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Userland: Add LibSystem and funnel all syscalls through it

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This achieves two things:

- Programs can now intentionally perform arbitrary syscalls by calling
  syscall(). This allows us to work on things like syscall fuzzing.

- It restricts the ability of userspace to make syscalls to a single
  4KB page of code. In order to call the kernel directly, an attacker
  must now locate this page and call through it.
This commit is contained in:
Andreas Kling 2021-02-05 12:16:30 +01:00
parent 4df3a34bc2
commit e87eac9273
47 changed files with 164 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Userland/Libraries/LibC/CMakeLists.txt
View file

@ -81,10 +81,10 @@ add_custom_command(
set(SOURCES ${LIBC_SOURCES} ${AK_SOURCES} ${ELF_SOURCES})
serenity_libc_static(LibCStatic c)
target_link_libraries(LibCStatic crt0 ssp)
add_dependencies(LibCStatic LibM)
target_link_libraries(LibCStatic crt0 ssp system)
add_dependencies(LibCStatic LibM LibSystem)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libstdc++")
serenity_libc(LibC c)
target_link_libraries(LibC crt0 ssp)
add_dependencies(LibC LibM)
target_link_libraries(LibC crt0 ssp system)
add_dependencies(LibC LibM LibSystem)

2
Userland/Libraries/LibC/assert.cpp
View file

@ -24,12 +24,12 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/internals.h>
#include <syscall.h>
#include <unistd.h>
extern "C" {

2
Userland/Libraries/LibC/dirent.cpp
View file

@ -26,7 +26,6 @@
#include <AK/Assertions.h>
#include <AK/StdLibExtras.h>
#include <Kernel/API/Syscall.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
@ -34,6 +33,7 @@
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <syscall.h>
#include <unistd.h>
extern "C" {

2
Userland/Libraries/LibC/fcntl.cpp
View file

@ -24,11 +24,11 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/ioctl.cpp
View file

@ -24,11 +24,11 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/mman.cpp
View file

@ -24,11 +24,11 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <mman.h>
#include <stdio.h>
#include <string.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/poll.cpp
View file

@ -24,10 +24,10 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <poll.h>
#include <sys/time.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/sched.cpp
View file

@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <sched.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/serenity.cpp
View file

@ -24,10 +24,10 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <serenity.h>
#include <string.h>
#include <syscall.h>
extern "C" {

4
Userland/Libraries/LibC/serenity.h
View file

@ -106,8 +106,8 @@ int anon_create(size_t size, int options);
int serenity_readlink(const char* path, size_t path_length, char* buffer, size_t buffer_size);
int getkeymap(char* name_buffer, size_t name_buffer_size, u32* map, u32* shift_map, u32* alt_map, u32* altgr_map, u32* shift_altgr_map);
int setkeymap(const char* name, const u32* map, u32* const shift_map, const u32* alt_map, const u32* altgr_map, const u32* shift_altgr_map);
int getkeymap(char* name_buffer, size_t name_buffer_size, uint32_t* map, uint32_t* shift_map, uint32_t* alt_map, uint32_t* altgr_map, uint32_t* shift_altgr_map);
int setkeymap(const char* name, const uint32_t* map, uint32_t* const shift_map, const uint32_t* alt_map, const uint32_t* altgr_map, const uint32_t* shift_altgr_map);
#ifdef __i386__
ALWAYS_INLINE void send_secret_data_to_userspace_emulator(uintptr_t data1, uintptr_t data2, uintptr_t data3)

2
Userland/Libraries/LibC/signal.cpp
View file

@ -25,12 +25,12 @@
*/
#include <AK/Format.h>
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <string.h>
#include <syscall.h>
#include <unistd.h>
extern "C" {

2
Userland/Libraries/LibC/stat.cpp
View file

@ -24,12 +24,12 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <syscall.h>
#include <unistd.h>
extern "C" {

2
Userland/Libraries/LibC/stdio.cpp
View file

@ -30,7 +30,6 @@
#include <AK/ScopedValueRollback.h>
#include <AK/StdLibExtras.h>
#include <AK/kmalloc.h>
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
@ -41,6 +40,7 @@
#include <sys/internals.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <syscall.h>
#include <unistd.h>
struct FILE {

2
Userland/Libraries/LibC/stdlib.cpp
View file

@ -30,7 +30,6 @@
#include <AK/StdLibExtras.h>
#include <AK/Types.h>
#include <AK/Utf8View.h>
#include <Kernel/API/Syscall.h>
#include <LibELF/AuxiliaryVector.h>
#include <alloca.h>
#include <assert.h>
@ -45,6 +44,7 @@
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <syscall.h>
#include <unistd.h>
static void strtons(const char* str, char** endptr)

2
Userland/Libraries/LibC/sys/prctl.cpp
View file

@ -24,11 +24,11 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/sys/ptrace.cpp
View file

@ -25,9 +25,9 @@
*/
#include <AK/LogStream.h>
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <sys/ptrace.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/sys/select.cpp
View file

@ -24,11 +24,11 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <stdio.h>
#include <sys/select.h>
#include <sys/time.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/sys/socket.cpp
View file

@ -25,12 +25,12 @@
*/
#include <AK/Assertions.h>
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/sys/uio.cpp
View file

@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <sys/uio.h>
#include <syscall.h>
extern "C" {

2
Userland/Libraries/LibC/sys/wait.cpp
View file

@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <sys/wait.h>
#include <syscall.h>
#include <unistd.h>
extern "C" {

1
Userland/Libraries/LibC/termios.cpp
View file

@ -24,7 +24,6 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <errno.h>
#include <sys/ioctl.h>

2
Userland/Libraries/LibC/time.cpp
View file

@ -27,13 +27,13 @@
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Time.h>
#include <Kernel/API/Syscall.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/times.h>
#include <syscall.h>
#include <time.h>
extern "C" {

2
Userland/Libraries/LibC/times.cpp
View file

@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <sys/times.h>
#include <syscall.h>
clock_t times(struct tms* buf)
{

2
Userland/Libraries/LibC/unistd.cpp
View file

@ -27,7 +27,6 @@
#include <AK/ScopedValueRollback.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <Kernel/API/Syscall.h>
#include <alloca.h>
#include <assert.h>
#include <errno.h>
@ -42,6 +41,7 @@
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <syscall.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>

2
Userland/Libraries/LibC/utime.cpp
View file

@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <string.h>
#include <syscall.h>
#include <utime.h>
extern "C" {

2
Userland/Libraries/LibC/utsname.cpp
View file

@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <sys/utsname.h>
#include <syscall.h>
extern "C" {