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elf: Allow dlopen of filter object to work [BZ #16272]
There are two fixes that are needed to be able to dlopen filter objects. First _dl_map_object_deps cannot assume that map will be at the beginning of l_searchlist.r_list[], as filtees are inserted before map. Secondly dl_open_worker needs to ensure that filtees get relocated. In _dl_map_object_deps: * avoiding removing relocation dependencies of map by setting l_reserved to 0 and otherwise processing the rest of the search list. * ensure that map remains at the beginning of l_initfini - the list of things that need initialisation (and destruction). Do this by splitting the copy up. This may not be required, but matches the initialization order without dlopen. Modify dl_open_worker to relocate the objects in new->l_inifini. new->l_initfini is constructed in _dl_map_object_deps, and lists the objects that need initialization and destruction. Originally the list of objects in new->l_next are relocated. All of these objects should also be included in new->l_initfini (both lists are populated with dependencies in _dl_map_object_deps). We can't use new->l_prev to pick up filtees, as during a recursive dlopen from an interposed malloc call, l->prev can contain objects that are not ready for relocation. Add tests to verify that symbols resolve to the filtee implementation when auxiliary and filter objects are used, both as a normal link and when dlopen'd. Tested by running the testsuite on x86_64.
This commit is contained in:
parent
6721b9d52e
commit
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18
elf/Makefile
18
elf/Makefile
@ -201,7 +201,8 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
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tst-unwind-ctor tst-unwind-main tst-audit13 \
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tst-unwind-ctor tst-unwind-main tst-audit13 \
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tst-sonamemove-link tst-sonamemove-dlopen tst-dlopen-tlsmodid \
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tst-sonamemove-link tst-sonamemove-dlopen tst-dlopen-tlsmodid \
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tst-dlopen-self tst-auditmany tst-initfinilazyfail tst-dlopenfail \
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tst-dlopen-self tst-auditmany tst-initfinilazyfail tst-dlopenfail \
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tst-dlopenfail-2
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tst-dlopenfail-2 \
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tst-filterobj tst-filterobj-dlopen tst-auxobj tst-auxobj-dlopen
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# reldep9
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# reldep9
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tests-internal += loadtest unload unload2 circleload1 \
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tests-internal += loadtest unload unload2 circleload1 \
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neededtest neededtest2 neededtest3 neededtest4 \
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neededtest neededtest2 neededtest3 neededtest4 \
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@ -312,7 +313,8 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
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tst-auditmanymod7 tst-auditmanymod8 tst-auditmanymod9 \
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tst-auditmanymod7 tst-auditmanymod8 tst-auditmanymod9 \
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tst-initlazyfailmod tst-finilazyfailmod \
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tst-initlazyfailmod tst-finilazyfailmod \
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tst-dlopenfailmod1 tst-dlopenfaillinkmod tst-dlopenfailmod2 \
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tst-dlopenfailmod1 tst-dlopenfaillinkmod tst-dlopenfailmod2 \
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tst-dlopenfailmod3 tst-ldconfig-ld-mod
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tst-dlopenfailmod3 tst-ldconfig-ld-mod \
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tst-filterobj-flt tst-filterobj-aux tst-filterobj-filtee
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# Most modules build with _ISOMAC defined, but those filtered out
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# Most modules build with _ISOMAC defined, but those filtered out
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# depend on internal headers.
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# depend on internal headers.
