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pwtest: is_debugger_attached(): rework test

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Check if the "TracerPid" field in `/proc/self/status` is non-zero. This does
not need libcap, and does not depend on capabilities, and it also works under
qemu user emulation.
This commit is contained in:
Barnabás Pőcze 2025-07-23 18:18:52 +02:00 • committed by Wim Taymans
parent 0d0108e954
commit fcb318b9c5
3 changed files with 11 additions and 36 deletions
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3
meson.build
View file

@ -381,9 +381,6 @@ libusb_dep = dependency('libusb-1.0', required : get_option('libusb'))
summary({'libusb (Bluetooth quirks)': libusb_dep.found()}, bool_yn: true, section: 'Backend')
cdata.set('HAVE_LIBUSB', libusb_dep.found())
cap_lib = dependency('libcap', required : false)
cdata.set('HAVE_LIBCAP', cap_lib.found())
glib2_dep = dependency('glib-2.0', required : get_option('flatpak'))
summary({'GLib-2.0 (Flatpak support)': glib2_dep.found()}, bool_yn: true, section: 'Misc dependencies')
flatpak_support = glib2_dep.found()

1
test/meson.build
View file

@ -9,7 +9,6 @@ pwtest_deps = [
pipewire_dep,
mathlib,
dl_lib,
cap_lib,
epoll_shim_dep
]

43
test/pwtest.c
View file

@ -19,9 +19,6 @@
#ifdef HAVE_PIDFD_OPEN
#include <sys/syscall.h>
#endif
#ifdef HAVE_LIBCAP
#include <sys/capability.h>
#endif
#include <sys/epoll.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
@ -33,6 +30,7 @@
#include <valgrind/valgrind.h>
#include "spa/utils/ansi.h"
#include "spa/utils/cleanup.h"
#include "spa/utils/string.h"
#include "spa/utils/defs.h"
#include "spa/utils/list.h"
@ -1298,39 +1296,20 @@ static void list_tests(struct pwtest_context *ctx)
static bool is_debugger_attached(void)
{
bool rc = false;
#ifdef HAVE_LIBCAP
int status;
int pid = fork();
spa_autofree char *line = NULL;
size_t length = 0;
if (pid == -1)
return 0;
spa_autoptr(FILE) f = fopen("/proc/self/status", "re");
if (!f)
return false;
if (pid == 0) {
int ppid = getppid();
cap_t caps = cap_get_pid(ppid);
cap_flag_value_t cap_val;
if (cap_get_flag(caps, CAP_SYS_PTRACE, CAP_EFFECTIVE, &cap_val) == -1 ||
cap_val != CAP_SET)
_exit(false);
if (ptrace(PTRACE_ATTACH, ppid, NULL, 0) == 0) {
waitpid(ppid, NULL, 0);
ptrace(PTRACE_CONT, ppid, NULL, 0);
ptrace(PTRACE_DETACH, ppid, NULL, 0);
rc = false;
} else {
rc = true;
}
_exit(rc);
} else {
waitpid(pid, &status, 0);
rc = WEXITSTATUS(status);
while (getline(&line, &length, f) >= 0) {
unsigned int tracer_pid;
if (sscanf(line, "TracerPid: %u", &tracer_pid) == 1)
return tracer_pid > 0;
}
#endif
return !!rc;
return false;
}
static void usage(FILE *fp, const char *progname)