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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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16
Kernel/Syscalls/prctl.cpp
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@ -21,6 +21,22 @@ ErrorOr<FlatPtr> Process::sys$prctl(int option, FlatPtr arg1, [[maybe_unused]] F
return EINVAL;
protected_data.dumpable = arg1;
return 0;
case PR_GET_NO_NEW_SYSCALL_REGION_ANNOTATIONS:
return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
return space->enforces_syscall_regions();
});
case PR_SET_NO_NEW_SYSCALL_REGION_ANNOTATIONS:
if (arg1 != 0 && arg1 != 1)
return EINVAL;
bool prohibit_new_annotated_syscall_regions = (arg1 == 1);
return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
if (space->enforces_syscall_regions() && !prohibit_new_annotated_syscall_regions)
return EPERM;
space->set_enforces_syscall_regions(prohibit_new_annotated_syscall_regions);
return 0;
});
return 0;
}
return EINVAL;
});