631df11d04
This change takes capsicum-test from upstream and applies some local changes to make the
tests work on FreeBSD when executed via Kyua.
The local modifications are as follows:
1. Make `OpenatTest.WithFlag` pass with the new dot-dot lookup behavior in FreeBSD 12.x+.
2. capsicum-test references a set of helper binaries: `mini-me`, `mini-me.noexec`, and
`mini-me.setuid`, as part of the execve/fexecve tests, via execve, fexecve, and open.
It achieves this upstream by assuming `mini-me*` is in the current directory, however,
in order for Kyua to execute `capsicum-test`, it needs to provide a full path to
`mini-me*`. In order to achieve this, I made `capsicum-test` cache the executable's
path from argv[0] in main(..) and use the cached value to compute the path to
`mini-me*` as part of the execve/fexecve testcases.
3. The capsicum-test test suite assumes that it's always being run on CAPABILITIES enabled
kernels. However, there's a chance that the test will be run on a host without a
CAPABILITIES enabled kernel, so we must check for the support before running the tests.
The way to achieve this is to add the relevant `feature_present("security_capabilities")`
check to SetupEnvironment::SetUp() and skip the tests when the support is not available.
While here, add a check for `kern.trap_enotcap` being enabled. As noted by markj@ in
https://github.com/google/capsicum-test/issues/23, this sysctl being enabled can trigger
non-deterministic failures. Therefore, the tests should be skipped if this sysctl is
enabled.
All local changes have been submitted to the capsicum-test project
(https://github.com/google/capsicum-test) and are in various stages of review.
Please see the following pull requests for more details:
1. https://github.com/google/capsicum-test/pull/35
2. https://github.com/google/capsicum-test/pull/41
3. https://github.com/google/capsicum-test/pull/42
Reviewed by: asomers
Discussed with: emaste, markj
Approved by: emaste (mentor)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D19758
1504 lines
49 KiB
C++
1504 lines
49 KiB
C++
// Tests of Linux-specific functionality
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#ifdef __linux__
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/timerfd.h>
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#include <sys/signalfd.h>
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#include <sys/eventfd.h>
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#include <sys/epoll.h>
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#include <sys/inotify.h>
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#include <sys/fanotify.h>
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#include <sys/mman.h>
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#include <sys/capability.h> // Requires e.g. libcap-dev package for POSIX.1e capabilities headers
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#include <linux/aio_abi.h>
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#include <linux/filter.h>
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#include <linux/seccomp.h>
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#include <linux/version.h>
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#include <poll.h>
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#include <sched.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string>
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#include "capsicum.h"
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#include "syscalls.h"
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#include "capsicum-test.h"
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TEST(Linux, TimerFD) {
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int fd = timerfd_create(CLOCK_MONOTONIC, 0);
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cap_rights_t r_ro;
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cap_rights_init(&r_ro, CAP_READ);
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cap_rights_t r_wo;
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cap_rights_init(&r_wo, CAP_WRITE);
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cap_rights_t r_rw;
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cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
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cap_rights_t r_rwpoll;
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cap_rights_init(&r_rwpoll, CAP_READ, CAP_WRITE, CAP_EVENT);
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int cap_fd_ro = dup(fd);
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EXPECT_OK(cap_fd_ro);
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EXPECT_OK(cap_rights_limit(cap_fd_ro, &r_ro));
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int cap_fd_wo = dup(fd);
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EXPECT_OK(cap_fd_wo);
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EXPECT_OK(cap_rights_limit(cap_fd_wo, &r_wo));
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int cap_fd_rw = dup(fd);
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EXPECT_OK(cap_fd_rw);
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EXPECT_OK(cap_rights_limit(cap_fd_rw, &r_rw));
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int cap_fd_all = dup(fd);
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EXPECT_OK(cap_fd_all);
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EXPECT_OK(cap_rights_limit(cap_fd_all, &r_rwpoll));
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struct itimerspec old_ispec;
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struct itimerspec ispec;
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ispec.it_interval.tv_sec = 0;
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ispec.it_interval.tv_nsec = 0;
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ispec.it_value.tv_sec = 0;
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ispec.it_value.tv_nsec = 100000000; // 100ms
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EXPECT_NOTCAPABLE(timerfd_settime(cap_fd_ro, 0, &ispec, NULL));
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EXPECT_NOTCAPABLE(timerfd_settime(cap_fd_wo, 0, &ispec, &old_ispec));
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EXPECT_OK(timerfd_settime(cap_fd_wo, 0, &ispec, NULL));
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EXPECT_OK(timerfd_settime(cap_fd_rw, 0, &ispec, NULL));
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EXPECT_OK(timerfd_settime(cap_fd_all, 0, &ispec, NULL));
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EXPECT_NOTCAPABLE(timerfd_gettime(cap_fd_wo, &old_ispec));
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EXPECT_OK(timerfd_gettime(cap_fd_ro, &old_ispec));
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EXPECT_OK(timerfd_gettime(cap_fd_rw, &old_ispec));
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EXPECT_OK(timerfd_gettime(cap_fd_all, &old_ispec));
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// To be able to poll() for the timer pop, still need CAP_EVENT.
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struct pollfd poll_fd;
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for (int ii = 0; ii < 3; ii++) {
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poll_fd.revents = 0;
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poll_fd.events = POLLIN;
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switch (ii) {
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case 0: poll_fd.fd = cap_fd_ro; break;
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case 1: poll_fd.fd = cap_fd_wo; break;
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case 2: poll_fd.fd = cap_fd_rw; break;
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}
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// Poll immediately returns with POLLNVAL
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EXPECT_OK(poll(&poll_fd, 1, 400));
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EXPECT_EQ(0, (poll_fd.revents & POLLIN));
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EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
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}
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poll_fd.fd = cap_fd_all;
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EXPECT_OK(poll(&poll_fd, 1, 400));
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EXPECT_NE(0, (poll_fd.revents & POLLIN));
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EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
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EXPECT_OK(timerfd_gettime(cap_fd_all, &old_ispec));
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EXPECT_EQ(0, old_ispec.it_value.tv_sec);
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EXPECT_EQ(0, old_ispec.it_value.tv_nsec);
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EXPECT_EQ(0, old_ispec.it_interval.tv_sec);
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EXPECT_EQ(0, old_ispec.it_interval.tv_nsec);
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close(cap_fd_all);
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close(cap_fd_rw);
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close(cap_fd_wo);
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close(cap_fd_ro);
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close(fd);
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}
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FORK_TEST(Linux, SignalFD) {
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if (force_mt) {
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TEST_SKIPPED("multi-threaded run clashes with signals");
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return;
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}
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pid_t me = getpid();
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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// Block signals before registering against a new signal FD.
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EXPECT_OK(sigprocmask(SIG_BLOCK, &mask, NULL));
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int fd = signalfd(-1, &mask, 0);
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EXPECT_OK(fd);
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cap_rights_t r_rs;
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cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
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cap_rights_t r_ws;
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cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
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cap_rights_t r_sig;
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cap_rights_init(&r_sig, CAP_FSIGNAL);
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cap_rights_t r_rssig;
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cap_rights_init(&r_rssig, CAP_FSIGNAL, CAP_READ, CAP_SEEK);
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cap_rights_t r_rssig_poll;
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cap_rights_init(&r_rssig_poll, CAP_FSIGNAL, CAP_READ, CAP_SEEK, CAP_EVENT);
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// Various capability variants.
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int cap_fd_none = dup(fd);
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EXPECT_OK(cap_fd_none);
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EXPECT_OK(cap_rights_limit(cap_fd_none, &r_ws));
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int cap_fd_read = dup(fd);
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EXPECT_OK(cap_fd_read);
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EXPECT_OK(cap_rights_limit(cap_fd_read, &r_rs));
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int cap_fd_sig = dup(fd);
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EXPECT_OK(cap_fd_sig);
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EXPECT_OK(cap_rights_limit(cap_fd_sig, &r_sig));
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int cap_fd_sig_read = dup(fd);
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EXPECT_OK(cap_fd_sig_read);
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EXPECT_OK(cap_rights_limit(cap_fd_sig_read, &r_rssig));
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int cap_fd_all = dup(fd);
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EXPECT_OK(cap_fd_all);
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EXPECT_OK(cap_rights_limit(cap_fd_all, &r_rssig_poll));
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struct signalfd_siginfo fdsi;
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// Need CAP_READ to read the signal information
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kill(me, SIGUSR1);
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EXPECT_NOTCAPABLE(read(cap_fd_none, &fdsi, sizeof(struct signalfd_siginfo)));
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EXPECT_NOTCAPABLE(read(cap_fd_sig, &fdsi, sizeof(struct signalfd_siginfo)));
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int len = read(cap_fd_read, &fdsi, sizeof(struct signalfd_siginfo));
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EXPECT_OK(len);
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EXPECT_EQ(sizeof(struct signalfd_siginfo), (size_t)len);
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EXPECT_EQ(SIGUSR1, (int)fdsi.ssi_signo);
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// Need CAP_FSIGNAL to modify the signal mask.
