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Thu, 8 Sep 2022 14:03:29 +0000 Received: from VE1PR08MB4989.eurprd08.prod.outlook.com ([fe80::f536:84f7:c861:ccc1]) by VE1PR08MB4989.eurprd08.prod.outlook.com ([fe80::f536:84f7:c861:ccc1%4]) with mapi id 15.20.5612.016; Thu, 8 Sep 2022 14:03:29 +0000 From: Pavel Tikhomirov To: Eric Biederman , Alexander Viro , Christian Brauner , Andrei Vagin , linux-kernel@vger.kernel.org Cc: Pavel Tikhomirov , Kees Cook , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Andrew Morton , linux-ia64@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, kernel@openvz.org Subject: [PATCH v3 2/2] tests: Add CABA selftest Date: Thu, 8 Sep 2022 17:03:13 +0300 Message-Id: <20220908140313.313020-3-ptikhomirov@virtuozzo.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220908140313.313020-1-ptikhomirov@virtuozzo.com> References: <20220908140313.313020-1-ptikhomirov@virtuozzo.com> X-ClientProxiedBy: FR0P281CA0143.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:96::17) To VE1PR08MB4989.eurprd08.prod.outlook.com (2603:10a6:803:114::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR08MB4989:EE_|PAXPR08MB7671:EE_ X-MS-Office365-Filtering-Correlation-Id: 6a98ae78-a9a5-4158-dc2e-08da91a2e800 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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We check that Closest Alive Born Ancestor tree is right for this case. This case illustrates how CABA tree helps to understand order of creation between sessions. CC: Eric Biederman CC: Kees Cook CC: Alexander Viro CC: Ingo Molnar CC: Peter Zijlstra CC: Juri Lelli CC: Vincent Guittot CC: Dietmar Eggemann CC: Steven Rostedt CC: Ben Segall CC: Mel Gorman CC: Daniel Bristot de Oliveira CC: Valentin Schneider CC: Andrew Morton CC: linux-ia64@vger.kernel.org CC: linux-kernel@vger.kernel.org CC: linux-mm@kvack.org CC: linux-fsdevel@vger.kernel.org CC: kernel@openvz.org Signed-off-by: Pavel Tikhomirov --- v3: fix codding style --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/caba/.gitignore | 1 + tools/testing/selftests/caba/Makefile | 7 + tools/testing/selftests/caba/caba_test.c | 509 +++++++++++++++++++++++ tools/testing/selftests/caba/config | 1 + 5 files changed, 519 insertions(+) create mode 100644 tools/testing/selftests/caba/.gitignore create mode 100644 tools/testing/selftests/caba/Makefile create mode 100644 tools/testing/selftests/caba/caba_test.c create mode 100644 tools/testing/selftests/caba/config diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index c2064a35688b..d545bd9e3637 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -3,6 +3,7 @@ TARGETS += alsa TARGETS += arm64 TARGETS += bpf TARGETS += breakpoints +TARGETS += caba TARGETS += capabilities TARGETS += cgroup TARGETS += clone3 diff --git a/tools/testing/selftests/caba/.gitignore b/tools/testing/selftests/caba/.gitignore new file mode 100644 index 000000000000..aa2c55b774e2 --- /dev/null +++ b/tools/testing/selftests/caba/.gitignore @@ -0,0 +1 @@ +caba_test diff --git a/tools/testing/selftests/caba/Makefile b/tools/testing/selftests/caba/Makefile new file mode 100644 index 000000000000..4260145c3747 --- /dev/null +++ b/tools/testing/selftests/caba/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +# Makefile for caba selftests. +CFLAGS = -g -I../../../../usr/include/ -Wall -O2 + +TEST_GEN_FILES += caba_test + +include ../lib.mk diff --git a/tools/testing/selftests/caba/caba_test.c b/tools/testing/selftests/caba/caba_test.c new file mode 100644 index 000000000000..a89c4b96393b --- /dev/null +++ b/tools/testing/selftests/caba/caba_test.c @@ -0,0 +1,509 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../kselftest_harness.h" + +#ifndef CLONE_NEWPID +#define CLONE_NEWPID 0x20000000 /* New pid namespace */ +#endif + +/* Attempt to de-conflict with the selftests tree. */ +#ifndef SKIP +#define SKIP(s, ...) XFAIL(s, ##__VA_ARGS__) +#endif + +struct process { + pid_t pid; + pid_t real; + pid_t caba; + int sks[2]; + int dead; +}; + +struct process *processes; +int nr_processes = 8; +int current; + +static void cleanup(void) +{ + kill(processes[0].pid, SIGKILL); + /* It's enough to kill pidns init for others to die */ + kill(processes[1].pid, SIGKILL); +} + +enum commands { + TEST_FORK, + TEST_WAIT, + TEST_SUBREAPER, + TEST_SETSID, + TEST_DIE, + /* unused */ + TEST_GETSID, + TEST_SETNS, + TEST_SETPGID, + TEST_GETPGID, + TEST_GETPPID, +}; + +struct command { + enum commands cmd; + int arg1; + int arg2; +}; + +static void handle_command(void); + +static void mainloop(void) +{ + while (1) + handle_command(); +} + +#define CLONE_STACK_SIZE 4096 +#define __stack_aligned__ __attribute__((aligned(16))) +/* All arguments should be above stack, because it grows down */ +struct clone_args { + char stack[CLONE_STACK_SIZE] __stack_aligned__; + char stack_ptr[0]; + int id; +}; + +static int get_real_pid(void) +{ + char buf[11]; + int ret; + + ret = readlink("/proc/self", buf, sizeof(buf)-1); + if (ret <= 0) { + fprintf(stderr, "%d: readlink /proc/self :%m", current); + return -1; + } + buf[ret] = '\0'; + + processes[current].real = atoi(buf); + return 0; +} + +static int clone_func(void *_arg) +{ + struct clone_args *args = (struct clone_args *) _arg; + + current = args->id; + + if (get_real_pid()) + exit(1); + + printf("%3d: Hello. My pid is %d\n", args->id, getpid()); + mainloop(); + exit(0); +} + +static int make_child(int id, int flags) +{ + struct clone_args args; + pid_t cid; + + args.id = id; + + cid = clone(clone_func, args.stack_ptr, + flags | SIGCHLD, &args); + + if (cid < 0) + fprintf(stderr, "clone(%d, %d) :%m", id, flags); + + processes[id].pid = cid; + + return cid; +} + +static int open_proc(void) +{ + int fd; + char proc_mountpoint[] = "/tmp/.caba_test.proc.XXXXXX"; + + if (mkdtemp(proc_mountpoint) == NULL) { + fprintf(stderr, "mkdtemp failed %s :%m\n", proc_mountpoint); + return -1; + } + + if (mount("proc", proc_mountpoint, "proc", + MS_MGC_VAL | MS_NOSUID | MS_NOEXEC | MS_NODEV, NULL)) { + fprintf(stderr, "mount proc failed :%m\n"); + rmdir(proc_mountpoint); + return -1; + } + + fd = open(proc_mountpoint, O_RDONLY | O_DIRECTORY, 0); + if (fd < 0) + fprintf(stderr, "can't open proc :%m\n"); + + if (umount2(proc_mountpoint, MNT_DETACH)) { + fprintf(stderr, "can't umount proc :%m\n"); + goto err_close; + } + + if (rmdir(proc_mountpoint)) { + fprintf(stderr, "can't remove tmp dir :%m\n"); + goto err_close; + } + + return fd; +err_close: + if (fd >= 0) + close(fd); + return -1; +} + +static int open_pidns(int pid) +{ + int proc, fd; + char pidns_path[PATH_MAX]; + + proc = open_proc(); + if (proc < 0) { + fprintf(stderr, "open proc\n"); + return -1; + } + + sprintf(pidns_path, "%d/ns/pid", pid); + fd = openat(proc, pidns_path, O_RDONLY); + if (fd == -1) + fprintf(stderr, "open pidns fd\n"); + + close(proc); + return fd; +} + +static int setns_pid(int pid, int nstype) +{ + int pidns, ret; + + pidns = open_pidns(pid); + if (pidns < 0) + return -1; + + ret = setns(pidns, nstype); + if (ret == -1) + fprintf(stderr, "setns :%m\n"); + + close(pidns); + return ret; +} + +static void handle_command(void) +{ + int sk = processes[current].sks[0], ret, status = 0; + struct command cmd; + + ret = read(sk, &cmd, sizeof(cmd)); + if (ret != sizeof(cmd)) { + fprintf(stderr, "Unable to get command :%m\n"); + goto err; + } + + switch (cmd.cmd) { + case TEST_FORK: + { + pid_t pid; + + pid = make_child(cmd.arg1, cmd.arg2); + if (pid == -1) { + status = -1; + goto err; + } + + printf("%3d: fork(%d, %x) = %d\n", + current, cmd.arg1, cmd.arg2, pid); + processes[cmd.arg1].pid = pid; + } + break; + case TEST_WAIT: + printf("%3d: wait(%d) = %d\n", current, + cmd.arg1, processes[cmd.arg1].pid); + + if (waitpid(processes[cmd.arg1].pid, NULL, 0) == -1) { + fprintf(stderr, "waitpid(%d) :%m\n", processes[cmd.arg1].pid); + status = -1; + } + break; + case TEST_SUBREAPER: + printf("%3d: subreaper(%d)\n", current, cmd.arg1); + if (prctl(PR_SET_CHILD_SUBREAPER, cmd.arg1, 0, 0, 0) == -1) { + fprintf(stderr, "PR_SET_CHILD_SUBREAPER :%m\n"); + status = -1; + } + break; + case TEST_SETSID: + printf("%3d: setsid()\n", current); + if (setsid() == -1) { + fprintf(stderr, "setsid :%m\n"); + status = -1; + } + break; + case TEST_GETSID: + printf("%3d: getsid()\n", current); + status = getsid(getpid()); + if (status == -1) + fprintf(stderr, "getsid :%m\n"); + break; + case TEST_SETPGID: + printf("%3d: setpgid(%d, %d)\n", current, cmd.arg1, cmd.arg2); + if (setpgid(processes[cmd.arg1].pid, processes[cmd.arg2].pid) == -1) { + fprintf(stderr, "setpgid :%m\n"); + status = -1; + } + break; + case TEST_GETPGID: + printf("%3d: getpgid()\n", current); + status = getpgid(0); + if (status == -1) + fprintf(stderr, "getpgid :%m\n"); + break; + case TEST_GETPPID: + printf("%3d: getppid()\n", current); + status = getppid(); + if (status == -1) + fprintf(stderr, "getppid :%m\n"); + break; + case TEST_SETNS: + printf("%3d: setns(%d, %d) = %d\n", current, + cmd.arg1, cmd.arg2, processes[cmd.arg1].pid); + setns_pid(processes[cmd.arg1].pid, cmd.arg2); + + break; + case TEST_DIE: + printf("%3d: die()\n", current); + processes[current].dead = 1; + shutdown(sk, SHUT_RDWR); + exit(0); + } + + ret = write(sk, &status, sizeof(status)); + if (ret != sizeof(status)) { + fprintf(stderr, "Unable to answer :%m\n"); + goto err; + } + + if (status < 0) + goto err; + + return; +err: + shutdown(sk, SHUT_RDWR); + exit(1); +} + +static int send_command(int id, enum commands op, int arg1, int arg2) +{ + int sk = processes[id].sks[1], ret, status; + struct command cmd = {op, arg1, arg2}; + + if (op == TEST_FORK) { + if (processes[arg1].pid) { + fprintf(stderr, "%d is busy :%m\n", arg1); + return -1; + } + } + + ret = write(sk, &cmd, sizeof(cmd)); + if (ret != sizeof(cmd)) { + fprintf(stderr, "Unable to send command :%m\n"); + goto err; + } + + status = 0; + ret = read(sk, &status, sizeof(status)); + if (ret != sizeof(status) && !(status == 0 && op == TEST_DIE)) { + fprintf(stderr, "Unable to get answer :%m\n"); + goto err; + } + + if (status != -1 && (op == TEST_GETSID || op == TEST_GETPGID || op == TEST_GETPPID)) + return status; + + if (status) { + fprintf(stderr, "The command(%d, %d, %d) failed :%m\n", op, arg1, arg2); + goto err; + } + + return 0; +err: + cleanup(); + exit(1); +} + +static int get_caba(int pid, int *caba) +{ + char buf[64], *str; + FILE *fp; + size_t n; + + if (!pid) + snprintf(buf, sizeof(buf), "/proc/self/status"); + else + snprintf(buf, sizeof(buf), "/proc/%d/status", pid); + + fp = fopen(buf, "r"); + if (!fp) { + perror("fopen"); + return -1; + } + + str = NULL; + while (getline(&str, &n, fp) != -1) { + if (strncmp(str, "NScaba:", 7) == 0) { + if (str[7] == '\0') { + *caba = 0; + } else { + if (sscanf(str+7, "%d", caba) != 1) { + perror("sscanf"); + goto err; + } + } + + fclose(fp); + free(str); + return 0; + } + } +err: + free(str); + fclose(fp); + return -1; +} + +static bool caba_supported(void) +{ + int caba; + + return !get_caba(0, &caba); +} + +FIXTURE(caba) { +}; + +FIXTURE_SETUP(caba) +{ + bool ret; + + ret = caba_supported(); + ASSERT_GE(ret, 0); + if (!ret) + SKIP(return, "CABA is not supported"); +} + +FIXTURE_TEARDOWN(caba) +{ + bool ret; + + ret = caba_supported(); + ASSERT_GE(ret, 0); + if (!ret) + SKIP(return, "CABA is not supported"); + + cleanup(); +} + +TEST_F(caba, complex_sessions) +{ + int ret, i, pid, caba; + + ret = caba_supported(); + ASSERT_GE(ret, 0); + if (!ret) + SKIP(return, "CABA is not supported"); + + processes = mmap(NULL, PAGE_SIZE, + PROT_WRITE | PROT_READ, MAP_SHARED | MAP_ANONYMOUS, + 0, 0); + ASSERT_NE(processes, MAP_FAILED); + for (i = 0; i < nr_processes; i++) { + ret = socketpair(PF_UNIX, SOCK_STREAM, 0, processes[i].sks); + ASSERT_EQ(ret, 0); + } + + /* + * Create init: + * (pid, sid) + * (1, 1) + */ + pid = make_child(0, 0); ASSERT_GT(pid, 0); + ret = send_command(0, TEST_FORK, 1, CLONE_NEWPID); + ASSERT_EQ(ret, 0); + ret = send_command(1, TEST_SETSID, 0, 0); + ASSERT_EQ(ret, 0); + + /* + * Create sequence of processes from one session: + * (pid, sid) + * (1, 1)---(2, 2)---(3, 2)---(4, 2)---(5, 2) + */ + ret = send_command(1, TEST_FORK, 2, 0); ASSERT_EQ(ret, 0); + ret = send_command(2, TEST_SETSID, 0, 0); ASSERT_EQ(ret, 0); + ret = send_command(2, TEST_FORK, 3, 0); ASSERT_EQ(ret, 0); + ret = send_command(3, TEST_FORK, 4, 0); ASSERT_EQ(ret, 0); + ret = send_command(4, TEST_FORK, 5, 0); ASSERT_EQ(ret, 0); + /* + * Create another session in the middle of first one: + * (pid, sid) + * (1, 1)---(2, 2)---(3, 2)---(4, 4)-+-(5, 2) + * `-(6, 4)---(7, 4) + */ + ret = send_command(4, TEST_SETSID, 0, 0); ASSERT_EQ(ret, 0); + ret = send_command(4, TEST_FORK, 6, 0); ASSERT_EQ(ret, 0); + ret = send_command(6, TEST_FORK, 7, 0); ASSERT_EQ(ret, 0); + + /* + * Kill 6 while having 2 as child-sub-reaper: + * (pid, sid) + * (1, 1)---(2, 2)---(3, 2)---(4, 4)-+-(5, 2) + * `-(7, 4) + */ + ret = send_command(2, TEST_SUBREAPER, 1, 0); ASSERT_EQ(ret, 0); + ret = send_command(6, TEST_DIE, 0, 0); ASSERT_EQ(ret, 0); + ret = send_command(4, TEST_WAIT, 6, 0); ASSERT_EQ(ret, 0); + ret = send_command(2, TEST_SUBREAPER, 0, 0); ASSERT_EQ(ret, 0); + + /* + * Kill 3: + * (pid, sid) + * (1, 1)-+-(2, 2)---(7, 4) + * `-(4, 4)---(5, 2) + * note: This is a "tricky" session tree example where it's not obvious + * whether sid 2 was created first or sid 4 when creating the tree. + */ + ret = send_command(3, TEST_DIE, 0, 0); ASSERT_EQ(ret, 0); + ret = send_command(2, TEST_WAIT, 3, 0); ASSERT_EQ(ret, 0); + + /* + * CABA tree for this would be: + * (pid, sid) + * (1, 1)---(2, 2)---(4, 4)-+-(5, 2) + * `-(7, 4) + * note: CABA allows us to understand that session 2 was created first. + */ + ret = get_caba(processes[2].real, &caba); + ASSERT_EQ(ret, 0); ASSERT_EQ(caba, processes[1].real); + ret = get_caba(processes[4].real, &caba); + ASSERT_EQ(ret, 0); ASSERT_EQ(caba, processes[2].real); + ret = get_caba(processes[5].real, &caba); + ASSERT_EQ(ret, 0); ASSERT_EQ(caba, processes[4].real); + ret = get_caba(processes[7].real, &caba); + ASSERT_EQ(ret, 0); ASSERT_EQ(caba, processes[4].real); +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/caba/config b/tools/testing/selftests/caba/config new file mode 100644 index 000000000000..eae7bdaa3790 --- /dev/null +++ b/tools/testing/selftests/caba/config @@ -0,0 +1 @@ +CONFIG_PID_NS=y