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set trace options in PTRACE_SEIZE and remove unnecessary PTRACE_SETOPTIONS

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This commit is contained in:
Nikita Smith
2025-11-27 15:45:36 -08:00
parent 1602a9e6ea
commit f8f3f95d33
2 changed files with 21 additions and 42 deletions
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src/demon/linux/demon_core_linux.c
+21 -41
View File
@@ -2113,9 +2113,6 @@ dmn_ctrl_launch(DMN_CtrlCtx *ctx, OS_ProcessLaunchParams *params)
// change work directory to tracee
if(OS_LNX_RETRY_ON_EINTR(chdir(work_dir_path)) < 0) { goto child_exit; }
// @first_sigstop notify parent that we are going to execve
if(OS_LNX_RETRY_ON_EINTR(raise(SIGSTOP)) < 0) { goto child_exit; }
// replace process with target program
if(OS_LNX_RETRY_ON_EINTR(execve(argv[0], argv, envp)) < 0) { goto child_exit; }
@@ -2128,7 +2125,9 @@ dmn_ctrl_launch(DMN_CtrlCtx *ctx, OS_ProcessLaunchParams *params)
B32 failed_to_seize = 1;
// try to seize child process
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SEIZE, pid, 0, 0) < 0)) { goto parent_exit; }
//
// TODO: PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SEIZE, pid, 0, PTRACE_O_TRACEEXEC | PTRACE_O_EXITKILL | PTRACE_O_TRACECLONE) < 0)) { goto parent_exit; }
// ensure tracer ops are issued on thread that sizes processes
if(dmn_lnx_state->tracer_tid == 0) { dmn_lnx_state->tracer_tid = gettid(); }
@@ -2140,7 +2139,7 @@ dmn_ctrl_launch(DMN_CtrlCtx *ctx, OS_ProcessLaunchParams *params)
else { pending_proc = push_array(dmn_lnx_state->arena, DMN_LNX_ProcessLaunch, 1); }
// add pending proc node to the list
*pending_proc = (DMN_LNX_ProcessLaunch){ params->debug_subprocesses, pid, DMN_LNX_ProcessLaunchState_SigStop };
*pending_proc = (DMN_LNX_ProcessLaunch){ params->debug_subprocesses, pid, DMN_LNX_ProcessLaunchState_Exec };
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->pending_procs, pending_proc);
// tracee was successfully seized
@@ -2414,52 +2413,33 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
// process unexpectedly exited
if(wifexited) { pending_proc->state = DMN_LNX_ProcessLaunchState_Exit; }
if(pending_proc->state == DMN_LNX_ProcessLaunchState_Exec && wstopsig == SIGTRAP && event_code == PTRACE_EVENT_EXEC)
if(pending_proc->state == DMN_LNX_ProcessLaunchState_Exec)
{
// move pending process node to the free list
dmn_lnx_process_launch_list_remove(&dmn_lnx_state->pending_procs, pending_proc);
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->free_pids, pending_proc);
// push create process events
dmn_lnx_handle_create_process(arena, &events, pending_proc->debug_subprocesses, wait_id);
// override event code so the main code path does not create another process
event_code = PTRACE_EVENT_STOP;
}
else
{
B32 shutdown_process = 1;
if(pending_proc->state == DMN_LNX_ProcessLaunchState_SigStop && wstopsig == SIGSTOP) // @first_sigstop
{
// set trace options and singal to proceed to the execve
//
// TODO: PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFROK | PTRACE_O_TRACEVFORKDONE
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SETOPTIONS, wait_id, 0, (void *)(PTRACE_O_EXITKILL | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE))) >= 0)
{
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_CONT, wait_id, 0, 0)) >= 0)
{
// update pending process state
pending_proc->state = DMN_LNX_ProcessLaunchState_Exec;
shutdown_process = 0;
}
}
}
else if(pending_proc->state == DMN_LNX_ProcessLaunchState_Exit)
if(wstopsig == SIGTRAP && event_code == PTRACE_EVENT_EXEC)
{
// move pending process node to the free list
dmn_lnx_process_launch_list_remove(&dmn_lnx_state->pending_procs, pending_proc);
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->free_pids, pending_proc);
shutdown_process = 0;
}
// exit on abnormal process init
if(shutdown_process)
// push create process events
dmn_lnx_handle_create_process(arena, &events, pending_proc->debug_subprocesses, wait_id);
// override event code so the main code path does not create another process
event_code = PTRACE_EVENT_STOP;
}
else
{
// shutdown process on abnormal init
OS_LNX_RETRY_ON_EINTR(kill(wait_id, SIGKILL));
pending_proc->state = DMN_LNX_ProcessLaunchState_Exit;
continue;
}
}
else if(pending_proc->state == DMN_LNX_ProcessLaunchState_Exit)
{
// move pending process node to the free list
dmn_lnx_process_launch_list_remove(&dmn_lnx_state->pending_procs, pending_proc);
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->free_pids, pending_proc);
continue;
}
}
src/demon/linux/demon_core_linux.h
-1
View File
@@ -252,7 +252,6 @@ typedef U32 DMN_LNX_ProcessLaunchState;
enum
{
DMN_LNX_ProcessLaunchState_Null,
DMN_LNX_ProcessLaunchState_SigStop,
DMN_LNX_ProcessLaunchState_Exec,
DMN_LNX_ProcessLaunchState_Exit,
};