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From 4e6db99c665d3b82a70a3e218860ef087b1555b4 Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Mon, 15 Mar 2021 10:33:43 +0100
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Subject: elf: ld.so --help calls _dl_init_paths without a main map [BZ #27577]
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In this case, use the link map of the dynamic loader itself as
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a replacement. This is more than just a hack: if we ever support
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DT_RUNPATH/DT_RPATH for the dynamic loader, reporting it for
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ld.so --help (without further command line arguments) would be the
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right thing to do.
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Fixes commit 332421312576bd7095e70589154af99b124dd2d1 ("elf: Always
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set l in _dl_init_paths (bug 23462)").
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diff --git a/elf/Makefile b/elf/Makefile
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index 4c9e63dac9..ba4689a7fa 100644
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--- a/elf/Makefile
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+++ b/elf/Makefile
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@@ -231,7 +231,7 @@ tests += $(tests-execstack-$(have-z-execstack))
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ifeq ($(run-built-tests),yes)
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tests-special += $(objpfx)tst-leaks1-mem.out \
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$(objpfx)tst-leaks1-static-mem.out $(objpfx)noload-mem.out \
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- $(objpfx)tst-ldconfig-X.out
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+ $(objpfx)tst-ldconfig-X.out $(objpfx)tst-rtld-help.out
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endif
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tlsmod17a-suffixes = 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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tlsmod18a-suffixes = 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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@@ -409,7 +409,8 @@ endif
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ifeq (yes,$(build-shared))
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ifeq ($(run-built-tests),yes)
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tests-special += $(objpfx)tst-pathopt.out $(objpfx)tst-rtld-load-self.out \
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- $(objpfx)tst-rtld-preload.out $(objpfx)argv0test.out
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+ $(objpfx)tst-rtld-preload.out $(objpfx)argv0test.out \
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+ $(objpfx)tst-rtld-help.out
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endif
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tests-special += $(objpfx)check-textrel.out $(objpfx)check-execstack.out \
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$(objpfx)check-wx-segment.out \
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@@ -1814,3 +1815,16 @@ $(objpfx)list-tunables.out: tst-rtld-list-tunables.sh $(objpfx)ld.so
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$(objpfx)tst-glibc-hwcaps-cache.out: $(objpfx)tst-glibc-hwcaps
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tst-dst-static-ENV = LD_LIBRARY_PATH='$$ORIGIN'
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+
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+$(objpfx)tst-rtld-help.out: $(objpfx)ld.so
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+ $(test-wrapper) $(rtld-prefix) --help > $@; \
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+ status=$$?; \
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+ echo "info: ld.so exit status: $$status" >> $@; \
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+ if ! grep -q 'Legacy HWCAP subdirectories under library search path directories' $@; then \
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+ echo "error: missing subdirectory pattern" >> $@; \
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+ if test $$status -eq 0; then \
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+ status=1; \
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+ fi; \
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+ fi; \
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+ (exit $$status); \
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+ $(evaluate-test)
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diff --git a/elf/dl-load.c b/elf/dl-load.c
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index 376a2e64d6..2f760503c5 100644
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--- a/elf/dl-load.c
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+++ b/elf/dl-load.c
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@@ -758,8 +758,14 @@ _dl_init_paths (const char *llp, const char *source,
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max_dirnamelen = SYSTEM_DIRS_MAX_LEN;
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*aelem = NULL;
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- /* This points to the map of the main object. */
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+ /* This points to the map of the main object. If there is no main
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+ object (e.g., under --help, use the dynamic loader itself as a
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+ stand-in. */
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l = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
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+#ifdef SHARED
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+ if (l == NULL)
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+ l = &GL (dl_rtld_map);
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+#endif
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assert (l->l_type != lt_loaded);
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if (l->l_info[DT_RUNPATH])
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