| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| #pragma once |
| |
| /* Missing glibc definitions to access certain kernel APIs */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #if HAVE_LINUX_TIME_TYPES_H |
| /* This header defines __kernel_timespec for us, but is only available since Linux 5.1, hence conditionally |
| * include this. */ |
| #include <linux/time_types.h> |
| #endif |
| #include <signal.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #ifdef ARCH_MIPS |
| #include <asm/sgidefs.h> |
| #endif |
| |
| #include "missing_keyctl.h" |
| #include "missing_stat.h" |
| #include "missing_syscall_def.h" |
| |
| /* linux/kcmp.h */ |
| #ifndef KCMP_FILE /* 3f4994cfc15f38a3159c6e3a4b3ab2e1481a6b02 (3.19) */ |
| #define KCMP_FILE 0 |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_PIVOT_ROOT |
| static inline int missing_pivot_root(const char *new_root, const char *put_old) { |
| return syscall(__NR_pivot_root, new_root, put_old); |
| } |
| |
| # define pivot_root missing_pivot_root |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_MEMFD_CREATE |
| static inline int missing_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 |
| } |
| |
| # define memfd_create missing_memfd_create |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_GETRANDOM |
| /* glibc says getrandom() returns ssize_t */ |
| static inline ssize_t missing_getrandom(void *buffer, size_t count, unsigned flags) { |
| # ifdef __NR_getrandom |
| return syscall(__NR_getrandom, buffer, count, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define getrandom missing_getrandom |
| #endif |
| |
| /* ======================================================================= */ |
| |
| /* The syscall has been defined since forever, but the glibc wrapper was missing. */ |
| #if !HAVE_GETTID |
| static inline pid_t missing_gettid(void) { |
| # if defined __NR_gettid && __NR_gettid >= 0 |
| return (pid_t) syscall(__NR_gettid); |
| # else |
| # error "__NR_gettid not defined" |
| # endif |
| } |
| |
| # define gettid missing_gettid |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_NAME_TO_HANDLE_AT |
| /* may be (invalid) negative number due to libseccomp, see PR 13319 */ |
| # if ! (defined __NR_name_to_handle_at && __NR_name_to_handle_at >= 0) |
| # if defined __NR_name_to_handle_at |
| # undef __NR_name_to_handle_at |
| # endif |
| # if defined(__x86_64__) |
| # define __NR_name_to_handle_at 303 |
| # elif defined(__i386__) |
| # define __NR_name_to_handle_at 341 |
| # elif defined(__arm__) |
| # define __NR_name_to_handle_at 370 |
| # elif defined(__powerpc__) |
| # define __NR_name_to_handle_at 345 |
| # elif defined(__arc__) |
| # define __NR_name_to_handle_at 264 |
| # else |
| # error "__NR_name_to_handle_at is not defined" |
| # endif |
| # endif |
| |
| #ifndef GOOGLE3_BLAZE_BUILD |
| struct file_handle { |
| unsigned int handle_bytes; |
| int handle_type; |
| unsigned char f_handle[0]; |
| }; |
| #endif // GOOGLE3_BLAZE_BUILD |
| |
| static inline int missing_name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) { |
| # ifdef __NR_name_to_handle_at |
| return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define name_to_handle_at missing_name_to_handle_at |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_SETNS |
| static inline int missing_setns(int fd, int nstype) { |
| # ifdef __NR_setns |
| return syscall(__NR_setns, fd, nstype); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define setns missing_setns |
| #endif |
| |
| /* ======================================================================= */ |
| |
| static inline pid_t raw_getpid(void) { |
| #if defined(__alpha__) |
| return (pid_t) syscall(__NR_getxpid); |
| #else |
| return (pid_t) syscall(__NR_getpid); |
| #endif |
| } |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_RENAMEAT2 |
| static inline int missing_renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) { |
| # ifdef __NR_renameat2 |
| return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define renameat2 missing_renameat2 |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_KCMP |
| static inline int missing_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) { |
| # if defined __NR_kcmp && __NR_kcmp >= 0 |
| return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define kcmp missing_kcmp |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_KEYCTL |
| static inline long missing_keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) { |
| # if defined __NR_keyctl && __NR_keyctl >= 0 |
