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Kernel: Add 'ptrace' syscall

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This commit adds a basic implementation of
the ptrace syscall, which allows one process
(the tracer) to control another process (the tracee).

While a process is being traced, it is stopped whenever a signal is
received (other than SIGCONT).

The tracer can start tracing another thread with PT_ATTACH,
which causes the tracee to stop.

From there, the tracer can use PT_CONTINUE
to continue the execution of the tracee,
or use other request codes (which haven't been implemented yet)
to modify the state of the tracee.

Additional request codes are PT_SYSCALL, which causes the tracee to
continue exection but stop at the next entry or exit from a syscall,
and PT_GETREGS which fethces the last saved register set of the tracee
(can be used to inspect syscall arguments and return value).

A special request code is PT_TRACE_ME, which is issued by the tracee
and causes it to stop when it calls execve and wait for the
tracer to attach.
This commit is contained in:
Itamar 2020-03-28 11:47:16 +03:00 • committed by Andreas Kling
parent c9396be83f
commit 6b74d38aab
13 changed files with 300 additions and 102 deletions
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11
Kernel/Syscall.h
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@ -133,7 +133,6 @@ namespace Kernel {
__ENUMERATE_SYSCALL(donate) \
__ENUMERATE_SYSCALL(rename) \
__ENUMERATE_SYSCALL(ftruncate) \
__ENUMERATE_SYSCALL(systrace) \
__ENUMERATE_SYSCALL(exit_thread) \
__ENUMERATE_SYSCALL(mknod) \
__ENUMERATE_SYSCALL(writev) \
@ -182,7 +181,8 @@ namespace Kernel {
__ENUMERATE_SYSCALL(unveil) \
__ENUMERATE_SYSCALL(perf_event) \
__ENUMERATE_SYSCALL(shutdown) \
__ENUMERATE_SYSCALL(get_stack_bounds)
__ENUMERATE_SYSCALL(get_stack_bounds) \
__ENUMERATE_SYSCALL(ptrace)
namespace Syscall {
@ -424,6 +424,13 @@ struct SC_stat_params {
bool follow_symlinks;
};
struct SC_ptrace_params {
int request;
pid_t pid;
u8* addr;
int data;
};
void initialize();
int sync();