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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2022-11-27 22:10:10 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2022-11-27 22:10:10 +0100 |
| commit | df10aa6983e86b688e4a9b4f30db6d07ad540964 (patch) | |
| tree | ab58cb4e949a1445eb206e438a6746ec9ee1f1e9 | |
| parent | 97314ab115206137018b0cd7196ce404ceee136c (diff) | |
| download | gnumach-df10aa6983e86b688e4a9b4f30db6d07ad540964.tar.gz gnumach-df10aa6983e86b688e4a9b4f30db6d07ad540964.tar.bz2 gnumach-df10aa6983e86b688e4a9b4f30db6d07ad540964.zip | |
vm_wire_all: Fix vm_map_protect case
If a "wire_required" process calls vm_map_protect(0), the
memory gets unwired as expected. But if the process then calls
vm_map_protect(VM_PROT_READ) again, we need to wire that memory.
(This happens to be exactly what glibc does for its heap)
This fixes Hurd hangs on lack of memory, during which mach was swapping
pieces of mach-defpager out.
| -rw-r--r-- | vm/vm_map.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/vm/vm_map.c b/vm/vm_map.c index 9f5eb13d..0dec1f20 100644 --- a/vm/vm_map.c +++ b/vm/vm_map.c @@ -1632,7 +1632,8 @@ kern_return_t vm_map_protect( */ if ((current->protection != VM_PROT_NONE) && - (current->wired_access != VM_PROT_NONE)) { + (current->wired_access != VM_PROT_NONE || + map->wiring_required)) { current->wired_access = current->protection; } |