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glibc/sysdeps/unix/sysv/linux/Makefile
Florian Weimer 706209867f elf: Second ld.so relocation only if libc.so has been loaded 
Commit 8f8dd904c4 (“elf:
rtld_multiple_ref is always true”) removed some code that happened
to enable compatibility with programs that do not link against
libc.so.  Such programs cannot call dlopen or any dynamic linker
functions (except __tls_get_addr), so this is not really useful.
Still ld.so should not crash with a null-pointer dereference
or undefined symbol reference in these cases.

In the main relocation loop, call _dl_relocate_object unconditionally
because it already checks if the object has been relocated.

If libc.so was loaded, self-relocate ld.so against it and call
__rtld_mutex_init and __rtld_malloc_init_real to activate the full
implementations.  Those are available only if libc.so is there,
so skip these initialization steps if libc.so is absent.  Without
libc.so, the global scope can be completely empty.  This can cause
ld.so self-relocation to fail because if it uses symbol-based
relocations, which is why the second ld.so self-relocation is not
performed if libc.so is missing.

The previous concern regarding GOT updates through self-relocation
no longer applies because function pointers are updated
explicitly through __rtld_mutex_init and __rtld_malloc_init_real,
and not through relocation.  However, the second ld.so self-relocation
is still delayed, in case there are other symbols being used.

Fixes commit 8f8dd904c4 (“elf:
rtld_multiple_ref is always true”).

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2025-01-07 09:19:01 +01:00

687 lines
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# Option to pass to Python scripts to set the C compiler. Rewriting
# MODULE_NAME is required to enable the _ISOMAC verbatim header
# environment.
sysdeps-linux-python-cc = \
--cc="$(CC) $(patsubst -DMODULE_NAME=%,-DMODULE_NAME=testsuite,$(CPPFLAGS))"
# Additional dependencies for Python scripts.
sysdeps-linux-python-deps = \
$(..)scripts/glibcextract.py \
$(..)sysdeps/unix/sysv/linux/glibcsyscalls.py \
# sysdeps-linux-python-deps
# Invocation of the Python interpreter with the Python search path.
sysdeps-linux-python = \
PYTHONPATH=$(..)scripts:$(..)sysdeps/unix/sysv/linux $(PYTHON)
ifndef subdir
# This target performs two actions:
#
# Replace <arch-syscall.h> with a file generated from kernel headers
# and <fixup-asm-unistd.h>. Both files are located via the sysdeps
# override search path.
#
# Update sysdeps/unix/sysv/linux/syscall-names.list with additional
# names found in the generated <arch-syscall.h> file, so that the
# global system call names list is a superset of the
# architecture-specific system call names.
#
# To bootstrap a new architecture, create an empty file in the right
# place and run `make update-syscall-lists' from the top-level of a
# configured, but not-yet-built glibc tree.
#
# --lock points to a file not replaced during the update operation, so
# that mutual exclusion is achieved.
.PHONY: update-syscall-lists
update-syscall-lists: arch-syscall.h
$(sysdeps-linux-python) \
sysdeps/unix/sysv/linux/update-syscall-lists.py \
$(sysdeps-linux-python-cc) \
--lock=sysdeps/unix/sysv/linux/update-syscall-lists.py $< \
sysdeps/unix/sysv/linux/syscall-names.list
endif
ifeq ($(subdir),csu)
sysdep_routines += \
errno-loc \
# sysdep_routines
endif
ifeq ($(subdir),assert)
CFLAGS-assert.c += -DFATAL_PREPARE_INCLUDE='<fatal-prepare.h>'
CFLAGS-assert-perr.c += -DFATAL_PREPARE_INCLUDE='<fatal-prepare.h>'
endif
ifeq ($(subdir),malloc)
CFLAGS-malloc.c += -DMORECORE_CLEARS=2
endif
ifeq ($(subdir),misc)
sysdep_routines += \
adjtimex \
clock_adjtime \
clone \
clone-internal \
clone-pidfd-support \
clone3 \
closefrom_fallback \
convert_scm_timestamps \
epoll_create \
epoll_pwait \
epoll_pwait2 \
epoll_wait \
eventfd \
eventfd_read \
eventfd_write \
fanotify_mark \
fxstat \
fxstat64 \
fxstatat \
fxstatat64 \
inotify_init \
lxstat \
lxstat64 \
mlock2 \
mremap \
open_by_handle_at \
personality \
pkey_get \
pkey_mprotect \
pkey_set \
prctl \
prlimit \
prlimit64 \
process_vm_readv \
process_vm_writev \
pselect32 \
readahead \
sched_getattr \
sched_setattr \
setfsgid \
setfsuid \
setvmaname \
signalfd \
splice \
sysctl \
tee \
timerfd_gettime \
timerfd_settime \
umount \
umount2 \
vmsplice \
xmknod \
xmknodat \
xstat \
xstat64 \
# sysdep_routines
CFLAGS-gethostid.c = -fexceptions
CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-vmsplice.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-splice.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-open_by_handle_at.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-sync_file_range.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-pselect32.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-tst-writev.c += "-DARTIFICIAL_LIMIT=(0x80000000-sysconf(_SC_PAGESIZE))"
# The test triggers FORTIFY abortion due to purposely wrong parameters
CFLAGS-test-errno-linux.c += $(no-fortify-source)
