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glibc/stdlib/Makefile
Adhemerval Zanella 461cab1de7 linux: Add support for getrandom vDSO 
Linux 6.11 has getrandom() in vDSO. It operates on a thread-local opaque
state allocated with mmap using flags specified by the vDSO.

Multiple states are allocated at once, as many as fit into a page, and
these are held in an array of available states to be doled out to each
thread upon first use, and recycled when a thread terminates. As these
states run low, more are allocated.

To make this procedure async-signal-safe, a simple guard is used in the
LSB of the opaque state address, falling back to the syscall if there's
reentrancy contention.

Also, _Fork() is handled by blocking signals on opaque state allocation
(so _Fork() always sees a consistent state even if it interrupts a
getrandom() call) and by iterating over the thread stack cache on
reclaim_stack. Each opaque state will be in the free states list
(grnd_alloc.states) or allocated to a running thread.

The cancellation is handled by always using GRND_NONBLOCK flags while
calling the vDSO, and falling back to the cancellable syscall if the
kernel returns EAGAIN (would block). Since getrandom is not defined by
POSIX and cancellation is supported as an extension, the cancellation is
handled as 'may occur' instead of 'shall occur' [1], meaning that if
vDSO does not block (the expected behavior) getrandom will not act as a
cancellation entrypoint. It avoids a pthread_testcancel call on the fast
path (different than 'shall occur' functions, like sem_wait()).

It is currently enabled for x86_64, which is available in Linux 6.11,
and aarch64, powerpc32, powerpc64, loongarch64, and s390x, which are
available in Linux 6.12.

Link: https://pubs.opengroup.org/onlinepubs/9799919799/nframe.html [1]
Co-developed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tested-by: Jason A. Donenfeld <Jason@zx2c4.com> # x86_64
Tested-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> # x86_64, aarch64
Tested-by: Xi Ruoyao <xry111@xry111.site> # x86_64, aarch64, loongarch64
Tested-by: Stefan Liebler <stli@linux.ibm.com> # s390x
2024-11-12 14:42:12 -03:00

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# Copyright (C) 1991-2024 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/>.
