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x86/compat: Don't build the 32-bit VDSO if not needed

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Build the 32-bit vdso only for native 32-bit or 32-bit compat is
enabled.  x32 should not force it to build.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1434974121-32575-7-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Brian Gerst 2015-06-22 07:55:15 -04:00 committed by Ingo Molnar
parent 601275c3e0
commit ab8b82ee6d
3 changed files with 9 additions and 6 deletions
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6
arch/x86/entry/vdso/Makefile
View File

@ -8,7 +8,7 @@ KASAN_SANITIZE := n
VDSO64-$(CONFIG_X86_64) := y
VDSOX32-$(CONFIG_X86_X32_ABI) := y
VDSO32-$(CONFIG_X86_32) := y
VDSO32-$(CONFIG_COMPAT) := y
VDSO32-$(CONFIG_IA32_EMULATION) := y
# files to link into the vdso
vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
@ -20,7 +20,7 @@ obj-y += vma.o
vdso_img-$(VDSO64-y) += 64
vdso_img-$(VDSOX32-y) += x32
vdso_img-$(VDSO32-y) += 32-int80
vdso_img-$(CONFIG_COMPAT) += 32-syscall
vdso_img-$(CONFIG_IA32_EMULATION) += 32-syscall
vdso_img-$(VDSO32-y) += 32-sysenter
obj-$(VDSO32-y) += vdso32-setup.o
@ -126,7 +126,7 @@ $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
# Build multiple 32-bit vDSO images to choose from at boot time.
#
vdso32.so-$(VDSO32-y) += int80
vdso32.so-$(CONFIG_COMPAT) += syscall
vdso32.so-$(CONFIG_IA32_EMULATION) += syscall
vdso32.so-$(VDSO32-y) += sysenter
vdso32-images = $(vdso32.so-y:%=vdso32-%.so)

7
arch/x86/entry/vdso/vma.c
View File

@ -177,7 +177,7 @@ up_fail:
return ret;
}
#if defined(CONFIG_X86_32) || defined(CONFIG_COMPAT)
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
static int load_vdso32(void)
{
int ret;
@ -219,8 +219,11 @@ int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
return map_vdso(&vdso_image_x32, true);
}
#endif
#ifdef CONFIG_IA32_EMULATION
return load_vdso32();
#else
return 0;
#endif
}
#endif
#else

2
arch/x86/include/asm/elf.h
View File

@ -78,7 +78,7 @@ typedef struct user_fxsr_struct elf_fpxregset_t;
#ifdef CONFIG_X86_64
extern unsigned int vdso64_enabled;
#endif
#if defined(CONFIG_X86_32) || defined(CONFIG_COMPAT)
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
extern unsigned int vdso32_enabled;
#endif