| return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| |
| # define keyctl missing_keyctl |
| } |
| |
| static inline key_serial_t missing_add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) { |
| # if defined __NR_add_key && __NR_add_key >= 0 |
| return syscall(__NR_add_key, type, description, payload, plen, ringid); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| |
| # define add_key missing_add_key |
| } |
| |
| static inline key_serial_t missing_request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) { |
| # if defined __NR_request_key && __NR_request_key >= 0 |
| return syscall(__NR_request_key, type, description, callout_info, destringid); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| |
| # define request_key missing_request_key |
| } |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_COPY_FILE_RANGE |
| static inline ssize_t missing_copy_file_range(int fd_in, loff_t *off_in, |
| int fd_out, loff_t *off_out, |
| size_t len, |
| unsigned int flags) { |
| # ifdef __NR_copy_file_range |
| return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define copy_file_range missing_copy_file_range |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_BPF |
| union bpf_attr; |
| |
| static inline int missing_bpf(int cmd, union bpf_attr *attr, size_t size) { |
| #ifdef __NR_bpf |
| return (int) syscall(__NR_bpf, cmd, attr, size); |
| #else |
| errno = ENOSYS; |
| return -1; |
| #endif |
| } |
| |
| # define bpf missing_bpf |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_STATX |
| struct statx; |
| |
| static inline ssize_t missing_statx(int dfd, const char *filename, unsigned flags, unsigned int mask, struct statx *buffer) { |
| # ifdef __NR_statx |
| return syscall(__NR_statx, dfd, filename, flags, mask, buffer); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| #endif |
| |
| /* This typedef is supposed to be always defined. */ |
| typedef struct statx struct_statx; |
| |
| #if !HAVE_STATX |
| # define statx(dfd, filename, flags, mask, buffer) missing_statx(dfd, filename, flags, mask, buffer) |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_SET_MEMPOLICY |
| enum { |
| MPOL_DEFAULT, |
| MPOL_PREFERRED, |
| MPOL_BIND, |
| MPOL_INTERLEAVE, |
| MPOL_LOCAL, |
| }; |
| |
| static inline long missing_set_mempolicy(int mode, const unsigned long *nodemask, |
| unsigned long maxnode) { |
| long i; |
| # if defined __NR_set_mempolicy && __NR_set_mempolicy >= 0 |
| i = syscall(__NR_set_mempolicy, mode, nodemask, maxnode); |
| # else |
| errno = ENOSYS; |
| i = -1; |
| # endif |
| return i; |
| } |
| |
| # define set_mempolicy missing_set_mempolicy |
| #endif |
| |
| #if !HAVE_GET_MEMPOLICY |
| static inline long missing_get_mempolicy(int *mode, unsigned long *nodemask, |
| unsigned long maxnode, void *addr, |
| unsigned long flags) { |
| long i; |
| # if defined __NR_get_mempolicy && __NR_get_mempolicy >= 0 |
| i = syscall(__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags); |
| # else |
| errno = ENOSYS; |
| i = -1; |
| # endif |
| return i; |
| } |
| |
| # define get_mempolicy missing_get_mempolicy |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_PIDFD_SEND_SIGNAL |
| static inline int missing_pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) { |
| # ifdef __NR_pidfd_send_signal |
| return syscall(__NR_pidfd_send_signal, fd, sig, info, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define pidfd_send_signal missing_pidfd_send_signal |
| #endif |
| |
| #if !HAVE_PIDFD_OPEN |
| static inline int missing_pidfd_open(pid_t pid, unsigned flags) { |
| # ifdef __NR_pidfd_open |
| return syscall(__NR_pidfd_open, pid, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define pidfd_open missing_pidfd_open |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_RT_SIGQUEUEINFO |
| static inline int missing_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info) { |
| # if defined __NR_rt_sigqueueinfo && __NR_rt_sigqueueinfo >= 0 |
| return syscall(__NR_rt_sigqueueinfo, tgid, sig, info); |
| # else |
| # error "__NR_rt_sigqueueinfo not defined" |
| # endif |
| } |
| |
| # define rt_sigqueueinfo missing_rt_sigqueueinfo |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_EXECVEAT |
| static inline int missing_execveat(int dirfd, const char *pathname, |
| char *const argv[], char *const envp[], |
| int flags) { |
| # if defined __NR_execveat && __NR_execveat >= 0 |
| return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # undef AT_EMPTY_PATH |
