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Add forced deletion support to _dl_close_worker
https://sourceware.org/bugzilla/show_bug.cgi?id=17833 I've a shared library that contains both undefined and unique symbols. Then I try to call the following sequence of dlopen: 1. dlopen("./libfoo.so", RTLD_NOW) 2. dlopen("./libfoo.so", RTLD_LAZY | RTLD_GLOBAL) First dlopen call terminates with error because of undefined symbols, but STB_GNU_UNIQUE ones set DF_1_NODELETE flag and hence block library in the memory. The library goes into inconsistent state as several structures remain uninitialized. For instance, relocations for GOT table were not performed. By the time of second dlopen call this library looks like as it would be fully initialized but this is not true: any call through incorrect GOT table leads to segmentation fault. On some systems this inconsistency triggers assertions in the dynamic linker. This patch adds a parameter to _dl_close_worker to implement forced object deletion in case of dlopen() failure: 1. Clears DF_1_NODELETE bit if forced, to allow library to be removed from memory. 2. For each unique symbol that is defined in this object clears appropriate entry in _ns_unique_sym_table. [BZ #17833] * elf/Makefile (tests): Add tst-nodelete. (modules-names): Add tst-nodelete-uniquemod. (tst-nodelete-uniquemod.so-no-z-defs): New. (tst-nodelete-rtldmod.so-no-z-defs): Likewise. (tst-nodelete-zmod.so-no-z-defs): Likewise. ($(objpfx)tst-nodelete): Likewise. ($(objpfx)tst-nodelete.out): Likewise. (LDFLAGS-tst-nodelete): Likewise. (LDFLAGS-tst-nodelete-zmod.so): Likewise. * elf/dl-close.c (_dl_close_worker): Add a parameter to implement forced object deletion. (_dl_close): Pass false to _dl_close_worker. * elf/dl-open.c (_dl_open): Pass true to _dl_close_worker. * elf/tst-nodelete.cc: New file. * elf/tst-nodeletelib.cc: Likewise. * elf/tst-znodeletelib.cc: Likewise. * include/dlfcn.h (_dl_close_worker): Add a new parameter.
This commit is contained in:
Pavel Kopyl
H.J. Lu
parent
890b7a4b33
commit
02d5e5d94a
22
ChangeLog
22
ChangeLog
@ -1,3 +1,25 @@
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2015-07-07 Pavel Kopyl <p.kopyl@samsung.com>
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Mikhail Ilin <m.ilin@samsung.com>
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[BZ #17833]
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* elf/Makefile (tests): Add tst-nodelete.
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(modules-names): Add tst-nodelete-uniquemod.
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(tst-nodelete-uniquemod.so-no-z-defs): New.
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(tst-nodelete-rtldmod.so-no-z-defs): Likewise.
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(tst-nodelete-zmod.so-no-z-defs): Likewise.
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($(objpfx)tst-nodelete): Likewise.
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($(objpfx)tst-nodelete.out): Likewise.
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(LDFLAGS-tst-nodelete): Likewise.
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(LDFLAGS-tst-nodelete-zmod.so): Likewise.
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* elf/dl-close.c (_dl_close_worker): Add a parameter to
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implement forced object deletion.
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(_dl_close): Pass false to _dl_close_worker.
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* elf/dl-open.c (_dl_open): Pass true to _dl_close_worker.
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* elf/tst-nodelete.cc: New file.
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* elf/tst-nodeletelib.cc: Likewise.
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* elf/tst-znodeletelib.cc: Likewise.
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* include/dlfcn.h (_dl_close_worker): Add a new parameter.
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2015-07-07 Stefan Liebler <stli@linux.vnet.ibm.com>
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[BZ #18508]
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26
NEWS
26
NEWS
@ -14,19 +14,19 @@ Version 2.22
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16526, 16538, 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195,
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17269, 17293, 17322, 17403, 17523, 17542, 17569, 17581, 17588, 17596,
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17620, 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792,
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17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
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17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
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18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
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18043, 18046, 18047, 18049, 18068, 18080, 18093, 18100, 18104, 18110,
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18111, 18116, 18125, 18128, 18138, 18185, 18196, 18197, 18206, 18210,
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18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245, 18247, 18287,
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18319, 18324, 18333, 18346, 18371, 18397, 18409, 18410, 18412, 18418,
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18422, 18434, 18435, 18444, 18468, 18469, 18470, 18479, 18483, 18495,
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18496, 18497, 18498, 18502, 18507, 18508, 18512, 18513, 18519, 18520,
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18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536, 18539,
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18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553, 18558, 18569,
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18583, 18585, 18586, 18592, 18593, 18594, 18602, 18612, 18613, 18619,
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18633.
