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x86, vdso: Remove compat vdso support

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The compat vDSO is a complicated hack that's needed to maintain
compatibility with a small range of glibc versions.

This removes it and replaces it with a much simpler hack: a config
option to disable the 32-bit vDSO by default.

This also changes the default value of CONFIG_COMPAT_VDSO to n --
users configuring kernels from scratch almost certainly want that
choice.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/4bb4690899106eb11430b1186d5cc66ca9d1660c.1394751608.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andy Lutomirski
2014-03-13 16:01:26 -07:00
committed by H. Peter Anvin
parent fa389e2202
commit b0b49f2673
8 changed files with 57 additions and 242 deletions
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4
arch/x86/include/asm/elf.h
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@@ -281,16 +281,12 @@ do { \
#define STACK_RND_MASK (0x7ff)
#define VDSO_HIGH_BASE (__fix_to_virt(FIX_VDSO))
#define ARCH_DLINFO ARCH_DLINFO_IA32(vdso_enabled)
/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
#else /* CONFIG_X86_32 */
#define VDSO_HIGH_BASE 0xffffe000U /* CONFIG_COMPAT_VDSO address */
/* 1GB for 64bit, 8MB for 32bit */
#define STACK_RND_MASK (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff)