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Kernel: Fail madvise() volatile change with EINVAL for non-purgeable mem

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AnonymousVMObject::set_volatile() assumes that nobody ever calls it on
non-purgeable objects, so let's make sure we don't do that.

Also return EINVAL instead of EPERM for non-anonymous VM objects so the
error codes match.
This commit is contained in:
Andreas Kling 2021-07-28 20:40:37 +02:00
parent 410b3c85b6
commit b807f1c3fc
1 changed files with 3 additions and 1 deletions
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4
Kernel/Syscalls/mmap.cpp
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@ -472,8 +472,10 @@ KResultOr<FlatPtr> Process::sys$madvise(Userspace<void*> address, size_t size, i
return EINVAL;
if (set_volatile || set_nonvolatile) {
if (!region->vmobject().is_anonymous())
return EPERM;
return EINVAL;
auto& vmobject = static_cast<AnonymousVMObject&>(region->vmobject());
if (!vmobject.is_purgeable())
return EINVAL;
bool was_purged = false;
auto result = vmobject.set_volatile(set_volatile, was_purged);
if (result.is_error())