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2d2d9f2b48
glibc/stdio-common/Makefile
Siddhesh Poyarekar 2d2d9f2b48 Move malloc hooks into a compat DSO 
Remove all malloc hook uses from core malloc functions and move it
into a new library libc_malloc_debug.so.  With this, the hooks now no
longer have any effect on the core library.

libc_malloc_debug.so is a malloc interposer that needs to be preloaded
to get hooks functionality back so that the debugging features that
depend on the hooks, i.e. malloc-check, mcheck and mtrace work again.
Without the preloaded DSO these debugging features will be nops.
These features will be ported away from hooks in subsequent patches.

Similarly, legacy applications that need hooks functionality need to
preload libc_malloc_debug.so.

The symbols exported by libc_malloc_debug.so are maintained at exactly
the same version as libc.so.

Finally, static binaries will no longer be able to use malloc
debugging features since they cannot preload the debugging DSO.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
2021-07-22 18:37:59 +05:30

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Makefile
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# Copyright (C) 1991-2021 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/>.
#
# Specific makefile for stdio-common.
#
subdir := stdio-common
include ../Makeconfig
headers := stdio_ext.h printf.h bits/printf-ldbl.h bits/stdio_lim.h
routines := \
ctermid cuserid \
_itoa _itowa itoa-digits itoa-udigits itowa-digits \
vfprintf vprintf printf_fp reg-printf printf-prs printf_fphex \
reg-modifier reg-type \
printf_size fprintf printf snprintf sprintf asprintf dprintf \
vfwprintf vfscanf vfwscanf \
fscanf scanf sscanf \
perror psignal \
tmpfile tmpfile64 tmpnam tmpnam_r tempnam tempname \
getline getw putw \
remove rename renameat renameat2 \
flockfile ftrylockfile funlockfile \
isoc99_scanf isoc99_vscanf isoc99_fscanf isoc99_vfscanf isoc99_sscanf \
isoc99_vsscanf \
psiginfo gentempfd \
vfscanf-internal vfwscanf-internal iovfscanf \
vfprintf-internal vfwprintf-internal
aux := errlist siglist printf-parsemb printf-parsewc fxprintf
tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
temptest tst-fileno test-fwrite tst-ungetc tst-ferror \
xbug errnobug \
bug1 bug2 bug3 bug4 bug5 bug6 bug7 bug8 bug9 bug10 bug11 bug12 bug13 \
tfformat tiformat tllformat tstdiomisc tst-printfsz tst-wc-printf \
scanf1 scanf2 scanf3 scanf4 scanf5 scanf7 scanf8 scanf9 scanf10 \
scanf11 scanf12 tst-tmpnam tst-cookie tst-obprintf tst-sscanf \
tst-swprintf tst-fseek tst-fmemopen test-vfprintf tst-gets \
tst-perror tst-sprintf tst-rndseek tst-fdopen tst-fphex bug14 \
tst-popen tst-unlockedio tst-fmemopen2 tst-put-error tst-fgets \
tst-fwrite bug16 bug17 tst-swscanf tst-sprintf2 bug18 bug18a \
bug19 bug19a tst-popen2 scanf13 scanf14 scanf15 bug20 bug21 bug22 \
scanf16 scanf17 tst-setvbuf1 tst-grouping bug23 bug24 \
bug-vfprintf-nargs tst-long-dbl-fphex tst-fphex-wide tst-sprintf3 \
bug25 tst-printf-round bug23-2 bug23-3 bug23-4 bug26 tst-fmemopen3 \
tst-printf-bz18872 tst-vfprintf-width-prec tst-fmemopen4 \
tst-vfprintf-user-type \
tst-vfprintf-mbs-prec \
tst-scanf-round \
tst-renameat2 tst-bz11319 tst-bz11319-fortify2 \
scanf14a scanf16a \
tst-printf-bz25691 \
tst-vfprintf-width-prec-alloc \
tst-printf-fp-free \
tst-printf-fp-leak \
test-strerr
test-srcs = tst-unbputc tst-printf tst-printfsz-islongdouble
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-unbputc.out $(objpfx)tst-printf.out \
$(objpfx)tst-printf-bz18872-mem.out \
$(objpfx)tst-setvbuf1-cmp.out \
$(objpfx)tst-vfprintf-width-prec-mem.out \
$(objpfx)tst-printfsz-islongdouble.out \
$(objpfx)tst-printf-bz25691-mem.out \
$(objpfx)tst-printf-fp-free-mem.out \
$(objpfx)tst-printf-fp-leak-mem.out
generated += tst-printf-bz18872.c tst-printf-bz18872.mtrace \
tst-printf-bz18872-mem.out \
tst-vfprintf-width-prec.mtrace tst-vfprintf-width-prec-mem.out \
tst-printf-bz25691.mtrace tst-printf-bz25691-mem.out \
tst-printf-fp-free.mtrace tst-printf-fp-free-mem.out \
tst-printf-fp-leak.mtrace tst-printf-fp-leak-mem.out
