11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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***/
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#include <sched.h>
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#include <sys/prctl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "btrfs-util.h"
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#include "capability-util.h"
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#include "fd-util.h"
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#include "import-common.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "util.h"
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int import_make_read_only_fd(int fd) {
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int r;
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assert(fd >= 0);
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/* First, let's make this a read-only subvolume if it refers
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* to a subvolume */
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r = btrfs_subvol_set_read_only_fd(fd, true);
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if (IN_SET(r, -ENOTTY, -ENOTDIR, -EINVAL)) {
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struct stat st;
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/* This doesn't refer to a subvolume, or the file
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* system isn't even btrfs. In that, case fall back to
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* chmod()ing */
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r = fstat(fd, &st);
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if (r < 0)
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return log_error_errno(errno, "Failed to stat temporary image: %m");
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/* Drop "w" flag */
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if (fchmod(fd, st.st_mode & 07555) < 0)
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return log_error_errno(errno, "Failed to chmod() final image: %m");
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return 0;
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} else if (r < 0)
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return log_error_errno(r, "Failed to make subvolume read-only: %m");
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return 0;
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}
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int import_make_read_only(const char *path) {
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_cleanup_close_ int fd = 1;
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fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return log_error_errno(errno, "Failed to open %s: %m", path);
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return import_make_read_only_fd(fd);
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}
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int import_fork_tar_x(const char *path, pid_t *ret) {
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_cleanup_close_pair_ int pipefd[2] = { -1, -1 };
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pid_t pid;
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int r;
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assert(path);
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assert(ret);
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if (pipe2(pipefd, O_CLOEXEC) < 0)
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return log_error_errno(errno, "Failed to create pipe for tar: %m");
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r = safe_fork("(tar)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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uint64_t retain =
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(1ULL << CAP_CHOWN) |
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(1ULL << CAP_FOWNER) |
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(1ULL << CAP_FSETID) |
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(1ULL << CAP_MKNOD) |
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(1ULL << CAP_SETFCAP) |
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(1ULL << CAP_DAC_OVERRIDE);
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/* Child */
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pipefd[1] = safe_close(pipefd[1]);
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r = rearrange_stdio(pipefd[0], -1, STDERR_FILENO);
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if (r < 0) {
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log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
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_exit(EXIT_FAILURE);
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}
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if (unshare(CLONE_NEWNET) < 0)
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log_error_errno(errno, "Failed to lock tar into network namespace, ignoring: %m");
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r = capability_bounding_set_drop(retain, true);
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if (r < 0)
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log_error_errno(r, "Failed to drop capabilities, ignoring: %m");
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execlp("tar", "tar", "--numeric-owner", "-C", path, "-px", "--xattrs", "--xattrs-include=*", NULL);
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log_error_errno(errno, "Failed to execute tar: %m");
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_exit(EXIT_FAILURE);
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}
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*ret = pid;
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return TAKE_FD(pipefd[1]);
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}
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int import_fork_tar_c(const char *path, pid_t *ret) {
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_cleanup_close_pair_ int pipefd[2] = { -1, -1 };
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pid_t pid;
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int r;
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assert(path);
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assert(ret);
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if (pipe2(pipefd, O_CLOEXEC) < 0)
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return log_error_errno(errno, "Failed to create pipe for tar: %m");
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r = safe_fork("(tar)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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uint64_t retain = (1ULL << CAP_DAC_OVERRIDE);
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/* Child */
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pipefd[0] = safe_close(pipefd[0]);
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r = rearrange_stdio(-1, pipefd[1], STDERR_FILENO);
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if (r < 0) {
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log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
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_exit(EXIT_FAILURE);
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}
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if (unshare(CLONE_NEWNET) < 0)
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log_error_errno(errno, "Failed to lock tar into network namespace, ignoring: %m");
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r = capability_bounding_set_drop(retain, true);
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if (r < 0)
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log_error_errno(r, "Failed to drop capabilities, ignoring: %m");
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execlp("tar", "tar", "-C", path, "-c", "--xattrs", "--xattrs-include=*", ".", NULL);
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log_error_errno(errno, "Failed to execute tar: %m");
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_exit(EXIT_FAILURE);
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}
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*ret = pid;
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return TAKE_FD(pipefd[0]);
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}
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