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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sigaddset(&mask, SIGUSR2);
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EXPECT_OK(sigprocmask(SIG_BLOCK, &mask, NULL));
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EXPECT_NOTCAPABLE(signalfd(cap_fd_none, &mask, 0));
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EXPECT_NOTCAPABLE(signalfd(cap_fd_read, &mask, 0));
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EXPECT_EQ(cap_fd_sig, signalfd(cap_fd_sig, &mask, 0));
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// Need CAP_EVENT to get notification of a signal in poll(2).
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kill(me, SIGUSR2);
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struct pollfd poll_fd;
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poll_fd.revents = 0;
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poll_fd.events = POLLIN;
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poll_fd.fd = cap_fd_sig_read;
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EXPECT_OK(poll(&poll_fd, 1, 400));
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EXPECT_EQ(0, (poll_fd.revents & POLLIN));
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EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
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poll_fd.fd = cap_fd_all;
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EXPECT_OK(poll(&poll_fd, 1, 400));
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EXPECT_NE(0, (poll_fd.revents & POLLIN));
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EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
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}
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TEST(Linux, EventFD) {
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int fd = eventfd(0, 0);
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EXPECT_OK(fd);
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cap_rights_t r_rs;
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cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
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cap_rights_t r_ws;
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cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
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cap_rights_t r_rws;
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cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
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cap_rights_t r_rwspoll;
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cap_rights_init(&r_rwspoll, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_EVENT);
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int cap_ro = dup(fd);
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EXPECT_OK(cap_ro);
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EXPECT_OK(cap_rights_limit(cap_ro, &r_rs));
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int cap_wo = dup(fd);
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EXPECT_OK(cap_wo);
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EXPECT_OK(cap_rights_limit(cap_wo, &r_ws));
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int cap_rw = dup(fd);
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EXPECT_OK(cap_rw);
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EXPECT_OK(cap_rights_limit(cap_rw, &r_rws));
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int cap_all = dup(fd);
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EXPECT_OK(cap_all);
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EXPECT_OK(cap_rights_limit(cap_all, &r_rwspoll));
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pid_t child = fork();
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if (child == 0) {
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// Child: write counter to eventfd
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uint64_t u = 42;
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EXPECT_NOTCAPABLE(write(cap_ro, &u, sizeof(u)));
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EXPECT_OK(write(cap_wo, &u, sizeof(u)));
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exit(HasFailure());
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}
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sleep(1); // Allow child to write
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struct pollfd poll_fd;
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poll_fd.revents = 0;
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poll_fd.events = POLLIN;
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poll_fd.fd = cap_rw;
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EXPECT_OK(poll(&poll_fd, 1, 400));
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EXPECT_EQ(0, (poll_fd.revents & POLLIN));
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EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
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poll_fd.fd = cap_all;
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EXPECT_OK(poll(&poll_fd, 1, 400));
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EXPECT_NE(0, (poll_fd.revents & POLLIN));
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EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
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uint64_t u;
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EXPECT_NOTCAPABLE(read(cap_wo, &u, sizeof(u)));
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EXPECT_OK(read(cap_ro, &u, sizeof(u)));
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EXPECT_EQ(42, (int)u);
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// Wait for the child.
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int status;
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EXPECT_EQ(child, waitpid(child, &status, 0));
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int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
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EXPECT_EQ(0, rc);
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close(cap_all);
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close(cap_rw);
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close(cap_wo);
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close(cap_ro);
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close(fd);
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}
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FORK_TEST(Linux, epoll) {
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int sock_fds[2];
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EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));
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// Queue some data.
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char buffer[4] = {1, 2, 3, 4};
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EXPECT_OK(write(sock_fds[1], buffer, sizeof(buffer)));
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EXPECT_OK(cap_enter()); // Enter capability mode.
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int epoll_fd = epoll_create(1);
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EXPECT_OK(epoll_fd);
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cap_rights_t r_rs;
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cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
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cap_rights_t r_ws;
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cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
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cap_rights_t r_rws;
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cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
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cap_rights_t r_rwspoll;
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cap_rights_init(&r_rwspoll, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_EVENT);
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cap_rights_t r_epoll;
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cap_rights_init(&r_epoll, CAP_EPOLL_CTL);
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int cap_epoll_wo = dup(epoll_fd);
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EXPECT_OK(cap_epoll_wo);
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EXPECT_OK(cap_rights_limit(cap_epoll_wo, &r_ws));
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int cap_epoll_ro = dup(epoll_fd);
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EXPECT_OK(cap_epoll_ro);
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EXPECT_OK(cap_rights_limit(cap_epoll_ro, &r_rs));
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int cap_epoll_rw = dup(epoll_fd);
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EXPECT_OK(cap_epoll_rw);
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EXPECT_OK(cap_rights_limit(cap_epoll_rw, &r_rws));
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int cap_epoll_poll = dup(epoll_fd);
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EXPECT_OK(cap_epoll_poll);
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EXPECT_OK(cap_rights_limit(cap_epoll_poll, &r_rwspoll));
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int cap_epoll_ctl = dup(epoll_fd);
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EXPECT_OK(cap_epoll_ctl);
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EXPECT_OK(cap_rights_limit(cap_epoll_ctl, &r_epoll));
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// Can only modify the FDs being monitored if the CAP_EPOLL_CTL right is present.
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struct epoll_event eev;
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memset(&eev, 0, sizeof(eev));
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eev.events = EPOLLIN|EPOLLOUT|EPOLLPRI;
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_ro, EPOLL_CTL_ADD, sock_fds[0], &eev));
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_wo, EPOLL_CTL_ADD, sock_fds[0], &eev));
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_rw, EPOLL_CTL_ADD, sock_fds[0], &eev));
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EXPECT_OK(epoll_ctl(cap_epoll_ctl, EPOLL_CTL_ADD, sock_fds[0], &eev));
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eev.events = EPOLLIN|EPOLLOUT;
