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selftests/x86/ptrace_syscall: Fix for yet more glibc interference 

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 <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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 <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2018-03-17 08:25:07 -07:00 committed by Ingo Molnar
parent bb8c13d61a
commit 4b0b37d4cc
1 changed files with 6 additions and 2 deletions
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8
tools/testing/selftests/x86/ptrace_syscall.c
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@ -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);