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17833, 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964,
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17965, 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999,
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18007, 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039,
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18042, 18043, 18046, 18047, 18049, 18068, 18080, 18093, 18100, 18104,
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18110, 18111, 18116, 18125, 18128, 18138, 18185, 18196, 18197, 18206,
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18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245, 18247,
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18287, 18319, 18324, 18333, 18346, 18371, 18397, 18409, 18410, 18412,
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18418, 18422, 18434, 18435, 18444, 18468, 18469, 18470, 18479, 18483,
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18495, 18496, 18497, 18498, 18502, 18507, 18508, 18512, 18513, 18519,
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18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536,
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18539, 18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553, 18558,
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18569, 18583, 18585, 18586, 18592, 18593, 18594, 18602, 18612, 18613,
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18619, 18633.
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* Cache information can be queried via sysconf() function on s390 e.g. with
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_SC_LEVEL1_ICACHE_SIZE as argument.
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17
elf/Makefile
17
elf/Makefile
@ -132,7 +132,7 @@ tests += $(tests-static)
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ifeq (yes,$(build-shared))
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tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
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constload1 order noload filter unload \
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reldep reldep2 reldep3 reldep4 nodelete nodelete2 \
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reldep reldep2 reldep3 reldep4 nodelete nodelete2 tst-nodelete \
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nodlopen nodlopen2 neededtest neededtest2 \
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neededtest3 neededtest4 unload2 lateglobal initfirst global \
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restest2 next dblload dblunload reldep5 reldep6 reldep7 reldep8 \
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@ -207,7 +207,9 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
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tst-unique1mod1 tst-unique1mod2 \
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tst-unique2mod1 tst-unique2mod2 \
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tst-auditmod9a tst-auditmod9b \
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$(if $(CXX),tst-unique3lib tst-unique3lib2 tst-unique4lib) \
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$(if $(CXX),tst-unique3lib tst-unique3lib2 tst-unique4lib \
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tst-nodelete-uniquemod) \
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tst-nodelete-rtldmod tst-nodelete-zmod \
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tst-initordera1 tst-initorderb1 \
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tst-initordera2 tst-initorderb2 \
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tst-initordera3 tst-initordera4 \
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@ -591,6 +593,9 @@ ifuncmod5.so-no-z-defs = yes
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ifuncmod6.so-no-z-defs = yes
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tst-auditmod9a.so-no-z-defs = yes
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tst-auditmod9b.so-no-z-defs = yes
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tst-nodelete-uniquemod.so-no-z-defs = yes
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tst-nodelete-rtldmod.so-no-z-defs = yes
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tst-nodelete-zmod.so-no-z-defs = yes
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ifeq ($(build-shared),yes)
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# Build all the modules even when not actually running test programs.
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@ -1153,6 +1158,14 @@ $(objpfx)tst-unique3.out: $(objpfx)tst-unique3lib2.so
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$(objpfx)tst-unique4: $(objpfx)tst-unique4lib.so
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$(objpfx)tst-nodelete: $(libdl)
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$(objpfx)tst-nodelete.out: $(objpfx)tst-nodelete-uniquemod.so \
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$(objpfx)tst-nodelete-rtldmod.so \
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$(objpfx)tst-nodelete-zmod.so
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LDFLAGS-tst-nodelete = -rdynamic
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LDFLAGS-tst-nodelete-zmod.so = -Wl,--enable-new-dtags,-z,nodelete
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$(objpfx)tst-initorder-cmp.out: tst-initorder.exp $(objpfx)tst-initorder.out
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cmp $^ > $@; \
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$(evaluate-test)
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@ -108,7 +108,7 @@ remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp,
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void
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_dl_close_worker (struct link_map *map)
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_dl_close_worker (struct link_map *map, bool force)
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{
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/* One less direct use. */
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--map->l_direct_opencount;
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@ -152,6 +152,10 @@ _dl_close_worker (struct link_map *map)
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l->l_idx = idx;
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maps[idx] = l;
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++idx;
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/* Clear DF_1_NODELETE to force object deletion. */
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if (force)
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l->l_flags_1 &= ~DF_1_NODELETE;
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}
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assert (idx == nloaded);
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@ -635,6 +639,31 @@ _dl_close_worker (struct link_map *map)
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}
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}
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/* Reset unique symbols if forced. */
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if (force)
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{
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struct unique_sym_table *tab = &ns->_ns_unique_sym_table;
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__rtld_lock_lock_recursive (tab->lock);
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struct unique_sym *entries = tab->entries;
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if (entries != NULL)
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{
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size_t idx, size = tab->size;
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for (idx = 0; idx < size; ++idx)
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{
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/* Clear unique symbol entries that belong to this
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object. */
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if (entries[idx].name != NULL
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&& entries[idx].map == imap)
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{
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entries[idx].name = NULL;
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entries[idx].hashval = 0;
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tab->n_elements--;
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}
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}
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}