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_ro, EPOLL_CTL_MOD, sock_fds[0], &eev));
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_wo, EPOLL_CTL_MOD, sock_fds[0], &eev));
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_rw, EPOLL_CTL_MOD, sock_fds[0], &eev));
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EXPECT_OK(epoll_ctl(cap_epoll_ctl, EPOLL_CTL_MOD, sock_fds[0], &eev));
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// Running epoll_pwait(2) requires CAP_EVENT.
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eev.events = 0;
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EXPECT_NOTCAPABLE(epoll_pwait(cap_epoll_ro, &eev, 1, 100, NULL));
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EXPECT_NOTCAPABLE(epoll_pwait(cap_epoll_wo, &eev, 1, 100, NULL));
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EXPECT_NOTCAPABLE(epoll_pwait(cap_epoll_rw, &eev, 1, 100, NULL));
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EXPECT_OK(epoll_pwait(cap_epoll_poll, &eev, 1, 100, NULL));
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EXPECT_EQ(EPOLLIN, eev.events & EPOLLIN);
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_ro, EPOLL_CTL_DEL, sock_fds[0], &eev));
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_wo, EPOLL_CTL_DEL, sock_fds[0], &eev));
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EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_rw, EPOLL_CTL_DEL, sock_fds[0], &eev));
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EXPECT_OK(epoll_ctl(epoll_fd, EPOLL_CTL_DEL, sock_fds[0], &eev));
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close(cap_epoll_ctl);
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close(cap_epoll_poll);
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close(cap_epoll_rw);
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close(cap_epoll_ro);
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close(cap_epoll_wo);
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close(epoll_fd);
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close(sock_fds[1]);
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close(sock_fds[0]);
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}
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TEST(Linux, fstatat) {
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int fd = open(TmpFile("cap_fstatat"), O_CREAT|O_RDWR, 0644);
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EXPECT_OK(fd);
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unsigned char buffer[] = {1, 2, 3, 4};
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EXPECT_OK(write(fd, buffer, sizeof(buffer)));
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cap_rights_t rights;
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int cap_rf = dup(fd);
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EXPECT_OK(cap_rf);
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EXPECT_OK(cap_rights_limit(cap_rf, cap_rights_init(&rights, CAP_READ, CAP_FSTAT)));
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int cap_ro = dup(fd);
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EXPECT_OK(cap_ro);
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EXPECT_OK(cap_rights_limit(cap_ro, cap_rights_init(&rights, CAP_READ)));
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struct stat info;
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EXPECT_OK(fstatat(fd, "", &info, AT_EMPTY_PATH));
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EXPECT_NOTCAPABLE(fstatat(cap_ro, "", &info, AT_EMPTY_PATH));
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EXPECT_OK(fstatat(cap_rf, "", &info, AT_EMPTY_PATH));
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close(cap_ro);
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close(cap_rf);
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close(fd);
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int dir = open(tmpdir.c_str(), O_RDONLY);
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EXPECT_OK(dir);
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int dir_rf = dup(dir);
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EXPECT_OK(dir_rf);
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EXPECT_OK(cap_rights_limit(dir_rf, cap_rights_init(&rights, CAP_READ, CAP_FSTAT)));
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int dir_ro = dup(fd);
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EXPECT_OK(dir_ro);
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EXPECT_OK(cap_rights_limit(dir_ro, cap_rights_init(&rights, CAP_READ)));
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EXPECT_OK(fstatat(dir, "cap_fstatat", &info, AT_EMPTY_PATH));
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EXPECT_NOTCAPABLE(fstatat(dir_ro, "cap_fstatat", &info, AT_EMPTY_PATH));
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EXPECT_OK(fstatat(dir_rf, "cap_fstatat", &info, AT_EMPTY_PATH));
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|
|
close(dir_ro);
|
|
close(dir_rf);
|
|
close(dir);
|
|
|
|
unlink(TmpFile("cap_fstatat"));
|
|
}
|
|
|
|
// fanotify support may not be available at compile-time
|
|
#ifdef __NR_fanotify_init
|
|
TEST(Linux, fanotify) {
|
|
REQUIRE_ROOT();
|
|
int fa_fd = fanotify_init(FAN_CLASS_NOTIF, O_RDWR);
|
|
EXPECT_OK(fa_fd);
|
|
if (fa_fd < 0) return; // May not be enabled
|
|
|
|
cap_rights_t r_rs;
|
|
cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
|
|
cap_rights_t r_ws;
|
|
cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
|
|
cap_rights_t r_rws;
|
|
cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
|
|
cap_rights_t r_rwspoll;
|
|
cap_rights_init(&r_rwspoll, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_EVENT);
|
|
cap_rights_t r_rwsnotify;
|
|
cap_rights_init(&r_rwsnotify, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_NOTIFY);
|
|
cap_rights_t r_rsl;
|
|
cap_rights_init(&r_rsl, CAP_READ, CAP_SEEK, CAP_LOOKUP);
|
|
cap_rights_t r_rslstat;
|
|
cap_rights_init(&r_rslstat, CAP_READ, CAP_SEEK, CAP_LOOKUP, CAP_FSTAT);
|
|
cap_rights_t r_rsstat;
|
|
cap_rights_init(&r_rsstat, CAP_READ, CAP_SEEK, CAP_FSTAT);
|
|
|
|
int cap_fd_ro = dup(fa_fd);
|
|
EXPECT_OK(cap_fd_ro);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_ro, &r_rs));
|
|
int cap_fd_wo = dup(fa_fd);
|
|
EXPECT_OK(cap_fd_wo);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_wo, &r_ws));
|
|
int cap_fd_rw = dup(fa_fd);
|
|
EXPECT_OK(cap_fd_rw);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_rw, &r_rws));
|
|
int cap_fd_poll = dup(fa_fd);
|
|
EXPECT_OK(cap_fd_poll);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_poll, &r_rwspoll));
|
|
int cap_fd_not = dup(fa_fd);
|
|
EXPECT_OK(cap_fd_not);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_not, &r_rwsnotify));
|
|
|
|
int rc = mkdir(TmpFile("cap_notify"), 0755);
|
|
EXPECT_TRUE(rc == 0 || errno == EEXIST);
|
|
int dfd = open(TmpFile("cap_notify"), O_RDONLY);
|
|
EXPECT_OK(dfd);
|
|
int fd = open(TmpFile("cap_notify/file"), O_CREAT|O_RDWR, 0644);
|
|
close(fd);
|
|
int cap_dfd = dup(dfd);
|
|
EXPECT_OK(cap_dfd);
|
|
EXPECT_OK(cap_rights_limit(cap_dfd, &r_rslstat));
|
|
EXPECT_OK(cap_dfd);
|
|
int cap_dfd_rs = dup(dfd);
|
|
EXPECT_OK(cap_dfd_rs);
|
|
EXPECT_OK(cap_rights_limit(cap_dfd_rs, &r_rs));
|
|
EXPECT_OK(cap_dfd_rs);
|
|
int cap_dfd_rsstat = dup(dfd);
|
|
EXPECT_OK(cap_dfd_rsstat);
|
|
EXPECT_OK(cap_rights_limit(cap_dfd_rsstat, &r_rsstat));
|
|
EXPECT_OK(cap_dfd_rsstat);
|
|
int cap_dfd_rsl = dup(dfd);
|
|
EXPECT_OK(cap_dfd_rsl);
|
|
EXPECT_OK(cap_rights_limit(cap_dfd_rsl, &r_rsl));
|
|
EXPECT_OK(cap_dfd_rsl);
|
|
|
|
// Need CAP_NOTIFY to change what's monitored.
|
|
EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_ro, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
|
|
EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_wo, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
|
|
EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_rw, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
|
|
EXPECT_OK(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
|
|
|
|
// Need CAP_FSTAT on the thing monitored.
|
|
EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd_rs, NULL));
|
|
EXPECT_OK(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd_rsstat, NULL));
|
|
|
|
// Too add monitoring of a file under a dfd, need CAP_LOOKUP|CAP_FSTAT on the dfd.
|
|
EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY, cap_dfd_rsstat, "file"));
|
|
EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY, cap_dfd_rsl, "file"));
|
|
EXPECT_OK(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY, cap_dfd, "file"));
|
|
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
// Child: Perform activity in the directory under notify.
|
|
sleep(1);
|
|
unlink(TmpFile("cap_notify/temp"));
|
|
int fd = open(TmpFile("cap_notify/temp"), O_CREAT|O_RDWR, 0644);
|
|
close(fd);
|
|
exit(0);
|
|
}
|
|
|
|
// Need CAP_EVENT to poll.
|
|
struct pollfd poll_fd;
|
|
poll_fd.revents = 0;
|
|
poll_fd.events = POLLIN;
|
|
poll_fd.fd = cap_fd_rw;
|
|
EXPECT_OK(poll(&poll_fd, 1, 1400));
|
|
EXPECT_EQ(0, (poll_fd.revents & POLLIN));
|
|
EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
|
|
|
|
poll_fd.fd = cap_fd_not;
|
|
EXPECT_OK(poll(&poll_fd, 1, 1400));
|
|
EXPECT_EQ(0, (poll_fd.revents & POLLIN));
|
|
EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
|
|
|
|
poll_fd.fd = cap_fd_poll;
|
|
EXPECT_OK(poll(&poll_fd, 1, 1400));
|
|
EXPECT_NE(0, (poll_fd.revents & POLLIN));
|
|
EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
|
|
|
|
// Need CAP_READ to read.
|
|
struct fanotify_event_metadata ev;
|
|
memset(&ev, 0, sizeof(ev));
|
|
EXPECT_NOTCAPABLE(read(cap_fd_wo, &ev, sizeof(ev)));
|
|
rc = read(fa_fd, &ev, sizeof(ev));
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ((int)sizeof(struct fanotify_event_metadata), rc);
|
|
EXPECT_EQ(child, ev.pid);
|
|
EXPECT_NE(0, ev.fd);
|
|
|
|
// TODO(drysdale): reinstate if/when capsicum-linux propagates rights
|
|
// to fanotify-generated FDs.
|
|
#ifdef OMIT
|
|
// fanotify(7) gives us a FD for the changed file. This should
|
|
// only have rights that are a subset of those for the original
|
|
// monitored directory file descriptor.
|
|
cap_rights_t rights;
|
|
CAP_SET_ALL(&rights);
|
|
EXPECT_OK(cap_rights_get(ev.fd, &rights));
|
|
EXPECT_RIGHTS_IN(&rights, &r_rslstat);
|
|
#endif
|
|
|
|
// Wait for the child.
