| Commit message (Collapse) | Author | Age | Files | Lines |
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Factor out _dl_clear_dtv.
2013-12-18 Andrew Hunter <ahh@google.com>
* elf/Versions (ld): Add _dl_clear_dtv.
* sysdeps/generic/ldsodefs.h (_dl_clear_dtv): New prototype.
* elf/dl-tls.c (_dl_clear_dtv): New function.
* nptl/allocatestack.c (get_cached_stack): Call _dl_clear_dtv.
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2013-12-18 Andrew Hunter <ahh@google.com>
* sysdeps/generic/ldsodefs.h (_dl_mask_all_signals): New prototype.
(_dl_unmask_signals): Likewise.
* sysdeps/mach/hurd/dl-sysdep.h (_dl_mask_all_signals): New stub.
(_dl_unmask_all_signals): Likewise.
* sysdeps/unix/sysv/linux/dl-sysdep.h (_dl_mask_all_signals): New prototype.
(_dl_unmask_all_signals): Likewise.
* sysdeps/unix/sysv/linux/dl-sysdep.c (_dl_mask_all_signals): New function.
(_dl_unmask_signals): Likewise.
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On hppa and ia64, the macro DL_AUTO_FUNCTION_ADDRESS() uses the
variable fptr[2] in it's own scope.
The content of fptr[] is thus undefined right after the macro exits.
Newer gcc's (>= 4.7) reuse the stack space of this variable triggering
a segmentation fault in dl-init.c:69.
To fix this we rewrite the macros to make the call directly to init
and fini without needing to pass back a constructed function pointer.
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Resolves: #15465
The program name may be unavailable if the user application tampers
with argc and argv[]. Some parts of the dynamic linker caters for
this while others don't, so this patch consolidates the check and
fallback into a single macro and updates all users.
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Consolidate code to search for an address within a DSO.
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It may sometimes be desirable to make the dynamic linker only pick up
libraries from the library path and rpath and not look at the
ld.so.cache that ldconfig generates. An example of such a use case is
the glibc testsuite where the dynamic linker must not be influenced by
any external paths or caches.
This change adds a new option --inhibit-ldcache that when used, tells
the dynamic linker to not use ld.so.cache even if it is available.
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The scope of a new object should be printed earlier and when the scope
of an already loaded object is extended only the changes should be
printed.
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It's already so marked in dl-sysdep.c. Failure to so mark
in the header file leads the compiler to believe that the
variable should be addressable via the .sdata section.
Signed-off-by: Richard Henderson <rth@twiddle.net>
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If a binary gets invoked by passing it as argument to ld.so the stack
still holds the auxiliary vector of ld.so when entering the _start
routine of the executable. So the invocation via ld.so is not fully
transparent to the executable. This causes problems if the executable
wants to scan the auxv itself.
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The prototype for _dl_higher_prime_number was missing. While at it,
the function is now marked with internal_function.
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Some symbols have to be identified process-wide by their name. This is
particularly important for some C++ features (e.g., class local static data
and static variables in inline functions). This cannot completely be
implemented with ELF functionality so far. The STB_GNU_UNIQUE binding
helps by ensuring the dynamic linker will always use the same definition for
all symbols with the same name and this binding.
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those which are used.
* elf/dl-addr.c: Likewise.
* elf/dl-caller.c: Likewise.
* elf/dl-fini.c: Likewise.
* elf/dl-iteratephdr.c: Likewise.
* elf/dl-libc.c: Likewise.
* elf/dl-load.c: Likewise.
* elf/dl-support.c: Likewise.
* elf/dl-sym.c: Likewise.
* elf/rtld.c: Likewise.
* sysdeps/generic/ldsodefs.h: Likewise.
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* elf/dl-minimal.c: Likewise.
* elf/dl-misc.c: Likewise.
* elf/rtld.c: Likewise.
* sysdeps/generic/ldsodefs.h: Likewise.
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* elf/dl-load.c (_dl_map_object_from_fd): Only call audit hooks
if we are not loading a new audit library.
* elf/dl-reloc (_dl_relocate_object): Third parameter is now a bitmask.
Only use profiling trampoline for auditing if we are not relocating
an audit library.
* elf/dl-open.c (dl_open_worker): Adjust _dl_relocate_object call.
* elf/rtld.c: Likewise.
* sysdeps/generic/ldsodefs.h: Adjust _dl_relocate_object prototype.
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one parameter. If non-NULL use it to initialize return value.
(_dl_setup_pointer_guard): New function.
* sysdeps/unix/sysv/linux/dl-osinfo.h: Likewise.
