/* Darwin support for GDB, the GNU debugger.
- Copyright (C) 2008-2018 Free Software Foundation, Inc.
+ Copyright (C) 2008-2019 Free Software Foundation, Inc.
Contributed by AdaCore.
#include "arch-utils.h"
#include "bfd.h"
#include "bfd/mach-o.h"
+#include "gdbarch.h"
+#include <copyfile.h>
#include <sys/ptrace.h>
#include <sys/signal.h>
#include <setjmp.h>
#include <mach/port.h>
#include "darwin-nat.h"
-#include "common/filestuff.h"
+#include "filenames.h"
+#include "gdbsupport/filestuff.h"
+#include "gdbsupport/gdb_unlinker.h"
+#include "gdbsupport/pathstuff.h"
+#include "gdbsupport/scoped_fd.h"
#include "nat/fork-inferior.h"
/* Quick overview.
/* Inferior that should report a fake stop event. */
static struct inferior *darwin_inf_fake_stop;
+/* If non-NULL, the shell we actually invoke. See maybe_cache_shell
+ for details. */
+static const char *copied_shell;
+
#define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1))
#define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1)
/* Not a known inferior. This could happen if the child fork, as
the created process will inherit its exception port.
FIXME: should the exception port be restored ? */
- kern_return_t kret;
mig_reply_error_t reply;
inferior_debug
if (!priv->no_ptrace)
{
- pid_t res;
+ pid_t res_pid;
int wstatus;
- res = wait4 (inf->pid, &wstatus, 0, NULL);
- if (res < 0 || res != inf->pid)
+ res_pid = wait4 (inf->pid, &wstatus, 0, NULL);
+ if (res_pid < 0 || res_pid != inf->pid)
{
printf_unfiltered (_("wait4: res=%d: %s\n"),
- res, safe_strerror (errno));
+ res_pid, safe_strerror (errno));
status->kind = TARGET_WAITKIND_IGNORE;
return minus_one_ptid;
}
}
inferior_debug (4, _("darwin_wait: pid=%d exit, status=0x%x\n"),
- res, wstatus);
+ res_pid, wstatus);
/* Looks necessary on Leopard and harmless... */
wait4 (inf->pid, &wstatus, 0, NULL);
signaled thus darwin_decode_message function knows that the kill
signal was sent by gdb and will take the appropriate action
(cancel signal and reply to the signal message). */
- darwin_inferior *priv = get_darwin_inferior (inf);
for (darwin_thread_t *thread : priv->threads)
thread->signaled = 1;
darwin_inferior *priv = new darwin_inferior;
inf->priv.reset (priv);
- TRY
+ try
{
kret = task_for_pid (gdb_task, inf->pid, &priv->task);
if (kret != KERN_SUCCESS)
darwin_setup_exceptions (inf);
}
- CATCH (ex, RETURN_MASK_ALL)
+ catch (const gdb_exception &ex)
{
exit_inferior (inf);
inferior_ptid = null_ptid;
- throw_exception (ex);
+ throw;
}
- END_CATCH
target_ops *darwin_ops = get_native_target ();
if (!target_is_pushed (darwin_ops))
static struct thread_info *
thread_info_from_private_thread_info (darwin_thread_info *pti)
{
- struct thread_info *it;
-
- ALL_THREADS (it)
+ for (struct thread_info *it : all_threads ())
{
darwin_thread_info *iter_pti = get_darwin_thread_info (it);
if (iter_pti->gdb_port == pti->gdb_port)
- break;
+ return it;
}
- gdb_assert (it != NULL);
-
- return it;
+ gdb_assert_not_reached ("did not find gdb thread for darwin thread");
}
static void
posix_spawnp (NULL, argv[0], NULL, &attr, argv, env);
}
-/* Read kernel version, and return TRUE on Sierra or later. */
+/* Read kernel version, and return TRUE if this host may have System
+ Integrity Protection (Sierra or later). */
static bool
-should_disable_startup_with_shell ()
+may_have_sip ()
{
char str[16];
size_t sz = sizeof (str);
return false;
}
+/* A helper for maybe_cache_shell. This copies the shell to the
+ cache. It will throw an exception on any failure. */
+
+static void
+copy_shell_to_cache (const char *shell, const std::string &new_name)
+{
+ scoped_fd from_fd (gdb_open_cloexec (shell, O_RDONLY, 0));
+ if (from_fd.get () < 0)
+ error (_("Could not open shell (%s) for reading: %s"),
+ shell, safe_strerror (errno));
+
+ std::string new_dir = ldirname (new_name.c_str ());
+ if (!mkdir_recursive (new_dir.c_str ()))
+ error (_("Could not make cache directory \"%s\": %s"),
+ new_dir.c_str (), safe_strerror (errno));
+
+ gdb::char_vector temp_name = make_temp_filename (new_name);
+ scoped_fd to_fd (gdb_mkostemp_cloexec (&temp_name[0]));
+ gdb::unlinker unlink_file_on_error (temp_name.data ());
+
+ if (to_fd.get () < 0)
+ error (_("Could not open temporary file \"%s\" for writing: %s"),
+ temp_name.data (), safe_strerror (errno));
+
+ if (fcopyfile (from_fd.get (), to_fd.get (), nullptr,
+ COPYFILE_STAT | COPYFILE_DATA) != 0)
+ error (_("Could not copy shell to cache as \"%s\": %s"),
+ temp_name.data (), safe_strerror (errno));
+
+ /* Be sure that the caching is atomic so that we don't get bad
+ results from multiple copies of gdb running at the same time. */
+ if (rename (temp_name.data (), new_name.c_str ()) != 0)
+ error (_("Could not rename shell cache file to \"%s\": %s"),
+ new_name.c_str (), safe_strerror (errno));
+
+ unlink_file_on_error.keep ();
+}
+
+/* If $SHELL is restricted, try to cache a copy. Starting with El
+ Capitan, macOS introduced System Integrity Protection. Among other
+ things, this prevents certain executables from being ptrace'd. In
+ particular, executables in /bin, like most shells, are affected.