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
|
|
close(cap_dfd_rsstat);
|
|
close(cap_dfd_rsl);
|
|
close(cap_dfd_rs);
|
|
close(cap_dfd);
|
|
close(dfd);
|
|
unlink(TmpFile("cap_notify/file"));
|
|
unlink(TmpFile("cap_notify/temp"));
|
|
rmdir(TmpFile("cap_notify"));
|
|
close(cap_fd_not);
|
|
close(cap_fd_poll);
|
|
close(cap_fd_rw);
|
|
close(cap_fd_wo);
|
|
close(cap_fd_ro);
|
|
close(fa_fd);
|
|
}
|
|
#endif
|
|
|
|
TEST(Linux, inotify) {
|
|
int i_fd = inotify_init();
|
|
EXPECT_OK(i_fd);
|
|
|
|
cap_rights_t r_rs;
|
|
cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
|
|
cap_rights_t r_ws;
|
|
cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
|
|
cap_rights_t r_rws;
|
|
cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
|
|
cap_rights_t r_rwsnotify;
|
|
cap_rights_init(&r_rwsnotify, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_NOTIFY);
|
|
|
|
int cap_fd_ro = dup(i_fd);
|
|
EXPECT_OK(cap_fd_ro);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_ro, &r_rs));
|
|
int cap_fd_wo = dup(i_fd);
|
|
EXPECT_OK(cap_fd_wo);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_wo, &r_ws));
|
|
int cap_fd_rw = dup(i_fd);
|
|
EXPECT_OK(cap_fd_rw);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_rw, &r_rws));
|
|
int cap_fd_all = dup(i_fd);
|
|
EXPECT_OK(cap_fd_all);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_all, &r_rwsnotify));
|
|
|
|
int fd = open(TmpFile("cap_inotify"), O_CREAT|O_RDWR, 0644);
|
|
EXPECT_NOTCAPABLE(inotify_add_watch(cap_fd_rw, TmpFile("cap_inotify"), IN_ACCESS|IN_MODIFY));
|
|
int wd = inotify_add_watch(i_fd, TmpFile("cap_inotify"), IN_ACCESS|IN_MODIFY);
|
|
EXPECT_OK(wd);
|
|
|
|
unsigned char buffer[] = {1, 2, 3, 4};
|
|
EXPECT_OK(write(fd, buffer, sizeof(buffer)));
|
|
|
|
struct inotify_event iev;
|
|
memset(&iev, 0, sizeof(iev));
|
|
EXPECT_NOTCAPABLE(read(cap_fd_wo, &iev, sizeof(iev)));
|
|
int rc = read(cap_fd_ro, &iev, sizeof(iev));
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ((int)sizeof(iev), rc);
|
|
EXPECT_EQ(wd, iev.wd);
|
|
|
|
EXPECT_NOTCAPABLE(inotify_rm_watch(cap_fd_wo, wd));
|
|
EXPECT_OK(inotify_rm_watch(cap_fd_all, wd));
|
|
|
|
close(fd);
|
|
close(cap_fd_all);
|
|
close(cap_fd_rw);
|
|
close(cap_fd_wo);
|
|
close(cap_fd_ro);
|
|
close(i_fd);
|
|
unlink(TmpFile("cap_inotify"));
|
|
}
|
|
|
|
TEST(Linux, ArchChange) {
|
|
const char* prog_candidates[] = {"./mini-me.32", "./mini-me.x32", "./mini-me.64"};
|
|
const char* progs[] = {NULL, NULL, NULL};
|
|
char* argv_pass[] = {(char*)"to-come", (char*)"--capmode", NULL};
|
|
char* null_envp[] = {NULL};
|
|
int fds[3];
|
|
int count = 0;
|
|
|
|
for (int ii = 0; ii < 3; ii++) {
|
|
fds[count] = open(prog_candidates[ii], O_RDONLY);
|
|
if (fds[count] >= 0) {
|
|
progs[count] = prog_candidates[ii];
|
|
count++;
|
|
}
|
|
}
|
|
if (count == 0) {
|
|
TEST_SKIPPED("no different-architecture programs available");
|
|
return;
|
|
}
|
|
|
|
for (int ii = 0; ii < count; ii++) {
|
|
// Fork-and-exec a binary of this architecture.
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
EXPECT_OK(cap_enter()); // Enter capability mode
|
|
if (verbose) fprintf(stderr, "[%d] call fexecve(%s, %s)\n",
|
|
getpid_(), progs[ii], argv_pass[1]);
|
|
argv_pass[0] = (char *)progs[ii];
|
|
int rc = fexecve_(fds[ii], argv_pass, null_envp);
|
|
fprintf(stderr, "fexecve(%s) returned %d errno %d\n", progs[ii], rc, errno);
|
|
exit(99); // Should not reach here.
|
|
}
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
close(fds[ii]);
|
|
}
|
|
}
|
|
|
|
FORK_TEST(Linux, Namespace) {
|
|
REQUIRE_ROOT();
|
|
pid_t me = getpid_();
|
|
|
|
// Create a new UTS namespace.
|
|
EXPECT_OK(unshare(CLONE_NEWUTS));
|
|
// Open an FD to its symlink.
|
|
char buffer[256];
|
|
sprintf(buffer, "/proc/%d/ns/uts", me);
|
|
int ns_fd = open(buffer, O_RDONLY);
|
|
|
|
cap_rights_t r_rwlstat;
|
|
cap_rights_init(&r_rwlstat, CAP_READ, CAP_WRITE, CAP_LOOKUP, CAP_FSTAT);
|
|
cap_rights_t r_rwlstatns;
|
|
cap_rights_init(&r_rwlstatns, CAP_READ, CAP_WRITE, CAP_LOOKUP, CAP_FSTAT, CAP_SETNS);
|
|
|
|
int cap_fd = dup(ns_fd);
|
|
EXPECT_OK(cap_fd);
|
|
EXPECT_OK(cap_rights_limit(cap_fd, &r_rwlstat));
|
|
int cap_fd_setns = dup(ns_fd);
|
|
EXPECT_OK(cap_fd_setns);
|
|
EXPECT_OK(cap_rights_limit(cap_fd_setns, &r_rwlstatns));
|
|
EXPECT_NOTCAPABLE(setns(cap_fd, CLONE_NEWUTS));
|
|
EXPECT_OK(setns(cap_fd_setns, CLONE_NEWUTS));
|
|
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
|
|
// No setns(2) but unshare(2) is allowed.
|
|
EXPECT_CAPMODE(setns(ns_fd, CLONE_NEWUTS));
|
|
EXPECT_OK(unshare(CLONE_NEWUTS));
|
|
}
|
|
|
|
static void SendFD(int fd, int over) {
|
|
struct msghdr mh;
|
|
mh.msg_name = NULL; // No address needed
|
|
mh.msg_namelen = 0;
|
|
char buffer1[1024];
|
|
struct iovec iov[1];
|
|
iov[0].iov_base = buffer1;
|
|
iov[0].iov_len = sizeof(buffer1);
|
|
mh.msg_iov = iov;
|
|
mh.msg_iovlen = 1;
|
|
char buffer2[1024];
|
|
mh.msg_control = buffer2;
|
|
mh.msg_controllen = CMSG_LEN(sizeof(int));
|
|
struct cmsghdr *cmptr = CMSG_FIRSTHDR(&mh);
|
|
cmptr->cmsg_level = SOL_SOCKET;
|
|
cmptr->cmsg_type = SCM_RIGHTS;
|
|
cmptr->cmsg_len = CMSG_LEN(sizeof(int));
|
|
*(int *)CMSG_DATA(cmptr) = fd;
|
|
buffer1[0] = 0;
|
|
iov[0].iov_len = 1;
|
|
int rc = sendmsg(over, &mh, 0);
|
|
EXPECT_OK(rc);
|
|
}
|
|
|
|
static int ReceiveFD(int over) {
|
|
struct msghdr mh;
|
|
mh.msg_name = NULL; // No address needed
|
|
mh.msg_namelen = 0;
|
|
char buffer1[1024];
|
|
struct iovec iov[1];
|
|
iov[0].iov_base = buffer1;
|
|
iov[0].iov_len = sizeof(buffer1);
|
|
mh.msg_iov = iov;
|
|
mh.msg_iovlen = 1;
|
|
char buffer2[1024];
|
|
mh.msg_control = buffer2;
|
|
mh.msg_controllen = sizeof(buffer2);
|
|
int rc = recvmsg(over, &mh, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_LE(CMSG_LEN(sizeof(int)), mh.msg_controllen);
|
|
struct cmsghdr *cmptr = CMSG_FIRSTHDR(&mh);
|
|
int fd = *(int*)CMSG_DATA(cmptr);
|
|
EXPECT_EQ(CMSG_LEN(sizeof(int)), cmptr->cmsg_len);
|
|
cmptr = CMSG_NXTHDR(&mh, cmptr);
|
|
EXPECT_TRUE(cmptr == NULL);
|
|
return fd;
|
|
}
|
|
|
|
static int shared_pd = -1;
|
|
static int shared_sock_fds[2];
|
|
|
|
static int ChildFunc(void *arg) {
|
|
// This function is running in a new PID namespace, and so is pid 1.
|
|
if (verbose) fprintf(stderr, " ChildFunc: pid=%d, ppid=%d\n", getpid_(), getppid());
|
|
EXPECT_EQ(1, getpid_());
|
|
EXPECT_EQ(0, getppid());
|
|
|
|
// The shared process descriptor is outside our namespace, so we cannot
|
|
// get its pid.
|
|
if (verbose) fprintf(stderr, " ChildFunc: shared_pd=%d\n", shared_pd);
|
|
pid_t shared_child = -1;
|
|
EXPECT_OK(pdgetpid(shared_pd, &shared_child));
|
|
if (verbose) fprintf(stderr, " ChildFunc: corresponding pid=%d\n", shared_child);
|
|
EXPECT_EQ(0, shared_child);
|
|
|
|
// But we can pdkill() it even so.
|
|
if (verbose) fprintf(stderr, " ChildFunc: call pdkill(pd=%d)\n", shared_pd);
|
|
EXPECT_OK(pdkill(shared_pd, SIGINT));
|
|
|
|
int pd;
|
|
pid_t child = pdfork(&pd, 0);
|
|
EXPECT_OK(child);
|
|
if (child == 0) {
|
|
// Child: expect pid 2.
