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WIP handle abnormal process initialization

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This commit is contained in:
Nikita Smith
2025-11-25 16:24:57 -08:00
parent 0565fdef0a
commit a1884aaf5f
2 changed files with 133 additions and 114 deletions
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src/demon/linux/demon_core_linux.c
+115 -106
View File
@@ -1438,25 +1438,10 @@ dmn_lnx_handle_create_thread(Arena *arena, DMN_EventList *events, DMN_LNX_Entity
}
internal void
dmn_lnx_handle_create_process(Arena *arena, DMN_EventList *events, pid_t pid)
dmn_lnx_handle_create_process(Arena *arena, DMN_EventList *events, B32 debug_subprocesses, pid_t pid)
{
Temp scratch = scratch_begin(&arena, 1);
//
// move pid to the active list
//
B32 debug_subprocesses = 0;
for EachNode(n, DMN_LNX_ProcessLaunch, dmn_lnx_state->pending_creation.first)
{
if(n->pid == pid)
{
dmn_lnx_process_launch_list_remove(&dmn_lnx_state->pending_creation, n);
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->free_pids, n);
debug_subprocesses = n->debug_subprocesses;
break;
}
}
ELF_Hdr64 exe_ehdr = dmn_lnx_ehdr_from_pid(pid);
int memory_fd = open((char*)str8f(scratch.arena, "/proc/%d/mem", pid).str, O_RDWR);
DMN_LNX_ProcessAuxv auxv = dmn_lnx_auxv_from_pid(pid, exe_ehdr.e_ident[ELF_Identifier_Class]);
@@ -1559,7 +1544,6 @@ dmn_lnx_handle_create_process(Arena *arena, DMN_EventList *events, pid_t pid)
process->xcr0 = xcr0;
process->xsave_size = Max(xsave_size, sizeof(X64_XSave));
process->xsave_layout = xsave_layout;
process->thread_count = 1;
MemoryCopyTyped(&process->probe_vaddrs[0], &probe_vaddrs[0], DMN_LNX_ProbeType_Count);
hash_table_push_u64_raw(dmn_lnx_state->arena, dmn_lnx_state->pid_ht, pid, process);
// push create process event
@@ -2091,11 +2075,9 @@ dmn_ctrl_launch(DMN_CtrlCtx *ctx, OS_ProcessLaunchParams *params)
{
Temp scratch = scratch_begin(0, 0);
pid_t pid = 0;
//- rjf: unpack command line
int argc = (int)(params->cmd_line.node_count);
char **argv = push_array(scratch.arena, char *, argc+1);
// setup target command line
U64 argc = params->cmd_line.node_count + 1;
char **argv = push_array(scratch.arena, char *, argc);
{
U64 idx = 0;
for(String8Node *n = params->cmd_line.first; n != 0; n = n->next, idx += 1)
@@ -2104,82 +2086,78 @@ dmn_ctrl_launch(DMN_CtrlCtx *ctx, OS_ProcessLaunchParams *params)
}
}
//- rjf: unpack path
char *path = (char *)push_str8_copy(scratch.arena, params->path).str;
//- rjf: unpack environment
char **env = push_array(scratch.arena, char *, os_lnx_state.default_env_count + params->env.node_count + 1);
// setup target environment
U64 envc = os_lnx_state.default_env_count + params->env.node_count + 1;
char **envp = push_array(scratch.arena, char *, envc);
{
MemoryCopyTyped(env, os_lnx_state.default_env, os_lnx_state.default_env_count);
// copy default environment
MemoryCopyTyped(envp, os_lnx_state.default_env, os_lnx_state.default_env_count);
// copy user environment
U64 idx = os_lnx_state.default_env_count;
for(String8Node *n = params->env.first; n != 0; n = n->next, idx += 1)
{
env[idx] = (char *)push_str8_copy(scratch.arena, n->string).str;
envp[idx] = (char *)push_str8_copy(scratch.arena, n->string).str;
}
}
//- rjf: fork
pid = fork();
// create zero-terminated work directory path
char *work_dir_path = (char *)push_str8_copy(scratch.arena, params->path).str;
// fork process
pid_t pid = fork();
// child process
if(pid == 0)
{
// set current working directory to tracee
if(OS_LNX_RETRY_ON_EINTR(chdir(path)) < 0) { goto child_exit; }
// change work directory to tracee
if(OS_LNX_RETRY_ON_EINTR(chdir(work_dir_path)) < 0) { goto child_exit; }
// notify parent that we are going to execve
OS_LNX_RETRY_ON_EINTR(raise(SIGSTOP));
// @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
OS_LNX_RETRY_ON_EINTR(execve(argv[0], argv, env));
// replace process with target program
if(OS_LNX_RETRY_ON_EINTR(execve(argv[0], argv, envp)) < 0) { goto child_exit; }
// execve failed -- exit
child_exit:;
abort();
