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linux_dsm_epyc7002/tools/testing/selftests/x86/ptrace_syscall.c
Andy Lutomirski 4b0b37d4cc 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>
2018-03-19 09:06:15 +01:00

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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include <sys/user.h>
#include <unistd.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <err.h>
#include <string.h>
#include <asm/ptrace-abi.h>
#include <sys/auxv.h>
/* Bitness-agnostic defines for user_regs_struct fields. */
#ifdef __x86_64__
# define user_syscall_nr orig_rax
# define user_arg0 rdi
# define user_arg1 rsi
# define user_arg2 rdx
# define user_arg3 r10
# define user_arg4 r8
# define user_arg5 r9
# define user_ip rip
# define user_ax rax
#else
# define user_syscall_nr orig_eax
# define user_arg0 ebx
# define user_arg1 ecx
# define user_arg2 edx
# define user_arg3 esi
# define user_arg4 edi
# define user_arg5 ebp
# define user_ip eip
# define user_ax eax
#endif
static int nerrs = 0;
struct syscall_args32 {
uint32_t nr, arg0, arg1, arg2, arg3, arg4, arg5;
};
#ifdef __i386__
extern void sys32_helper(struct syscall_args32 *, void *);
extern void int80_and_ret(void);
#endif
/*
* Helper to invoke int80 with controlled regs and capture the final regs.
*/
static void do_full_int80(struct syscall_args32 *args)
{
#ifdef __x86_64__
register unsigned long bp asm("bp") = args->arg5;
asm volatile ("int $0x80"
: "+a" (args->nr),
"+b" (args->arg0), "+c" (args->arg1), "+d" (args->arg2),
"+S" (args->arg3), "+D" (args->arg4), "+r" (bp)
: : "r8", "r9", "r10", "r11");
args->arg5 = bp;
#else
sys32_helper(args, int80_and_ret);
#endif
}
#ifdef __i386__
static void (*vsyscall32)(void);
/*
* Nasty helper to invoke AT_SYSINFO (i.e. __kernel_vsyscall) with
* controlled regs and capture the final regs. This is so nasty that it
* crashes my copy of gdb :)
*/
static void do_full_vsyscall32(struct syscall_args32 *args)
{
sys32_helper(args, vsyscall32);
}
#endif
static siginfo_t wait_trap(pid_t chld)
{
siginfo_t si;
if (waitid(P_PID, chld, &si, WEXITED|WSTOPPED) != 0)
err(1, "waitid");
if (si.si_pid != chld)
errx(1, "got unexpected pid in event\n");
if (si.si_code != CLD_TRAPPED)
errx(1, "got unexpected event type %d\n", si.si_code);
return si;
}
static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
int flags)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = handler;
sa.sa_flags = SA_SIGINFO | flags;
sigemptyset(&sa.sa_mask);
if (sigaction(sig, &sa, 0))
err(1, "sigaction");
}
static void setsigign(int sig, int flags)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = (void *)SIG_IGN;
sa.sa_flags = flags;
sigemptyset(&sa.sa_mask);
if (sigaction(sig, &sa, 0))
err(1, "sigaction");
}
static void clearhandler(int sig)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
if (sigaction(sig, &sa, 0))
err(1, "sigaction");
}
#ifdef __x86_64__
# define REG_BP REG_RBP
#else
# define REG_BP REG_EBP
#endif
static void empty_handler(int sig, siginfo_t *si, void *ctx_void)
{
}
static void test_sys32_regs(void (*do_syscall)(struct syscall_args32 *))
{
struct syscall_args32 args = {
.nr = 224, /* gettid */
.arg0 = 10, .arg1 = 11, .arg2 = 12,
.arg3 = 13, .arg4 = 14, .arg5 = 15,
};
do_syscall(&args);
if (args.nr != getpid() ||
args.arg0 != 10 || args.arg1 != 11 || args.arg2 != 12 ||
args.arg3 != 13 || args.arg4 != 14 || args.arg5 != 15) {
printf("[FAIL]\tgetpid() failed to preserve regs\n");
nerrs++;
} else {
printf("[OK]\tgetpid() preserves regs\n");
}
sethandler(SIGUSR1, empty_handler, 0);
args.nr = 37; /* kill */
args.arg0 = getpid();
args.arg1 = SIGUSR1;
do_syscall(&args);
if (args.nr != 0 ||
args.arg0 != getpid() || args.arg1 != SIGUSR1 || args.arg2 != 12 ||
args.arg3 != 13 || args.arg4 != 14 || args.arg5 != 15) {
printf("[FAIL]\tkill(getpid(), SIGUSR1) failed to preserve regs\n");
nerrs++;
} else {
