Unverified Commit c8994965 authored by Tahera Fahimi's avatar Tahera Fahimi Committed by Mickaël Salaün
Browse files

selftests/landlock: Test signal scoping for threads 



Expand the signal scoping tests with pthread_kill(3).  Test if a scoped
thread can send signal to a process in the same scoped domain, or a
non-sandboxed thread.

Signed-off-by: default avatarTahera Fahimi <fahimitahera@gmail.com>
Link: https://lore.kernel.org/r/c15e9eafbb2da1210e46ba8db7b8907f5ea11009.1725657728.git.fahimitahera@gmail.com


[mic: Improve commit message]
Signed-off-by: default avatarMickaël Salaün <mic@digikod.net>
parent ea292363

tools/testing/selftests/landlock/scoped_signal_test.c

+49 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#include <errno.h>

#include <fcntl.h>

#include <linux/landlock.h>

#include <pthread.h>

#include <signal.h>

#include <sys/prctl.h>

#include <sys/types.h>
@@ -248,4 +249,52 @@ TEST_F(scoped_domains, check_access_signal) 
		_metadata->exit_code = KSFT_FAIL;

}



static int thread_pipe[2];



enum thread_return {

	THREAD_INVALID = 0,

	THREAD_SUCCESS = 1,

	THREAD_ERROR = 2,

};



void *thread_func(void *arg)

{

	char buf;



	if (read(thread_pipe[0], &buf, 1) != 1)

		return (void *)THREAD_ERROR;



	return (void *)THREAD_SUCCESS;

}



TEST(signal_scoping_threads)

{

	pthread_t no_sandbox_thread, scoped_thread;

	enum thread_return ret = THREAD_INVALID;



	drop_caps(_metadata);

	ASSERT_EQ(0, pipe2(thread_pipe, O_CLOEXEC));



	ASSERT_EQ(0,

		  pthread_create(&no_sandbox_thread, NULL, thread_func, NULL));



	/* Restricts the domain after creating the first thread. */

	create_scoped_domain(_metadata, LANDLOCK_SCOPE_SIGNAL);



	ASSERT_EQ(EPERM, pthread_kill(no_sandbox_thread, 0));

	ASSERT_EQ(1, write(thread_pipe[1], ".", 1));



	ASSERT_EQ(0, pthread_create(&scoped_thread, NULL, thread_func, NULL));

	ASSERT_EQ(0, pthread_kill(scoped_thread, 0));

	ASSERT_EQ(1, write(thread_pipe[1], ".", 1));



	EXPECT_EQ(0, pthread_join(no_sandbox_thread, (void **)&ret));

	EXPECT_EQ(THREAD_SUCCESS, ret);

	EXPECT_EQ(0, pthread_join(scoped_thread, (void **)&ret));

	EXPECT_EQ(THREAD_SUCCESS, ret);



	EXPECT_EQ(0, close(thread_pipe[0]));

	EXPECT_EQ(0, close(thread_pipe[1]));

}



TEST_HARNESS_MAIN