#
# Makefile for stdlib routines
#
subdir := stdlib
include ../Makeconfig
headers := \
alloca.h \
bits/errno.h \
bits/indirect-return.h \
bits/monetary-ldbl.h \
bits/stdint-intn.h \
bits/stdint-least.h \
bits/stdint-uintn.h \
bits/stdlib-bsearch.h \
bits/stdlib-float.h \
bits/stdlib-ldbl.h \
bits/stdlib.h \
bits/time64.h \
bits/timesize.h \
bits/types/error_t.h \
bits/wordsize.h \
errno.h \
fmtmsg.h \
inttypes.h \
monetary.h \
stdbit.h \
stdint.h \
stdlib.h \
sys/errno.h \
sys/random.h \
sys/ucontext.h \
ucontext.h \
# headers
routines := \
a64l \
abort \
abs \
arc4random \
arc4random_uniform \
at_quick_exit \
atof \
atoi \
atol\
atoll \
bsearch \
canonicalize \
cxa_at_quick_exit \
cxa_atexit \
cxa_finalize \
cxa_thread_atexit_impl \
div \
drand48 \
drand48-iter \
drand48_r \
erand48 \
erand48_r \
exit \
fmtmsg \
getcontext \
getentropy \
getenv \
getrandom \
getsubopt \
jrand48 \
jrand48_r \
l64a \
labs \
lcong48 \
lcong48_r \
ldiv \
llabs \
lldiv \
lrand48 \
lrand48_r \
makecontext \
mblen \
mbstowcs \
mbtowc \
mrand48 \
mrand48_r \
nrand48 \
nrand48_r \
old_atexit \
on_exit atexit \
putenv \
qsort \
quick_exit \
rand \
rand_r \
random \
random_r \
rpmatch \
secure-getenv \
seed48 \
seed48_r \
setcontext \
setenv \
srand48 \
srand48_r \
stdc_bit_ceil_uc \
stdc_bit_ceil_ui \
stdc_bit_ceil_ul \
stdc_bit_ceil_ull \
stdc_bit_ceil_us \
stdc_bit_floor_uc \
stdc_bit_floor_ui \
stdc_bit_floor_ul \
stdc_bit_floor_ull \
stdc_bit_floor_us \
stdc_bit_width_uc \
stdc_bit_width_ui \
stdc_bit_width_ul \
stdc_bit_width_ull \
stdc_bit_width_us \
stdc_count_ones_uc \
stdc_count_ones_ui \
stdc_count_ones_ul \
stdc_count_ones_ull \
stdc_count_ones_us \
stdc_count_zeros_uc \
stdc_count_zeros_ui \
stdc_count_zeros_ul \
stdc_count_zeros_ull \
stdc_count_zeros_us \
stdc_first_leading_one_uc \
stdc_first_leading_one_ui \
stdc_first_leading_one_ul \
stdc_first_leading_one_ull \
stdc_first_leading_one_us \
stdc_first_leading_zero_uc \
stdc_first_leading_zero_ui \
stdc_first_leading_zero_ul \
stdc_first_leading_zero_ull \
stdc_first_leading_zero_us \
stdc_first_trailing_one_uc \
stdc_first_trailing_one_ui \
stdc_first_trailing_one_ul \
stdc_first_trailing_one_ull \
stdc_first_trailing_one_us \
stdc_first_trailing_zero_uc \
stdc_first_trailing_zero_ui \
stdc_first_trailing_zero_ul \
stdc_first_trailing_zero_ull \
stdc_first_trailing_zero_us \
stdc_has_single_bit_uc \
stdc_has_single_bit_ui \
stdc_has_single_bit_ul \
stdc_has_single_bit_ull \
stdc_has_single_bit_us \
stdc_leading_ones_uc \
stdc_leading_ones_ui \
stdc_leading_ones_ul \
stdc_leading_ones_ull \
stdc_leading_ones_us \
stdc_leading_zeros_uc \
stdc_leading_zeros_ui \
stdc_leading_zeros_ul \
stdc_leading_zeros_ull \
stdc_leading_zeros_us \
stdc_trailing_ones_uc \
stdc_trailing_ones_ui \
stdc_trailing_ones_ul \
stdc_trailing_ones_ull \
stdc_trailing_ones_us \
stdc_trailing_zeros_uc \
stdc_trailing_zeros_ui \
stdc_trailing_zeros_ul \
stdc_trailing_zeros_ull \
stdc_trailing_zeros_us \
strfmon \
strfmon_l \
strfromd \
strfromf \
strfroml \
strtod \
strtod_l \
strtod_nan \
strtof \
strtof_l \
strtof_nan \
strtol \
strtol_l \
strtold \
strtold_l \
strtold_nan \
strtoll \
strtoll_l \
strtoul \
strtoul_l \
strtoull \
strtoull_l \
swapcontext \
system \
wcstombs \
wctomb \
xpg_basename \
# routines
# Exclude fortified routines from being built with _FORTIFY_SOURCE
routines_no_fortify += \
mbstowcs \
wcstombs \
wctomb \
# routines_no_fortify
aux = \
grouping \
