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When CET is enabled, it is an error to dlopen a non CET enabled shared library in CET enabled application. It may be desirable to make CET permissive, that is disable CET when dlopening a non CET enabled shared library. With the new --enable-cet=permissive configure option, CET is disabled when dlopening a non CET enabled shared library. Add DEFAULT_DL_X86_CET_CONTROL to config.h.in: /* The default value of x86 CET control. */ #define DEFAULT_DL_X86_CET_CONTROL cet_elf_property which enables CET features based on ELF property note. --enable-cet=permissive it to /* The default value of x86 CET control. */ #define DEFAULT_DL_X86_CET_CONTROL cet_permissive which enables CET features permissively. Update tst-cet-legacy-5a, tst-cet-legacy-5b, tst-cet-legacy-6a and tst-cet-legacy-6b to check --enable-cet and --enable-cet=permissive.
71 lines
2.3 KiB
Plaintext
71 lines
2.3 KiB
Plaintext
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
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# Local configure fragment for sysdeps/x86.
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if test $enable_cet != no; then
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# Check if CET can be enabled.
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether CET can be enabled" >&5
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$as_echo_n "checking whether CET can be enabled... " >&6; }
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if ${libc_cv_x86_cet_available+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat > conftest.c <<EOF
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#if !defined __CET__ || __CET__ != 3
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# error CET isn't available.
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#endif
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EOF
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if { ac_try='${CC-cc} -c $CFLAGS -fcf-protection -include cet.h conftest.c 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then
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libc_cv_x86_cet_available=yes
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else
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libc_cv_x86_cet_available=no
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fi
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rm -rf conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_x86_cet_available" >&5
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$as_echo "$libc_cv_x86_cet_available" >&6; }
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if test $libc_cv_x86_cet_available != yes; then
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as_fn_error $? "$CC doesn't support CET" "$LINENO" 5
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fi
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fi
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if test $enable_cet != no; then
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# Check if assembler supports CET.
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $AS supports CET" >&5
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$as_echo_n "checking whether $AS supports CET... " >&6; }
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if ${libc_cv_x86_cet_as+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat > conftest.s <<EOF
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incsspd %ecx
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EOF
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if { ac_try='${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then
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libc_cv_x86_cet_as=yes
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else
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libc_cv_x86_cet_as=no
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fi
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rm -rf conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_x86_cet_as" >&5
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$as_echo "$libc_cv_x86_cet_as" >&6; }
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if test $libc_cv_x86_cet_as = no; then
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as_fn_error $? "$AS doesn't support CET" "$LINENO" 5
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fi
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fi
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if test $enable_cet = yes; then
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$as_echo "#define DEFAULT_DL_X86_CET_CONTROL cet_elf_property" >>confdefs.h
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elif test $enable_cet = permissive; then
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$as_echo "#define DEFAULT_DL_X86_CET_CONTROL cet_permissive" >>confdefs.h
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fi
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config_vars="$config_vars
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enable-cet = $enable_cet"
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