256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
/*
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* (c) Copyright 1990 Conor P. Cahill (uunet!virtech!cpcahil).
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* You may copy, distribute, and use this software as long as this
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* copyright statement is not removed.
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*/
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#include <stdio.h>
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#include "malloc.h"
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#include "debug.h"
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#ifndef lint
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static
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char rcs_hdr[] = "$Id: mlc_chk.c,v 1.2 2006-07-25 10:09:34 rt Exp $";
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#endif
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extern struct mlist malloc_start;
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extern struct mlist * malloc_end;
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extern char * malloc_data_start;
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extern char * malloc_data_end;
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/*
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* Function: malloc_in_arena()
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*
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* Purpose: to verify address is within malloc arena.
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*
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* Arguments: ptr - pointer to verify
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*
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* Returns: TRUE - if pointer is within malloc area
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* FALSE - otherwise
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*
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* Narrative:
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* IF pointer is >= malloc area start AND <= malloc area end
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* return TRUE
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* ELSE
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* return FALSE
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*
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* Mod History:
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* 90/01/24 cpcahil Initial revision.
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*/
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int
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malloc_in_arena(ptr)
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char * ptr;
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{
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extern char * malloc_data_start;
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extern char * malloc_data_end;
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int rtn = 0;
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if( ptr >= malloc_data_start && ptr <= malloc_data_end )
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{
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rtn = 1;
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}
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return(rtn);
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}
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/*
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* Function: malloc_check_str()
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*
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* Arguments: func - name of function calling this routine
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* str - pointer to area to check
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*
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* Purpose: to verify that if str is within the malloc arena, the data
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* it points to does not extend beyond the applicable region.
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*
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* Returns: Nothing of any use (function is void).
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*
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* Narrative:
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* IF pointer is within malloc arena
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* determin length of string
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* call malloc_verify() to verify data is withing applicable region
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* return
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*
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* Mod History:
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* 90/01/24 cpcahil Initial revision.
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* 90/01/29 cpcahil Added code to ignore recursive calls.
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*/
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void
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malloc_check_str(func,str)
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char * func;
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char * str;
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{
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static int layers;
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register char * s;
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if( (layers++ == 0) && malloc_in_arena(str) )
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{
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for( s=str; *s; s++)
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{
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}
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malloc_verify(func,str,s-str+1);
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}
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layers--;
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}
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/*
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* Function: malloc_check_strn()
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*
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* Arguments: func - name of function calling this routine
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* str - pointer to area to check
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* len - max length of string
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*
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* Purpose: to verify that if str is within the malloc arena, the data
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* it points to does not extend beyond the applicable region.
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*
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* Returns: Nothing of any use (function is void).
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*
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* Narrative:
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* IF pointer is within malloc arena
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* determin length of string
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* call malloc_verify() to verify data is withing applicable region
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* return
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*
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* Mod History:
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* 90/01/24 cpcahil Initial revision.
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* 90/01/29 cpcahil Added code to ignore recursive calls.
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* 90/08/29 cpcahil added length (for strn* functions)
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*/
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void
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malloc_check_strn(func,str,len)
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char * func;
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char * str;
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int len;
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{
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register int i;
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static int layers;
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register char * s;
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if( (layers++ == 0) && malloc_in_arena(str) )
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{
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for( s=str,i=0; (i < len) && *s; s++)
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{
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}
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malloc_verify(func,str,s-str+1);
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}
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layers--;
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}
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/*
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* Function: malloc_check_data()
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*
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* Arguments: func - name of function calling this routine
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* ptr - pointer to area to check
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* len - length to verify
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*
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* Purpose: to verify that if ptr is within the malloc arena, the data
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* it points to does not extend beyond the applicable region.
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*
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* Returns: Nothing of any use (function is void).
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*
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* Narrative:
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* IF pointer is within malloc arena
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* call malloc_verify() to verify data is withing applicable region
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* return
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*
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* Mod History:
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* 90/01/24 cpcahil Initial revision.
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* 90/01/29 cpcahil Added code to ignore recursive calls.
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*/
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void
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malloc_check_data(func,ptr,len)
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char * func;
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char * ptr;
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int len;
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{
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static int layers;
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if( layers++ == 0 )
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{
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DEBUG3(40,"malloc_check_data(%s,0x%x,%d) called...",
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func,ptr,len);
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if( malloc_in_arena(ptr) )
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{
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DEBUG0(10,"pointer in malloc arena, verifying...");
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malloc_verify(func,ptr,len);
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}
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}
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layers--;
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}
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/*
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* Function: malloc_verify()
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*
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* Arguments: func - name of function calling the malloc check routines
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* ptr - pointer to area to check
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* len - length to verify
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*
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* Purpose: to verify that the data ptr points to does not extend beyond
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* the applicable malloc region. This function is only called
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* if it has been determined that ptr points into the malloc arena.
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*
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* Returns: Nothing of any use (function is void).
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*
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* Narrative:
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*
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* Mod History:
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* 90/01/24 cpcahil Initial revision.
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*/
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void
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malloc_verify(func,ptr,len)
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char * func;
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char * ptr;
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int len;
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{
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extern struct mlist * malloc_end;
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extern int malloc_errno;
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extern struct mlist malloc_start;
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struct mlist * mptr;
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DEBUG3(40,"malloc_verify(%s,0x%x,%d) called...", func,ptr,len);
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/*
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* Find the malloc block that includes this pointer
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*/
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mptr = &malloc_start;
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while( mptr &&
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! (((char *)mptr < ptr) && ((mptr->data+mptr->s.size) > ptr) ) )
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{
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mptr = mptr->next;
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}
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/*
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* if ptr was not in a malloc block, it must be part of
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* some direct sbrk() stuff, so just return.
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*/
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if( ! mptr )
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{
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DEBUG1(10,"ptr (0x%x) not found in malloc search", ptr);
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return;
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}
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/*
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* Now we have a valid malloc block that contains the indicated
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* pointer. We must verify that it is withing the requested block
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* size (as opposed to the real block size which is rounded up to
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* allow for correct alignment).
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*/
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DEBUG4(60,"Checking 0x%x-0x%x, 0x%x-0x%x",
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ptr, ptr+len, mptr->data, mptr->data+mptr->r_size);
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if( (ptr < mptr->data) || ((ptr+len) > (mptr->data+mptr->r_size)) )
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{
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DEBUG4(0,"pointer not within region 0x%x-0x%x, 0x%x-0x%x",
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ptr, ptr+len, mptr->data, mptr->data+mptr->r_size);
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malloc_errno = M_CODE_OUTOF_BOUNDS;
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malloc_warning(func);
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}
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return;
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}
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