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// Copyright 2021 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdint.h>
#include <sys/syscall.h>
#include <unistd.h>
#include "test/util/capability_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
int testSetPGIDOfZombie(void* arg) {
int p[2];
TEST_PCHECK(pipe(p) == 0);
pid_t pid = fork();
if (pid == 0) {
pid = fork();
// Create a second child to repeat one of syzkaller reproducers.
if (pid == 0) {
pid = getpid();
TEST_PCHECK(setpgid(pid, 0) == 0);
TEST_PCHECK(write(p[1], &pid, sizeof(pid)) == sizeof(pid));
_exit(0);
}
TEST_PCHECK(pid > 0);
_exit(0);
}
close(p[1]);
TEST_PCHECK(pid > 0);
// Get PID of the second child.
pid_t cpid;
TEST_PCHECK(read(p[0], &cpid, sizeof(cpid)) == sizeof(cpid));
// Wait when both child processes will die.
int c;
TEST_PCHECK(read(p[0], &c, sizeof(c)) == 0);
// Wait the second child process to collect its zombie.
int status;
TEST_PCHECK(RetryEINTR(waitpid)(cpid, &status, 0) == cpid);
// Set the child's group.
TEST_PCHECK(setpgid(pid, pid) == 0);
TEST_PCHECK(RetryEINTR(waitpid)(-pid, &status, 0) == pid);
TEST_PCHECK(status == 0);
_exit(0);
}
TEST(Processes, SetPGIDOfZombie) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_ADMIN)));
// Fork a test process in a new PID namespace, because it needs to manipulate
// with reparanted processes.
struct clone_arg {
// Reserve some space for clone() to locate arguments and retcode in this
// place.
char stack[128] __attribute__((aligned(16)));
char stack_ptr[0];
} ca;
pid_t pid;
ASSERT_THAT(pid = clone(testSetPGIDOfZombie, ca.stack_ptr,
CLONE_NEWPID | SIGCHLD, &ca),
SyscallSucceeds());
int status;
ASSERT_THAT(RetryEINTR(waitpid)(pid, &status, 0),
SyscallSucceedsWithValue(pid));
EXPECT_EQ(status, 0);
}
} // namespace testing
} // namespace gvisor
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