groupingwc \
tens_in_limb \
# aux
# These routines will be omitted from the libc shared object.
# Instead the static object files will be included in a special archive
# linked against when the shared library will be used.
static-only-routines = \
at_quick_exit \
atexit \
# static-only-routines
test-srcs := \
tst-fmtmsg \
#test-srcs
tests := \
bug-fmtmsg1 \
bug-getcontext \
bug-strtod \
bug-strtod2 \
test-a64l \
test-at_quick_exit-race \
test-atexit-race \
test-atexit-recursive \
test-bz22786 \
test-canon \
test-canon2 \
test-cxa_atexit-race \
test-cxa_atexit-race2 \
test-dlclose-exit-race \
test-on_exit-race \
testdiv \
testmb \
testmb2 \
testrand \
testsort \
tst-abs \
tst-arc4random-fork \
tst-arc4random-stats \
tst-arc4random-thread \
tst-at_quick_exit \
tst-atexit \
tst-atof1 \
tst-atof2 \
tst-bsearch \
tst-bz20544 \
tst-canon-bz26341 \
tst-concurrent-exit \
tst-concurrent-quick_exit \
tst-cxa_atexit \
tst-environ \
tst-getrandom \
tst-getrandom2 \
tst-labs \
tst-limits \
tst-llabs \
tst-makecontext \
tst-makecontext-align \
tst-makecontext2 \
tst-makecontext3 \
tst-on_exit \
tst-qsort \
tst-qsort2 \
tst-qsort3 \
tst-qsort6 \
tst-quick_exit \
tst-rand48 \
tst-rand48-2 \
tst-random \
tst-random2 \
tst-realpath \
tst-realpath-toolong \
tst-secure-getenv \
tst-setcontext \
tst-setcontext2 \
tst-setcontext3 \
tst-setcontext4 \
tst-setcontext5 \
tst-setcontext6 \
tst-setcontext7 \
tst-setcontext8 \
tst-setcontext9 \
tst-setcontext10 \
tst-setcontext11 \
tst-stdbit-Wconversion \
tst-stdbit-builtins \
tst-stdc_bit_ceil \
tst-stdc_bit_floor \
tst-stdc_bit_width \
tst-stdc_count_ones \
tst-stdc_count_zeros \
tst-stdc_first_leading_one \
tst-stdc_first_leading_zero \
tst-stdc_first_trailing_one \
tst-stdc_first_trailing_zero \
tst-stdc_has_single_bit \
tst-stdc_leading_ones \
tst-stdc_leading_zeros \
tst-stdc_trailing_ones \
tst-stdc_trailing_zeros \
tst-strfmon_l \
tst-strfrom \
tst-strfrom-locale \
tst-strtod \
tst-strtod-nan-locale \
tst-strtod-nan-sign \
tst-strtod-overflow \
tst-strtod-round \
tst-strtod-underflow \
tst-strtod2 \
tst-strtod5 \
tst-strtod6 \
tst-strtol \
tst-strtol-binary-c11 \
tst-strtol-binary-c23 \
tst-strtol-binary-gnu11 \
tst-strtol-binary-gnu23 \
tst-strtol-locale \
tst-strtoll \
tst-swapcontext1 \
tst-swapcontext2 \
tst-thread-quick_exit \
tst-tininess \
tst-unsetenv1 \
tst-width \
tst-width-stdint \
tst-xpg-basename \
# tests
tests-internal := \
tst-qsort4 \
tst-strtod1i \
tst-strtod3 \
tst-strtod4 \
tst-strtod5i \
tst-tls-atexit \
tst-tls-atexit-nodelete \
# tests-internal
tests-static := \
tst-secure-getenv \
# tests-static
tests-container := \
tst-system \
#tests-container
ifeq ($(build-hardcoded-path-in-tests),yes)
tests += \
tst-empty-env \
# tests
endif
LDLIBS-test-atexit-race = $(shared-thread-library)
LDLIBS-test-at_quick_exit-race = $(shared-thread-library)
LDLIBS-test-cxa_atexit-race = $(shared-thread-library)
LDLIBS-test-cxa_atexit-race2 = $(shared-thread-library)
LDLIBS-test-on_exit-race = $(shared-thread-library)
LDLIBS-tst-canon-bz26341 = $(shared-thread-library)
LDLIBS-tst-arc4random-fork = $(shared-thread-library)
LDLIBS-tst-arc4random-thread = $(shared-thread-library)
LDLIBS-tst-system = $(shared-thread-library)
LDLIBS-test-dlclose-exit-race = $(shared-thread-library)
LDFLAGS-test-dlclose-exit-race = $(LDFLAGS-rdynamic)
LDLIBS-test-dlclose-exit-race-helper.so = $(libsupport) $(shared-thread-library)
CFLAGS-tst-abs.c += -fno-builtin