sysdep_headers += \
bits/a.out.h \
bits/epoll.h \
bits/eventfd.h \
bits/inotify.h \
bits/mman-linux.h \
bits/mman-map-flags-generic.h \
bits/mman-shared.h \
bits/procfs-extra.h \
bits/procfs-id.h \
bits/procfs-prregset.h \
bits/procfs.h \
bits/pthread_stack_min-dynamic.h \
bits/pthread_stack_min.h \
bits/ptrace-shared.h \
bits/rseq.h \
bits/shmlba.h \
bits/siginfo-arch.h \
bits/siginfo-consts-arch.h \
bits/signalfd.h \
bits/socket_type.h \
bits/struct_stat.h \
bits/struct_stat_time64_helper.h \
bits/syscall.h \
bits/termios-baud.h \
bits/termios-c_cc.h \
bits/termios-c_cflag.h \
bits/termios-c_iflag.h \
bits/termios-c_lflag.h \
bits/termios-c_oflag.h \
bits/termios-misc.h \
bits/termios-struct.h \
bits/termios-tcflow.h \
bits/timerfd.h \
bits/types/struct_msqid64_ds.h \
bits/types/struct_msqid64_ds_helper.h \
bits/types/struct_semid64_ds.h \
bits/types/struct_semid64_ds_helper.h \
bits/types/struct_semid_ds.h \
bits/types/struct_shmid64_ds.h \
bits/types/struct_shmid64_ds_helper.h \
scsi/scsi.h \
scsi/scsi_ioctl.h \
scsi/sg.h \
sys/acct.h \
sys/epoll.h \
sys/eventfd.h \
sys/fanotify.h \
sys/fsuid.h \
sys/inotify.h \
sys/kd.h \
sys/klog.h \
sys/mount.h \
sys/pci.h \
sys/personality.h \
sys/pidfd.h \
sys/prctl.h \
sys/quota.h \
sys/raw.h \
sys/rseq.h \
sys/signalfd.h \
sys/soundcard.h \
sys/timerfd.h \
sys/user.h \
sys/vt.h \
# sysdep_headers
tests += \
test-errno-linux \
tst-adjtimex \
tst-clock_adjtime \
tst-clone \
tst-clone2 \
tst-clone3 \
tst-epoll \
tst-epoll-ioctls \
tst-fanotify \
tst-fdopendir-o_path \
tst-getauxval \
tst-gettid \
tst-gettid-kill \
tst-linux-mremap1 \
tst-memfd_create \
tst-misalign-clone \
tst-mlock2 \
tst-mount \
tst-ntp_adjtime \
tst-ntp_gettime \
tst-ntp_gettimex \
tst-ofdlocks \
tst-personality \
tst-pidfd \
tst-pidfd_getpid \
tst-pkey \
tst-ppoll \
tst-prctl \
tst-process_mrelease \
tst-quota \
tst-rlimit-infinity \
tst-sched_setattr \
tst-scm_rights \
tst-sigtimedwait \
tst-sync_file_range \
tst-syscall-restart \
tst-sysconf-iov_max \
tst-sysvmsg-linux \
tst-sysvsem-linux \
tst-sysvshm-linux \
tst-tgkill \
tst-timerfd \
tst-ttyname-direct \
tst-ttyname-namespace \
# tests
# process_madvise requires CAP_SYS_ADMIN.
xtests += \
tst-process_madvise \
# xtests
# For +depfiles in Makerules.
extra-test-objs += \
tst-sysconf-iov_max-uapi.o \
# extra-test-objs
# Test for the symbol version of fcntl that was replaced in glibc 2.28.
ifeq ($(have-GLIBC_2.27)$(build-shared),yesyes)
tests += \
tst-ofdlocks-compat \
# tests
endif
tests-internal += \
tst-rseq \
tst-sigcontext-get_pc \
# tests-internal
tests-internal += \
tst-rseq-disable \
# tests-internal
tests-time64 += \
tst-adjtimex-time64 \
tst-clock_adjtime-time64 \
tst-epoll-time64 \
tst-ntp_adjtime-time64 \
