From: Andy Lutomirski Date: Sat, 17 Mar 2018 15:25:07 +0000 (-0700) Subject: selftests/x86/ptrace_syscall: Fix for yet more glibc interference X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=852d9679a778595fd818aaaca4b4b1c3124e0f6b;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git selftests/x86/ptrace_syscall: Fix for yet more glibc interference commit 4b0b37d4cc54b21a6ecad7271cbc850555869c62 upstream. glibc keeps getting cleverer, and my version now turns raise() into more than one syscall. Since the test relies on ptrace seeing an exact set of syscalls, this breaks the test. Replace raise(SIGSTOP) with syscall(SYS_tgkill, ...) to force glibc to get out of our way. Signed-off-by: Andy Lutomirski Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kselftest@vger.kernel.org Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/bc80338b453afa187bc5f895bd8e2c8d6e264da2.1521300271.git.luto@kernel.org Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- diff --git a/tools/testing/selftests/x86/ptrace_syscall.c b/tools/testing/selftests/x86/ptrace_syscall.c index 1ae1c5a7392e..6f22238f3217 100644 --- a/tools/testing/selftests/x86/ptrace_syscall.c +++ b/tools/testing/selftests/x86/ptrace_syscall.c @@ -183,8 +183,10 @@ static void test_ptrace_syscall_restart(void) if (ptrace(PTRACE_TRACEME, 0, 0, 0) != 0) err(1, "PTRACE_TRACEME"); + pid_t pid = getpid(), tid = syscall(SYS_gettid); + printf("\tChild will make one syscall\n"); - raise(SIGSTOP); + syscall(SYS_tgkill, pid, tid, SIGSTOP); syscall(SYS_gettid, 10, 11, 12, 13, 14, 15); _exit(0); @@ -301,9 +303,11 @@ static void test_restart_under_ptrace(void) if (ptrace(PTRACE_TRACEME, 0, 0, 0) != 0) err(1, "PTRACE_TRACEME"); + pid_t pid = getpid(), tid = syscall(SYS_gettid); + printf("\tChild will take a nap until signaled\n"); setsigign(SIGUSR1, SA_RESTART); - raise(SIGSTOP); + syscall(SYS_tgkill, pid, tid, SIGSTOP); syscall(SYS_pause, 0, 0, 0, 0, 0, 0); _exit(0);