | 8 |
2 files changed, 23 insertions, 3 deletions
diff --git a/elf/Makefile b/elf/Makefile index 4c9e63dac9..ba4689a7fa 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -245,7 +245,7 @@ tests += $(tests-execstack-$(have-z-execstack)) ifeq ($(run-built-tests),yes) tests-special += $(objpfx)tst-leaks1-mem.out \ $(objpfx)tst-leaks1-static-mem.out $(objpfx)noload-mem.out \ - $(objpfx)tst-ldconfig-X.out + $(objpfx)tst-ldconfig-X.out $(objpfx)tst-rtld-help.out endif tlsmod17a-suffixes = 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 tlsmod18a-suffixes = 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 @@ -433,7 +433,8 @@ endif ifeq (yes,$(build-shared)) ifeq ($(run-built-tests),yes) tests-special += $(objpfx)tst-pathopt.out $(objpfx)tst-rtld-load-self.out \ - $(objpfx)tst-rtld-preload.out $(objpfx)argv0test.out + $(objpfx)tst-rtld-preload.out $(objpfx)argv0test.out \ + $(objpfx)tst-rtld-help.out endif tests-special += $(objpfx)check-textrel.out $(objpfx)check-execstack.out \ $(objpfx)check-wx-segment.out \ @@ -1907,3 +1908,16 @@ $(objpfx)list-tunables.out: tst-rtld-list-tunables.sh $(objpfx)ld.so $(evaluate-test) tst-dst-static-ENV = LD_LIBRARY_PATH='$$ORIGIN' + +$(objpfx)tst-rtld-help.out: $(objpfx)ld.so + $(test-wrapper) $(rtld-prefix) --help > $@; \ + status=$$?; \ + echo "info: ld.so exit status: $$status" >> $@; \ + if ! grep -q 'Legacy HWCAP subdirectories under library search path directories' $@; then \ + echo "error: missing subdirectory pattern" >> $@; \ + if test $$status -eq 0; then \ + status=1; \ + fi; \ + fi; \ + (exit $$status); \ + $(evaluate-test) diff --git a/elf/dl-load.c b/elf/dl-load.c index 376a2e64d6..2f760503c5 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -758,8 +758,14 @@ _dl_init_paths (const char *llp, const char *source, max_dirnamelen = SYSTEM_DIRS_MAX_LEN; *aelem = NULL; - /* This points to the map of the main object. */ + /* This points to the map of the main object. If there is no main + object (e.g., under --help, use the dynamic loader itself as a + stand-in. */ l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; +#ifdef SHARED + if (l == NULL) + l = &GL (dl_rtld_map); +#endif assert (l->l_type != lt_loaded); if (l->l_info[DT_RUNPATH]) |