printf("[OK]\tkill(getpid(), SIGUSR1) preserves regs\n");
}
clearhandler(SIGUSR1);
}
static void test_ptrace_syscall_restart(void)
{
printf("[RUN]\tptrace-induced syscall restart\n");
pid_t chld = fork();
if (chld < 0)
err(1, "fork");
if (chld == 0) {
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");
syscall(SYS_tgkill, pid, tid, SIGSTOP);
syscall(SYS_gettid, 10, 11, 12, 13, 14, 15);
_exit(0);
}
int status;
/* Wait for SIGSTOP. */
if (waitpid(chld, &status, 0) != chld || !WIFSTOPPED(status))
err(1, "waitpid");
struct user_regs_struct regs;
printf("[RUN]\tSYSEMU\n");
if (ptrace(PTRACE_SYSEMU, chld, 0, 0) != 0)
err(1, "PTRACE_SYSEMU");
wait_trap(chld);
if (ptrace(PTRACE_GETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_GETREGS");
if (regs.user_syscall_nr != SYS_gettid ||
regs.user_arg0 != 10 || regs.user_arg1 != 11 ||
regs.user_arg2 != 12 || regs.user_arg3 != 13 ||
regs.user_arg4 != 14 || regs.user_arg5 != 15) {
printf("[FAIL]\tInitial args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs.user_syscall_nr, (unsigned long)regs.user_arg0, (unsigned long)regs.user_arg1, (unsigned long)regs.user_arg2, (unsigned long)regs.user_arg3, (unsigned long)regs.user_arg4, (unsigned long)regs.user_arg5);
nerrs++;
} else {
printf("[OK]\tInitial nr and args are correct\n");
}
printf("[RUN]\tRestart the syscall (ip = 0x%lx)\n",
(unsigned long)regs.user_ip);
/*
* This does exactly what it appears to do if syscall is int80 or
* SYSCALL64. For SYSCALL32 or SYSENTER, though, this is highly
* magical. It needs to work so that ptrace and syscall restart
* work as expected.
*/
regs.user_ax = regs.user_syscall_nr;
regs.user_ip -= 2;
if (ptrace(PTRACE_SETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_SETREGS");
if (ptrace(PTRACE_SYSEMU, chld, 0, 0) != 0)
err(1, "PTRACE_SYSEMU");
wait_trap(chld);
if (ptrace(PTRACE_GETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_GETREGS");
if (regs.user_syscall_nr != SYS_gettid ||
regs.user_arg0 != 10 || regs.user_arg1 != 11 ||
regs.user_arg2 != 12 || regs.user_arg3 != 13 ||
regs.user_arg4 != 14 || regs.user_arg5 != 15) {
printf("[FAIL]\tRestart nr or args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs.user_syscall_nr, (unsigned long)regs.user_arg0, (unsigned long)regs.user_arg1, (unsigned long)regs.user_arg2, (unsigned long)regs.user_arg3, (unsigned long)regs.user_arg4, (unsigned long)regs.user_arg5);
nerrs++;
} else {
printf("[OK]\tRestarted nr and args are correct\n");
}
printf("[RUN]\tChange nr and args and restart the syscall (ip = 0x%lx)\n",
(unsigned long)regs.user_ip);
regs.user_ax = SYS_getpid;
regs.user_arg0 = 20;
regs.user_arg1 = 21;
regs.user_arg2 = 22;
regs.user_arg3 = 23;
regs.user_arg4 = 24;
regs.user_arg5 = 25;
regs.user_ip -= 2;
if (ptrace(PTRACE_SETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_SETREGS");
if (ptrace(PTRACE_SYSEMU, chld, 0, 0) != 0)
err(1, "PTRACE_SYSEMU");
wait_trap(chld);
if (ptrace(PTRACE_GETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_GETREGS");
if (regs.user_syscall_nr != SYS_getpid ||
regs.user_arg0 != 20 || regs.user_arg1 != 21 || regs.user_arg2 != 22 ||
regs.user_arg3 != 23 || regs.user_arg4 != 24 || regs.user_arg5 != 25) {
printf("[FAIL]\tRestart nr or args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs.user_syscall_nr, (unsigned long)regs.user_arg0, (unsigned long)regs.user_arg1, (unsigned long)regs.user_arg2, (unsigned long)regs.user_arg3, (unsigned long)regs.user_arg4, (unsigned long)regs.user_arg5);
nerrs++;
} else {
printf("[OK]\tReplacement nr and args are correct\n");
}
if (ptrace(PTRACE_CONT, chld, 0, 0) != 0)
err(1, "PTRACE_CONT");
if (waitpid(chld, &status, 0) != chld)
err(1, "waitpid");
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
printf("[FAIL]\tChild failed\n");
nerrs++;
} else {
printf("[OK]\tChild exited cleanly\n");
}
}
static void test_restart_under_ptrace(void)
{
