mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/* Determine if address is inside object load segments.
|
|
Copyright (C) 1996-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <link.h>
|
|
#include <elf.h>
|
|
|
|
/* Return non-zero if ADDR lies within one of L's loadable segments.
|
|
We have three cases we care about.
|
|
|
|
Case 1: addr is above a segment.
|
|
+==================+<- l_map_end
|
|
| |<- addr
|
|
|------------------|<- l_addr + p_vaddr + p_memsz
|
|
| |
|
|
| |
|
|
|------------------|<- l_addr + p_vaddr
|
|
|------------------|<- l_addr
|
|
| |
|
|
+==================+<- l_map_start
|
|
|
|
Case 2: addr is within a segments.
|
|
+==================+<- l_map_end
|
|
| |
|
|
|------------------|<- l_addr + p_vaddr + p_memsz
|
|
| |<- addr
|
|
| |
|
|
|------------------|<- l_addr + p_vaddr
|
|
|------------------|<- l_addr
|
|
| |
|
|
+==================+<- l_map_start
|
|
|
|
Case 3: addr is below a segments.
|
|
+==================+<- l_map_end
|
|
| |
|
|
|------------------|<- l_addr + p_vaddr + p_memsz
|
|
| |
|
|
| |
|
|
|------------------|<- l_addr + p_vaddr
|
|
|------------------|<- l_addr
|
|
| |<- addr
|
|
+==================+<- l_map_start
|
|
|
|
All the arithmetic is unsigned and we shift all the values down by
|
|
l_addr + p_vaddr and then compare the normalized addr to the range
|
|
of interest i.e. 0 <= addr < p_memsz.
|
|
|
|
*/
|
|
int
|
|
internal_function
|
|
_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
|
|
{
|
|
int n = l->l_phnum;
|
|
const ElfW(Addr) reladdr = addr - l->l_addr;
|
|
|
|
while (--n >= 0)
|
|
if (l->l_phdr[n].p_type == PT_LOAD
|
|
&& reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
|
|
return 1;
|
|
return 0;
|
|
}
|