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um: Remove SKAS3/4 support

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Before we had SKAS0 UML had two modes of operation
TT (tracing thread) and SKAS3/4 (separated kernel address space).
TT was known to be insecure and got removed a long time ago.
SKAS3/4 required a few (3 or 4) patches on the host side which never went
mainline. The last host patch is 10 years old.

With SKAS0 mode (separated kernel address space using 0 host patches),
default since 2005, SKAS3/4 is obsolete and can be removed.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger
2015-03-18 21:31:27 +01:00
parent aaeac66b1a
commit d0b5e15f0c
18 changed files with 145 additions and 811 deletions
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3
arch/x86/um/shared/sysdep/faultinfo_32.h
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@@ -27,9 +27,6 @@ struct faultinfo {
/* This is Page Fault */
#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
/* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
#define SEGV_MAYBE_FIXABLE(fi) ((fi)->trap_no == 0 && ptrace_faultinfo)
#define PTRACE_FULL_FAULTINFO 0
#endif

3
arch/x86/um/shared/sysdep/faultinfo_64.h
View File

@@ -27,9 +27,6 @@ struct faultinfo {
/* This is Page Fault */
#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
/* No broken SKAS API, which doesn't pass trap_no, here. */
#define SEGV_MAYBE_FIXABLE(fi) 0
#define PTRACE_FULL_FAULTINFO 1
#endif

22
arch/x86/um/shared/sysdep/skas_ptrace.h
View File

@@ -1,22 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_X86_SKAS_PTRACE_H
#define __SYSDEP_X86_SKAS_PTRACE_H
struct ptrace_faultinfo {
int is_write;
unsigned long addr;
};
struct ptrace_ldt {
int func;
void *ptr;
unsigned long bytecount;
};
#define PTRACE_LDT 54
#endif