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Diffstat (limited to 'src/libsystemd/sd-bus/sd-memfd.c')
-rw-r--r--src/libsystemd/sd-bus/sd-memfd.c54
1 files changed, 20 insertions, 34 deletions
diff --git a/src/libsystemd/sd-bus/sd-memfd.c b/src/libsystemd/sd-bus/sd-memfd.c
index fcf3e73124..16d09e3e14 100644
--- a/src/libsystemd/sd-bus/sd-memfd.c
+++ b/src/libsystemd/sd-bus/sd-memfd.c
@@ -26,8 +26,8 @@
#include <sys/prctl.h>
#include "util.h"
-#include "kdbus.h"
#include "bus-label.h"
+#include "missing.h"
#include "sd-memfd.h"
#include "sd-bus.h"
@@ -39,11 +39,8 @@ struct sd_memfd {
_public_ int sd_memfd_new(sd_memfd **m, const char *name) {
- struct kdbus_cmd_memfd_make *cmd;
- struct kdbus_item *item;
_cleanup_close_ int kdbus = -1;
_cleanup_free_ char *g = NULL;
- size_t sz, l;
sd_memfd *n;
assert_return(m, -EINVAL);
@@ -89,42 +86,28 @@ _public_ int sd_memfd_new(sd_memfd **m, const char *name) {
}
}
- l = strlen(name);
- sz = ALIGN8(offsetof(struct kdbus_cmd_memfd_make, items)) +
- ALIGN8(offsetof(struct kdbus_item, str)) +
- l + 1;
-
- cmd = alloca0(sz);
- cmd->size = sz;
-
- item = cmd->items;
- item->size = ALIGN8(offsetof(struct kdbus_item, str)) + l + 1;
- item->type = KDBUS_ITEM_MEMFD_NAME;
- memcpy(item->str, name, l + 1);
-
- if (ioctl(kdbus, KDBUS_CMD_MEMFD_NEW, cmd) < 0)
- return -errno;
-
n = new0(struct sd_memfd, 1);
- if (!n) {
- safe_close(cmd->fd);
+ if (!n)
return -ENOMEM;
+
+ n->fd = memfd_create(name, 0, MFD_ALLOW_SEALING);
+ if (n->fd < 0) {
+ free(n);
+ return -errno;
}
- n->fd = cmd->fd;
*m = n;
return 0;
}
_public_ int sd_memfd_new_from_fd(sd_memfd **m, int fd) {
sd_memfd *n;
- uint64_t sz;
assert_return(m, -EINVAL);
assert_return(fd >= 0, -EINVAL);
- /* Check if this is a valid memfd */
- if (ioctl(fd, KDBUS_CMD_MEMFD_SIZE_GET, &sz) < 0)
+ /* Check if this is a sealable fd */
+ if (fcntl(fd, F_GET_SEALS) < 0)
return -ENOTTY;
n = new0(struct sd_memfd, 1);
@@ -193,7 +176,7 @@ _public_ int sd_memfd_map(sd_memfd *m, uint64_t offset, size_t size, void **p) {
if (sealed < 0)
return sealed;
- q = mmap(NULL, size, sealed ? PROT_READ : PROT_READ|PROT_WRITE, MAP_SHARED, m->fd, offset);
+ q = mmap(NULL, size, sealed ? PROT_READ : PROT_READ|PROT_WRITE, MAP_PRIVATE, m->fd, offset);
if (q == MAP_FAILED)
return -errno;
@@ -201,12 +184,12 @@ _public_ int sd_memfd_map(sd_memfd *m, uint64_t offset, size_t size, void **p) {
return 0;
}
-_public_ int sd_memfd_set_sealed(sd_memfd *m, int b) {
+_public_ int sd_memfd_set_sealed(sd_memfd *m) {
int r;
assert_return(m, -EINVAL);
- r = ioctl(m->fd, KDBUS_CMD_MEMFD_SEAL_SET, b);
+ r = fcntl(m->fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
if (r < 0)
return -errno;
@@ -214,27 +197,30 @@ _public_ int sd_memfd_set_sealed(sd_memfd *m, int b) {
}
_public_ int sd_memfd_get_sealed(sd_memfd *m) {
- int r, b;
+ int r;
assert_return(m, -EINVAL);
- r = ioctl(m->fd, KDBUS_CMD_MEMFD_SEAL_GET, &b);
+ r = fcntl(m->fd, F_GET_SEALS);
if (r < 0)
return -errno;
- return !!b;
+ return (r & (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE)) ==
+ (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
}
_public_ int sd_memfd_get_size(sd_memfd *m, uint64_t *sz) {
int r;
+ struct stat stat;
assert_return(m, -EINVAL);
assert_return(sz, -EINVAL);
- r = ioctl(m->fd, KDBUS_CMD_MEMFD_SIZE_GET, sz);
+ r = fstat(m->fd, &stat);
if (r < 0)
return -errno;
+ *sz = stat.st_size;
return r;
}
@@ -243,7 +229,7 @@ _public_ int sd_memfd_set_size(sd_memfd *m, uint64_t sz) {
assert_return(m, -EINVAL);
- r = ioctl(m->fd, KDBUS_CMD_MEMFD_SIZE_SET, &sz);
+ r = ftruncate(m->fd, sz);
if (r < 0)
return -errno;