99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
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/*
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* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/config.h"
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#include "linux/slab.h"
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#include "asm/uaccess.h"
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#include "asm/ptrace.h"
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#include "choose-mode.h"
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#include "kern.h"
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#ifdef CONFIG_MODE_TT
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extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
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/* XXX this needs copy_to_user and copy_from_user */
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int sys_modify_ldt_tt(int func, void __user *ptr, unsigned long bytecount)
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{
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if (!access_ok(VERIFY_READ, ptr, bytecount))
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return -EFAULT;
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return modify_ldt(func, ptr, bytecount);
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}
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#endif
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#ifdef CONFIG_MODE_SKAS
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extern int userspace_pid;
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#include "skas_ptrace.h"
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int sys_modify_ldt_skas(int func, void __user *ptr, unsigned long bytecount)
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{
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struct ptrace_ldt ldt;
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void *buf;
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int res, n;
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buf = kmalloc(bytecount, GFP_KERNEL);
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if(buf == NULL)
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return(-ENOMEM);
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res = 0;
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switch(func){
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case 1:
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case 0x11:
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res = copy_from_user(buf, ptr, bytecount);
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break;
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}
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if(res != 0){
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res = -EFAULT;
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goto out;
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}
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ldt = ((struct ptrace_ldt) { .func = func,
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.ptr = buf,
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.bytecount = bytecount });
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res = ptrace(PTRACE_LDT, userspace_pid, 0, (unsigned long) &ldt);
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if(res < 0)
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goto out;
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switch(func){
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case 0:
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case 2:
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n = res;
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res = copy_to_user(ptr, buf, n);
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if(res != 0)
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res = -EFAULT;
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else
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res = n;
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break;
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}
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out:
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kfree(buf);
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return(res);
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}
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#endif
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int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
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{
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return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func,
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ptr, bytecount));
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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