printf("[RUN]\tkernel syscall restart under ptrace\n");
pid_t chld = fork();
if (chld < 0)
err(1, "fork");
if (chld == 0) {
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);
syscall(SYS_tgkill, pid, tid, SIGSTOP);
syscall(SYS_pause, 0, 0, 0, 0, 0, 0);
_exit(0);
}
int status;
/* Wait for SIGSTOP. */
if (waitpid(chld, &status, 0) != chld || !WIFSTOPPED(status))
err(1, "waitpid");
struct user_regs_struct regs;
printf("[RUN]\tSYSCALL\n");
if (ptrace(PTRACE_SYSCALL, chld, 0, 0) != 0)
err(1, "PTRACE_SYSCALL");
wait_trap(chld);
/* We should be stopped at pause(2) entry. */
if (ptrace(PTRACE_GETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_GETREGS");
if (regs.user_syscall_nr != SYS_pause ||
regs.user_arg0 != 0 || regs.user_arg1 != 0 ||
regs.user_arg2 != 0 || regs.user_arg3 != 0 ||
regs.user_arg4 != 0 || regs.user_arg5 != 0) {
printf("[FAIL]\tInitial args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs.user_syscall_nr, (unsigned long)regs.user_arg0, (unsigned long)regs.user_arg1, (unsigned long)regs.user_arg2, (unsigned long)regs.user_arg3, (unsigned long)regs.user_arg4, (unsigned long)regs.user_arg5);
nerrs++;
} else {
printf("[OK]\tInitial nr and args are correct\n");
}
/* Interrupt it. */
kill(chld, SIGUSR1);
/* Advance. We should be stopped at exit. */
printf("[RUN]\tSYSCALL\n");
if (ptrace(PTRACE_SYSCALL, chld, 0, 0) != 0)
err(1, "PTRACE_SYSCALL");
wait_trap(chld);
if (ptrace(PTRACE_GETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_GETREGS");
if (regs.user_syscall_nr != SYS_pause ||
regs.user_arg0 != 0 || regs.user_arg1 != 0 ||
regs.user_arg2 != 0 || regs.user_arg3 != 0 ||
regs.user_arg4 != 0 || regs.user_arg5 != 0) {
printf("[FAIL]\tArgs after SIGUSR1 are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs.user_syscall_nr, (unsigned long)regs.user_arg0, (unsigned long)regs.user_arg1, (unsigned long)regs.user_arg2, (unsigned long)regs.user_arg3, (unsigned long)regs.user_arg4, (unsigned long)regs.user_arg5);
nerrs++;
} else {
printf("[OK]\tArgs after SIGUSR1 are correct (ax = %ld)\n",
(long)regs.user_ax);
}
/* Poke the regs back in. This must not break anything. */
if (ptrace(PTRACE_SETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_SETREGS");
/* Catch the (ignored) SIGUSR1. */
if (ptrace(PTRACE_CONT, chld, 0, 0) != 0)
err(1, "PTRACE_CONT");
if (waitpid(chld, &status, 0) != chld)
err(1, "waitpid");
if (!WIFSTOPPED(status)) {
printf("[FAIL]\tChild was stopped for SIGUSR1 (status = 0x%x)\n", status);
nerrs++;
} else {
printf("[OK]\tChild got SIGUSR1\n");
}
/* The next event should be pause(2) again. */
printf("[RUN]\tStep again\n");
if (ptrace(PTRACE_SYSCALL, chld, 0, 0) != 0)
err(1, "PTRACE_SYSCALL");
wait_trap(chld);
/* We should be stopped at pause(2) entry. */
if (ptrace(PTRACE_GETREGS, chld, 0, &regs) != 0)
err(1, "PTRACE_GETREGS");
if (regs.user_syscall_nr != SYS_pause ||
regs.user_arg0 != 0 || regs.user_arg1 != 0 ||
regs.user_arg2 != 0 || regs.user_arg3 != 0 ||
regs.user_arg4 != 0 || regs.user_arg5 != 0) {
printf("[FAIL]\tpause did not restart (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs.user_syscall_nr, (unsigned long)regs.user_arg0, (unsigned long)regs.user_arg1, (unsigned long)regs.user_arg2, (unsigned long)regs.user_arg3, (unsigned long)regs.user_arg4, (unsigned long)regs.user_arg5);
nerrs++;
} else {
printf("[OK]\tpause(2) restarted correctly\n");
}
/* Kill it. */
kill(chld, SIGKILL);
if (waitpid(chld, &status, 0) != chld)
err(1, "waitpid");
}
int main()
{
printf("[RUN]\tCheck int80 return regs\n");
test_sys32_regs(do_full_int80);
#if defined(__i386__) && (!defined(__GLIBC__) || __GLIBC__ > 2 || __GLIBC_MINOR__ >= 16)
vsyscall32 = (void *)getauxval(AT_SYSINFO);
printf("[RUN]\tCheck AT_SYSINFO return regs\n");
test_sys32_regs(do_full_vsyscall32);
#endif
test_ptrace_syscall_restart();
test_restart_under_ptrace();
return 0;
}
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