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-rw-r--r--src/shared/log.c1
-rw-r--r--src/shared/memfd.c229
-rw-r--r--src/shared/memfd.h41
-rw-r--r--src/shared/missing.h44
4 files changed, 314 insertions, 1 deletions
diff --git a/src/shared/log.c b/src/shared/log.c
index b730ac921a..26c604afd8 100644
--- a/src/shared/log.c
+++ b/src/shared/log.c
@@ -908,7 +908,6 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
}
void log_parse_environment(void) {
- _cleanup_free_ char *line = NULL;
const char *e;
parse_proc_cmdline(parse_proc_cmdline_item);
diff --git a/src/shared/memfd.c b/src/shared/memfd.c
new file mode 100644
index 0000000000..2b0d26d9ed
--- /dev/null
+++ b/src/shared/memfd.c
@@ -0,0 +1,229 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+
+#include "util.h"
+#include "bus-label.h"
+#include "missing.h"
+#include "memfd.h"
+
+#include "sd-bus.h"
+
+int memfd_new(int *fd, const char *name) {
+
+ _cleanup_free_ char *g = NULL;
+ int n;
+
+ assert_return(fd, -EINVAL);
+
+ if (name) {
+ /* The kernel side is pretty picky about the character
+ * set here, let's do the usual bus escaping to deal
+ * with that. */
+
+ g = bus_label_escape(name);
+ if (!g)
+ return -ENOMEM;
+
+ name = g;
+
+ } else {
+ char pr[17] = {};
+
+ /* If no name is specified we generate one. We include
+ * a hint indicating our library implementation, and
+ * add the thread name to it */
+
+ assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
+
+ if (isempty(pr))
+ name = "sd";
+ else {
+ _cleanup_free_ char *e = NULL;
+
+ e = bus_label_escape(pr);
+ if (!e)
+ return -ENOMEM;
+
+ g = strappend("sd-", e);
+ if (!g)
+ return -ENOMEM;
+
+ name = g;
+ }
+ }
+
+ n = memfd_create(name, MFD_ALLOW_SEALING);
+ if (n < 0)
+ return -errno;
+
+ *fd = n;
+ return 0;
+}
+
+int memfd_map(int fd, uint64_t offset, size_t size, void **p) {
+ void *q;
+ int sealed;
+
+ assert_return(fd >= 0, -EINVAL);
+ assert_return(size > 0, -EINVAL);
+ assert_return(p, -EINVAL);
+
+ sealed = memfd_get_sealed(fd);
+ if (sealed < 0)
+ return sealed;
+
+ if (sealed)
+ q = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, offset);
+ else
+ q = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
+
+ if (q == MAP_FAILED)
+ return -errno;
+
+ *p = q;
+ return 0;
+}
+
+int memfd_set_sealed(int fd) {
+ int r;
+
+ assert_return(fd >= 0, -EINVAL);
+
+ r = fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
+ if (r < 0)
+ return -errno;
+
+ return 0;
+}
+
+int memfd_get_sealed(int fd) {
+ int r;
+
+ assert_return(fd >= 0, -EINVAL);
+
+ r = fcntl(fd, F_GET_SEALS);
+ if (r < 0)
+ return -errno;
+
+ return (r & (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE)) ==
+ (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
+}
+
+int memfd_get_size(int fd, uint64_t *sz) {
+ int r;
+ struct stat stat;
+
+ assert_return(fd >= 0, -EINVAL);
+ assert_return(sz, -EINVAL);
+
+ r = fstat(fd, &stat);
+ if (r < 0)
+ return -errno;
+
+ *sz = stat.st_size;
+ return r;
+}
+
+int memfd_set_size(int fd, uint64_t sz) {
+ int r;
+
+ assert_return(fd >= 0, -EINVAL);
+
+ r = ftruncate(fd, sz);
+ if (r < 0)
+ return -errno;
+
+ return r;
+}
+
+int memfd_new_and_map(int *fd, const char *name, size_t sz, void **p) {
+ _cleanup_close_ int n = -1;
+ int r;
+
+ r = memfd_new(&n, name);
+ if (r < 0)
+ return r;
+
+ r = memfd_set_size(n, sz);
+ if (r < 0)
+ return r;
+
+ r = memfd_map(n, 0, sz, p);
+ if (r < 0)
+ return r;
+
+ *fd = n;