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modules-names-tests = $(filter-out ifuncmod% tst-libc_dlvsym-dso tst-tlsmod%,\
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modules-names-tests = $(filter-out ifuncmod% tst-libc_dlvsym-dso tst-tlsmod%,\
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@ -1699,3 +1701,15 @@ LDFLAGS-tst-dlopen-nodelete-reloc-mod17.so = -Wl,--no-as-needed
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$(objpfx)tst-ldconfig-ld_so_conf-update.out: $(objpfx)tst-ldconfig-ld-mod.so
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$(objpfx)tst-ldconfig-ld_so_conf-update.out: $(objpfx)tst-ldconfig-ld-mod.so
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$(objpfx)tst-ldconfig-ld_so_conf-update: $(libdl)
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$(objpfx)tst-ldconfig-ld_so_conf-update: $(libdl)
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LDFLAGS-tst-filterobj-flt.so = -Wl,--filter=$(objpfx)tst-filterobj-filtee.so
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$(objpfx)tst-filterobj: $(objpfx)tst-filterobj-flt.so
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$(objpfx)tst-filterobj-dlopen: $(libdl)
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$(objpfx)tst-filterobj.out: $(objpfx)tst-filterobj-filtee.so
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$(objpfx)tst-filterobj-dlopen.out: $(objpfx)tst-filterobj-filtee.so
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LDFLAGS-tst-filterobj-aux.so = -Wl,--auxiliary=$(objpfx)tst-filterobj-filtee.so
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$(objpfx)tst-auxobj: $(objpfx)tst-filterobj-aux.so
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$(objpfx)tst-auxobj-dlopen: $(libdl)
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$(objpfx)tst-auxobj.out: $(objpfx)tst-filterobj-filtee.so
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$(objpfx)tst-auxobj-dlopen.out: $(objpfx)tst-filterobj-filtee.so
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@ -485,14 +485,18 @@ _dl_map_object_deps (struct link_map *map,
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map->l_searchlist.r_list = &l_initfini[nlist + 1];
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map->l_searchlist.r_list = &l_initfini[nlist + 1];
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map->l_searchlist.r_nlist = nlist;
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map->l_searchlist.r_nlist = nlist;
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unsigned int map_index = UINT_MAX;
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for (nlist = 0, runp = known; runp; runp = runp->next)
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for (nlist = 0, runp = known; runp; runp = runp->next)
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{
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{
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if (__builtin_expect (trace_mode, 0) && runp->map->l_faked)
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if (__builtin_expect (trace_mode, 0) && runp->map->l_faked)
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/* This can happen when we trace the loading. */
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/* This can happen when we trace the loading. */
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--map->l_searchlist.r_nlist;
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--map->l_searchlist.r_nlist;
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else
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else {
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if (runp->map == map)
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map_index = nlist;
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map->l_searchlist.r_list[nlist++] = runp->map;
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map->l_searchlist.r_list[nlist++] = runp->map;
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}
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/* Now clear all the mark bits we set in the objects on the search list
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/* Now clear all the mark bits we set in the objects on the search list
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to avoid duplicates, so the next call starts fresh. */
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to avoid duplicates, so the next call starts fresh. */
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@ -550,13 +554,14 @@ Filters not supported with LD_TRACE_PRELINKING"));
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}
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}
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/* Maybe we can remove some relocation dependencies now. */
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/* Maybe we can remove some relocation dependencies now. */
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assert (map->l_searchlist.r_list[0] == map);
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struct link_map_reldeps *l_reldeps = NULL;
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struct link_map_reldeps *l_reldeps = NULL;
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if (map->l_reldeps != NULL)
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if (map->l_reldeps != NULL)
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{
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{
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for (i = 1; i < nlist; ++i)
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for (i = 0; i < nlist; ++i)
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map->l_searchlist.r_list[i]->l_reserved = 1;
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map->l_searchlist.r_list[i]->l_reserved = 1;
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/* Avoid removing relocation dependencies of the main binary. */
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map->l_reserved = 0;
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struct link_map **list = &map->l_reldeps->list[0];
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struct link_map **list = &map->l_reldeps->list[0];
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for (i = 0; i < map->l_reldeps->act; ++i)
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for (i = 0; i < map->l_reldeps->act; ++i)
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if (list[i]->l_reserved)
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if (list[i]->l_reserved)
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@ -581,16 +586,30 @@ Filters not supported with LD_TRACE_PRELINKING"));
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}
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}
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}
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}
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for (i = 1; i < nlist; ++i)
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for (i = 0; i < nlist; ++i)
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map->l_searchlist.r_list[i]->l_reserved = 0;
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map->l_searchlist.r_list[i]->l_reserved = 0;
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}
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}
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/* Sort the initializer list to take dependencies into account. The binary
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/* Sort the initializer list to take dependencies into account. Always
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itself will always be initialize last. */
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initialize the binary itself last. */
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memcpy (l_initfini, map->l_searchlist.r_list,
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assert (map_index < nlist);
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nlist * sizeof (struct link_map *));
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if (map_index > 0)
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/* We can skip looking for the binary itself which is at the front of
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{
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the search list. */
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/* Copy the binary into position 0. */
