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LibCore: Implement new ptrace_peekbuf wrapper for PT_PEEKBUF syscall

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Ben Wiederhake 2021-11-25 23:04:52 +01:00 • committed by Andreas Kling
parent 0f8483f09c
commit 70e96fb917
3 changed files with 26 additions and 0 deletions
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9
Userland/Libraries/LibC/sys/ptrace.cpp
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@ -12,6 +12,15 @@ extern "C" {
long ptrace(int request, pid_t tid, void* addr, void* data)
{
if (request == PT_PEEKBUF) {
// PT_PEEKBUF cannot easily be correctly used through this function signature:
// The amount of data to be copied is not available.
// We could VERIFY() here, but to safeguard against ports that attempt to use
// the same number, let's claim that the Kernel just doesn't know the command.
// Use Core::System::ptrace_peekbuf instead.
return EINVAL;
}
// PT_PEEK needs special handling since the syscall wrapper
// returns the peeked value as an int, which can be negative because of the cast.
// When using PT_PEEK, the user can check if an error occurred