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| author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2014-09-22 17:59:57 +0200 |
|---|---|---|
| committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2014-09-29 12:35:06 +0200 |
| commit | db9ad21d272a4dce53c35095b97ca0a597b45004 (patch) | |
| tree | dd230face414cba271bf4542981561424638884f | |
| parent | af77f771b687d3653018bc18b1b07a4805beaa19 (diff) | |
exec: redzone page zero before loading anything
This prevents load_section from mapping any sections to page zero.
* exec/exec.c (do_exec): Redzone page zero before loading anything.
| -rw-r--r-- | exec/exec.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/exec/exec.c b/exec/exec.c index 2fc1e441..0ecf2d3e 100644 --- a/exec/exec.c +++ b/exec/exec.c @@ -1116,6 +1116,16 @@ do_exec (file_t file, mach_port_destroy (oldtask, destroynames[i]); } + /* Map page zero redzoned. */ + { + vm_address_t addr = 0; + e.error = vm_map (newtask, + &addr, vm_page_size, 0, 0, MACH_PORT_NULL, 0, 1, + VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY); + if (e.error) + goto out; + } + /* XXX this should be below it is here to work around a vm_map kernel bug. */ if (interp.file != MACH_PORT_NULL) |