CFLAGS-tst-labs.c += -fno-builtin
CFLAGS-tst-llabs.c += -fno-builtin
CFLAGS-tst-stdbit-Wconversion.c += -Wconversion -Werror
CFLAGS-tst-stdc_trailing_zeros.c += -fno-builtin
CFLAGS-tst-stdc_trailing_ones.c += -fno-builtin
CFLAGS-tst-stdc_leading_zeros.c += -fno-builtin
CFLAGS-tst-stdc_leading_ones.c += -fno-builtin
CFLAGS-tst-stdc_has_single_bit.c += -fno-builtin
CFLAGS-tst-stdc_first_trailing_zero.c += -fno-builtin
CFLAGS-tst-stdc_first_trailing_one.c += -fno-builtin
CFLAGS-tst-stdc_first_leading_zero.c += -fno-builtin
CFLAGS-tst-stdc_first_leading_one.c += -fno-builtin
CFLAGS-tst-stdc_count_zeros.c += -fno-builtin
CFLAGS-tst-stdc_count_ones.c += -fno-builtin
CFLAGS-tst-stdc_bit_width.c += -fno-builtin
CFLAGS-tst-stdc_bit_floor.c += -fno-builtin
CFLAGS-tst-stdc_bit_ceil.c += -fno-builtin
ifeq ($(have-cxx-thread_local),yes)
CFLAGS-tst-quick_exit.o = -std=c++11
LDLIBS-tst-quick_exit = -lstdc++
CFLAGS-tst-thread-quick_exit.o = -std=c++11
LDLIBS-tst-thread-quick_exit = -lstdc++
$(objpfx)tst-thread-quick_exit: $(shared-thread-library)
else
tests-unsupported += \
tst-quick_exit \
tst-thread-quick_exit \
# tests-unsupported
endif
modules-names = \
test-dlclose-exit-race-helper \
tst-tls-atexit-lib \
# modules-names
extra-test-objs += $(addsuffix .os, $(modules-names))
ifeq ($(build-shared),yes)
tests += \
tst-putenv \
# tests
endif
# Several mpn functions from GNU MP are used by the strtod function.
mpn-routines := \
add_n \
addmul_1 \
cmp \
divmod_1 \
divrem \
inlines \
lshift \
mod_1 \
mul \
mul_1 \
mul_n \
rshift \
sub_n \
submul_1 \
udiv_qrnnd \
# mpn-routines
mpn-headers = \
asm-syntax.h \
gmp-impl.h \
gmp-mparam.h \
gmp.h \
longlong.h \
# mpn-headers
routines := \
$(strip $(routines) $(mpn-routines)) \
dbl2mpn \
ldbl2mpn \
mpn2dbl \
mpn2flt \
mpn2ldbl \
# routines
aux += \
fpioconst \
mp_clz_tab \
# aux
tests-extras += \
tst-putenvmod \
# tests-extras
extra-test-objs += \
tst-putenvmod.os \
# extra-test-objs
generated += \
isomac \
isomac.out \
tst-putenvmod.so \
# generated
CFLAGS-bsearch.c += $(uses-callbacks)
CFLAGS-qsort.c += $(uses-callbacks)
CFLAGS-system.c += -fexceptions
CFLAGS-system.os = -fomit-frame-pointer
CFLAGS-fmtmsg.c += -fexceptions
CFLAGS-strfmon.c += $(libio-mtsafe)
CFLAGS-strfmon_l.c += $(libio-mtsafe)
# The strfrom class of functions call __printf_fp in order to convert the
# floating-point value to characters. This requires the value of IO_MTSAFE_IO.
CFLAGS-strfromd.c += $(libio-mtsafe)
CFLAGS-strfromf.c += $(libio-mtsafe)
CFLAGS-strfroml.c += $(libio-mtsafe)
CFLAGS-strtol.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtoul.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtoll.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtoull.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtof.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtof_l.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtod.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtod_l.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtold.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-strtold_l.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-secure-getenv.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-tst-bsearch.c += $(stack-align-test-flags)
CFLAGS-tst-qsort.c += $(stack-align-test-flags)
CFLAGS-tst-makecontext.c += -funwind-tables
CFLAGS-tst-makecontext2.c += $(stack-align-test-flags)
CFLAGS-testmb.c += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Wall -Werror