|
|
if (verbose) fprintf(stderr, " child of ChildFunc: pid=%d, ppid=%d\n", getpid_(), getppid());
|
|
EXPECT_EQ(2, getpid_());
|
|
EXPECT_EQ(1, getppid());
|
|
while (true) {
|
|
if (verbose) fprintf(stderr, " child of ChildFunc: \"I aten't dead\"\n");
|
|
sleep(1);
|
|
}
|
|
exit(0);
|
|
}
|
|
EXPECT_EQ(2, child);
|
|
EXPECT_PID_ALIVE(child);
|
|
if (verbose) fprintf(stderr, " ChildFunc: pdfork() -> pd=%d, corresponding pid=%d state='%c'\n",
|
|
pd, child, ProcessState(child));
|
|
|
|
pid_t pid;
|
|
EXPECT_OK(pdgetpid(pd, &pid));
|
|
EXPECT_EQ(child, pid);
|
|
|
|
sleep(2);
|
|
|
|
// Send the process descriptor over UNIX domain socket back to parent.
|
|
SendFD(pd, shared_sock_fds[1]);
|
|
|
|
// Wait for death of (grand)child, killed by our parent.
|
|
if (verbose) fprintf(stderr, " ChildFunc: wait on pid=%d\n", child);
|
|
int status;
|
|
EXPECT_EQ(child, wait4(child, &status, __WALL, NULL));
|
|
|
|
if (verbose) fprintf(stderr, " ChildFunc: return 0\n");
|
|
return 0;
|
|
}
|
|
|
|
#define STACK_SIZE (1024 * 1024)
|
|
static char child_stack[STACK_SIZE];
|
|
|
|
// TODO(drysdale): fork into a user namespace first so REQUIRE_ROOT can be removed.
|
|
TEST(Linux, PidNamespacePdFork) {
|
|
REQUIRE_ROOT();
|
|
// Pass process descriptors in both directions across a PID namespace boundary.
|
|
// pdfork() off a child before we start, holding its process descriptor in a global
|
|
// variable that's accessible to children.
|
|
pid_t firstborn = pdfork(&shared_pd, 0);
|
|
EXPECT_OK(firstborn);
|
|
if (firstborn == 0) {
|
|
while (true) {
|
|
if (verbose) fprintf(stderr, " Firstborn: \"I aten't dead\"\n");
|
|
sleep(1);
|
|
}
|
|
exit(0);
|
|
}
|
|
EXPECT_PID_ALIVE(firstborn);
|
|
if (verbose) fprintf(stderr, "Parent: pre-pdfork()ed pd=%d, pid=%d state='%c'\n",
|
|
shared_pd, firstborn, ProcessState(firstborn));
|
|
sleep(2);
|
|
|
|
// Prepare sockets to communicate with child process.
|
|
EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, shared_sock_fds));
|
|
|
|
// Clone into a child process with a new pid namespace.
|
|
pid_t child = clone(ChildFunc, child_stack + STACK_SIZE,
|
|
CLONE_FILES|CLONE_NEWPID|SIGCHLD, NULL);
|
|
EXPECT_OK(child);
|
|
EXPECT_PID_ALIVE(child);
|
|
if (verbose) fprintf(stderr, "Parent: child is %d state='%c'\n", child, ProcessState(child));
|
|
|
|
// Ensure the child runs. First thing it does is to kill our firstborn, using shared_pd.
|
|
sleep(1);
|
|
EXPECT_PID_DEAD(firstborn);
|
|
|
|
// But we can still retrieve firstborn's PID, as it's not been reaped yet.
|
|
pid_t child0;
|
|
EXPECT_OK(pdgetpid(shared_pd, &child0));
|
|
EXPECT_EQ(firstborn, child0);
|
|
if (verbose) fprintf(stderr, "Parent: check on firstborn: pdgetpid(pd=%d) -> child=%d state='%c'\n",
|
|
shared_pd, child0, ProcessState(child0));
|
|
|
|
// Now reap it.
|
|
int status;
|
|
EXPECT_EQ(firstborn, waitpid(firstborn, &status, __WALL));
|
|
|
|
// Get the process descriptor of the child-of-child via socket transfer.
|
|
int grandchild_pd = ReceiveFD(shared_sock_fds[0]);
|
|
|
|
// Our notion of the pid associated with the grandchild is in the main PID namespace.
|
|
pid_t grandchild;
|
|
EXPECT_OK(pdgetpid(grandchild_pd, &grandchild));
|
|
EXPECT_NE(2, grandchild);
|
|
if (verbose) fprintf(stderr, "Parent: pre-pdkill: pdgetpid(grandchild_pd=%d) -> grandchild=%d state='%c'\n",
|
|
grandchild_pd, grandchild, ProcessState(grandchild));
|
|
EXPECT_PID_ALIVE(grandchild);
|
|
|
|
// Kill the grandchild via the process descriptor.
|
|
EXPECT_OK(pdkill(grandchild_pd, SIGINT));
|
|
usleep(10000);
|
|
if (verbose) fprintf(stderr, "Parent: post-pdkill: pdgetpid(grandchild_pd=%d) -> grandchild=%d state='%c'\n",
|
|
grandchild_pd, grandchild, ProcessState(grandchild));
|
|
EXPECT_PID_DEAD(grandchild);
|
|
|
|
sleep(2);
|
|
|
|
// Wait for the child.
|
|
EXPECT_EQ(child, waitpid(child, &status, WNOHANG));
|
|
int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
|
|
close(shared_sock_fds[0]);
|
|
close(shared_sock_fds[1]);
|
|
close(shared_pd);
|
|
close(grandchild_pd);
|
|
}
|
|
|
|
int NSInit(void *data) {
|
|
// This function is running in a new PID namespace, and so is pid 1.
|
|
if (verbose) fprintf(stderr, " NSInit: pid=%d, ppid=%d\n", getpid_(), getppid());
|
|
EXPECT_EQ(1, getpid_());
|
|
EXPECT_EQ(0, getppid());
|
|
|
|
int pd;
|
|
pid_t child = pdfork(&pd, 0);
|
|
EXPECT_OK(child);
|
|
if (child == 0) {
|
|
// Child: loop forever until terminated.
|
|
if (verbose) fprintf(stderr, " child of NSInit: pid=%d, ppid=%d\n", getpid_(), getppid());
|
|
while (true) {
|
|
if (verbose) fprintf(stderr, " child of NSInit: \"I aten't dead\"\n");
|
|
usleep(100000);
|
|
}
|
|
exit(0);
|
|
}
|
|
EXPECT_EQ(2, child);
|
|
EXPECT_PID_ALIVE(child);
|
|
if (verbose) fprintf(stderr, " NSInit: pdfork() -> pd=%d, corresponding pid=%d state='%c'\n",
|
|
pd, child, ProcessState(child));
|
|
sleep(1);
|
|
|
|
// Send the process descriptor over UNIX domain socket back to parent.
|
|
SendFD(pd, shared_sock_fds[1]);
|
|
close(pd);
|
|
|
|
// Wait for a byte back in the other direction.
|
|
int value;
|
|
if (verbose) fprintf(stderr, " NSInit: block waiting for value\n");
|
|
read(shared_sock_fds[1], &value, sizeof(value));
|
|
|
|
if (verbose) fprintf(stderr, " NSInit: return 0\n");
|
|
return 0;
|
|
}
|
|
|
|
TEST(Linux, DeadNSInit) {
|
|
REQUIRE_ROOT();
|
|
|
|
// Prepare sockets to communicate with child process.
|
|
EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, shared_sock_fds));
|
|
|
|
// Clone into a child process with a new pid namespace.
|
|
pid_t child = clone(NSInit, child_stack + STACK_SIZE,
|
|
CLONE_FILES|CLONE_NEWPID|SIGCHLD, NULL);
|
|
usleep(10000);
|
|
EXPECT_OK(child);
|
|
EXPECT_PID_ALIVE(child);
|
|
if (verbose) fprintf(stderr, "Parent: child is %d state='%c'\n", child, ProcessState(child));
|
|
|
|
// Get the process descriptor of the child-of-child via socket transfer.
|
|
int grandchild_pd = ReceiveFD(shared_sock_fds[0]);
|
|
pid_t grandchild;
|
|
EXPECT_OK(pdgetpid(grandchild_pd, &grandchild));
|
|
if (verbose) fprintf(stderr, "Parent: grandchild is %d state='%c'\n", grandchild, ProcessState(grandchild));
|
|
|
|
// Send an int to the child to trigger its termination. Grandchild should also
|
|
// go, as its init process is gone.
|
|
int zero = 0;
|
|
if (verbose) fprintf(stderr, "Parent: write 0 to pipe\n");
|
|
write(shared_sock_fds[0], &zero, sizeof(zero));
|
|
EXPECT_PID_ZOMBIE(child);
|
|
EXPECT_PID_GONE(grandchild);
|
|
|
|
// Wait for the child.
