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| author | Konstantin Belousov <kib@FreeBSD.org> | 2023-07-29 17:52:52 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2023-08-25 01:06:43 +0000 |
| commit | 2fab20ed1bc565d42d4080b9a8ee81fffdfaebff (patch) | |
| tree | 2b2c66da24a47c32eaf71a5117144fddc2195c51 | |
| parent | 820ff197462530b169fcc40283a45d18f41b2dfc (diff) | |
| download | src-2fab20ed1bc565d42d4080b9a8ee81fffdfaebff.tar.gz src-2fab20ed1bc565d42d4080b9a8ee81fffdfaebff.zip | |
vm_map.c: add CONTAINS_BITS macro
(cherry picked from commit 0fb6aae7f0e19c0628c398bbe30297ef9245030e)
| -rw-r--r-- | sys/vm/vm_map.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 27360f70e1e1..9588f0591bcc 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -146,6 +146,8 @@ static int vm_map_stack_locked(vm_map_t map, vm_offset_t addrbos, static void vm_map_wire_entry_failure(vm_map_t map, vm_map_entry_t entry, vm_offset_t failed_addr); +#define CONTAINS_BITS(set, bits) ((~(set) & (bits)) == 0) + #define ENTRY_CHARGED(e) ((e)->cred != NULL || \ ((e)->object.vm_object != NULL && (e)->object.vm_object->cred != NULL && \ !((e)->eflags & MAP_ENTRY_NEEDS_COPY))) @@ -2727,15 +2729,15 @@ vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_map_entry_t entry, first_entry, in_tran, prev_entry; vm_object_t obj; struct ucred *cred; - vm_prot_t old_prot; + vm_prot_t check_prot, old_prot; int rv; if (start == end) return (KERN_SUCCESS); - if ((flags & (VM_MAP_PROTECT_SET_PROT | VM_MAP_PROTECT_SET_MAXPROT)) == - (VM_MAP_PROTECT_SET_PROT | VM_MAP_PROTECT_SET_MAXPROT) && - (new_prot & new_maxprot) != new_prot) + if (CONTAINS_BITS(flags, VM_MAP_PROTECT_SET_PROT | + VM_MAP_PROTECT_SET_MAXPROT) && + !CONTAINS_BITS(new_maxprot, new_prot)) return (KERN_OUT_OF_BOUNDS); again: @@ -2744,8 +2746,7 @@ again: if ((map->flags & MAP_WXORX) != 0 && (flags & VM_MAP_PROTECT_SET_PROT) != 0 && - (new_prot & (VM_PROT_WRITE | VM_PROT_EXECUTE)) == (VM_PROT_WRITE | - VM_PROT_EXECUTE)) { + CONTAINS_BITS(new_prot, VM_PROT_WRITE | VM_PROT_EXECUTE)) { vm_map_unlock(map); return (KERN_PROTECTION_FAILURE); } @@ -2766,6 +2767,11 @@ again: /* * Make a first pass to check for protection violations. */ + check_prot = 0; + if ((flags & VM_MAP_PROTECT_SET_PROT) != 0) + check_prot |= new_prot; + if ((flags & VM_MAP_PROTECT_SET_MAXPROT) != 0) + check_prot |= new_maxprot; for (entry = first_entry; entry->start < end; entry = vm_map_entry_succ(entry)) { if ((entry->eflags & MAP_ENTRY_GUARD) != 0) @@ -2774,12 +2780,7 @@ again: vm_map_unlock(map); return (KERN_INVALID_ARGUMENT); } - if ((flags & VM_MAP_PROTECT_SET_PROT) == 0) - new_prot = entry->protection; - if ((flags & VM_MAP_PROTECT_SET_MAXPROT) == 0) - new_maxprot = entry->max_protection; - if ((new_prot & entry->max_protection) != new_prot || - (new_maxprot & entry->max_protection) != new_maxprot) { + if (!CONTAINS_BITS(entry->max_protection, check_prot)) { vm_map_unlock(map); return (KERN_PROTECTION_FAILURE); } |