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| author | Roland McGrath <roland@redhat.com> | 2007-01-26 00:56:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 13:50:58 -0800 |
| commit | a1f3bb9ae4497a2ed3eac773fd7798ac33a0371f (patch) | |
| tree | 18a8b6a9a26f2148e67109d79d2fe0c330fdeb64 /include | |
| parent | 7f6ee1adc75bf31d1b76814338f76a88e653cb60 (diff) | |
| download | linux-3.10-a1f3bb9ae4497a2ed3eac773fd7798ac33a0371f.tar.gz linux-3.10-a1f3bb9ae4497a2ed3eac773fd7798ac33a0371f.tar.bz2 linux-3.10-a1f3bb9ae4497a2ed3eac773fd7798ac33a0371f.zip | |
[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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-i386/elf.h | 7 | ||||
| -rw-r--r-- | include/asm-i386/fixmap.h | 2 | ||||
| -rw-r--r-- | include/asm-i386/page.h | 2 |
3 files changed, 7 insertions, 4 deletions
diff --git a/include/asm-i386/elf.h b/include/asm-i386/elf.h index 45d21a0c95b..0515d61d541 100644 --- a/include/asm-i386/elf.h +++ b/include/asm-i386/elf.h @@ -143,11 +143,8 @@ extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct # 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 @@ extern void __kernel_vsyscall; #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 02428cb3662..3e9f610c35d 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 fd3f64ace24..7b19f454761 100644 --- a/include/asm-i386/page.h +++ b/include/asm-i386/page.h @@ -143,7 +143,9 @@ extern int page_is_ram(unsigned long pagenr); #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 */ |