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Subject[PATCH v3 2/6] selftests/clone3: add a check for invalid exit_signal
Check that the kernel fails calls with exit_signal with non-zero highest
32 bits, negative 32-bit exit_signal, and invalid exit_signal withing
CSIGNAL mask, like legacy clone syscalls do.

* tools/testing/selftests/clone3/clone3.c (enum test_mode): Add
CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG.
(call_clone3): Add args.exit_signal initialisation in case test_mode
is equal to one of the added enum test_mode values.
(main): Add test_clone3 clone check with test_mode equal to the added
enum test_mode values.

Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
---
tools/testing/selftests/clone3/clone3.c | 36 +++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)

diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c
index 7b65ee5..4837865 100644
--- a/tools/testing/selftests/clone3/clone3.c
+++ b/tools/testing/selftests/clone3/clone3.c
@@ -28,6 +28,10 @@ enum test_mode {
CLONE3_ARGS_NO_TEST,
CLONE3_ARGS_ALL_0,
CLONE3_ARGS_ALL_1,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
};

static pid_t raw_clone(struct clone_args *args, size_t size)
@@ -72,6 +76,22 @@ static int call_clone3(int flags, size_t size, enum test_mode test_mode)
args.tls = 1;
args.set_tid = 1;
break;
+
+ case CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG:
+ args.exit_signal = 0xbadc0ded00000000ULL;
+ break;
+
+ case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG:
+ args.exit_signal = 0x0000000080000000ULL;
+ break;
+
+ case CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG:
+ args.exit_signal = 0x0000000000000100ULL;
+ break;
+
+ case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG:
+ args.exit_signal = 0x00000000000000f0ULL;
+ break;
}

pid = raw_clone(&args, size);
@@ -146,6 +166,22 @@ int main(int argc, char *argv[])
/* Do a clone3() with all members set to 1 */
if (test_clone3(0, CLONE3_ARGS_SIZE_V0, -EINVAL, CLONE3_ARGS_ALL_1))
goto on_error;
+ /* Do a clone3() with exit_signal having highest 32 bits non-zero */
+ if (test_clone3(0, CLONE3_ARGS_SIZE_V0, -EINVAL,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG))
+ goto on_error;
+ /* Do a clone3() with negative 32-bit exit_signal */
+ if (test_clone3(0, CLONE3_ARGS_SIZE_V0, -EINVAL,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG))
+ goto on_error;
+ /* Do a clone3() with exit_signal not fitting into CSIGNAL mask */
+ if (test_clone3(0, CLONE3_ARGS_SIZE_V0, -EINVAL,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG))
+ goto on_error;
+ /* Do a clone3() with NSIG < exit_signal < CSIG */
+ if (test_clone3(0, CLONE3_ARGS_SIZE_V0, -EINVAL,
+ CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG))
+ goto on_error;
/*
* Do a clone3() with sizeof(struct clone_args) + 8
* and all members set to 0.
--
2.1.4
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