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l_initfini[0] = map->l_searchlist.r_list[map_index];
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/* Copy the filtees. */
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for (i = 0; i < map_index; ++i)
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l_initfini[i+1] = map->l_searchlist.r_list[i];
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/* Copy the remainder. */
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for (i = map_index + 1; i < nlist; ++i)
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l_initfini[i] = map->l_searchlist.r_list[i];
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}
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else
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memcpy (l_initfini, map->l_searchlist.r_list,
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nlist * sizeof (struct link_map *));
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_dl_sort_maps (&l_initfini[1], nlist - 1, NULL, false);
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_dl_sort_maps (&l_initfini[1], nlist - 1, NULL, false);
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/* Terminate the list of dependencies. */
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/* Terminate the list of dependencies. */
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@ -621,22 +621,25 @@ dl_open_worker (void *a)
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allows IFUNC relocations to work and it also means copy
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allows IFUNC relocations to work and it also means copy
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relocation of dependencies are if necessary overwritten. */
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relocation of dependencies are if necessary overwritten. */
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unsigned int nmaps = 0;
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unsigned int nmaps = 0;
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struct link_map *l = new;
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unsigned int j = 0;
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struct link_map *l = new->l_initfini[0];
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do
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do
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{
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{
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if (! l->l_real->l_relocated)
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if (! l->l_real->l_relocated)
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++nmaps;
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++nmaps;
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l = l->l_next;
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l = new->l_initfini[++j];
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}
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}
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while (l != NULL);
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while (l != NULL);
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/* Stack allocation is limited by the number of loaded objects. */
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struct link_map *maps[nmaps];
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struct link_map *maps[nmaps];
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nmaps = 0;
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nmaps = 0;
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l = new;
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j = 0;
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l = new->l_initfini[0];
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do
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do
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{
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{
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if (! l->l_real->l_relocated)
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if (! l->l_real->l_relocated)
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maps[nmaps++] = l;
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maps[nmaps++] = l;
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l = l->l_next;
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l = new->l_initfini[++j];
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}
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}
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while (l != NULL);
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while (l != NULL);
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_dl_sort_maps (maps, nmaps, NULL, false);
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_dl_sort_maps (maps, nmaps, NULL, false);
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47
elf/tst-auxobj-dlopen.c
Normal file
47
elf/tst-auxobj-dlopen.c
Normal file
@ -0,0 +1,47 @@
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/* Test for BZ#16272, dlopen'ing an auxiliary filter object.
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Ensure that symbols from the resolve correctly.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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static int do_test (void)
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{
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void *lib = xdlopen ("tst-filterobj-aux.so", RTLD_LAZY);
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char *(*fn)(void) = xdlsym (lib, "get_text");
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const char* text = fn ();
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printf ("%s\n", text);
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/* Verify the text matches what we expect from the filtee */
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TEST_COMPARE_STRING (text, "Hello from filtee (PASS)");
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fn = xdlsym (lib, "get_text2");
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text = fn ();
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printf ("%s\n", text);
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/* Verify the text matches what we expect from the auxiliary object */
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TEST_COMPARE_STRING (text, "Hello from auxiliary filter object (PASS)");
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return 0;
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}
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#include <support/test-driver.c>
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42
elf/tst-auxobj.c
Normal file
42
elf/tst-auxobj.c
Normal file
@ -0,0 +1,42 @@
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/* Test that symbols from auxiliary filter objects are resolved to the
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filtee.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <support/check.h>
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#include "tst-filterobj-filtee.h"
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static int do_test (void)
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{
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const char* text = get_text ();
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printf ("%s\n", text);
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/* Verify the text matches what we expect from the filtee */
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TEST_COMPARE_STRING (text, "Hello from filtee (PASS)");
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text = get_text2 ();
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printf ("%s\n", text);
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/* Verify the text matches what we expect from the auxiliary object */
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TEST_COMPARE_STRING (text, "Hello from auxiliary filter object (PASS)");
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return 0;
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}
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#include <support/test-driver.c>
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33
elf/tst-filterobj-aux.c
Normal file
33
elf/tst-filterobj-aux.c
Normal file
@ -0,0 +1,33 @@
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/* Auxiliary filter object.
