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Do not use -Wp to disable fortify (BZ 31928)

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The -Wp does not work properly if the compiler is configured to enable
fortify by default, since it bypasses the compiler driver (which defines
the fortify flags in this case).

This patch is similar to the one used on Ubuntu [1].

I checked with a build for x86_64-linux-gnu, i686-linux-gnu,
aarch64-linux-gnu, s390x-linux-gnu, and riscv64-linux-gnu with
gcc-13 that enables the fortify by default.

Co-authored-by: Matthias Klose <matthias.klose@canonical.com>

[1] https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/glibc/tree/debian/patches/ubuntu/fix-fortify-source.patch
Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Adhemerval Zanella 2024-09-10 09:22:17 -03:00
parent 9dfea3de7f
commit 127cefd84d
6 changed files with 17 additions and 16 deletions
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4
configure vendored
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@ -7718,7 +7718,7 @@ printf "%s\n" "#define HAVE_LIBCAP 1" >>confdefs.h
fi
no_fortify_source="-Wp,-U_FORTIFY_SOURCE"
no_fortify_source="-U_FORTIFY_SOURCE"
fortify_source="${no_fortify_source}"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for maximum supported _FORTIFY_SOURCE level" >&5
@ -7773,7 +7773,7 @@ esac
if test "$libc_cv_fortify_source" = yes
then :
fortify_source="${fortify_source},-D_FORTIFY_SOURCE=${enable_fortify_source}"
fortify_source="${fortify_source} -D_FORTIFY_SOURCE=${enable_fortify_source}"
fi

4
configure.ac
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@ -1536,7 +1536,7 @@ dnl If not, then don't use it.
dnl Note that _FORTIFY_SOURCE may have been set through FLAGS too.
dnl _FORTIFY_SOURCE value will be selectively disabled for function that can't
dnl support it
no_fortify_source="-Wp,-U_FORTIFY_SOURCE"
no_fortify_source="-U_FORTIFY_SOURCE"
fortify_source="${no_fortify_source}"
AC_CACHE_CHECK([for maximum supported _FORTIFY_SOURCE level],
@ -1555,7 +1555,7 @@ AS_CASE([$enable_fortify_source],
[libc_cv_fortify_source=no])
AS_IF([test "$libc_cv_fortify_source" = yes],
[fortify_source="${fortify_source},-D_FORTIFY_SOURCE=${enable_fortify_source}"]
[fortify_source="${fortify_source} -D_FORTIFY_SOURCE=${enable_fortify_source}"]
)
AC_SUBST(enable_fortify_source)

19
debug/Makefile
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@ -171,16 +171,16 @@ CFLAGS-recvfrom_chk.c += -fexceptions -fasynchronous-unwind-tables
# set up for us, so keep the CFLAGS/CPPFLAGS split logical as the order is:
# <user CFLAGS> <test CFLAGS> <user CPPFLAGS> <test CPPFLAGS>
CFLAGS-tst-longjmp_chk.c += -fexceptions -fasynchronous-unwind-tables
CPPFLAGS-tst-longjmp_chk.c += $(no-fortify-source),-D_FORTIFY_SOURCE=1
CPPFLAGS-tst-longjmp_chk.c += $(no-fortify-source) -D_FORTIFY_SOURCE=1
CFLAGS-tst-longjmp_chk2.c += -fexceptions -fasynchronous-unwind-tables
CPPFLAGS-tst-longjmp_chk2.c += $(no-fortify-source),-D_FORTIFY_SOURCE=1
CPPFLAGS-tst-longjmp_chk2.c += $(no-fortify-source) -D_FORTIFY_SOURCE=1
CFLAGS-tst-longjmp_chk3.c += -fexceptions -fasynchronous-unwind-tables
CPPFLAGS-tst-longjmp_chk3.c += $(no-fortify-source),-D_FORTIFY_SOURCE=1
CPPFLAGS-tst-realpath-chk.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CPPFLAGS-tst-chk-cancel.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CFLAGS-tst-sprintf-fortify-rdonly.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CFLAGS-tst-fortify-syslog.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CFLAGS-tst-fortify-wide.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CPPFLAGS-tst-longjmp_chk3.c += $(no-fortify-source) -D_FORTIFY_SOURCE=1
CPPFLAGS-tst-realpath-chk.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
CPPFLAGS-tst-chk-cancel.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
CFLAGS-tst-sprintf-fortify-rdonly.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
CFLAGS-tst-fortify-syslog.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
CFLAGS-tst-fortify-wide.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
# _FORTIFY_SOURCE tests.
# Auto-generate tests for _FORTIFY_SOURCE for different levels, compilers and
@ -218,7 +218,8 @@ src-chk-nongnu = \#undef _GNU_SOURCE
# cannot be disabled via pragmas, so require -Wno-error to be used.
define gen-chk-test
tests-$(1)-$(4)-chk += tst-fortify-$(1)-$(2)-$(3)-$(4)
CFLAGS-tst-fortify-$(1)-$(2)-$(3)-$(4).$(1) += $(no-fortify-source),-D_FORTIFY_SOURCE=$(3) -Wno-format \
CFLAGS-tst-fortify-$(1)-$(2)-$(3)-$(4).$(1) += $(no-fortify-source) -D_FORTIFY_SOURCE=$(3) \
-Wno-format \
-Wno-deprecated-declarations \
-Wno-error
$(eval $(call cflags-$(2),$(1),$(3),$(4)))

2
io/Makefile
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@ -295,7 +295,7 @@ CFLAGS-read.c += -fexceptions -fasynchronous-unwind-tables $(config-cflags-wno-i
CFLAGS-write.c += -fexceptions -fasynchronous-unwind-tables $(config-cflags-wno-ignored-attributes)
CFLAGS-close.c += -fexceptions -fasynchronous-unwind-tables
CFLAGS-lseek64.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-tst-read-zero.c += $(no-fortify-source),-D_FORTIFY_SOURCE=$(supported-fortify)
CFLAGS-tst-read-zero.c += $(no-fortify-source) -D_FORTIFY_SOURCE=$(supported-fortify)
CFLAGS-test-stat.c += -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
CFLAGS-test-lfs.c += -D_LARGEFILE64_SOURCE

2
stdio-common/Makefile
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@ -598,7 +598,7 @@ 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 += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CFLAGS-tst-bz11319-fortify2.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
CFLAGS-tst-memstream-string.c += -fno-builtin-fprintf

2
wcsmbs/Makefile
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@ -264,7 +264,7 @@ CFLAGS-wcstod_l.c += $(strtox-CFLAGS) $(config-cflags-wno-ignored-attributes)
CFLAGS-wcstold_l.c += $(strtox-CFLAGS) $(config-cflags-wno-ignored-attributes)
CFLAGS-wcstof128_l.c += $(strtox-CFLAGS)
CFLAGS-wcstof_l.c += $(strtox-CFLAGS) $(config-cflags-wno-ignored-attributes)
CPPFLAGS-tst-wchar-h.c += $(no-fortify-source),-D_FORTIFY_SOURCE=2
CPPFLAGS-tst-wchar-h.c += $(no-fortify-source) -D_FORTIFY_SOURCE=2
CFLAGS-wcschr.c += $(config-cflags-wno-ignored-attributes)
CFLAGS-wmemchr.c += $(config-cflags-wno-ignored-attributes)