}
// parent process
else if(pid > 0)
{
B32 kill_child_process = 1;
B32 failed_to_seize = 1;
// try to seize child process
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SEIZE, pid, 0, 0) < 0)) { Assert(0 && "failed to seize"); goto parent_exit; }
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SEIZE, pid, 0, 0) < 0)) { goto parent_exit; }
if(dmn_lnx_state->tracer_tid == 0)
{
dmn_lnx_state->tracer_tid = gettid();
}
else
{
AssertAlways(dmn_lnx_state->tracer_tid == gettid());
}
// ensure tracer ops are issued on thread that sizes processes
if(dmn_lnx_state->tracer_tid == 0) { dmn_lnx_state->tracer_tid = gettid(); }
AssertAlways(dmn_lnx_state->tracer_tid == gettid());
// alloc pid node
DMN_LNX_ProcessLaunch *pending_stopsig = dmn_lnx_state->free_pids.first;
if(pending_stopsig) { dmn_lnx_process_launch_list_remove(&dmn_lnx_state->free_pids, pending_stopsig); }
else { pending_stopsig = push_array(dmn_lnx_state->arena, DMN_LNX_ProcessLaunch, 1); }
// alloc pending process node
DMN_LNX_ProcessLaunch *pending_proc = dmn_lnx_state->free_pids.first;
if(pending_proc) { dmn_lnx_process_launch_list_remove(&dmn_lnx_state->free_pids, pending_proc); }
else { pending_proc = push_array(dmn_lnx_state->arena, DMN_LNX_ProcessLaunch, 1); }
// add to list
pending_stopsig->debug_subprocesses = params->debug_subprocesses;
pending_stopsig->pid = pid;
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->pending_stopsig, pending_stopsig);
// add pending proc node to the list
*pending_proc = (DMN_LNX_ProcessLaunch){ params->debug_subprocesses, pid, DMN_LNX_ProcessLaunchState_SigStop };
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->pending_procs, pending_proc);
// tracee was successfully sizeed
kill_child_process = 0;
// tracee was successfully seized
failed_to_seize = 0;
parent_exit:;
if(kill_child_process)
if(failed_to_seize)
{
Assert(0 && "failed to ptrace child process");
if(OS_LNX_RETRY_ON_EINTR(kill(SIGKILL, pid)) < 0) { Assert(0 && "failed to kill child process"); }
OS_LNX_RETRY_ON_EINTR(kill(SIGKILL, pid));
OS_LNX_RETRY_ON_EINTR(waitpid(pid, 0, WNOHANG));
pid = 0;
}
}
scratch_end(scratch);
Assert(pid < max_U32);
return (U32)pid;
return pid;
}
internal B32
@@ -2394,31 +2372,30 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
// wait for signals from the running threads
{
U64 stopped_threads = 0;
B32 is_halt_done = 0;
do
B32 is_halt_done = 0;
for(U64 stopped_threads = 0;;)
{
// do not wait if there are no processes
if(dmn_lnx_state->pending_stopsig.count == 0 && dmn_lnx_state->pending_creation.count == 0 && dmn_lnx_state->active_process_count == 0)
// do not wait if there are no pending or active processes
if(dmn_lnx_state->pending_procs.count == 0 && dmn_lnx_state->active_process_count == 0)
{
dmn_lnx_handle_not_attached(arena, &events);
break;
}
mutex_drop(dmn_lnx_state->halter_mutex);
// wait for a signal
int status = 0;
pid_t wait_id = 0;
for(;;)
{
wait_id = OS_LNX_RETRY_ON_EINTR(waitpid(-1, &status, __WALL|__WNOTHREAD));
if(wait_id == -1) { InvalidPath; } // TODO: graceful exit
break;
mutex_drop(dmn_lnx_state->halter_mutex);
for(;;)
{
wait_id = OS_LNX_RETRY_ON_EINTR(waitpid(-1, &status, __WALL|__WNOTHREAD));
if(wait_id == -1) { InvalidPath; } // TODO: graceful exit
break;
}
mutex_take(dmn_lnx_state->halter_mutex);
}
mutex_take(dmn_lnx_state->halter_mutex);
// unpack status
int wifexited = WIFEXITED(status);
int wifsignaled = WIFSIGNALED(status);
@@ -2426,32 +2403,66 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
int wstopsig = WSTOPSIG(status);
int event_code = (status >> 16);
// intercept our SIGSTOP and signal tracee to continue to execve
if(wstopsig == SIGSTOP)
// intercept signals meant for the process launch sequence
{
B32 is_pending_launch = 0;
for EachNode(n, DMN_LNX_ProcessLaunch, dmn_lnx_state->pending_stopsig.first)
// pid -> pending process launch
DMN_LNX_ProcessLaunch *pending_proc = 0;
for EachNode(n, DMN_LNX_ProcessLaunch, dmn_lnx_state->pending_procs.first) { if(n->pid == wait_id) { pending_proc = n; break; } }
if(pending_proc)
