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Fixed ptrace 'Operation not permitted' #15287

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merged 2 commits into from Oct 16, 2019
Merged

Fixed ptrace 'Operation not permitted' #15287

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9b9f3b2
Fixed ptrace errors by avoiding attaching to an already attached proc…
yossizap Oct 16, 2019
41cd5c9
Fixed formatting
yossizap Oct 16, 2019
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44 changes: 26 additions & 18 deletions libr/debug/p/native/linux/linux_debug.c
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Expand Up @@ -54,14 +54,14 @@ char *linux_reg_profile (RDebug *dbg) {

static void linux_detach_all (RDebug *dbg);
static char *read_link (int pid, const char *file);
static int linux_attach_single_pid (RDebug *dbg, int ptid);
static bool linux_attach_single_pid (RDebug *dbg, int ptid);
static void linux_attach_all (RDebug *dbg);
static void linux_remove_thread (RDebug *dbg, int pid);
static void linux_add_and_attach_new_thread (RDebug *dbg, int tid);
static int linux_stop_process(int pid);

int linux_handle_signals (RDebug *dbg) {
siginfo_t siginfo = {0};
siginfo_t siginfo = { 0 };
int ret = r_debug_ptrace (dbg, PTRACE_GETSIGINFO, dbg->pid, 0, (r_ptrace_data_t)(size_t)&siginfo);
if (ret == -1) {
/* ESRCH means the process already went away :-/ */
Expand Down Expand Up @@ -243,6 +243,7 @@ bool linux_set_options(RDebug *dbg, int pid) {
/* SIGTRAP | 0x80 on signal handler .. not supported on all archs */
traceflags |= PTRACE_O_TRACESYSGOOD;
if (r_debug_ptrace (dbg, PTRACE_SETOPTIONS, pid, 0, (r_ptrace_data_t)(size_t)traceflags) == -1) {
perror ("ptrace (PT_SETOPTIONS)");
return false;
}
return true;
Expand Down Expand Up @@ -408,10 +409,26 @@ static int linux_stop_process(int pid) {
return ret == pid;
}

static int linux_attach_single_pid(RDebug *dbg, int ptid) {
linux_set_options (dbg, ptid);
return r_debug_ptrace (dbg, PTRACE_ATTACH, ptid, NULL,
(r_ptrace_data_t)(size_t)NULL);
static bool linux_attach_single_pid(RDebug *dbg, int ptid) {
siginfo_t sig = {0};
// Safely check if the PID has already been attached to avoid printing errors.
// Attaching to a process that has already been started with PTRACE_TRACEME.
// sets errno to "Operation not permitted" which may be misleading.
// GETSIGINFO can be called multiple times and would fail without attachment.
if (r_debug_ptrace (dbg, PTRACE_GETSIGINFO, ptid, NULL,
(r_ptrace_data_t)&sig) == -1) {
if (r_debug_ptrace (dbg, PTRACE_ATTACH, ptid, NULL,
(r_ptrace_data_t)NULL) == -1) {
perror ("ptrace (PT_ATTACH)");
return false;
}
}

if (!linux_set_options (dbg, ptid)) {
return false;
}

return true;
}

static RList *get_pid_thread_list (RDebug *dbg, int main_pid) {
Expand All @@ -424,21 +441,16 @@ static RList *get_pid_thread_list (RDebug *dbg, int main_pid) {
}

static void linux_attach_all (RDebug *dbg) {
int ret = linux_attach_single_pid (dbg, dbg->main_pid);
if (ret != -1) {
perror ("ptrace (PT_ATTACH)");
}
linux_attach_single_pid (dbg, dbg->main_pid);

RList *list = dbg->threads;
if (list) {
RDebugPid *th;
RListIter *it;
r_list_foreach (list, it, th) {
if (th->pid && th->pid != dbg->main_pid) {
ret = linux_attach_single_pid (dbg, th->pid);
if (ret == -1) {
if (!linux_attach_single_pid (dbg, th->pid)) {
eprintf ("PID %d\n", th->pid);
perror ("ptrace (PT_ATTACH)");
}
}
}
Expand All @@ -456,10 +468,7 @@ int linux_attach(RDebug *dbg, int pid) {
if (dbg->threads && !r_list_find (dbg->threads, &pid, &match_pid)) {
goto out;
}
int ret = linux_attach_single_pid (dbg, pid);
if (ret == -1) {
perror ("ptrace (PT_ATTACH)");
}
linux_attach_single_pid (dbg, pid);
}
out:
return pid;
Expand Down Expand Up @@ -881,7 +890,6 @@ int linux_reg_read(RDebug *dbg, int type, ut8 *buf, int size) {
ret = r_debug_ptrace (dbg, PTRACE_GETREGS, pid, &regs, NULL);
#else
/* linux -{arm/mips/riscv/x86/x86_64} */
eprintf ("REG READ\n");
ret = r_debug_ptrace (dbg, PTRACE_GETREGS, pid, NULL, &regs);
#endif
/*
Expand Down
39 changes: 24 additions & 15 deletions libr/io/p/io_ptrace.c
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Expand Up @@ -181,13 +181,19 @@ static bool __plugin_open(RIO *io, const char *file, bool many) {
static RIODesc *__open(RIO *io, const char *file, int rw, int mode) {
RIODesc *desc = NULL;
int ret = -1;
if (__plugin_open (io, file, 0)) {
int pid = atoi (file + 9);
// ret = r_io_ptrace (io, PTRACE_ATTACH, pid, 0, 0);
siginfo_t sig = { 0 };

if (!__plugin_open (io, file, 0)) {
return NULL;
}

int pid = atoi (file + 9);

// Safely check if the PID has already been attached to avoid printing errors.
ret = r_io_ptrace (io, PTRACE_GETSIGINFO, pid, NULL, &sig);
// Attempt attaching on failure
if (-1 == ret) {
ret = r_io_ptrace (io, PTRACE_ATTACH, pid, 0, 0);
if (file[0] == 'p') { //ptrace
ret = 0;
} else
if (ret == -1) {
#ifdef __ANDROID__
eprintf ("ptrace_attach: Operation not permitted\n");
Expand All @@ -208,17 +214,20 @@ static RIODesc *__open(RIO *io, const char *file, int rw, int mode) {
} else {
eprintf ("Error in waitpid\n");
}
if (ret != -1) {
RIOPtrace *riop = R_NEW0 (RIOPtrace);
if (!riop) {
return NULL;
}
riop->pid = riop->tid = pid;
open_pidmem (riop);
desc = r_io_desc_new (io, &r_io_plugin_ptrace, file, rw | R_PERM_X, mode, riop);
desc->name = r_sys_pid_to_path (pid);
}

if (ret != -1) {
RIOPtrace *riop = R_NEW0 (RIOPtrace);
if (!riop) {
return NULL;
}

riop->pid = riop->tid = pid;
open_pidmem (riop);
desc = r_io_desc_new (io, &r_io_plugin_ptrace, file, rw | R_PERM_X, mode, riop);
desc->name = r_sys_pid_to_path (pid);
}

return desc;
}

Expand Down