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authorRoland McGrath <roland@hack.frob.com>2011-07-09 13:55:24 -0700
committerRoland McGrath <roland@hack.frob.com>2011-07-09 13:55:24 -0700
commit574920b446870648623a85e00dd8f3ca9f482c0e (patch)
treeb4fe7f1fcb36ff56af9cd2e636ab5d194829e1a6 /configure
parentd30cf5bb00bfb286ff14d931fb69f5b53724bcdc (diff)
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Rewrite -z relro configure check to be empirical.
Diffstat (limited to 'configure')
-rwxr-xr-xconfigure93
1 files changed, 75 insertions, 18 deletions
diff --git a/configure b/configure
index 9d951ec..252f637 100755
--- a/configure
+++ b/configure
@@ -6342,40 +6342,97 @@ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_z_initfirst" >&5
$as_echo "$libc_cv_z_initfirst" >&6; }
+ # Add-on fragments can set these for other machines.
+ libc_commonpagesize=${libc_commonpagesize:-no}
+ libc_relro_required=${libc_relro_required:-no}
case "$base_machine" in
- i[34567]86 | x86_64 | powerpc* | s390* | sparc* | alpha*)
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -z relro option" >&5
+ i[34567]86 | x86_64 | powerpc* | s390*)
+ libc_commonpagesize=0x1000
+ libc_relro_required=yes
+ ;;
+ sparc*)
+ libc_commonpagesize=0x2000
+ libc_relro_required=yes
+ ;;
+ ia64*)
+ libc_commonpagesize=0x4000
+ ;;
+ alpha*)
+ libc_commonpagesize=0x10000
+ libc_relro_required=yes
+ ;;
+ esac
+
+ if test $libc_commonpagesize != no; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -z relro option" >&5
$as_echo_n "checking for -z relro option... " >&6; }
if ${libc_cv_z_relro+:} false; then :
$as_echo_n "(cached) " >&6
else
- libc_cv_z_relro=no
- if { ac_try='${CC-cc} -v --help 2>&1|grep "z relro" 1>&5'
+ libc_cv_z_relro=no
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int _start (void) { return 42; }
+extern void _exit (int);
+const void *relro[] = { &_start, &_exit, 0 };
+
+_ACEOF
+ cat > conftest.awk <<\EOF
+BEGIN {
+ result = "no"
+ commonpagesize = strtonum(commonpagesize)
+}
+{ print "LINE:", $0 > "/dev/stderr" }
+$1 == "GNU_RELRO" {
+ vaddr = strtonum($3)
+ memsz = strtonum($6)
+ end = vaddr + memsz
+ printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
+ vaddr, memsz, end, commonpagesize > "/dev/stderr"
+ result = (end % commonpagesize == 0) ? "yes" : "broken"
+}
+END { print result }
+EOF
+ { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+ -fPIC -shared -o conftest.so conftest.c
+ -nostartfiles -nostdlib
+ -Wl,-z,relro 1>&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
- test $ac_status = 0; }; }
- then
- if { ac_try='${CC-cc} -Wl,--verbose 2>&1|grep DATA_SEGMENT_RELRO_END 1>&5'
+ test $ac_status = 0; }; } &&
+ { ac_try='$READELF -Wl conftest.so > conftest.ph'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
- test $ac_status = 0; }; }
- then
- libc_cv_z_relro=yes
- fi
- fi
+ test $ac_status = 0; }; } &&
+ { ac_try='
+ $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
+ conftest.ph > conftest.cps
+ '
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } &&
+ libc_cv_z_relro=`cat conftest.cps 2>&5`
+ rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_z_relro" >&5
$as_echo "$libc_cv_z_relro" >&6; }
- if test "$libc_cv_z_relro" = no; then
- as_fn_error $? "linker with -z relro support required" "$LINENO" 5
- fi
- ;;
- *) ;;
- esac
+ if { test "x$libc_relro_required" = xyes &&
+ test "x$libc_cv_z_relro" != xyes
+ }
+ then
+ as_fn_error $? "linker with -z relro support required" "$LINENO" 5
+ fi
+ else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: missing architecture parameter to check for working -z relro" >&5
+$as_echo "$as_me: WARNING: missing architecture parameter to check for working -z relro" >&2;}
+ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -Bgroup option" >&5
$as_echo_n "checking for -Bgroup option... " >&6; }