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[mmalloc] Use mremap to expand heaps (heap collision prevention)
[simgrid.git]
/
src
/
xbt
/
mmalloc
/
mmorecore.c
diff --git
a/src/xbt/mmalloc/mmorecore.c
b/src/xbt/mmalloc/mmorecore.c
index
9fbf7a9
..
f47c539
100644
(file)
--- a/
src/xbt/mmalloc/mmorecore.c
+++ b/
src/xbt/mmalloc/mmorecore.c
@@
-109,9
+109,14
@@
void *mmorecore(struct mdesc *mdp, ssize_t size)
/* Let's call mmap. Note that it is possible that mdp->top
is 0. In this case mmap will choose the address for us */
/* Let's call mmap. Note that it is possible that mdp->top
is 0. In this case mmap will choose the address for us */
- mapto = mmap(mdp->top, mapbytes, PROT_READ | PROT_WRITE,
+ if(mdp->base==mdp->top)
+ mapto = mmap(mdp->top, mapbytes, PROT_READ | PROT_WRITE,
MAP_PRIVATE_OR_SHARED(mdp) | MAP_IS_ANONYMOUS(mdp) |
MAP_FIXED, MAP_ANON_OR_FD(mdp), foffset);
MAP_PRIVATE_OR_SHARED(mdp) | MAP_IS_ANONYMOUS(mdp) |
MAP_FIXED, MAP_ANON_OR_FD(mdp), foffset);
+ else {
+ size_t old_size = (char*)mdp->top - (char*)mdp->base;
+ mapto = mremap(mdp->base, old_size, old_size+size, 0);
+ }
if (mapto == (void *) -1/* That's MAP_FAILED */) {
char buff[1024];
if (mapto == (void *) -1/* That's MAP_FAILED */) {
char buff[1024];
@@
-124,9
+129,6
@@
void *mmorecore(struct mdesc *mdp, ssize_t size)
abort();
}
abort();
}
- if (mdp->top == 0)
- mdp->base = mdp->breakval = mapto;
-
mdp->top = PAGE_ALIGN((char *) mdp->breakval + size);
result = (void *) mdp->breakval;
mdp->breakval = (char *) mdp->breakval + size;
mdp->top = PAGE_ALIGN((char *) mdp->breakval + size);
result = (void *) mdp->breakval;
mdp->breakval = (char *) mdp->breakval + size;