tst-ntp_gettime-time64 \
tst-ntp_gettimex-time64 \
tst-ppoll-time64 \
tst-prctl-time64 \
tst-scm_rights-time64 \
tst-sigtimedwait-time64 \
tst-timerfd-time64 \
# tests-time64
tests-clone-internal = \
tst-align-clone-internal \
tst-clone2-internal \
tst-clone3-internal \
tst-getpid1-internal
# tests-clone-internal
tests-internal += \
$(tests-clone-internal) \
# tests-internal
tests-static += \
$(tests-clone-internal) \
# tests-static
CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables
# Generate the list of SYS_* macros for the system calls (__NR_*
# macros). The file syscall-names.list contains all possible system
# call names, and the generated header file produces SYS_* macros for
# the __NR_* macros which are actually defined.
generated += bits/syscall.h
$(objpfx)bits/syscall.h: \
../sysdeps/unix/sysv/linux/gen-syscall-h.awk \
../sysdeps/unix/sysv/linux/syscall-names.list
$(make-target-directory)
LC_ALL=C $(AWK) -f $^ > $@-tmp
$(move-if-change) $@-tmp $@
before-compile += $(objpfx)bits/syscall.h
# All macros defined by <sys/syscall.h>. Include <bits/syscall.h>
# explicitly because <sys/sycall.h> skips it if _LIBC is defined.
$(objpfx)tst-syscall-list-macros.list: \
$(objpfx)bits/syscall.h ../sysdeps/unix/sysv/linux/sys/syscall.h
printf '#include <linux/version.h>\n\
#include <sys/syscall.h>\n#include <bits/syscall.h>\n' | \
$(CC) -E -o $@-tmp $(CFLAGS) $(CPPFLAGS) -x c - -dM
$(move-if-change) $@-tmp $@
# __NR_* system call names. Used by the test below.
$(objpfx)tst-syscall-list-nr.list: \
../sysdeps/unix/sysv/linux/filter-nr-syscalls.awk \
$(objpfx)tst-syscall-list-macros.list
LC_ALL=C $(AWK) -f $^ > $@-tmp
$(move-if-change) $@-tmp $@
# SYS_* system call names. Used by the test below.
$(objpfx)tst-syscall-list-sys.list: $(objpfx)tst-syscall-list-macros.list
LC_ALL=C $(AWK) '/^#define SYS_/ { print substr($$2, 5) }' $< > $@-tmp
$(move-if-change) $@-tmp $@
tests-special += \
$(objpfx)tst-syscall-list.out
# tests-special
$(objpfx)tst-syscall-list.out: \
../sysdeps/unix/sysv/linux/tst-syscall-list.sh \
$(objpfx)tst-syscall-list-macros.list \
$(objpfx)tst-syscall-list-nr.list \
$(objpfx)tst-syscall-list-sys.list
$(BASH) $^ $(AWK) > $@; $(evaluate-test)
tests-special += \
$(objpfx)tst-glibcsyscalls.out
# tests-special
# arch-syscall.h is located via the sysdeps override search path.
$(objpfx)tst-glibcsyscalls.out: arch-syscall.h \
../sysdeps/unix/sysv/linux/syscall-names.list
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-glibcsyscalls.py \
$(sysdeps-linux-python-cc) $< \
../sysdeps/unix/sysv/linux/syscall-names.list \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-glibcsyscalls.out: \
../sysdeps/unix/sysv/linux/tst-glibcsyscalls.py \
$(sysdeps-linux-python-deps)
