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ptrace: Add PT_PEEK

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PT_PEEK reads a single word from the tracee's address space and returns
it to the tracer.
This commit is contained in:
Itamar 2020-04-04 11:26:56 +03:00 • committed by Andreas Kling
parent 77f671b462
commit 984ff93406
4 changed files with 28 additions and 2 deletions
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16
Kernel/Process.cpp
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@ -69,6 +69,7 @@
#include <Kernel/Time/TimeManagement.h>
#include <Kernel/VM/PageDirectory.h>
#include <Kernel/VM/PrivateInodeVMObject.h>
#include <Kernel/VM/ProcessPagingScope.h>
#include <Kernel/VM/PurgeableVMObject.h>
#include <Kernel/VM/SharedInodeVMObject.h>
#include <LibBareMetal/IO.h>
@ -4973,6 +4974,21 @@ int Process::sys$ptrace(const Syscall::SC_ptrace_params* user_params)
}
break;
}
case PT_PEEK: {
uint32_t* addr = reinterpret_cast<uint32_t*>(params.addr);
if (!MM.validate_user_read(peer->process(), VirtualAddress(addr), sizeof(uint32_t))) {
return -EFAULT;
}
uint32_t result;
SmapDisabler dis;
ProcessPagingScope scope(peer->process());
result = *addr;
return result;
break;
}
default:
return -EINVAL;