| # define AT_EMPTY_PATH 0x1000 |
| # define execveat missing_execveat |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_CLOSE_RANGE |
| static inline int missing_close_range(int first_fd, int end_fd, unsigned flags) { |
| # ifdef __NR_close_range |
| /* Kernel-side the syscall expects fds as unsigned integers (just like close() actually), while |
| * userspace exclusively uses signed integers for fds. We don't know just yet how glibc is going to |
| * wrap this syscall, but let's assume it's going to be similar to what they do for close(), |
| * i.e. make the same unsigned → signed type change from the raw kernel syscall compared to the |
| * userspace wrapper. There's only one caveat for this: unlike for close() there's the special |
| * UINT_MAX fd value for the 'end_fd' argument. Let's safely map that to -1 here. And let's refuse |
| * any other negative values. */ |
| if ((first_fd < 0) || (end_fd < 0 && end_fd != -1)) { |
| errno = -EBADF; |
| return -1; |
| } |
| |
| return syscall(__NR_close_range, |
| (unsigned) first_fd, |
| end_fd == -1 ? UINT_MAX : (unsigned) end_fd, /* Of course, the compiler should figure out that this is the identity mapping IRL */ |
| flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define close_range missing_close_range |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_EPOLL_PWAIT2 |
| |
| /* Defined to be equivalent to the kernel's _NSIG_WORDS, i.e. the size of the array of longs that is |
| * encapsulated by sigset_t. */ |
| #define KERNEL_NSIG_WORDS (64 / (sizeof(long) * 8)) |
| #define KERNEL_NSIG_BYTES (KERNEL_NSIG_WORDS * sizeof(long)) |
| |
| struct epoll_event; |
| |
| static inline int missing_epoll_pwait2( |
| int fd, |
| struct epoll_event *events, |
| int maxevents, |
| const struct timespec *timeout, |
| const sigset_t *sigset) { |
| |
| # if defined(__NR_epoll_pwait2) && HAVE_LINUX_TIME_TYPES_H |
| if (timeout) { |
| /* Convert from userspace timespec to kernel timespec */ |
| struct __kernel_timespec ts = { |
| .tv_sec = timeout->tv_sec, |
| .tv_nsec = timeout->tv_nsec, |
| }; |
| |
| return syscall(__NR_epoll_pwait2, fd, events, maxevents, &ts, sigset, sigset ? KERNEL_NSIG_BYTES : 0); |
| } else |
| return syscall(__NR_epoll_pwait2, fd, events, maxevents, NULL, sigset, sigset ? KERNEL_NSIG_BYTES : 0); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define epoll_pwait2 missing_epoll_pwait2 |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_MOUNT_SETATTR |
| |
| #if !HAVE_STRUCT_MOUNT_ATTR |
| struct mount_attr { |
| uint64_t attr_set; |
| uint64_t attr_clr; |
| uint64_t propagation; |
| uint64_t userns_fd; |
| }; |
| #else |
| struct mount_attr; |
| #endif |
| |
| #ifndef MOUNT_ATTR_IDMAP |
| #define MOUNT_ATTR_IDMAP 0x00100000 |
| #endif |
| |
| #ifndef AT_RECURSIVE |
| #define AT_RECURSIVE 0x8000 |
| #endif |
| |
| static inline int missing_mount_setattr( |
| int dfd, |
| const char *path, |
| unsigned flags, |
| struct mount_attr *attr, |
| size_t size) { |
| |
| # if defined __NR_mount_setattr && __NR_mount_setattr >= 0 |
| return syscall(__NR_mount_setattr, dfd, path, flags, attr, size); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define mount_setattr missing_mount_setattr |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_OPEN_TREE |
| |
| #ifndef OPEN_TREE_CLONE |
| #define OPEN_TREE_CLONE 1 |
| #endif |
| |
| #ifndef OPEN_TREE_CLOEXEC |
| #define OPEN_TREE_CLOEXEC O_CLOEXEC |
| #endif |
| |
| static inline int missing_open_tree( |
| int dfd, |
| const char *filename, |
| unsigned flags) { |
| |
| # if defined __NR_open_tree && __NR_open_tree >= 0 |
| return syscall(__NR_open_tree, dfd, filename, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define open_tree missing_open_tree |
| #endif |
| |
| /* ======================================================================= */ |
| |
| #if !HAVE_MOVE_MOUNT |
| |
| #ifndef MOVE_MOUNT_F_EMPTY_PATH |
| #define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */ |
| #endif |
| |
| #ifndef MOVE_MOUNT_T_EMPTY_PATH |
| #define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */ |
| #endif |
| |
| static inline int missing_move_mount( |
| int from_dfd, |
| const char *from_pathname, |
| int to_dfd, |
| const char *to_pathname, |
| unsigned flags) { |
| |
| # if defined __NR_move_mount && __NR_move_mount >= 0 |
| return syscall(__NR_move_mount, from_dfd, from_pathname, to_dfd, to_pathname, flags); |
| # else |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| # define move_mount missing_move_mount |
| #endif |