# Separate object file for access to the constant from the UAPI header.
$(objpfx)tst-sysconf-iov_max: $(objpfx)tst-sysconf-iov_max-uapi.o
tests-special += \
$(objpfx)tst-mman-consts.out \
# tests-special
$(objpfx)tst-mman-consts.out: ../sysdeps/unix/sysv/linux/tst-mman-consts.py
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-mman-consts.py \
$(sysdeps-linux-python-cc) \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-mman-consts.out: $(sysdeps-linux-python-deps)
tests-special += \
$(objpfx)tst-pidfd-consts.out \
# tests-special
$(objpfx)tst-pidfd-consts.out: ../sysdeps/unix/sysv/linux/tst-pidfd-consts.py
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-pidfd-consts.py \
$(sysdeps-linux-python-cc) \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-pidfd-consts.out: $(sysdeps-linux-python-deps)
tests-special += \
$(objpfx)tst-mount-consts.out \
# tests-special
$(objpfx)tst-mount-consts.out: ../sysdeps/unix/sysv/linux/tst-mount-consts.py
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-mount-consts.py \
$(sysdeps-linux-python-cc) \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-mount-consts.out: $(sysdeps-linux-python-deps)
tests-special += \
$(objpfx)tst-mount-compile.out \
# tests-special
$(objpfx)tst-mount-compile.out: ../sysdeps/unix/sysv/linux/tst-mount-compile.py
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-mount-compile.py \
$(sysdeps-linux-python-cc) \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-mount-compile.out: $(sysdeps-linux-python-deps)
tests-special += \
$(objpfx)tst-sched-consts.out \
# tests-special
$(objpfx)tst-sched-consts.out: ../sysdeps/unix/sysv/linux/tst-sched-consts.py
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-sched-consts.py \
$(sysdeps-linux-python-cc) \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-sched-consts.out: $(sysdeps-linux-python-deps)
tst-rseq-disable-ENV = GLIBC_TUNABLES=glibc.pthread.rseq=0
endif # $(subdir) == misc
ifeq ($(subdir),time)
sysdep_headers += \
bits/timex.h \
sys/timex.h \
# sysdep_headers
sysdep_routines += \
ntp_gettime \
ntp_gettimex \
# sysdep_routines
tests += \
tst-clock_gettime-clobber \
tst-gettimeofday-clobber \
tst-time-clobber \
# tests
endif
ifeq ($(subdir),signal)
tests-special += \
$(objpfx)tst-signal-numbers.out \
# tests-special
# Depending on signal.o* is a hack. What we actually want is a dependency
# on signal.h and everything it includes. That's impractical to write
# in this context, but signal.c includes signal.h and not much else so it'll
# be conservatively correct.
$(objpfx)tst-signal-numbers.out: \
../sysdeps/unix/sysv/linux/tst-signal-numbers.py \
$(objpfx)signal.o*
$(sysdeps-linux-python) \
../sysdeps/unix/sysv/linux/tst-signal-numbers.py \
$(sysdeps-linux-python-cc) \
< /dev/null > $@ 2>&1; $(evaluate-test)
$(objpfx)tst-signal-numbers.out: $(sysdeps-linux-python-deps)
endif
ifeq ($(subdir),socket)
sysdep_headers += \
bits/socket-constants.h \
net/ethernet.h \
net/if_arp.h \
net/if_packet.h \
net/if_ppp.h \
net/if_shaper.h \
net/if_slip.h \
net/ppp-comp.h \
net/ppp_defs.h \
net/route.h \
# sysdep_headers
sysdep_routines += \
cmsg_nxthdr \
# sysdep_routines
CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables
tests += \
tst-socket-timestamp \
tst-socket-timestamp-compat \
# tests
tests-time64 += \
tst-socket-timestamp-compat-time64 \
tst-socket-timestamp-time64 \
# tests-time64
tests-special += \
$(objpfx)tst-socket-consts.out \
# tests-special
$(objpfx)tst-socket-consts.out: ../sysdeps/unix/sysv/linux/tst-socket-consts.py
PYTHONPATH=../scripts \
$(PYTHON) ../sysdeps/unix/sysv/linux/tst-socket-consts.py \