+ To work around this, while preserving command-line glob expansion
+ and redirections, gdb will cache a copy of the shell. Return true
+ if all is well -- either the shell is not subject to SIP or it has
+ been successfully cached. Returns false if something failed. */
+
+static bool
+maybe_cache_shell ()
+{
+ /* SF_RESTRICTED is defined in sys/stat.h and lets us determine if a
+ given file is subject to SIP. */
+#ifdef SF_RESTRICTED
+
+ /* If a check fails we want to revert -- maybe the user deleted the
+ cache while gdb was running, or something like that. */
+ copied_shell = nullptr;
+
+ const char *shell = get_shell ();
+ if (!IS_ABSOLUTE_PATH (shell))
+ {
+ warning (_("This version of macOS has System Integrity Protection.\n\
+Normally gdb would try to work around this by caching a copy of your shell,\n\
+but because your shell (%s) is not an absolute path, this is being skipped."),
+ shell);
+ return false;
+ }
+
+ struct stat sb;
+ if (stat (shell, &sb) < 0)
+ {
+ warning (_("This version of macOS has System Integrity Protection.\n\
+Normally gdb would try to work around this by caching a copy of your shell,\n\
+but because gdb could not stat your shell (%s), this is being skipped.\n\
+The error was: %s"),
+ shell, safe_strerror (errno));
+ return false;
+ }
+
+ if ((sb.st_flags & SF_RESTRICTED) == 0)
+ return true;
+
+ /* Put the copy somewhere like ~/Library/Caches/gdb/bin/sh. */
+ std::string new_name = get_standard_cache_dir ();
+ /* There's no need to insert a directory separator here, because
+ SHELL is known to be absolute. */
+ new_name.append (shell);
+
+ /* Maybe it was cached by some earlier gdb. */
+ if (stat (new_name.c_str (), &sb) != 0 || !S_ISREG (sb.st_mode))
+ {
+ try
+ {
+ copy_shell_to_cache (shell, new_name);
+ }
+ catch (const gdb_exception_error &ex)
+ {
+ warning (_("This version of macOS has System Integrity Protection.\n\
+Because `startup-with-shell' is enabled, gdb tried to work around SIP by\n\
+caching a copy of your shell. However, this failed:\n\
+%s\n\
+If you correct the problem, gdb will automatically try again the next time\n\
+you \"run\". To prevent these attempts, you can use:\n\
+ set startup-with-shell off"),
+ ex.what ());
+ return false;
+ }
+
+ printf_filtered (_("Note: this version of macOS has System Integrity Protection.\n\
+Because `startup-with-shell' is enabled, gdb has worked around this by\n\
+caching a copy of your shell. The shell used by \"run\" is now:\n\
+ %s\n"),
+ new_name.c_str ());
+ }
+
+ /* We need to make sure that the new name has the correct lifetime. */
+ static std::string saved_shell = std::move (new_name);
+ copied_shell = saved_shell.c_str ();
+
+#endif /* SF_RESTRICTED */
+
+ return true;
+}
+
void
darwin_nat_target::create_inferior (const char *exec_file,
const std::string &allargs,
{
gdb::optional<scoped_restore_tmpl<int>> restore_startup_with_shell;
- if (startup_with_shell && should_disable_startup_with_shell ())
+ if (startup_with_shell && may_have_sip ())
{
- warning (_("startup-with-shell not supported on this macOS version,"
- " disabling it."));
- restore_startup_with_shell.emplace (&startup_with_shell, 0);
+ if (!maybe_cache_shell ())
+ {
+ warning (_("startup-with-shell is now temporarily disabled"));
+ restore_startup_with_shell.emplace (&startup_with_shell, 0);
+ }
}
/* Do the hard work. */
fork_inferior (exec_file, allargs, env, darwin_ptrace_me,
- darwin_ptrace_him, darwin_pre_ptrace, NULL,
+ darwin_ptrace_him, darwin_pre_ptrace, copied_shell,
darwin_execvp);
}
\f
if (exec_file)
printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file,
- target_pid_to_str (ptid_t (pid)));
+ target_pid_to_str (ptid_t (pid)).c_str ());
else
printf_unfiltered (_("Attaching to %s\n"),
- target_pid_to_str (ptid_t (pid)));
-
- gdb_flush (gdb_stdout);
+ target_pid_to_str (ptid_t (pid)).c_str ());
}
if (pid == 0 || ::kill (pid, 0) < 0)
mourn_inferior ();
}
-const char *
+std::string
darwin_nat_target::pid_to_str (ptid_t ptid)
{
- static char buf[80];
long tid = ptid.tid ();
if (tid != 0)
- {
- snprintf (buf, sizeof (buf), _("Thread 0x%lx of process %u"),
- tid, ptid.pid ());
- return buf;
- }
+ return string_printf (_("Thread 0x%lx of process %u"),
+ tid, ptid.pid ());
return normal_pid_to_str (ptid);
}
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