diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2014-06-19 02:59:48 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-06-20 02:45:12 +0400 |
| commit | bfad381c0d1e19cae8461e105d8d4387dd2a14fe (patch) | |
| tree | c4f4fba23ad53bfe9c6f99c4c9156716fa3fa5c5 /arch/x86/vdso/Makefile | |
| parent | c1979c370273fd9f7326ffa27a63b9ddb0f495f4 (diff) | |
| download | linux-bfad381c0d1e19cae8461e105d8d4387dd2a14fe.tar.xz | |
x86/vdso: Improve the fake section headers
Fully stripping the vDSO has other unfortunate side effects:
- binutils is unable to find ELF notes without a SHT_NOTE section.
- Even elfutils has trouble: it can find ELF notes without a section
table at all, but if a section table is present, it won't look for
PT_NOTE.
- gdb wants section names to match between stripped DSOs and their
symbols; otherwise it will corrupt symbol addresses.
We're also breaking the rules: section 0 is supposed to be SHT_NULL.
Fix these problems by building a better fake section table. While
we're at it, we might as well let buggy Go versions keep working well
by giving the SHT_DYNSYM entry the correct size.
This is a bit unfortunate: it adds quite a bit of size to the vdso
image.
If/when binutils improves and the improved versions become widespread,
it would be worth considering dropping most of this.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/0e546a5eeaafdf1840e6ee654a55c1e727c26663.1403129369.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/vdso/Makefile')
| -rw-r--r-- | arch/x86/vdso/Makefile | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile index 3c0809a0631f..2c1ca98eb612 100644 --- a/arch/x86/vdso/Makefile +++ b/arch/x86/vdso/Makefile @@ -11,7 +11,6 @@ VDSO32-$(CONFIG_COMPAT) := y # files to link into the vdso vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vdso-fakesections.o -vobjs-nox32 := vdso-fakesections.o # files to link into kernel obj-y += vma.o @@ -134,7 +133,7 @@ override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ targets += vdso32/vdso32.lds targets += vdso32/note.o vdso32/vclock_gettime.o $(vdso32.so-y:%=vdso32/%.o) -targets += vdso32/vclock_gettime.o +targets += vdso32/vclock_gettime.o vdso32/vdso-fakesections.o $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%) @@ -155,6 +154,7 @@ $(vdso32-images:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \ $(obj)/vdso32/vdso32.lds \ $(obj)/vdso32/vclock_gettime.o \ + $(obj)/vdso32/vdso-fakesections.o \ $(obj)/vdso32/note.o \ $(obj)/vdso32/%.o $(call if_changed,vdso) |