{
if(n->pid == wait_id)
// 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)
{
// move node to the pending creation list
dmn_lnx_process_launch_list_remove(&dmn_lnx_state->pending_stopsig, n);
dmn_lnx_process_launch_list_push_node(&dmn_lnx_state->pending_creation, n);
// 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);
// set trace options
// TODO: PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFROK | PTRACE_O_TRACEVFORKDONE
void *trace_options = (void *)(PTRACE_O_EXITKILL | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE);
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SETOPTIONS, wait_id, 0, trace_options)) < 0) { Assert(0 && "failed to set options"); InvalidPath; }
// push create process events
dmn_lnx_handle_create_process(arena, &events, pending_proc->debug_subprocesses, wait_id);
// signal process to continue to execve
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_CONT, wait_id, 0, 0)) < 0) { InvalidPath; }
// override event code so the main code path does not create another process
event_code = PTRACE_EVENT_STOP;
}
else
{
B32 shutdown_process = 1;
is_pending_launch = 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)
{
// 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;
}
break;
// exit on abnormal process init
if(shutdown_process)
{
OS_LNX_RETRY_ON_EINTR(kill(wait_id, SIGKILL));
pending_proc->state = DMN_LNX_ProcessLaunchState_Exit;
}
continue;
}
}
if(is_pending_launch) { continue; }
}
if(wifstopped || wifsignaled || wifexited)
@@ -2561,26 +2572,18 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
{
DMN_LNX_Entity *thread = dmn_lnx_thread_from_pid(wait_id);
DMN_LNX_Entity *process = thread->parent;
if(process == dmn_lnx_nil_entity)
if(process->debug_subprocesses)
{
dmn_lnx_handle_create_process(arena, &events, wait_id);
dmn_lnx_handle_exit_thread(arena, &events, wait_id, 0);
dmn_lnx_handle_create_process(arena, &events, 1, wait_id);
}
else
{
if(process->debug_subprocesses)
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_DETACH, wait_id, 0, 0)) >= 0)
{
dmn_lnx_handle_exit_thread(arena, &events, wait_id, 0);
dmn_lnx_handle_create_process(arena, &events, wait_id);
}
else
{
if(OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_DETACH, wait_id, 0, 0)) >= 0)
{
dmn_lnx_handle_exit_thread(arena, &events, wait_id, 0);
}
else { Assert(0 && "failed to detach"); }
}
else { Assert(0 && "failed to detach"); }
}
}break;
case PTRACE_EVENT_VFORK_DONE:
@@ -2630,7 +2633,13 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
}
}
else { Assert(0 && "unexpected stop code"); }
} while(stopped_threads < running_threads.count);
// do not wait if all threads are stopped and there are no launching processes
if(stopped_threads >= running_threads.count && dmn_lnx_state->pending_procs.count == 0)
{
break;
}
}
// finalize halter state
if(is_halt_done)
src/demon/linux/demon_core_linux.h
+17 -7
View File
@@ -248,11 +248,22 @@ struct DMN_LNX_EntityList
////////////////////////////////
//~ rjf: Main State Bundle
typedef U32 DMN_LNX_ProcessLaunchState;
enum
{
DMN_LNX_ProcessLaunchState_Null,
DMN_LNX_ProcessLaunchState_SigStop,
DMN_LNX_ProcessLaunchState_Exec,
DMN_LNX_ProcessLaunchState_Exit,
};
typedef struct DMN_LNX_ProcessLaunch DMN_LNX_ProcessLaunch;
struct DMN_LNX_ProcessLaunch
{
B32 debug_subprocesses;
pid_t pid;
B32 debug_subprocesses;
pid_t pid;
DMN_LNX_ProcessLaunchState state;
DMN_LNX_ProcessLaunch *next;
DMN_LNX_ProcessLaunch *prev;
};
@@ -286,14 +297,13 @@ struct DMN_LNX_State
DMN_LNX_Entity *entities_base;
DMN_LNX_Entity *free_entity;
U64 entities_count;
HashTable *tid_ht; // thread id -> thread entity
HashTable *pid_ht; // process id -> process entity
HashTable *tid_ht; // thread id -> thread entity
HashTable *pid_ht; // process id -> process entity
// pid tracking
U64 active_process_count;
DMN_LNX_ProcessLaunchList pending_stopsig;
DMN_LNX_ProcessLaunchList pending_creation;
DMN_LNX_ProcessLaunchList active_pids;
DMN_LNX_ProcessLaunchList pending_procs;
DMN_LNX_ProcessLaunchList free_pids;
// halter