* sysdeps/generic/ldsodefs.h: Declare _dl_random.
* elf/rtld.c (security_init): Pass _dl_random to
_dl_setup_stack_chk_guard. Call _dl_setup_pointer_guard to initialize
pointer_chk_guard.
* elf/dl-sysdep.c (_dl_random): New variable.
(_dl_sysdep_start): Handle AT_RANDOM.
(_dl_show_auxv): Likewise.
* elf/dl-support.c (_dl_random): New variable.
(_dl_aux_init): Handle AT_RANDOM.
* csu/libc-start.c [!SHARED] (libc_start_main): Pass _dl_random
to _dl_setup_stack_chk_guard.
* elf/elf.h (AT_RANDOM): Define AT_BASE_PLATFORM and AT_RANDOM.
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change related to AT_EXECFN. We cannot use that string.
* sysdeps/generic/ldsodefs.h (struct rtld_global_ro): Remove
_dl_execfn member.
* elf/dl-support.c: Remove _dl_execfn variable.
(_dl_aux_init): Remove handling of AT_EXECFN.
* elf/dl-sysdep.c (_dl_sysdep_start): Remove handling of AT_EXECFN.
* elf/rtld.c (process_envvars): Remove use of __ASSUME_AT_EXECFN.
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* elf/rtld.c [!__ASSUME_AT_EXECFN] (process_envvars): Don't handle
LD_ORIGIN_PATH.
* elf/dl-sysdep.c (_dl_sysdep_start): Handle AT_EXECFN.
* elf/dl-support.c: Define _dl_execfn. Don't define _dl_origin_path
if __ASSUME_AT_EXECFN is defined.
(_dl_aux_init): Handle AT_EXECFN.
* sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_AT_EXECFN
for 2.6.27 and up.
* sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_execfn.
Don't define _dl_origin_path if __ASSUME_AT_EXECFN is defined.
* sysdeps/unix/sysv/linux/dl-origin.c (_dl_get_origin): Use
_dl_execfn if available and avoid compatibility code if
__ASSUME_AT_EXECFN is defined.
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* elf/dl-sysdep.c: Undefine ROUND after use.
* sysdeps/generic/ldsodefs.h [HAVE_DL_DISCOVER_OSVERSION]
(struct rtld_global_ro): Add _dl_tls_get_addr_soft element.
* elf/rtld.c (rtld_global_ro): Initialize _dl_discover_osversion.
* sysdeps/unix/sysv/linux/dl-osinfo.h: Move _dl_discover_osversion
to ...
* sysdeps/unix/sysv/linux/dl-sysdep.c: ...here.
* sysdeps/unix/sysv/linux/dl-sysdep.h: Declare _dl_discover_osversion
if necessary.
* sysdeps/unix/sysv/linux/sysconf.c: Handle _SC_ARG_MAX here.
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_dl_tls_get_addr_soft element.
* elf/rtld.c (rtld_global_ro): Initialize _dl_tls_get_addr_soft.
* elf/Versions (ld): Don't export _dl_tls_get_addr_soft.
* dlfcn/dlinfo.c (dlinfo_doit): Access dl_tls_get_addr_soft through
GLRO.
* elf/dl-iteratephdr.c (__dl_iterate_phdr): Likewise.
* elf/dl-tls.c (_dl_tls_get_addr_soft): Use attribute_hidden instead
of internal_function.
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void * pointers instead of struct link_map **.
(_dl_scope_free): Change argument type to void *.
* include/link.h (struct link_map): Change type of l_reldeps
to struct link_map_reldeps, move l_reldepsact into that
struct too.
* elf/dl-deps.c: Include atomic.h.
(_dl_map_object_deps): Only change l->l_initfini when it is
fully populated, use _dl_scope_free for freeing it. Optimize
removal of libs from reldeps by using l_reserved flag, when
some removal is needed, allocate a new list instead of
reallocating and free the old with _dl_scope_free. Adjust
for l_reldeps and l_reldepsact changes.
* elf/dl-lookup.c (add_dependency): Likewise. Reorganize to allow
searching in l_initfini and l_reldeps without holding dl_load_lock.
* elf/dl-fini.c (_dl_sort_fini): Adjust for l_reldeps and
l_reldepsact changes.
* elf/dl-close.c (_dl_close_worker): Likewise.
* elf/dl-open.c (_dl_scope_free): Change argument type to void *.
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* elf/dl-runtime.c (_dl_fixup, _dl_profile_fixup): Or in
DL_LOOKUP_GSCOPE_LOCK into flags after THREAD_GSCOPE_SET_FLAG ().
* elf/dl-sym.c (do_sym): Likewise.