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, WNOHANG));
|
|
int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
EXPECT_PID_GONE(child);
|
|
|
|
close(shared_sock_fds[0]);
|
|
close(shared_sock_fds[1]);
|
|
close(grandchild_pd);
|
|
|
|
if (verbose) {
|
|
fprintf(stderr, "Parent: child %d in state='%c'\n", child, ProcessState(child));
|
|
fprintf(stderr, "Parent: grandchild %d in state='%c'\n", grandchild, ProcessState(grandchild));
|
|
}
|
|
}
|
|
|
|
TEST(Linux, DeadNSInit2) {
|
|
REQUIRE_ROOT();
|
|
|
|
// Prepare sockets to communicate with child process.
|
|
EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, shared_sock_fds));
|
|
|
|
// Clone into a child process with a new pid namespace.
|
|
pid_t child = clone(NSInit, child_stack + STACK_SIZE,
|
|
CLONE_FILES|CLONE_NEWPID|SIGCHLD, NULL);
|
|
usleep(10000);
|
|
EXPECT_OK(child);
|
|
EXPECT_PID_ALIVE(child);
|
|
if (verbose) fprintf(stderr, "Parent: child is %d state='%c'\n", child, ProcessState(child));
|
|
|
|
// Get the process descriptor of the child-of-child via socket transfer.
|
|
int grandchild_pd = ReceiveFD(shared_sock_fds[0]);
|
|
pid_t grandchild;
|
|
EXPECT_OK(pdgetpid(grandchild_pd, &grandchild));
|
|
if (verbose) fprintf(stderr, "Parent: grandchild is %d state='%c'\n", grandchild, ProcessState(grandchild));
|
|
|
|
// Kill the grandchild
|
|
EXPECT_OK(pdkill(grandchild_pd, SIGINT));
|
|
usleep(10000);
|
|
EXPECT_PID_ZOMBIE(grandchild);
|
|
// Close the process descriptor, so there are now no procdesc references to grandchild.
|
|
close(grandchild_pd);
|
|
|
|
// Send an int to the child to trigger its termination. Grandchild should also
|
|
// go, as its init process is gone.
|
|
int zero = 0;
|
|
if (verbose) fprintf(stderr, "Parent: write 0 to pipe\n");
|
|
write(shared_sock_fds[0], &zero, sizeof(zero));
|
|
EXPECT_PID_ZOMBIE(child);
|
|
EXPECT_PID_GONE(grandchild);
|
|
|
|
// Wait for the child.
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, WNOHANG));
|
|
int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
|
|
close(shared_sock_fds[0]);
|
|
close(shared_sock_fds[1]);
|
|
|
|
if (verbose) {
|
|
fprintf(stderr, "Parent: child %d in state='%c'\n", child, ProcessState(child));
|
|
fprintf(stderr, "Parent: grandchild %d in state='%c'\n", grandchild, ProcessState(grandchild));
|
|
}
|
|
}
|
|
|
|
#ifdef __x86_64__
|
|
FORK_TEST(Linux, CheckHighWord) {
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
|
|
int rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(1, rc); // no_new_privs = 1
|
|
|
|
// Set some of the high 32-bits of argument zero.
|
|
uint64_t big_cmd = PR_GET_NO_NEW_PRIVS | 0x100000000LL;
|
|
EXPECT_CAPMODE(syscall(__NR_prctl, big_cmd, 0, 0, 0, 0));
|
|
}
|
|
#endif
|
|
|
|
FORK_TEST(Linux, PrctlOpenatBeneath) {
|
|
// Set no_new_privs = 1
|
|
EXPECT_OK(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
|
|
int rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(1, rc); // no_new_privs = 1
|
|
|
|
// Set openat-beneath mode
|
|
EXPECT_OK(prctl(PR_SET_OPENAT_BENEATH, 1, 0, 0, 0));
|
|
rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(1, rc); // openat_beneath = 1
|
|
|
|
// Clear openat-beneath mode
|
|
EXPECT_OK(prctl(PR_SET_OPENAT_BENEATH, 0, 0, 0, 0));
|
|
rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(0, rc); // openat_beneath = 0
|
|
|
|
EXPECT_OK(cap_enter()); // Enter capability mode
|
|
|
|
// Expect to be in openat_beneath mode
|
|
rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(1, rc); // openat_beneath = 1
|
|
|
|
// Expect this to be immutable.
|
|
EXPECT_CAPMODE(prctl(PR_SET_OPENAT_BENEATH, 0, 0, 0, 0));
|
|
rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(1, rc); // openat_beneath = 1
|
|
|
|
}
|
|
|
|
FORK_TEST(Linux, NoNewPrivs) {
|
|
if (getuid() == 0) {
|
|
// If root, drop CAP_SYS_ADMIN POSIX.1e capability.
|
|
struct __user_cap_header_struct hdr;
|
|
hdr.version = _LINUX_CAPABILITY_VERSION_3;
|
|
hdr.pid = getpid_();
|
|
struct __user_cap_data_struct data[3];
|
|
EXPECT_OK(capget(&hdr, &data[0]));
|
|
data[0].effective &= ~(1 << CAP_SYS_ADMIN);
|
|
data[0].permitted &= ~(1 << CAP_SYS_ADMIN);
|
|
data[0].inheritable &= ~(1 << CAP_SYS_ADMIN);
|
|
EXPECT_OK(capset(&hdr, &data[0]));
|
|
}
|
|
int rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(0, rc); // no_new_privs == 0
|
|
|
|
// Can't enter seccomp-bpf mode with no_new_privs == 0
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
|
|
};
|
|
struct sock_fprog bpf;
|
|
bpf.len = (sizeof(filter) / sizeof(filter[0]));
|
|
bpf.filter = filter;
|
|
rc = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bpf, 0, 0);
|
|
EXPECT_EQ(-1, rc);
|
|
EXPECT_EQ(EACCES, errno);
|
|
|
|
// Set no_new_privs = 1
|
|
EXPECT_OK(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
|
|
rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
|
|
EXPECT_OK(rc);
|
|
EXPECT_EQ(1, rc); // no_new_privs = 1
|
|
|
|
// Can now turn on seccomp mode
|
|
EXPECT_OK(prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bpf, 0, 0));
|
|
}
|
|
|
|
/* Macros for BPF generation */
|
|
#define BPF_RETURN_ERRNO(err) \
|
|
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ERRNO | (err & 0xFFFF))
|
|
#define BPF_KILL_PROCESS \
|
|
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
|
|
#define BPF_ALLOW \
|
|
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
|
|
#define EXAMINE_SYSCALL \
|
|
BPF_STMT(BPF_LD+BPF_W+BPF_ABS, offsetof(struct seccomp_data, nr))
|
|
#define ALLOW_SYSCALL(name) \
|
|
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
|
|
BPF_ALLOW
|
|
#define KILL_SYSCALL(name) \
|
|
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
|
|
BPF_KILL_PROCESS
|
|
#define FAIL_SYSCALL(name, err) \
|
|
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
|
|
BPF_RETURN_ERRNO(err)
|
|
|
|
TEST(Linux, CapModeWithBPF) {
|
|
pid_t child = fork();
|
|
EXPECT_OK(child);
|
|
if (child == 0) {
|
|
int fd = open(TmpFile("cap_bpf_capmode"), O_CREAT|O_RDWR, 0644);
|
|
cap_rights_t rights;
|
|
cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_FSYNC);
|
|
EXPECT_OK(cap_rights_limit(fd, &rights));
|
|
|
|
struct sock_filter filter[] = { EXAMINE_SYSCALL,
|
|
FAIL_SYSCALL(fchmod, ENOMEM),
|
|
FAIL_SYSCALL(fstat, ENOEXEC),
|
|
ALLOW_SYSCALL(close),
|
|
KILL_SYSCALL(fsync),
|
|
BPF_ALLOW };
|
|
struct sock_fprog bpf = {.len = (sizeof(filter) / sizeof(filter[0])),
|
|
.filter = filter};
|
|
// Set up seccomp-bpf first.
|
|
EXPECT_OK(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
|
|
EXPECT_OK(prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bpf, 0, 0));
|
|
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
|
|
// fchmod is allowed by Capsicum, but failed by BPF.
