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Kernel: Defer switching the paging scope in ptrace(PT_POKE) a little

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If we can fail with EFAULT early, might as well avoid switching the
paging scope.
This commit is contained in:
Andreas Kling 2021-01-09 15:42:03 +01:00
parent e08e1a89d9
commit 8ff0afd829
Notes: sideshowbarker 2024-07-19 00:00:07 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/8ff0afd829a
1 changed files with 3 additions and 3 deletions
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6
Kernel/Syscalls/ptrace.cpp
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@ -72,11 +72,11 @@ KResultOr<u32> Process::peek_user_data(Userspace<const u32*> address)
KResult Process::poke_user_data(Userspace<u32*> address, u32 data)
{
ProcessPagingScope scope(*this);
Range range = { VirtualAddress(address), sizeof(u32) };
auto* region = find_region_containing(range);
if (!region)
return KResult(-EFAULT);
ProcessPagingScope scope(*this);
if (region->is_shared()) {
// If the region is shared, we change its vmobject to a PrivateInodeVMObject
// to prevent the write operation from changing any shared inode data
@ -97,11 +97,11 @@ KResult Process::poke_user_data(Userspace<u32*> address, u32 data)
});
if (!copy_to_user(address, &data)) {
dbg() << "Invalid address for poke_user_data: " << address.ptr();
dbgln("poke_user_data: Bad address {:p}", address.ptr());
return KResult(-EFAULT);
}
return KResult(KSuccess);
return KSuccess;
}
}