diff options
Diffstat (limited to 'sysdeps/mach/hurd/brk.c')
| -rw-r--r-- | sysdeps/mach/hurd/brk.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sysdeps/mach/hurd/brk.c b/sysdeps/mach/hurd/brk.c index 3a5ed54247..c5d09a35ac 100644 --- a/sysdeps/mach/hurd/brk.c +++ b/sysdeps/mach/hurd/brk.c @@ -72,9 +72,18 @@ _hurd_set_brk (vm_address_t addr) if (pagend <= pagebrk) { if (pagend < pagebrk) - /* Make that memory inaccessible. */ - __vm_protect (__mach_task_self (), pagend, pagebrk - pagend, - 0, VM_PROT_NONE); + { + /* XXX wish this were atomic... */ + /* First deallocate the memory to release its backing space. */ + __vm_deallocate (__mach_task_self (), pagend, pagebrk - pagend); + /* Now reallocate it with no access allowed. */ + err = __vm_map (__mach_task_self (), + &pagend, _hurd_data_end - pagend, + 0, 0, MACH_PORT_NULL, 0, 0, + 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE, + VM_INHERIT_COPY); + /* XXX what if error? */ + } _hurd_brk = addr; return 0; } |