|
|
EXPECT_SYSCALL_FAIL(ENOMEM, fchmod(fd, 0644));
|
|
// open is allowed by BPF, but failed by Capsicum
|
|
EXPECT_SYSCALL_FAIL(ECAPMODE, open(TmpFile("cap_bpf_capmode"), O_RDONLY));
|
|
// fstat is failed by both BPF and Capsicum; tie-break is on errno
|
|
struct stat buf;
|
|
EXPECT_SYSCALL_FAIL(ENOEXEC, fstat(fd, &buf));
|
|
// fsync is allowed by Capsicum, but BPF's SIGSYS generation take precedence
|
|
fsync(fd); // terminate with unhandled SIGSYS
|
|
exit(0);
|
|
}
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
EXPECT_TRUE(WIFSIGNALED(status));
|
|
EXPECT_EQ(SIGSYS, WTERMSIG(status));
|
|
unlink(TmpFile("cap_bpf_capmode"));
|
|
}
|
|
|
|
TEST(Linux, AIO) {
|
|
int fd = open(TmpFile("cap_aio"), O_CREAT|O_RDWR, 0644);
|
|
EXPECT_OK(fd);
|
|
|
|
cap_rights_t r_rs;
|
|
cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
|
|
cap_rights_t r_ws;
|
|
cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
|
|
cap_rights_t r_rwssync;
|
|
cap_rights_init(&r_rwssync, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_FSYNC);
|
|
|
|
int cap_ro = dup(fd);
|
|
EXPECT_OK(cap_ro);
|
|
EXPECT_OK(cap_rights_limit(cap_ro, &r_rs));
|
|
EXPECT_OK(cap_ro);
|
|
int cap_wo = dup(fd);
|
|
EXPECT_OK(cap_wo);
|
|
EXPECT_OK(cap_rights_limit(cap_wo, &r_ws));
|
|
EXPECT_OK(cap_wo);
|
|
int cap_all = dup(fd);
|
|
EXPECT_OK(cap_all);
|
|
EXPECT_OK(cap_rights_limit(cap_all, &r_rwssync));
|
|
EXPECT_OK(cap_all);
|
|
|
|
// Linux: io_setup, io_submit, io_getevents, io_cancel, io_destroy
|
|
aio_context_t ctx = 0;
|
|
EXPECT_OK(syscall(__NR_io_setup, 10, &ctx));
|
|
|
|
unsigned char buffer[32] = {1, 2, 3, 4};
|
|
struct iocb req;
|
|
memset(&req, 0, sizeof(req));
|
|
req.aio_reqprio = 0;
|
|
req.aio_fildes = fd;
|
|
uintptr_t bufaddr = (uintptr_t)buffer;
|
|
req.aio_buf = (__u64)bufaddr;
|
|
req.aio_nbytes = 4;
|
|
req.aio_offset = 0;
|
|
struct iocb* reqs[1] = {&req};
|
|
|
|
// Write operation
|
|
req.aio_lio_opcode = IOCB_CMD_PWRITE;
|
|
req.aio_fildes = cap_ro;
|
|
EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
req.aio_fildes = cap_wo;
|
|
EXPECT_OK(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
|
|
// Sync operation
|
|
req.aio_lio_opcode = IOCB_CMD_FSYNC;
|
|
EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
req.aio_lio_opcode = IOCB_CMD_FDSYNC;
|
|
EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
// Even with CAP_FSYNC, turns out fsync/fdsync aren't implemented
|
|
req.aio_fildes = cap_all;
|
|
EXPECT_FAIL_NOT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
req.aio_lio_opcode = IOCB_CMD_FSYNC;
|
|
EXPECT_FAIL_NOT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
|
|
// Read operation
|
|
req.aio_lio_opcode = IOCB_CMD_PREAD;
|
|
req.aio_fildes = cap_wo;
|
|
EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
req.aio_fildes = cap_ro;
|
|
EXPECT_OK(syscall(__NR_io_submit, ctx, 1, reqs));
|
|
|
|
EXPECT_OK(syscall(__NR_io_destroy, ctx));
|
|
|
|
close(cap_all);
|
|
close(cap_wo);
|
|
close(cap_ro);
|
|
close(fd);
|
|
unlink(TmpFile("cap_aio"));
|
|
}
|
|
|
|
#ifndef KCMP_FILE
|
|
#define KCMP_FILE 0
|
|
#endif
|
|
TEST(Linux, Kcmp) {
|
|
// This requires CONFIG_CHECKPOINT_RESTORE in kernel config.
|
|
int fd = open("/etc/passwd", O_RDONLY);
|
|
EXPECT_OK(fd);
|
|
pid_t parent = getpid_();
|
|
|
|
errno = 0;
|
|
int rc = syscall(__NR_kcmp, parent, parent, KCMP_FILE, fd, fd);
|
|
if (rc == -1 && errno == ENOSYS) {
|
|
TEST_SKIPPED("kcmp(2) gives -ENOSYS");
|
|
return;
|
|
}
|
|
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
// Child: limit rights on FD.
|
|
child = getpid_();
|
|
EXPECT_OK(syscall(__NR_kcmp, parent, child, KCMP_FILE, fd, fd));
|
|
cap_rights_t rights;
|
|
cap_rights_init(&rights, CAP_READ, CAP_WRITE);
|
|
EXPECT_OK(cap_rights_limit(fd, &rights));
|
|
// A capability wrapping a normal FD is different (from a kcmp(2) perspective)
|
|
// than the original file.
|
|
EXPECT_NE(0, syscall(__NR_kcmp, parent, child, KCMP_FILE, fd, fd));
|
|
exit(HasFailure());
|
|
}
|
|
// Wait for the child.
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
|
|
close(fd);
|
|
}
|
|
|
|
TEST(Linux, ProcFS) {
|
|
cap_rights_t rights;
|
|
cap_rights_init(&rights, CAP_READ, CAP_SEEK);
|
|
int fd = open("/etc/passwd", O_RDONLY);
|
|
EXPECT_OK(fd);
|
|
lseek(fd, 4, SEEK_SET);
|
|
int cap = dup(fd);
|
|
EXPECT_OK(cap);
|
|
EXPECT_OK(cap_rights_limit(cap, &rights));
|
|
pid_t me = getpid_();
|
|
|
|
char buffer[1024];
|
|
sprintf(buffer, "/proc/%d/fdinfo/%d", me, cap);
|
|
int procfd = open(buffer, O_RDONLY);
|
|
EXPECT_OK(procfd) << " failed to open " << buffer;
|
|
if (procfd < 0) return;
|
|
int proccap = dup(procfd);
|
|
EXPECT_OK(proccap);
|
|
EXPECT_OK(cap_rights_limit(proccap, &rights));
|
|
|
|
EXPECT_OK(read(proccap, buffer, sizeof(buffer)));
|
|
// The fdinfo should include the file pos of the underlying file
|
|
EXPECT_NE((char*)NULL, strstr(buffer, "pos:\t4"));
|
|
// ...and the rights of the Capsicum capability.
|
|
EXPECT_NE((char*)NULL, strstr(buffer, "rights:\t0x"));
|
|
|
|
close(procfd);
|
|
close(proccap);
|
|
close(cap);
|
|
close(fd);
|
|
}
|
|
|
|
FORK_TEST(Linux, ProcessClocks) {
|
|
pid_t self = getpid_();
|
|
pid_t child = fork();
|
|
EXPECT_OK(child);
|
|
if (child == 0) {
|
|
child = getpid_();
|
|
usleep(100000);
|
|
exit(0);
|
|
}
|
|
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
|
|
// Nefariously build a clock ID for the child's CPU time.
|
|
// This relies on knowledge of the internal layout of clock IDs.
|
|
clockid_t child_clock;
|
|
child_clock = ((~child) << 3) | 0x0;
|
|
struct timespec ts;
|
|
memset(&ts, 0, sizeof(ts));
|
|
|
|
// TODO(drysdale): Should not be possible to retrieve info about a
|
|
// different process, as the PID global namespace should be locked
|
|
// down.
|
|
EXPECT_OK(clock_gettime(child_clock, &ts));
|
|
if (verbose) fprintf(stderr, "[parent: %d] clock_gettime(child=%d->0x%08x) is %ld.%09ld \n",
|
|
self, child, child_clock, (long)ts.tv_sec, (long)ts.tv_nsec);
|
|
|
|
child_clock = ((~1) << 3) | 0x0;
|
|
memset(&ts, 0, sizeof(ts));
|
|
EXPECT_OK(clock_gettime(child_clock, &ts));
|
|
if (verbose) fprintf(stderr, "[parent: %d] clock_gettime(init=1->0x%08x) is %ld.%09ld \n",
|
|
self, child_clock, (long)ts.tv_sec, (long)ts.tv_nsec);
|
|
|
|
// Orphan the child.
|
|
}
|
|
|
|
TEST(Linux, SetLease) {
|
|
int fd_all = open(TmpFile("cap_lease"), O_CREAT|O_RDWR, 0644);
|
|
EXPECT_OK(fd_all);
|
|
int fd_rw = dup(fd_all);
|
|
EXPECT_OK(fd_rw);
|
|
|
|
cap_rights_t r_all;
|
|
cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_FLOCK, CAP_FSIGNAL);
|
|
EXPECT_OK(cap_rights_limit(fd_all, &r_all));
|
|
|
|
cap_rights_t r_rw;
|
|
cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
|
|
EXPECT_OK(cap_rights_limit(fd_rw, &r_rw));
|
|
|
|
EXPECT_NOTCAPABLE(fcntl(fd_rw, F_SETLEASE, F_WRLCK));
|
|
EXPECT_NOTCAPABLE(fcntl(fd_rw, F_GETLEASE));
|
|
|
|
if (!tmpdir_on_tmpfs) { // tmpfs doesn't support leases
|
|
EXPECT_OK(fcntl(fd_all, F_SETLEASE, F_WRLCK));
|
|
EXPECT_EQ(F_WRLCK, fcntl(fd_all, F_GETLEASE));
|
|
|
|
EXPECT_OK(fcntl(fd_all, F_SETLEASE, F_UNLCK, 0));
|
|
EXPECT_EQ(F_UNLCK, fcntl(fd_all, F_GETLEASE));
|
|
}
|
|
close(fd_all);
|
|
close(fd_rw);
|
|
unlink(TmpFile("cap_lease"));
|
|
}
|
|
|
|
TEST(Linux, InvalidRightsSyscall) {
|
|
int fd = open(TmpFile("cap_invalid_rights"), O_RDONLY|O_CREAT, 0644);
|
|
EXPECT_OK(fd);
|
|
|
|
cap_rights_t rights;
|
|
cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FCHMOD, CAP_FSTAT);
|
|
|
|
// Use the raw syscall throughout.