* include/link.h (struct link_map): Add l_serial field.
* elf/dl-object.c (_dl_new_object): Initialize l_serial.
* elf/dl-lookup.c (add_dependency): Add flags argument.
Remember map->l_serial, if DL_LOOKUP_GSCOPE_LOCK is among
flags, use THREAD_GSCOPE_RESET_FLAG before and
THREAD_GSCOPE_SET_FLAG after
__rtld_lock_lock_recursive (GL(dl_load_lock)) to avoid deadlock.
Don't dereference map until it has been found on some list.
If map->l_serial changed, return -1.
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2007-06-13 Jakub Jelinek <jakub@redhat.com>
* include/link.h: Don't include rtld-lowlevel.h.
(struct link_map): Remove l_scope_lock.
* sysdeps/generic/ldsodefs.h: Don't include rtld-lowlevel.h.
(_dl_scope_free_list): New field (variable) in _rtld_global.
(DL_LOOKUP_SCOPE_LOCK): Remove.
(_dl_scope_free): New prototype.
* elf/dl-runtime.c (_dl_fixup): Don't use __rtld_mrlock_*lock.
Don't pass DL_LOOKUP_SCOPE_LOCK to _dl_lookup_symbol_x.
(_dl_profile_fixup): Likewise.
* elf/dl-sym.c (do_sym): Likewise. Use wrapped _dl_lookup_symbol_x
whenever !RTLD_SINGLE_THREAD_P, use THREAD_GSCOPE_SET_FLAG and
THREAD_GSCOPE_RESET_FLAG around it.
* elf/dl-close.c (_dl_close_worker): Don't use
__rtld_mrlock_{change,done}. Call _dl_scope_free on the old
scope. Make sure THREAD_GSCOPE_WAIT () happens if any old
scopes were queued or if l_scope_mem has been abandoned.
* elf/dl-open.c (_dl_scope_free): New function.
(dl_open_worker): Use it. Don't use __rtld_mrlock_{change,done}.
* elf/dl-support.c (_dl_scope_free_list): New variable.
* elf/dl-lookup.c (add_dependency): Remove flags argument.
Remove DL_LOOKUP_SCOPE_LOCK handling.
(_dl_lookup_symbol_x): Adjust caller. Remove DL_LOOKUP_SCOPE_LOCK
handling.
* elf/dl-object.c (_dl_new_object): Don't use
__rtld_mrlock_initialize.
2007-06-19 Ulrich Drepper <drepper@redhat.com>
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to fill in holes
(rtld_global_ro): Likewise.
2007-06-18 Jakub Jelinek <jakub@redhat.com>
* elf/dl-addr.c (_dl_addr): Skip PT_LOAD checking if l_contiguous.
Move PT_LOAD checking to...
(_dl_addr_inside_object): ... here, new function.
* elf/dl-sym.c (do_sym): If not l_contiguous,
call _dl_addr_inside_object.
* elf/dl-iteratephdr.c (__dl_iterate_phdr): Likewise.
* dlfcn/dlinfo.c (dlinfo_doit): Likewise.
* elf/dl-open.c (dl_open_worker): Likewise.
(_dl_addr_inside_object): New function if IS_IN_rtld.
* elf/dl-load.c (_dl_map_object_from_fd): Set l_contiguous if no
holes are present or are PROT_NONE protected.
* include/link.h (struct link_map): Add l_contiguous field.
* sysdeps/generic/ldsodefs.h (_dl_addr_inside_object): New prototype.
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global scope, wait for all lookups to finish afterwards.
* elf/dl-open.c (add_to_global): When global scope array must
grow, allocate a new one and free old array only after all
lookups finish.
* elf/dl-runtime.c (_dl_fixup): Protect using global scope.
(_dl_lookup_symbol_x): Likewise.
* elf/dl-support.c: Define _dl_wait_lookup_done.
* sysdeps/generic/ldsodefs.h (struct rtld_global): Add
_dl_wait_lookup_done.
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* elf/dl-lookup.c (add_dependency): If scope map is locked, unlock
it before getting dl_load_lock and then relock.
(_dl_lookup_symbol_x): Pass flags to add_dependency.
When rerunning _dl_lookup_symbol_x, compute symbol_scope again in
case we unlocked the scope.
* elf/dl-runtime.c (_dl_fixup): Pass DL_LOOKUP_SCOPE_LOCK to
_dl_lookup_symbol_x in case we locked the scope.
(_dl_profile_fixup): Likewise.
* elf/dl-sym.c (do_sym): In flags passed to call_dl_lookup, also
set DL_LOOKUP_SCOPE_LOCK.
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