On 06/09/2015 11:01 AM, Yuan Sun wrote:
> ID-outside-ns is interpreted according to which process is opening the file.
> If the process opening the file is in the same user namespace as the process
> PID, then ID-outside-ns is defined with respect to the parent user namespace.
> If the process opening the file is in a different user namespace, then
> ID-outside-ns is defined with respect to the user namespace of the process
> opening the file.
> If kernel version >= 3.19.0, the case will ignore the git check.
>
> Signed-off-by: Yuan Sun <sunyu...@huawei.com>
Hi,
> ---
> testcases/kernel/containers/userns/userns03.c | 250
> ++++++++++++++++++++++++++
please also add it to .gitignore and container runtest file.
> 1 file changed, 250 insertions(+)
> create mode 100644 testcases/kernel/containers/userns/userns03.c
>
> diff --git a/testcases/kernel/containers/userns/userns03.c
> b/testcases/kernel/containers/userns/userns03.c
> new file mode 100644
> index 0000000..01308f6
> --- /dev/null
> +++ b/testcases/kernel/containers/userns/userns03.c
> @@ -0,0 +1,250 @@
> +/*
> +* Copyright (c) Huawei Technologies Co., Ltd., 2015
> +* This program is free software; you can redistribute it and/or modify it
> +* under the terms of the GNU General Public License as published by the Free
> +* Software Foundation; either version 2 of the License, or (at your option)
> +* any later version. This program is distributed in the hope that it will be
> +* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
> +* Public License for more details. You should have received a copy of the GNU
> +* General Public License along with this program.
> +*/
> +
> +/*
> +* Verify that:
> +* /proc/PID/uid_map and /proc/PID/gid_map contains three values separated by
> +* white space:
> +* ID-inside-ns ID-outside-ns length
> +*
> +* ID-outside-ns is interpreted according to which process is opening the
> file.
> +* If the process opening the file is in the same user namespace as the
> process
> +* PID, then ID-outside-ns is defined with respect to the parent user
> namespace.
> +* If the process opening the file is in a different user namespace, then
> +* ID-outside-ns is defined with respect to the user namespace of the process
> +* opening the file.
> +*/
> +
> +#define _GNU_SOURCE
> +#include <sys/wait.h>
> +#include <assert.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdbool.h>
> +#include <unistd.h>
> +#include <string.h>
> +#include <errno.h>
> +#include "test.h"
> +#include "libclone.h"
> +#include "userns_helper.h"
> +
> +char *TCID = "user_namespace3";
> +int TST_TOTAL = 1;
> +static int cpid1, parentuid, parentgid;
> +static bool setgroups;
I'd suggest to use different name, since there already is setgroups(2) function.
> +
> +#define CHILD1UID 0
> +#define CHILD1GID 0
> +#define CHILD2UID 200
> +#define CHILD2GID 200
> +
> +/*
> + * child_fn1() - Inside a new user namespace
> + */
> +static int child_fn1(void)
> +{
> + TST_SAFE_CHECKPOINT_WAKE_AND_WAIT(NULL, 0);
> + return 0;
> +}
> +
> +
> +/*
> + * child_fn2() - Inside a new user namespace
> + */
> +static int child_fn2(void)
> +{
> + int exit_val;
> + int uid, gid;
> + char cpid1uidpath[BUFSIZ];
> + char cpid1gidpath[BUFSIZ];
> + int idinsidens, idoutsidens, length;
> +
> + uid = geteuid();
> + gid = getegid();
> +
> + if (uid == CHILD2UID) {
> + printf("Got expected uid.\n");
> + exit_val = 0;
> + } else {
> + printf("unexpected uid=%d\n", uid);
> + exit_val = 1;
> + }
> +
> + if (setgroups == 0) {
> + if (uid == CHILD2UID && gid == CHILD2GID) {
You are comparing uid twice, but that's just a minor.
> + printf("Got expected uid and gid.\n");
> + exit_val = 0;
> + } else {
> + printf("unexpected: uid=%d gid=%d\n", uid, gid);
> + exit_val = 1;
> + }
> + }
> + /*Get the uid parameters of the child_fn2 process.*/
> + SAFE_FILE_SCANF(NULL, "/proc/self/uid_map", "%d %d %d", &idinsidens,
> + &idoutsidens, &length);
> +
> + /* map file format:ID-inside-ns ID-outside-ns length
> + If the process opening the file is in the same user namespace as
> + the process PID, then ID-outside-ns is defined with respect to the
> + parent user namespace.*/
> + if (idinsidens != CHILD2UID || idoutsidens != parentuid) {
> + printf("child_fn2 checks /proc/cpid2/uid_map:\n");
> + printf("unexpected: idinsidens=%d idoutsidens=%d\n",
> + idinsidens, idoutsidens);
> + exit_val = 1;
> + }
> +
> + sprintf(cpid1uidpath, "/proc/%d/uid_map", cpid1);
> + SAFE_FILE_SCANF(NULL, cpid1uidpath, "%d %d %d", &idinsidens,
> + &idoutsidens, &length);
> +
> + /* If the process opening the file is in a different user namespace,
> + then ID-outside-ns is defined with respect to the user namespace
> + of the process opening the file.*/
> + if (idinsidens != CHILD1UID || idoutsidens != CHILD2UID) {
> + printf("child_fn2 checks /proc/cpid1/uid_map:\n");
> + printf("unexpected: idinsidens=%d idoutsidens=%d\n",
> + idinsidens, idoutsidens);
> + exit_val = 1;
> + }
> +
> + if (setgroups == 0) {
> + sprintf(cpid1gidpath, "/proc/%d/gid_map", cpid1);
> + SAFE_FILE_SCANF(NULL, "/proc/self/gid_map", "%d %d %d",
> + &idinsidens, &idoutsidens, &length);
> +
> + if (idinsidens != CHILD2GID || idoutsidens != parentgid) {
> + printf("child_fn2 checks /proc/cpid2/gid_map:\n");
> + printf("unexpected: idinsidens=%d idoutsidens=%d\n",
> + idinsidens, idoutsidens);
> + exit_val = 1;
> + }
> +
> + SAFE_FILE_SCANF(NULL, cpid1gidpath, "%d %d %d", &idinsidens,
> + &idoutsidens, &length);
> +
> + if (idinsidens != CHILD1GID || idoutsidens != CHILD2GID) {
> + printf("child_fn1 checks /proc/cpid1/gid_map:\n");
> + printf("unexpected: idinsidens=%d idoutsidens=%d\n",
> + idinsidens, idoutsidens);
> + exit_val = 1;
> + }
> + }
> + TST_SAFE_CHECKPOINT_WAKE_AND_WAIT(NULL, 1);
> + return exit_val;
> +}
> +
> +
> +static void setup(void)
> +{
> + char read_buf[BUFSIZ];
> +
> + check_newuser();
> + tst_tmpdir();
> + TST_CHECKPOINT_INIT(NULL);
> + if (tst_kvercmp(3, 19, 0) >= 0) {
I'm thinking if we shouldn't replace kernel version check with check that
"/proc/self/setgroups" exists. Then it would work on kernels that backport
those patches. What do you think?