|
|
EXPECT_EQ(0, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 0));
|
|
|
|
// Directly access the syscall, and find all unseemly manner of use for it.
|
|
// - Invalid flags
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 1));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
// - Specify an fcntl subright, but no CAP_FCNTL set
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, CAP_FCNTL_GETFL, 0, NULL, 0));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
// - Specify an ioctl subright, but no CAP_IOCTL set
|
|
unsigned int ioctl1 = 1;
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 1, &ioctl1, 0));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
// - N ioctls, but null pointer passed
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 1, NULL, 0));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
// - Invalid nioctls
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, -2, NULL, 0));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
// - Null primary rights
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, NULL, 0, 0, NULL, 0));
|
|
EXPECT_EQ(EFAULT, errno);
|
|
// - Invalid index bitmask
|
|
rights.cr_rights[0] |= 3ULL << 57;
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 0));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
// - Invalid version
|
|
rights.cr_rights[0] |= 2ULL << 62;
|
|
EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 0));
|
|
EXPECT_EQ(EINVAL, errno);
|
|
|
|
close(fd);
|
|
unlink(TmpFile("cap_invalid_rights"));
|
|
}
|
|
|
|
FORK_TEST_ON(Linux, OpenByHandleAt, TmpFile("cap_openbyhandle_testfile")) {
|
|
REQUIRE_ROOT();
|
|
int dir = open(tmpdir.c_str(), O_RDONLY);
|
|
EXPECT_OK(dir);
|
|
int fd = openat(dir, "cap_openbyhandle_testfile", O_RDWR|O_CREAT, 0644);
|
|
EXPECT_OK(fd);
|
|
const char* message = "Saved text";
|
|
EXPECT_OK(write(fd, message, strlen(message)));
|
|
close(fd);
|
|
|
|
struct file_handle* fhandle = (struct file_handle*)malloc(sizeof(struct file_handle) + MAX_HANDLE_SZ);
|
|
fhandle->handle_bytes = MAX_HANDLE_SZ;
|
|
int mount_id;
|
|
EXPECT_OK(name_to_handle_at(dir, "cap_openbyhandle_testfile", fhandle, &mount_id, 0));
|
|
|
|
fd = open_by_handle_at(dir, fhandle, O_RDONLY);
|
|
EXPECT_OK(fd);
|
|
char buffer[200];
|
|
EXPECT_OK(read(fd, buffer, 199));
|
|
EXPECT_EQ(std::string(message), std::string(buffer));
|
|
close(fd);
|
|
|
|
// Cannot issue open_by_handle_at after entering capability mode.
|
|
cap_enter();
|
|
EXPECT_CAPMODE(open_by_handle_at(dir, fhandle, O_RDONLY));
|
|
|
|
close(dir);
|
|
}
|
|
|
|
int getrandom_(void *buf, size_t buflen, unsigned int flags) {
|
|
#ifdef __NR_getrandom
|
|
return syscall(__NR_getrandom, buf, buflen, flags);
|
|
#else
|
|
errno = ENOSYS;
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
|
|
#include <linux/random.h> // Requires 3.17 kernel
|
|
FORK_TEST(Linux, GetRandom) {
|
|
EXPECT_OK(cap_enter());
|
|
unsigned char buffer[1024];
|
|
unsigned char buffer2[1024];
|
|
EXPECT_OK(getrandom_(buffer, sizeof(buffer), GRND_NONBLOCK));
|
|
EXPECT_OK(getrandom_(buffer2, sizeof(buffer2), GRND_NONBLOCK));
|
|
EXPECT_NE(0, memcmp(buffer, buffer2, sizeof(buffer)));
|
|
}
|
|
#endif
|
|
|
|
int memfd_create_(const char *name, unsigned int flags) {
|
|
#ifdef __NR_memfd_create
|
|
return syscall(__NR_memfd_create, name, flags);
|
|
#else
|
|
errno = ENOSYS;
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
|
|
#include <linux/memfd.h> // Requires 3.17 kernel
|
|
TEST(Linux, MemFDDeathTest) {
|
|
int memfd = memfd_create_("capsicum-test", MFD_ALLOW_SEALING);
|
|
if (memfd == -1 && errno == ENOSYS) {
|
|
TEST_SKIPPED("memfd_create(2) gives -ENOSYS");
|
|
return;
|
|
}
|
|
const int LEN = 16;
|
|
EXPECT_OK(ftruncate(memfd, LEN));
|
|
int memfd_ro = dup(memfd);
|
|
int memfd_rw = dup(memfd);
|
|
EXPECT_OK(memfd_ro);
|
|
EXPECT_OK(memfd_rw);
|
|
cap_rights_t rights;
|
|
EXPECT_OK(cap_rights_limit(memfd_ro, cap_rights_init(&rights, CAP_MMAP_R, CAP_FSTAT)));
|
|
EXPECT_OK(cap_rights_limit(memfd_rw, cap_rights_init(&rights, CAP_MMAP_RW, CAP_FCHMOD)));
|
|
|
|
unsigned char *p_ro = (unsigned char *)mmap(NULL, LEN, PROT_READ, MAP_SHARED, memfd_ro, 0);
|
|
EXPECT_NE((unsigned char *)MAP_FAILED, p_ro);
|
|
unsigned char *p_rw = (unsigned char *)mmap(NULL, LEN, PROT_READ|PROT_WRITE, MAP_SHARED, memfd_rw, 0);
|
|
EXPECT_NE((unsigned char *)MAP_FAILED, p_rw);
|
|
EXPECT_EQ(MAP_FAILED,
|
|
mmap(NULL, LEN, PROT_READ|PROT_WRITE, MAP_SHARED, memfd_ro, 0));
|
|
|
|
*p_rw = 42;
|
|
EXPECT_EQ(42, *p_ro);
|
|
EXPECT_DEATH(*p_ro = 42, "");
|
|
|
|
#ifndef F_ADD_SEALS
|
|
// Hack for when libc6 does not yet include the updated linux/fcntl.h from kernel 3.17
|
|
#define _F_LINUX_SPECIFIC_BASE F_SETLEASE
|
|
#define F_ADD_SEALS (_F_LINUX_SPECIFIC_BASE + 9)
|
|
#define F_GET_SEALS (_F_LINUX_SPECIFIC_BASE + 10)
|
|
#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
|
|
#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
|
|
#define F_SEAL_GROW 0x0004 /* prevent file from growing */
|
|
#define F_SEAL_WRITE 0x0008 /* prevent writes */
|
|
#endif
|
|
|
|
// Reading the seal information requires CAP_FSTAT.
|
|
int seals = fcntl(memfd, F_GET_SEALS);
|
|
EXPECT_OK(seals);
|
|
if (verbose) fprintf(stderr, "seals are %08x on base fd\n", seals);
|
|
int seals_ro = fcntl(memfd_ro, F_GET_SEALS);
|
|
EXPECT_EQ(seals, seals_ro);
|
|
if (verbose) fprintf(stderr, "seals are %08x on read-only fd\n", seals_ro);
|
|
int seals_rw = fcntl(memfd_rw, F_GET_SEALS);
|
|
EXPECT_NOTCAPABLE(seals_rw);
|
|
|
|
// Fail to seal as a writable mapping exists.
|
|
EXPECT_EQ(-1, fcntl(memfd_rw, F_ADD_SEALS, F_SEAL_WRITE));
|
|
EXPECT_EQ(EBUSY, errno);
|
|
*p_rw = 42;
|
|
|
|
// Seal the rw version; need to unmap first.
|
|
munmap(p_rw, LEN);
|
|
munmap(p_ro, LEN);
|
|
EXPECT_OK(fcntl(memfd_rw, F_ADD_SEALS, F_SEAL_WRITE));
|
|
|
|
seals = fcntl(memfd, F_GET_SEALS);
|
|
EXPECT_OK(seals);
|
|
if (verbose) fprintf(stderr, "seals are %08x on base fd\n", seals);
|
|
seals_ro = fcntl(memfd_ro, F_GET_SEALS);
|
|
EXPECT_EQ(seals, seals_ro);
|
|
if (verbose) fprintf(stderr, "seals are %08x on read-only fd\n", seals_ro);
|
|
|
|
// Remove the CAP_FCHMOD right, can no longer add seals.
|
|
EXPECT_OK(cap_rights_limit(memfd_rw, cap_rights_init(&rights, CAP_MMAP_RW)));
|
|
EXPECT_NOTCAPABLE(fcntl(memfd_rw, F_ADD_SEALS, F_SEAL_WRITE));
|
|
|
|
close(memfd);
|
|
close(memfd_ro);
|
|
close(memfd_rw);
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
void noop() {}
|
|
#endif
|