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Use the mmap/munmap for allocation routines.

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To avoid any issues calling malloc related routines, use mmap/munmap.
Specifically, this avoids any problems when this is compiled into a
malloc debug shared library.

(cherry picked from commit 6425327c3278137d153b8a7505f97d2f5f058d49)

Change-Id: If43d12b2c588c9abcbfbbd2c53702cdac7695a73
This commit is contained in:
Christopher Ferris 2014-07-18 12:26:45 -07:00
parent b46696858b
commit e8bc581333
1 changed files with 5 additions and 10 deletions

15
libc/bionic/debug_mapinfo.cpp

@ -29,14 +29,8 @@
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mman.h>
#ifdef USE_JEMALLOC
#include "jemalloc.h"
#define Malloc(function) je_ ## function
#else
#include "dlmalloc.h"
#define Malloc(function) dl ## function
#endif
#include "debug_mapinfo.h"
// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
@ -52,8 +46,9 @@ static mapinfo_t* parse_maps_line(char* line) {
if (len < 50) return 0;
if (line[20] != 'x') return 0;
mapinfo_t* mi = static_cast<mapinfo_t*>(Malloc(malloc)(sizeof(mapinfo_t) + (len - 47)));
if (mi == 0) return 0;
mapinfo_t* mi = static_cast<mapinfo_t*>(
mmap(NULL, sizeof(mapinfo_t) + (len - 47), PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0));
if (mi == MAP_FAILED) return 0;
mi->start = strtoul(line, 0, 16);
mi->end = strtoul(line + 9, 0, 16);
@ -85,7 +80,7 @@ __LIBC_HIDDEN__ void mapinfo_destroy(mapinfo_t* mi) {
while (mi != NULL) {
mapinfo_t* del = mi;
mi = mi->next;
Malloc(free)(del);
munmap(del, sizeof(mapinfo_t) + strlen(del->name) + 2);
}
}