mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
9e38f455a6
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.
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
|
|
# Local configure fragment for sysdeps/x86.
|
|
|
|
if test $enable_cet != no; then
|
|
# Check if CET can be enabled.
|
|
AC_CACHE_CHECK(whether CET can be enabled,
|
|
libc_cv_x86_cet_available, [dnl
|
|
cat > conftest.c <<EOF
|
|
#if !defined __CET__ || __CET__ != 3
|
|
# error CET isn't available.
|
|
#endif
|
|
EOF
|
|
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -fcf-protection -include cet.h conftest.c 1>&AS_MESSAGE_LOG_FD); then
|
|
libc_cv_x86_cet_available=yes
|
|
else
|
|
libc_cv_x86_cet_available=no
|
|
fi
|
|
rm -rf conftest*])
|
|
if test $libc_cv_x86_cet_available != yes; then
|
|
AC_MSG_ERROR([$CC doesn't support CET])
|
|
fi
|
|
fi
|
|
if test $enable_cet != no; then
|
|
# Check if assembler supports CET.
|
|
AC_CACHE_CHECK(whether $AS supports CET,
|
|
libc_cv_x86_cet_as, [dnl
|
|
cat > conftest.s <<EOF
|
|
incsspd %ecx
|
|
EOF
|
|
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&AS_MESSAGE_LOG_FD); then
|
|
libc_cv_x86_cet_as=yes
|
|
else
|
|
libc_cv_x86_cet_as=no
|
|
fi
|
|
rm -rf conftest*])
|
|
if test $libc_cv_x86_cet_as = no; then
|
|
AC_MSG_ERROR([$AS doesn't support CET])
|
|
fi
|
|
fi
|
|
if test $enable_cet = yes; then
|
|
AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_elf_property)
|
|
elif test $enable_cet = permissive; then
|
|
AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_permissive)
|
|
fi
|
|
LIBC_CONFIG_VAR([enable-cet], [$enable_cet])
|