/* SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once /* Missing glibc definitions to access certain kernel APIs */ #include #include #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 #endif #include #include #include #include #include #ifdef ARCH_MIPS #include #endif #include "macro.h" #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_FCHMODAT2 static inline int missing_fchmodat2(int dirfd, const char *path, mode_t mode, int flags) { # ifdef __NR_fchmodat2 return syscall(__NR_fchmodat2, dirfd, path, mode, flags); # else errno = ENOSYS; return -1; # endif } # define fchmodat2 missing_fchmodat2 #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_IOPRIO_GET static inline int missing_ioprio_get(int which, int who) { return syscall(__NR_ioprio_get, which, who); } # define ioprio_get missing_ioprio_get #endif /* ======================================================================= */ #if !HAVE_IOPRIO_SET static inline int missing_ioprio_set(int which, int who, int ioprio) { return syscall(__NR_ioprio_set, which, who, ioprio); } # define ioprio_set missing_ioprio_set #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 struct file_handle { unsigned int handle_bytes; int handle_type; unsigned char f_handle[0]; }; 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_RT_TGSIGQUEUEINFO static inline int missing_rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *info) { # if defined __NR_rt_tgsigqueueinfo && __NR_rt_tgsigqueueinfo >= 0 return syscall(__NR_rt_tgsigqueueinfo, tgid, tid, sig, info); # else # error "__NR_rt_tgsigqueueinfo not defined" # endif } # define rt_tgsigqueueinfo missing_rt_tgsigqueueinfo #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_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_RDONLY #define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */ #endif #ifndef MOUNT_ATTR_NOSUID #define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */ #endif #ifndef MOUNT_ATTR_NODEV #define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */ #endif #ifndef MOUNT_ATTR_NOEXEC #define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */ #endif #ifndef MOUNT_ATTR__ATIME #define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */ #endif #ifndef MOUNT_ATTR_RELATIME #define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */ #endif #ifndef MOUNT_ATTR_NOATIME #define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */ #endif #ifndef MOUNT_ATTR_STRICTATIME #define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */ #endif #ifndef MOUNT_ATTR_NODIRATIME #define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */ #endif #ifndef MOUNT_ATTR_IDMAP #define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */ #endif #ifndef MOUNT_ATTR_NOSYMFOLLOW #define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */ #endif #ifndef MOUNT_ATTR_SIZE_VER0 #define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */ #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 /* ======================================================================= */ #ifndef MOVE_MOUNT_BENEATH #define MOVE_MOUNT_BENEATH 0x00000200 #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 /* ======================================================================= */ #if !HAVE_FSOPEN #ifndef FSOPEN_CLOEXEC #define FSOPEN_CLOEXEC 0x00000001 #endif static inline int missing_fsopen(const char *fsname, unsigned flags) { # if defined __NR_fsopen && __NR_fsopen >= 0 return syscall(__NR_fsopen, fsname, flags); # else errno = ENOSYS; return -1; # endif } # define fsopen missing_fsopen #endif /* ======================================================================= */ #if !HAVE_FSCONFIG #ifndef FSCONFIG_SET_FLAG #define FSCONFIG_SET_FLAG 0 /* Set parameter, supplying no value */ #endif #ifndef FSCONFIG_SET_STRING #define FSCONFIG_SET_STRING 1 /* Set parameter, supplying a string value */ #endif #ifndef FSCONFIG_SET_FD #define FSCONFIG_SET_FD 5 /* Set parameter, supplying an object by fd */ #endif #ifndef FSCONFIG_CMD_CREATE #define FSCONFIG_CMD_CREATE 6 /* Invoke superblock creation */ #endif static inline int missing_fsconfig(int fd, unsigned cmd, const char *key, const void *value, int aux) { # if defined __NR_fsconfig && __NR_fsconfig >= 0 return syscall(__NR_fsconfig, fd, cmd, key, value, aux); # else errno = ENOSYS; return -1; # endif } # define fsconfig missing_fsconfig #endif /* ======================================================================= */ #if !HAVE_FSMOUNT #ifndef FSMOUNT_CLOEXEC #define FSMOUNT_CLOEXEC 0x00000001 #endif static inline int missing_fsmount(int fd, unsigned flags, unsigned ms_flags) { # if defined __NR_fsmount && __NR_fsmount >= 0 return syscall(__NR_fsmount, fd, flags, ms_flags); # else errno = ENOSYS; return -1; # endif } # define fsmount missing_fsmount #endif /* ======================================================================= */ #if !HAVE_GETDENTS64 static inline ssize_t missing_getdents64(int fd, void *buffer, size_t length) { # if defined __NR_getdents64 && __NR_getdents64 >= 0 return syscall(__NR_getdents64, fd, buffer, length); # else errno = ENOSYS; return -1; # endif } # define getdents64 missing_getdents64 #endif /* ======================================================================= */ /* glibc does not provide clone() on ia64, only clone2(). Not only that, but it also doesn't provide a * prototype, only the symbol in the shared library (it provides a prototype for clone(), but not the * symbol in the shared library). */ #if defined(__ia64__) int __clone2(int (*fn)(void *), void *stack_base, size_t stack_size, int flags, void *arg); #define HAVE_CLONE 0 #else /* We know that everywhere else clone() is available, so we don't bother with a meson check (that takes time * at build time) and just define it. Once the kernel drops ia64 support, we can drop this too. */ #define HAVE_CLONE 1 #endif