Date: Sun, 28 Jun 2009 23:51:39 +0000 (UTC) From: Alexander Kabaev <kan@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r195151 - in head: . gnu/lib/libgcc gnu/lib/libssp/libssp_nonshared gnu/usr.bin/cc/cc_tools lib/libc lib/libc/sys libexec/rtld-elf Message-ID: <200906282351.n5SNpdEw025143@svn.freebsd.org>
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Author: kan Date: Sun Jun 28 23:51:39 2009 New Revision: 195151 URL: http://svn.freebsd.org/changeset/base/195151 Log: Eliminate .text relocations in shared libraries compiled with stack protector. Use libssp_nonshared library to pull __stack_chk_fail_local symbol into each library that needs it instead of pulling it from libc. GCC generates local calls to this function which result in absolute relocations put into position-independent code segment, making dynamic loader do extra work everys time given shared library is being relocated and making affected text pages non-shareable. Reviewed by: kib Approved by: re (kensmith) Modified: head/Makefile.inc1 head/gnu/lib/libgcc/Makefile head/gnu/lib/libssp/libssp_nonshared/Makefile head/gnu/usr.bin/cc/cc_tools/freebsd-native.h head/lib/libc/Makefile head/lib/libc/sys/Symbol.map head/lib/libc/sys/stack_protector.c head/libexec/rtld-elf/Makefile Modified: head/Makefile.inc1 ============================================================================== --- head/Makefile.inc1 Sun Jun 28 23:21:18 2009 (r195150) +++ head/Makefile.inc1 Sun Jun 28 23:51:39 2009 (r195151) @@ -1069,7 +1069,7 @@ libraries: # # static libgcc.a prerequisite for shared libc # -_prereq_libs= gnu/lib/libgcc +_prereq_libs= gnu/lib/libssp/libssp_nonshared gnu/lib/libgcc # These dependencies are not automatically generated: # Modified: head/gnu/lib/libgcc/Makefile ============================================================================== --- head/gnu/lib/libgcc/Makefile Sun Jun 28 23:21:18 2009 (r195150) +++ head/gnu/lib/libgcc/Makefile Sun Jun 28 23:51:39 2009 (r195151) @@ -6,6 +6,12 @@ LIB= gcc SHLIB_NAME= libgcc_s.so.1 SHLIBDIR?= /lib +# +# libgcc is linked in last and thus cannot depend on ssp symbols coming +# from earlier libraries. Disable stack protection for this library. +# +WITHOUT_SSP= yes + .include <bsd.own.mk> .include "${.CURDIR}/../../usr.bin/cc/Makefile.tgt" @@ -18,7 +24,7 @@ CFLAGS+= -DIN_GCC -DIN_LIBGCC2 -D__GCC_F -I${.CURDIR}/../../usr.bin/cc/cc_tools LDFLAGS+= -nodefaultlibs -LDADD+= -lc +LDADD+= -lc -lssp_nonshared OBJS= # added to below in various ways depending on TARGET_ARCH Modified: head/gnu/lib/libssp/libssp_nonshared/Makefile ============================================================================== --- head/gnu/lib/libssp/libssp_nonshared/Makefile Sun Jun 28 23:21:18 2009 (r195150) +++ head/gnu/lib/libssp/libssp_nonshared/Makefile Sun Jun 28 23:51:39 2009 (r195151) @@ -13,6 +13,6 @@ SRCS= ssp-local.c CFLAGS+= -DHAVE_CONFIG_H CFLAGS+= -I${.CURDIR}/.. -I${GCCLIB}/libssp -I${GCCLIB}/include -CFLAGS+= -fPIC -DPIC +CFLAGS+= -fPIC -DPIC -fvisibility=hidden .include <bsd.lib.mk> Modified: head/gnu/usr.bin/cc/cc_tools/freebsd-native.h ============================================================================== --- head/gnu/usr.bin/cc/cc_tools/freebsd-native.h Sun Jun 28 23:21:18 2009 (r195150) +++ head/gnu/usr.bin/cc/cc_tools/freebsd-native.h Sun Jun 28 23:51:39 2009 (r195151) @@ -62,3 +62,11 @@ /* FreeBSD is 4.4BSD derived */ #define bsd4_4 + +/* + * Link in libssp_nonshared to get local hidden symbol for + * __stack_chk_fail_local into each binary that needs it. + * Linux does this with static part of their libc.so linker script, we reuse + * libssp_nonshared.a for the same purpose. + */ +#define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all:-lssp_nonshared}" Modified: head/lib/libc/Makefile ============================================================================== --- head/lib/libc/Makefile Sun Jun 28 23:21:18 2009 (r195150) +++ head/lib/libc/Makefile Sun Jun 28 23:51:39 2009 (r195151) @@ -26,7 +26,7 @@ PRECIOUSLIB= # DPADD+= ${LIBGCC} LDFLAGS+= -nodefaultlibs -LDADD+= -lgcc +LDADD+= -lgcc -lssp_nonshared # Define (empty) variables so that make doesn't give substitution # errors if the included makefiles don't change these: Modified: head/lib/libc/sys/Symbol.map ============================================================================== --- head/lib/libc/sys/Symbol.map Sun Jun 28 23:21:18 2009 (r195150) +++ head/lib/libc/sys/Symbol.map Sun Jun 28 23:51:39 2009 (r195151) @@ -282,7 +282,6 @@ FBSD_1.0 { socket; socketpair; __stack_chk_fail; - __stack_chk_fail_local; __stack_chk_guard; stat; statfs; Modified: head/lib/libc/sys/stack_protector.c ============================================================================== --- head/lib/libc/sys/stack_protector.c Sun Jun 28 23:21:18 2009 (r195150) +++ head/lib/libc/sys/stack_protector.c Sun Jun 28 23:51:39 2009 (r195151) @@ -47,7 +47,6 @@ static void __guard_setup(void) __attrib static void __fail(const char *); void __stack_chk_fail(void); void __chk_fail(void); -void __stack_chk_fail_local(void); /*LINTED used*/ static void @@ -109,8 +108,4 @@ __chk_fail(void) __fail("buffer overflow detected; terminated"); } -void -__stack_chk_fail_local(void) -{ - __stack_chk_fail(); -} +__sym_compat(__stack_chk_fail_local, __stack_chk_fail, FBSD_1.0); Modified: head/libexec/rtld-elf/Makefile ============================================================================== --- head/libexec/rtld-elf/Makefile Sun Jun 28 23:21:18 2009 (r195150) +++ head/libexec/rtld-elf/Makefile Sun Jun 28 23:51:39 2009 (r195151) @@ -22,7 +22,7 @@ MLINKS= rtld.1 ld-elf.so.1.1 \ CFLAGS+= -fpic -DPIC LDFLAGS+= -shared -Wl,-Bsymbolic DPADD= ${LIBC_PIC} -LDADD= -lc_pic +LDADD= -lc_pic -lssp_nonshared .if ${MACHINE_ARCH} != "ia64" .if ${MK_SYMVER} == "yes"
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