+ n = -1;
+ return 0;
+}
+
+int memfd_get_name(int fd, char **name) {
+ char path[sizeof("/proc/self/fd/") + DECIMAL_STR_MAX(int)], buf[FILENAME_MAX+1], *e;
+ const char *delim, *end;
+ _cleanup_free_ char *n = NULL;
+ ssize_t k;
+
+ assert_return(fd >= 0, -EINVAL);
+ assert_return(name, -EINVAL);
+
+ sprintf(path, "/proc/self/fd/%i", fd);
+
+ k = readlink(path, buf, sizeof(buf));
+ if (k < 0)
+ return -errno;
+
+ if ((size_t) k >= sizeof(buf))
+ return -E2BIG;
+
+ buf[k] = 0;
+
+ delim = strstr(buf, ":[");
+ if (!delim)
+ return -EIO;
+
+ delim = strchr(delim + 2, ':');
+ if (!delim)
+ return -EIO;
+
+ delim++;
+
+ end = strchr(delim, ']');
+ if (!end)
+ return -EIO;
+
+ n = strndup(delim, end - delim);
+ if (!n)
+ return -ENOMEM;
+
+ e = bus_label_unescape(n);
+ if (!e)
+ return -ENOMEM;
+
+ *name = e;
+
+ return 0;
+}
diff --git a/src/shared/memfd.h b/src/shared/memfd.h
new file mode 100644
index 0000000000..02cb3978fa
--- /dev/null
+++ b/src/shared/memfd.h
@@ -0,0 +1,41 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <inttypes.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include "macro.h"
+#include "util.h"
+
+int memfd_new(int *fd, const char *name);
+int memfd_new_and_map(int *fd, const char *name, size_t sz, void **p);
+
+int memfd_map(int fd, uint64_t offset, size_t size, void **p);
+
+int memfd_set_sealed(int fd);
+int memfd_get_sealed(int fd);
+
+int memfd_get_size(int fd, uint64_t *sz);
+int memfd_set_size(int fd, uint64_t sz);
+
+int memfd_get_name(int fd, char **name);
diff --git a/src/shared/missing.h b/src/shared/missing.h
index 195edfc672..3ff1a21720 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -64,6 +64,34 @@
#define F_GETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 8)
#endif
+#ifndef F_ADD_SEALS
+#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
+#endif
+
+#ifndef F_GET_SEALS
+#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
+#endif
+
+#ifndef F_SEAL_SEAL
+#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
+#endif
+
+#ifndef F_SEAL_SHRINK
+#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
+#endif
+
+#ifndef F_SEAL_GROW
+#define F_SEAL_GROW 0x0004 /* prevent file from growing */
+#endif
+
+#ifndef F_SEAL_WRITE
+#define F_SEAL_WRITE 0x0008 /* prevent writes */
+#endif
+
+#ifndef MFD_ALLOW_SEALING
+#define MFD_ALLOW_SEALING 0x0002ULL
+#endif
+
#ifndef IP_FREEBIND
#define IP_FREEBIND 15
#endif
@@ -109,6 +137,13 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
# ifndef __NR_fanotify_mark
# define __NR_fanotify_mark 301
# endif
+# ifndef __NR_memfd_create
+# define __NR_memfd_create 319
+# endif
+#elif defined __arm__
+# ifndef __NR_memfd_create
+# define __NR_memfd_create 385
+# endif
#elif defined _MIPS_SIM
# if _MIPS_SIM == _MIPS_SIM_ABI32
# ifndef __NR_fanotify_init
@@ -139,6 +174,9 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
# ifndef __NR_fanotify_mark
# define __NR_fanotify_mark 339
# endif
+# ifndef __NR_memfd_create
+# define __NR_memfd_create 356
+# endif
#endif
#ifndef HAVE_FANOTIFY_INIT
@@ -166,6 +204,12 @@ static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t ma
}
#endif
+#ifndef HAVE_MEMFD_CREATE
+static inline int memfd_create(const char *name, uint64_t flags) {
+ return syscall(__NR_memfd_create, name, flags);
+}
+#endif
+
#ifndef BTRFS_IOCTL_MAGIC
#define BTRFS_IOCTL_MAGIC 0x94
#endif
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-01-08 22:33:30 +0000