[PATCH] Fix CONFIG_COMPAT_VDSO I wouldn't mind if CONFIG_COMPAT_VDSO went away entirely. But if it's there, it should work properly. Currently it's quite haphazard: both real vma and fixmap are mapped, both are put in the two different AT_* slots, sysenter returns to the vma address rather than the fixmap address, and core dumps yet are another story. This patch makes CONFIG_COMPAT_VDSO disable the real vma and use the fixmap area consistently. This makes it actually compatible with what the old vdso implementation did. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S index 06461b8..5e47683 100644 --- a/arch/i386/kernel/entry.S +++ b/arch/i386/kernel/entry.S
@@ -302,12 +302,16 @@ pushl $(__USER_CS) CFI_ADJUST_CFA_OFFSET 4 /*CFI_REL_OFFSET cs, 0*/ +#ifndef CONFIG_COMPAT_VDSO /* * Push current_thread_info()->sysenter_return to the stack. * A tiny bit of offset fixup is necessary - 4*4 means the 4 words * pushed above; +8 corresponds to copy_thread's esp0 setting. */ pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp) +#else + pushl $SYSENTER_RETURN +#endif CFI_ADJUST_CFA_OFFSET 4 CFI_REL_OFFSET eip, 0
diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c index 7de9117..454d12d 100644 --- a/arch/i386/kernel/sysenter.c +++ b/arch/i386/kernel/sysenter.c
@@ -100,6 +100,7 @@ return 0; } +#ifndef CONFIG_COMPAT_VDSO static struct page *syscall_nopage(struct vm_area_struct *vma, unsigned long adr, int *type) { @@ -187,3 +188,4 @@ { return 0; } +#endif
diff --git a/include/asm-i386/elf.h b/include/asm-i386/elf.h index 45d21a0..0515d61 100644 --- a/include/asm-i386/elf.h +++ b/include/asm-i386/elf.h
@@ -143,11 +143,8 @@ # define VDSO_PRELINK 0 #endif -#define VDSO_COMPAT_SYM(x) \ - (VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK) - #define VDSO_SYM(x) \ - (VDSO_BASE + (unsigned long)(x) - VDSO_PRELINK) + (VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK) #define VDSO_HIGH_EHDR ((const struct elfhdr *) VDSO_HIGH_BASE) #define VDSO_EHDR ((const struct elfhdr *) VDSO_COMPAT_BASE) @@ -156,10 +153,12 @@ #define VDSO_ENTRY VDSO_SYM(&__kernel_vsyscall) +#ifndef CONFIG_COMPAT_VDSO #define ARCH_HAS_SETUP_ADDITIONAL_PAGES struct linux_binprm; extern int arch_setup_additional_pages(struct linux_binprm *bprm, int executable_stack); +#endif extern unsigned int vdso_enabled;
diff --git a/include/asm-i386/fixmap.h b/include/asm-i386/fixmap.h index 02428cb..3e9f610 100644 --- a/include/asm-i386/fixmap.h +++ b/include/asm-i386/fixmap.h
@@ -23,6 +23,8 @@ extern unsigned long __FIXADDR_TOP; #else #define __FIXADDR_TOP 0xfffff000 +#define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) +#define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) #endif #ifndef __ASSEMBLY__
diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h index fd3f64a..7b19f45 100644 --- a/include/asm-i386/page.h +++ b/include/asm-i386/page.h
@@ -143,7 +143,9 @@ #include <asm-generic/memory_model.h> #include <asm-generic/page.h> +#ifndef CONFIG_COMPAT_VDSO #define __HAVE_ARCH_GATE_AREA 1 +#endif #endif /* __KERNEL__ */ #endif /* _I386_PAGE_H */