> + SAFE_FILE_SCANF(NULL, "/proc/self/setgroups", "%s", read_buf);
> + if (strcmp(read_buf, "deny") == 0)
> + setgroups = 0;
> + else
> + setgroups = 1;
You could drop one of these branches, static variable already defaults to 0.
> + }
> +}
> +
> +static void cleanup(void)
> +{
> + tst_rmdir();
> +}
> +
> +/*type: 0->uid; 1->git */
typo here, git -> gid
I'd suggest a define for these, it would be easier to read something like
UID_MAP, GID_MAP instead of 0 and 1.
> +static int updatemap(int cpid, bool type, int idnum, int parentmappid)
> +{
> + char path[BUFSIZ];
> + char content[BUFSIZ];
> + int fd;
> +
> + if (type == 0)
> + sprintf(path, "/proc/%d/uid_map", cpid);
> + else if (type == 1)
> + sprintf(path, "/proc/%d/gid_map", cpid);
> + else
> + tst_brkm(TFAIL, NULL, "invalid type parameter");
> +
> + sprintf(content, "%d %d 1", idnum, parentmappid);
> + fd = SAFE_OPEN(NULL, path, O_WRONLY, 0644);
> + SAFE_WRITE(NULL, 1, fd, content, strlen(content));
You should pass cleanup to SAFE_ functions above.
You are leaking fd here. Try to run it as ./netns03 -i 10000 and you get
errno=EMFILE(24): Too many open files
> + return 0;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + pid_t cpid2;
> + int cpid1status, cpid2status;
> + int lc;
> +
> + tst_parse_opts(argc, argv, NULL, NULL);
> + setup();
> +
> + for (lc = 0; TEST_LOOPING(lc); lc++) {
> + tst_count = 0;
> +
> + parentuid = geteuid();
> + parentgid = getegid();
> +
> + cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
> + (void *)child_fn1, NULL);
> + if (cpid1 < 0)
> + tst_brkm(TFAIL | TERRNO, cleanup,
> + "cpid1 clone failed");
> +
> + cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
> + (void *)child_fn2, NULL);
> + if (cpid2 < 0)
> + tst_brkm(TFAIL | TERRNO, cleanup,
> + "cpid2 clone failed");
> +
> + updatemap(cpid1, 0, CHILD1UID, parentuid);
> + updatemap(cpid2, 0, CHILD2UID, parentuid);
> +
> + if (setgroups == 0) {
> + updatemap(cpid1, 1, CHILD1GID, parentuid);
> + updatemap(cpid2, 1, CHILD2GID, parentuid);
> + }
> +
> + TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
> + TST_SAFE_CHECKPOINT_WAIT(NULL, 1);
> + TST_SAFE_CHECKPOINT_WAKE(NULL, 0);
> + TST_SAFE_CHECKPOINT_WAKE(NULL, 1);
cleanup here as well
> +
> + if ((waitpid(cpid1, &cpid1status, 0) < 0) ||
> + (waitpid(cpid2, &cpid2status, 0) < 0))
> + tst_resm(TBROK, "parent: waitpid failed.");
tst_brkm(TBROK | TERRNO, cleanup, ...
> +
> + if (WIFSIGNALED(cpid1status)) {
> + tst_resm(TBROK, "child1 was killed with signal = %d",
tst_resm(TFAIL
> + WTERMSIG(cpid1status));
> + } else if (WIFEXITED(cpid1status) &&
> + WEXITSTATUS(cpid1status) != 0) {
> + tst_resm(TBROK, "child1 exited abnormally");
tst_resm(TFAIL
> + }
> +
> + if (WIFSIGNALED(cpid2status)) {
> + tst_resm(TBROK, "child2 was killed with signal = %d",
> + WTERMSIG(cpid2status));
tst_resm(TFAIL
> + } else if (WIFEXITED(cpid2status) &&
> + WEXITSTATUS(cpid2status) != 0) {
> + tst_resm(TBROK, "child2 exited abnormally");
tst_resm(TFAIL
Regards,
Jan
> + } else
> + tst_resm(TPASS, "Uid and the gid are right.");
> + }
> + tst_exit();
> +}
>
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