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Kernel+Userland: Refine preventing syscall annotations of Regions option

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Instead of using a special case of the annotate_mapping syscall, let's
introduce a new prctl option to disallow further annotations of Regions
as new syscall Region(s).
This commit is contained in:
Liav A 2023-01-20 00:37:14 +02:00 • committed by Linus Groh
parent 08de5abc6d
commit b27f88f61d
4 changed files with 23 additions and 6 deletions
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8
Kernel/Syscalls/mmap.cpp
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@ -578,6 +578,9 @@ ErrorOr<FlatPtr> Process::sys$annotate_mapping(Userspace<void*> address, int fla
if (flags == to_underlying(VirtualMemoryRangeFlags::None))
return EINVAL;
if (!address)
return EINVAL;
if (!Memory::is_user_address(address.vaddr()))
return EFAULT;
@ -585,11 +588,6 @@ ErrorOr<FlatPtr> Process::sys$annotate_mapping(Userspace<void*> address, int fla
if (space->enforces_syscall_regions() && (flags & to_underlying(VirtualMemoryRangeFlags::SyscallCode)))
return EPERM;
if (!address) {
space->set_enforces_syscall_regions(true);
return 0;
}
auto* region = space->find_region_containing(Memory::VirtualRange { address.vaddr(), 1 });
if (!region)
return EINVAL;