# Some versions of GCC supported for building glibc do not support -std=c23
# or -std=gnu23 (added in GCC 14), or the older names -std=c2x or -std=gnu2x
# (added in GCC 9), so the tests for those versions use -std=c11 and -std=gnu11
# and then _ISOC23_SOURCE is defined in the test as needed.
CFLAGS-tst-strtol-binary-c11.c += -std=c11
CFLAGS-tst-strtol-binary-c23.c += -std=c11
CFLAGS-tst-strtol-binary-gnu11.c += -std=gnu11
CFLAGS-tst-strtol-binary-gnu23.c += -std=gnu11
# Run a test on the header files we use.
tests-special += $(objpfx)isomac.out
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-fmtmsg.out
endif
include ../Rules
ifeq ($(run-built-tests),yes)
LOCALES := \
cs_CZ.UTF-8 \
de_DE.UTF-8 \
el_GR.UTF-8 \
en_US.ISO-8859-1 \
hi_IN.UTF-8 \
hr_HR.UTF-8 \
tg_TJ.UTF-8 \
tr_TR.ISO-8859-9 \
tr_TR.UTF-8 \
# LOCALES
include ../gen-locales.mk
$(objpfx)bug-strtod2.out: $(gen-locales)
$(objpfx)testmb2.out: $(gen-locales)
$(objpfx)tst-strtod.out: $(gen-locales)
$(objpfx)tst-strtod1i.out: $(gen-locales)
$(objpfx)tst-strtod3.out: $(gen-locales)
$(objpfx)tst-strtod4.out: $(gen-locales)
$(objpfx)tst-strtod5.out: $(gen-locales)
$(objpfx)tst-strtod5i.out: $(gen-locales)
$(objpfx)tst-strtol-locale.out: $(gen-locales)
$(objpfx)tst-strtod-nan-locale.out: $(gen-locales)
$(objpfx)tst-strfmon_l.out: $(gen-locales)
$(objpfx)tst-strfrom.out: $(gen-locales)
$(objpfx)tst-strfrom-locale.out: $(gen-locales)
$(objpfx)test-dlclose-exit-race.out: $(objpfx)test-dlclose-exit-race-helper.so
endif
# Testdir has to be named stdlib and needs to be writable
test-canon-ARGS = --test-dir=${common-objpfx}stdlib
bug-fmtmsg1-ENV = SEV_LEVEL=foo,11,newsev
$(objpfx)isomac.out: $(objpfx)isomac
$(dir $<)$(notdir $<) '$(CC)' \
'-I../include $(+sysdep-includes) $(sysincludes) -I..' > $@; \
$(evaluate-test)
isomac-CFLAGS = -O
$(objpfx)isomac: isomac.c
$(native-compile)
$(objpfx)tst-fmtmsg.out: tst-fmtmsg.sh $(objpfx)tst-fmtmsg
$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
'$(run-program-env)' '$(test-program-prefix-after-env)' \
$(common-objpfx)stdlib/; \
$(evaluate-test)
$(objpfx)tst-putenv: $(objpfx)tst-putenvmod.so
LDFLAGS-tst-putenv = -Wl,--no-as-needed
$(objpfx)tst-putenvmod.so: $(objpfx)tst-putenvmod.os $(link-libc-deps)
$(build-module)
libof-tst-putenvmod = extramodules
$(objpfx)bug-getcontext: $(libm)
$(objpfx)bug-strtod2: $(libm)
$(objpfx)tst-strtod-round: $(libm)
$(objpfx)tst-tininess: $(libm)
$(objpfx)tst-strtod-underflow: $(libm)
$(objpfx)tst-strtod6: $(libm)
$(objpfx)tst-strtod-nan-locale: $(libm)
$(objpfx)tst-strtod-nan-sign: $(libm)
tst-tls-atexit-lib.so-no-z-defs = yes
test-dlclose-exit-race-helper.so-no-z-defs = yes
$(objpfx)tst-tls-atexit: $(shared-thread-library)
$(objpfx)tst-tls-atexit.out: $(objpfx)tst-tls-atexit-lib.so
$(objpfx)tst-tls-atexit-nodelete: $(shared-thread-library)
$(objpfx)tst-tls-atexit-nodelete.out: $(objpfx)tst-tls-atexit-lib.so
$(objpfx)tst-setcontext3.out: tst-setcontext3.sh $(objpfx)tst-setcontext3
$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
'$(run-program-env)' '$(test-program-prefix-after-env)' \
$(common-objpfx)stdlib/; \
$(evaluate-test)
$(objpfx)tst-qsort5: $(libm)
$(objpfx)tst-concurrent-exit: $(shared-thread-library)
$(objpfx)tst-concurrent-quick_exit: $(shared-thread-library)
$(objpfx)tst-getrandom2: $(shared-thread-library)
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