--cc="$(CC) $(patsubst -DMODULE_NAME=%, \
-DMODULE_NAME=testsuite, \
$(CPPFLAGS)) -D_ISOMAC" \
< /dev/null > $@ 2>&1; $(evaluate-test)
endif # $(subdir) == socket
ifeq ($(subdir),sunrpc)
sysdep_headers += \
nfs/nfs.h \
# sysdep_headers
endif
ifeq ($(subdir),termios)
sysdep_headers += \
termio.h \
# sysdep_headers
endif
ifeq ($(subdir),posix)
sysdep_headers += \
bits/initspin.h \
# sysdep_headers
sysdep_routines += \
getcpu \
oldglob \
pidfd_getpid \
pidfd_spawn \
pidfd_spawnp \
procutils \
sched_getcpu \
spawnattr_getcgroup_np \
spawnattr_setcgroup_np \
# sysdep_routines
tests += \
tst-affinity \
tst-affinity-pid \
tst-posix_spawn-setsid-pidfd \
tst-spawn-cgroup \
tst-spawn-chdir-pidfd \
tst-spawn-pidfd \
tst-spawn2-pidfd \
tst-spawn3-pidfd \
tst-spawn4-pidfd \
tst-spawn5-pidfd \
tst-spawn6-pidfd \
tst-spawn7-pidfd \
# tests
tests-static += \
tst-affinity-static \
# tests-static
tests += \
$(tests-static) \
# tests
CFLAGS-fork.c = $(libio-mtsafe)
CFLAGS-getpid.o = -fomit-frame-pointer
CFLAGS-getpid.os = -fomit-frame-pointer
CFLAGS-tst-spawn3-pidfd.c += -DOBJPFX=\"$(objpfx)\"
tst-spawn-cgroup-ARGS = -- $(host-test-program-cmd)
tst-spawn-pidfd-ARGS = -- $(host-test-program-cmd)
tst-spawn5-pidfd-ARGS = -- $(host-test-program-cmd)
tst-spawn6-pidfd-ARGS = -- $(host-test-program-cmd)
tst-spawn7-pidfd-ARGS = -- $(host-test-program-cmd)
tst-posix_spawn-setsid-pidfd-ARGS = -- $(host-test-program-cmd)
endif
ifeq ($(subdir),inet)
sysdep_headers += \
netash/ash.h \
netatalk/at.h \
netax25/ax25.h \
neteconet/ec.h \
netinet/if_fddi.h \
netinet/if_tr.h \
netipx/ipx.h \
netiucv/iucv.h \
netpacket/packet.h \
netrom/netrom.h \
netrose/rose.h \
# sysdep_headers
sysdep_routines += \
netlink_assert_response \
# sysdep_routines
CFLAGS-check_pf.c += -fexceptions
endif
# Don't compile the ctype glue code, since there is no old non-GNU C library.
inhibit-glue = yes
ifeq ($(subdir),dirent)
sysdep_routines += \
getdirentries \
getdirentries64 \
# sysdep_routines
tests += \
tst-getdents64 \
tst-readdir64-compat \
# tests
endif # $(subdir) == dirent
ifeq ($(subdir),nis)
CFLAGS-ypclnt.c = -DUSE_BINDINGDIR=1
endif
ifeq ($(subdir),io)
sysdep_routines += \
close_nocancel \
fallocate \
fallocate64 \
fcntl_nocancel \
internal_statvfs \
open64_nocancel \
open_nocancel \
openat64_nocancel \
openat_nocancel \
pread64_nocancel \
read_nocancel \
stat_t64_cp \
statx_cp \
sync_file_range \
write_nocancel \
xstatconv \
# sysdep_routines
sysdep_headers += \
bits/fcntl-linux.h \
# sysdep_headers
tests += \
tst-fallocate \
tst-fallocate64 \
tst-getcwd-smallbuff \
tst-o_path-locks \
# tests
endif
ifeq ($(subdir),elf)
dl-routines += \
dl-rseq-symbols \
# dl-routines
sysdep-rtld-routines += \
dl-brk \
dl-getcwd \
dl-openat64 \
dl-opendir \
dl-sbrk \
# sysdep-rtld-routines
others += \
pldd \
# others
install-bin += \
pldd \
# install-bin
$(objpfx)pldd: $(objpfx)xmalloc.o
test-internal-extras += tst-nolink-libc
ifeq ($(run-built-tests),yes)
tests-special += \
$(objpfx)tst-nolink-libc-1.out \
$(objpfx)tst-nolink-libc-2.out \
# tests-special
endif
endif # $(subdir) == elf
ifeq ($(subdir),rt)
CFLAGS-mq_send.c += -fexceptions
CFLAGS-mq_receive.c += -fexceptions
endif
ifeq ($(subdir),nscd)
sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_INOTIFY -DHAVE_NETLINK
CFLAGS-gai.c += -DNEED_NETLINK
endif
ifeq ($(subdir),nptl)
tests += \
tst-align-clone \
tst-getpid1 \
tst-sem_getvalue-affinity \
# tests
# tst-rseq-nptl is an internal test because it requires a definition of
# __NR_rseq from the internal system call list.
tests-internal += \
tst-rseq-nptl \
# tests-internal
endif
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