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Contains symbols to be resolved in filtee, and one which doesn't.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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|
License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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|
Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
|
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|
License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include "tst-filterobj-filtee.h"
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/* We never want to see the output of the auxiliary object. */
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const char *get_text (void)
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{
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return "Hello from auxiliary filter object (FAIL)";
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}
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/* The filtee doesn't implement this symbol, so this should resolve. */
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const char *get_text2 (void)
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{
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return "Hello from auxiliary filter object (PASS)";
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}
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39
elf/tst-filterobj-dlopen.c
Normal file
39
elf/tst-filterobj-dlopen.c
Normal file
@ -0,0 +1,39 @@
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/* Test for BZ#16272, dlopen'ing a filter object.
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Ensure that symbols from the filter object resolve to the filtee.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
|
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|
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.
|
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|
|
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|
The GNU C Library is distributed in the hope that it will be useful,
|
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|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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|
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/>. */
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|
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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static int do_test (void)
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{
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void *lib = xdlopen ("tst-filterobj-flt.so", RTLD_LAZY);
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char *(*fn)(void) = xdlsym (lib, "get_text");
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const char* text = fn ();
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printf ("%s\n", text);
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||||||
|
/* Verify the text matches what we expect from the filtee */
|
||||||
|
TEST_COMPARE_STRING (text, "Hello from filtee (PASS)");
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
#include <support/test-driver.c>
|
27
elf/tst-filterobj-filtee.c
Normal file
27
elf/tst-filterobj-filtee.c
Normal file
@ -0,0 +1,27 @@
|
|||||||
|
/* Filtee for BZ#16272 test.
|
||||||
|
Contains desired symbol implementations.
|
||||||
|
|
||||||
|
Copyright (C) 2020 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 "tst-filterobj-filtee.h"
|
||||||
|
|
||||||
|
/* This is the real implementation that wants to be called */
|
||||||
|
const char *get_text (void)
|
||||||
|
{
|
||||||
|
return "Hello from filtee (PASS)";
|
||||||
|
}
|
24
elf/tst-filterobj-filtee.h
Normal file
24
elf/tst-filterobj-filtee.h
Normal file
@ -0,0 +1,24 @@
|
|||||||
|
/* Filtee header for BZ#16272 test.
|
||||||
|
Contains prototypes for symbols implemented in the filtee.
|
||||||
|
|
||||||
|
Copyright (C) 2020 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/>. */
|
||||||
|
|
||||||
|
const char *get_text (void);
|
||||||
|
|
||||||
|
/* For testing auxiliary filter object. */
|
||||||
|
const char *get_text2 (void);
|
27
elf/tst-filterobj-flt.c
Normal file
27
elf/tst-filterobj-flt.c
Normal file
@ -0,0 +1,27 @@
|
|||||||
|
/* Filter object for BZ#16272 test.
|
||||||
|
Contains symbols to be resolved in filtee.
|
||||||
|
|
||||||
|
Copyright (C) 2020 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 "tst-filterobj-filtee.h"
|
||||||
|
|
||||||
|
/* We never want to see the output of the filter object */
|
||||||
|
const char *get_text (void)
|
||||||
|
{
|
||||||
|
return "Hello from filter object (FAIL)";
|
||||||
|
}
|
36
elf/tst-filterobj.c
Normal file
36
elf/tst-filterobj.c
Normal file
@ -0,0 +1,36 @@
|
|||||||
|
/* Test that symbols from filter objects are resolved to the filtee.
|
||||||
|
|
||||||
|
Copyright (C) 2020 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 <stdio.h>
|
||||||
|
#include <support/check.h>
|
||||||
|
#include "tst-filterobj-filtee.h"
|
||||||
|
|
||||||
|
static int do_test (void)
|
||||||
|
{
|
||||||
|
const char* text = get_text ();
|
||||||
|
|
||||||
|
printf ("%s\n", text);
|
||||||
|
|
||||||
|
/* Verify the text matches what we expect from the filtee */
|
||||||
|
TEST_COMPARE_STRING (text, "Hello from filtee (PASS)");
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
#include <support/test-driver.c>
|
Loading…
Reference in New Issue
Block a user