endif
tests-special += $(objpfx)tst-errno-manual.out
include ../Rules
ifeq ($(run-built-tests),yes)
LOCALES := de_DE.ISO-8859-1 de_DE.UTF-8 en_US.ISO-8859-1 ja_JP.EUC-JP
include ../gen-locales.mk
$(objpfx)bug14.out: $(gen-locales)
$(objpfx)scanf13.out: $(gen-locales)
$(objpfx)test-vfprintf.out: $(gen-locales)
$(objpfx)tst-grouping.out: $(gen-locales)
$(objpfx)tst-sprintf.out: $(gen-locales)
$(objpfx)tst-sscanf.out: $(gen-locales)
$(objpfx)tst-swprintf.out: $(gen-locales)
$(objpfx)tst-vfprintf-mbs-prec.out: $(gen-locales)
endif
tst-printf-bz18872-ENV = MALLOC_TRACE=$(objpfx)tst-printf-bz18872.mtrace \
LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
tst-vfprintf-width-prec-ENV = \
MALLOC_TRACE=$(objpfx)tst-vfprintf-width-prec.mtrace \
LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
tst-printf-bz25691-ENV = \
MALLOC_TRACE=$(objpfx)tst-printf-bz25691.mtrace \
LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
tst-printf-fp-free-ENV = \
MALLOC_TRACE=$(objpfx)tst-printf-fp-free.mtrace \
LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
tst-printf-fp-leak-ENV = \
MALLOC_TRACE=$(objpfx)tst-printf-fp-leak.mtrace \
LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
$(objpfx)tst-unbputc.out: tst-unbputc.sh $(objpfx)tst-unbputc
$(SHELL) $< $(common-objpfx) '$(test-program-prefix)'; \
$(evaluate-test)
$(objpfx)tst-printf.out: tst-printf.sh $(objpfx)tst-printf
$(SHELL) $< $(common-objpfx) '$(test-program-prefix)'; \
$(evaluate-test)
$(objpfx)tst-printfsz-islongdouble.out: \
tst-printfsz-islongdouble.sh $(objpfx)tst-printfsz-islongdouble
$(SHELL) $^ '$(test-program-prefix)' $@; \
$(evaluate-test)
# We generate this source because it requires a printf invocation with
# 10K arguments.
$(objpfx)tst-printf-bz18872.c: tst-printf-bz18872.sh
rm -f $@ && $(BASH) $^ > $@.new && mv $@.new $@
$(objpfx)tst-%-mem.out: $(objpfx)tst-%.out
$(common-objpfx)malloc/mtrace $(objpfx)tst-$*.mtrace > $@; \
$(evaluate-test)
errlist-h = $(firstword $(wildcard $(addsuffix /errlist.h,$(sysdirs) .)))
$(objpfx)tst-errno-manual.out: tst-errno-manual.py \
$(errlist-h) \
$(..)manual/errno.texi
$(PYTHON) tst-errno-manual.py -m $(..)manual/errno.texi \
-e $(errlist-h) > $@; \
$(evaluate-test)
CFLAGS-vfprintf.c += -Wno-uninitialized
CFLAGS-vfwprintf.c += -Wno-uninitialized
CFLAGS-tmpfile.c += -fexceptions
CFLAGS-tmpfile64.c += -fexceptions
CFLAGS-tempname.c += -fexceptions
CFLAGS-psignal.c += -fexceptions
CFLAGS-vprintf.c += -fexceptions
CFLAGS-cuserid.c += -fexceptions
CFLAGS-vfprintf.c += -fexceptions
CFLAGS-fprintf.c += -fexceptions
CFLAGS-printf.c += -fexceptions
CFLAGS-vfwprintf.c += -fexceptions
CFLAGS-vfscanf.c += -fexceptions
CFLAGS-vfwscanf.c += -fexceptions
CFLAGS-fscanf.c += -fexceptions
CFLAGS-scanf.c += -fexceptions
CFLAGS-isoc99_vfscanf.c += -fexceptions
CFLAGS-isoc99_vscanf.c += -fexceptions
CFLAGS-isoc99_fscanf.c += -fexceptions
CFLAGS-isoc99_scanf.c += -fexceptions
CFLAGS-errlist.c += $(fno-unit-at-a-time)
CFLAGS-siglist.c += $(fno-unit-at-a-time)
# scanf14a.c and scanf16a.c test a deprecated extension which is no
# longer visible under most conformance levels; see the source files
# for more detail.
CFLAGS-scanf14a.c += -std=gnu89
CFLAGS-scanf16a.c += -std=gnu89
CFLAGS-bug3.c += -DOBJPFX=\"$(objpfx)\"
CFLAGS-bug4.c += -DOBJPFX=\"$(objpfx)\"
CFLAGS-bug5.c += -DOBJPFX=\"$(objpfx)\"
CFLAGS-test-fseek.c += -DOBJPFX=\"$(objpfx)\"
CFLAGS-test-popen.c += -DOBJPFX=\"$(objpfx)\"
CFLAGS-test_rdwr.c += -DOBJPFX=\"$(objpfx)\"
# tst-gets.c tests a deprecated function.
CFLAGS-tst-gets.c += -Wno-deprecated-declarations
# BZ #11319 was first fixed for regular vdprintf, then reopened because
# the fortified version had the same bug.
CFLAGS-tst-bz11319-fortify2.c += -D_FORTIFY_SOURCE=2
CPPFLAGS += $(libio-mtsafe)
$(objpfx)tst-setvbuf1.out: /dev/null $(objpfx)tst-setvbuf1
$(test-program-cmd) > $@ 2>&1; \
$(evaluate-test)
$(objpfx)tst-setvbuf1-cmp.out: tst-setvbuf1.expect $(objpfx)tst-setvbuf1.out
cmp $^ > $@; \
$(evaluate-test)
$(objpfx)tst-printf-round: $(libm)
$(objpfx)tst-scanf-round: $(libm)
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