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__rtld_lock_unlock_recursive (tab->lock);
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}
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/* We can unmap all the maps at once. We determined the
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start address and length when we loaded the object and
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the `munmap' call does the rest. */
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@ -782,7 +811,7 @@ _dl_close (void *_map)
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/* Acquire the lock. */
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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_dl_close_worker (map);
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_dl_close_worker (map, false);
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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}
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@ -670,7 +670,7 @@ no more namespaces available for dlmopen()"));
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if ((mode & __RTLD_AUDIT) == 0)
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GL(dl_tls_dtv_gaps) = true;
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_dl_close_worker (args.map);
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_dl_close_worker (args.map, true);
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}
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assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
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6
elf/tst-nodelete-rtldmod.cc
Normal file
6
elf/tst-nodelete-rtldmod.cc
Normal file
@ -0,0 +1,6 @@
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extern int not_exist (void);
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int foo (void)
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{
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return not_exist ();
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}
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14
elf/tst-nodelete-uniquemod.cc
Normal file
14
elf/tst-nodelete-uniquemod.cc
Normal file
@ -0,0 +1,14 @@
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extern int not_exist (void);
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inline int make_unique (void)
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{
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/* Static variables in inline functions and classes
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generate STB_GNU_UNIQUE symbols. */
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static int unique;
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return ++unique;
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}
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int foo (void)
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{
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return make_unique () + not_exist ();
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}
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6
elf/tst-nodelete-zmod.cc
Normal file
6
elf/tst-nodelete-zmod.cc
Normal file
@ -0,0 +1,6 @@
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extern int not_exist (void);
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int foo (void)
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{
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return not_exist ();
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}
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51
elf/tst-nodelete.cc
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51
elf/tst-nodelete.cc
Normal file
@ -0,0 +1,51 @@
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#include "../dlfcn/dlfcn.h"
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#include <stdio.h>
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#include <stdlib.h>
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static int
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do_test (void)
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{
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int result = 0;
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/* This is a test for correct handling of dlopen failures for library that
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is loaded with RTLD_NODELETE flag. The first dlopen should fail because
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of undefined symbols in shared library. The second dlopen then verifies
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that library was properly unloaded. */
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if (dlopen ("tst-nodelete-rtldmod.so", RTLD_NOW | RTLD_NODELETE) != NULL
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|| dlopen ("tst-nodelete-rtldmod.so", RTLD_LAZY | RTLD_NOLOAD) != NULL)
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{
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printf ("RTLD_NODELETE test failed\n");
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result = 1;
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}
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/* This is a test for correct handling of dlopen failures for library that
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is linked with '-z nodelete' option and hence has DF_1_NODELETE flag.
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The first dlopen should fail because of undefined symbols in shared
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library. The second dlopen then verifies that library was properly
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unloaded. */
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if (dlopen ("tst-nodelete-zmod.so", RTLD_NOW) != NULL
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|| dlopen ("tst-nodelete-zmod.so", RTLD_LAZY | RTLD_NOLOAD) != NULL)
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{
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printf ("-z nodelete test failed\n");
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result = 1;
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}
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/* This is a test for correct handling of dlopen failures for library
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with unique symbols. The first dlopen should fail because of undefined
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symbols in shared library. The second dlopen then verifies that library
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was properly unloaded. */
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if (dlopen ("tst-nodelete-uniquemod.so", RTLD_NOW) != NULL
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|| dlopen ("tst-nodelete-uniquemod.so", RTLD_LAZY | RTLD_NOLOAD) != NULL)
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{
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printf ("Unique symbols test failed\n");
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result = 1;
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}
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if (result == 0)
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printf ("SUCCESS\n");
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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6
elf/tst-znodelete-zlib.cc
Normal file
6
elf/tst-znodelete-zlib.cc
Normal file
@ -0,0 +1,6 @@
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extern int not_exist (void);
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int foo (void)
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{
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return not_exist ();
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}
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@ -54,7 +54,8 @@ struct link_map;
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extern void _dl_close (void *map) attribute_hidden;
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/* Same as above, but without locking and safety checks for user
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provided map arguments. */
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extern void _dl_close_worker (struct link_map *map) attribute_hidden;
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extern void _dl_close_worker (struct link_map *map, bool force)
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attribute_hidden;
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/* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
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RTLD_NEXT). WHO is the calling function, for RTLD_NEXT. Returns
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