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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default since 2005, SKAS3/4 is obsolete and can be removed.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
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/um/include/shared/os.h
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@@ -174,7 +174,6 @@ extern unsigned long long os_makedev(unsigned major, unsigned minor);
/* start_up.c */
extern void os_early_checks(void);
extern void can_do_skas(void);
extern void os_check_bugs(void);
extern void check_host_supports_tls(int *supports_tls, int *tls_min);
@@ -187,7 +186,6 @@ extern int os_process_parent(int pid);
extern void os_stop_process(int pid);
extern void os_kill_process(int pid, int reap_child);
extern void os_kill_ptraced_process(int pid, int reap_child);
extern long os_ptrace_ldt(long pid, long addr, long data);
extern int os_getpid(void);
extern int os_getpgrp(void);

44
arch/um/include/shared/skas/proc_mm.h
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@@ -1,44 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SKAS_PROC_MM_H
#define __SKAS_PROC_MM_H
#define MM_MMAP 54
#define MM_MUNMAP 55
#define MM_MPROTECT 56
#define MM_COPY_SEGMENTS 57
struct mm_mmap {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
struct mm_munmap {
unsigned long addr;
unsigned long len;
};
struct mm_mprotect {
unsigned long addr;
unsigned long len;
unsigned int prot;
};
struct proc_mm_op {
int op;
union {
struct mm_mmap mmap;
struct mm_munmap munmap;
struct mm_mprotect mprotect;
int copy_segments;
} u;
};
#endif

3
arch/um/include/shared/skas/skas.h
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@@ -9,13 +9,10 @@
#include <sysdep/ptrace.h>
extern int userspace_pid[];
extern int proc_mm, ptrace_faultinfo, ptrace_ldt;
extern int skas_needs_stub;
extern int user_thread(unsigned long stack, int flags);
extern void new_thread_handler(void);
extern void handle_syscall(struct uml_pt_regs *regs);
extern int new_mm(unsigned long stack);
extern long execute_syscall_skas(void *r);
extern unsigned long current_stub_stack(void);

14
arch/um/include/shared/skas_ptrace.h
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@@ -1,14 +0,0 @@
/*
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#ifndef __SKAS_PTRACE_H
#define __SKAS_PTRACE_H
#define PTRACE_FAULTINFO 52
#define PTRACE_SWITCH_MM 55
#include <sysdep/skas_ptrace.h>
#endif