Luca Boccassi
7c83d42ef8
Instead of mounting over, do an atomic swap using mount beneath, if available. This way assets can be mounted again and again (e.g.: updates) without leaking mounts.
675 lines
18 KiB
C
675 lines
18 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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/* Missing glibc definitions to access certain kernel APIs */
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#include <errno.h>
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#include <fcntl.h>
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#if HAVE_LINUX_TIME_TYPES_H
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/* This header defines __kernel_timespec for us, but is only available since Linux 5.1, hence conditionally
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* include this. */
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#include <linux/time_types.h>
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#endif
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#include <signal.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#ifdef ARCH_MIPS
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#include <asm/sgidefs.h>
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#endif
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#include "macro.h"
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#include "missing_keyctl.h"
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#include "missing_stat.h"
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#include "missing_syscall_def.h"
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/* linux/kcmp.h */
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#ifndef KCMP_FILE /* 3f4994cfc15f38a3159c6e3a4b3ab2e1481a6b02 (3.19) */
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#define KCMP_FILE 0
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#endif
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/* ======================================================================= */
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#if !HAVE_PIVOT_ROOT
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static inline int missing_pivot_root(const char *new_root, const char *put_old) {
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return syscall(__NR_pivot_root, new_root, put_old);
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}
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# define pivot_root missing_pivot_root
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#endif
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/* ======================================================================= */
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#if !HAVE_IOPRIO_GET
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static inline int missing_ioprio_get(int which, int who) {
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return syscall(__NR_ioprio_get, which, who);
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}
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# define ioprio_get missing_ioprio_get
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#endif
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/* ======================================================================= */
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#if !HAVE_IOPRIO_SET
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static inline int missing_ioprio_set(int which, int who, int ioprio) {
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return syscall(__NR_ioprio_set, which, who, ioprio);
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}
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# define ioprio_set missing_ioprio_set
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#endif
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/* ======================================================================= */
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#if !HAVE_MEMFD_CREATE
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static inline int missing_memfd_create(const char *name, unsigned int flags) {
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# ifdef __NR_memfd_create
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return syscall(__NR_memfd_create, name, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define memfd_create missing_memfd_create
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#endif
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/* ======================================================================= */
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#if !HAVE_GETRANDOM
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/* glibc says getrandom() returns ssize_t */
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static inline ssize_t missing_getrandom(void *buffer, size_t count, unsigned flags) {
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# ifdef __NR_getrandom
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return syscall(__NR_getrandom, buffer, count, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define getrandom missing_getrandom
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#endif
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/* ======================================================================= */
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/* The syscall has been defined since forever, but the glibc wrapper was missing. */
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#if !HAVE_GETTID
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static inline pid_t missing_gettid(void) {
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# if defined __NR_gettid && __NR_gettid >= 0
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return (pid_t) syscall(__NR_gettid);
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# else
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# error "__NR_gettid not defined"
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# endif
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}
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# define gettid missing_gettid
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#endif
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/* ======================================================================= */
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#if !HAVE_NAME_TO_HANDLE_AT
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struct file_handle {
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unsigned int handle_bytes;
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int handle_type;
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unsigned char f_handle[0];
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};
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static inline int missing_name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
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# ifdef __NR_name_to_handle_at
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return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define name_to_handle_at missing_name_to_handle_at
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#endif
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/* ======================================================================= */
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#if !HAVE_SETNS
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static inline int missing_setns(int fd, int nstype) {
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# ifdef __NR_setns
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return syscall(__NR_setns, fd, nstype);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define setns missing_setns
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#endif
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/* ======================================================================= */
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static inline pid_t raw_getpid(void) {
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#if defined(__alpha__)
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return (pid_t) syscall(__NR_getxpid);
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#else
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return (pid_t) syscall(__NR_getpid);
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#endif
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}
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/* ======================================================================= */
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#if !HAVE_RENAMEAT2
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static inline int missing_renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
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# ifdef __NR_renameat2
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return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define renameat2 missing_renameat2
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#endif
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/* ======================================================================= */
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#if !HAVE_KCMP
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static inline int missing_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
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# if defined __NR_kcmp && __NR_kcmp >= 0
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return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define kcmp missing_kcmp
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#endif
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/* ======================================================================= */
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#if !HAVE_KEYCTL
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static inline long missing_keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) {
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# if defined __NR_keyctl && __NR_keyctl >= 0
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return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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# define keyctl missing_keyctl
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}
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static inline key_serial_t missing_add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) {
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# if defined __NR_add_key && __NR_add_key >= 0
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return syscall(__NR_add_key, type, description, payload, plen, ringid);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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# define add_key missing_add_key
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}
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static inline key_serial_t missing_request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) {
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# if defined __NR_request_key && __NR_request_key >= 0
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return syscall(__NR_request_key, type, description, callout_info, destringid);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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# define request_key missing_request_key
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}
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#endif
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/* ======================================================================= */
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#if !HAVE_COPY_FILE_RANGE
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static inline ssize_t missing_copy_file_range(int fd_in, loff_t *off_in,
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int fd_out, loff_t *off_out,
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size_t len,
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unsigned int flags) {
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# ifdef __NR_copy_file_range
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return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define copy_file_range missing_copy_file_range
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#endif
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/* ======================================================================= */
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#if !HAVE_BPF
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union bpf_attr;
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static inline int missing_bpf(int cmd, union bpf_attr *attr, size_t size) {
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#ifdef __NR_bpf
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return (int) syscall(__NR_bpf, cmd, attr, size);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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# define bpf missing_bpf
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#endif
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/* ======================================================================= */
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#if !HAVE_STATX
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struct statx;
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static inline ssize_t missing_statx(int dfd, const char *filename, unsigned flags, unsigned int mask, struct statx *buffer) {
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# ifdef __NR_statx
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return syscall(__NR_statx, dfd, filename, flags, mask, buffer);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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#endif
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/* This typedef is supposed to be always defined. */
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typedef struct statx struct_statx;
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#if !HAVE_STATX
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# define statx(dfd, filename, flags, mask, buffer) missing_statx(dfd, filename, flags, mask, buffer)
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#endif
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/* ======================================================================= */
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#if !HAVE_SET_MEMPOLICY
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enum {
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MPOL_DEFAULT,
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MPOL_PREFERRED,
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MPOL_BIND,
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MPOL_INTERLEAVE,
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MPOL_LOCAL,
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};
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static inline long missing_set_mempolicy(int mode, const unsigned long *nodemask,
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unsigned long maxnode) {
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long i;
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# if defined __NR_set_mempolicy && __NR_set_mempolicy >= 0
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i = syscall(__NR_set_mempolicy, mode, nodemask, maxnode);
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# else
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errno = ENOSYS;
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i = -1;
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# endif
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return i;
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}
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# define set_mempolicy missing_set_mempolicy
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#endif
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#if !HAVE_GET_MEMPOLICY
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static inline long missing_get_mempolicy(int *mode, unsigned long *nodemask,
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unsigned long maxnode, void *addr,
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unsigned long flags) {
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long i;
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# if defined __NR_get_mempolicy && __NR_get_mempolicy >= 0
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i = syscall(__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags);
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# else
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errno = ENOSYS;
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i = -1;
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# endif
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return i;
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}
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# define get_mempolicy missing_get_mempolicy
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#endif
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/* ======================================================================= */
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#if !HAVE_PIDFD_SEND_SIGNAL
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static inline int missing_pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) {
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# ifdef __NR_pidfd_send_signal
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return syscall(__NR_pidfd_send_signal, fd, sig, info, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define pidfd_send_signal missing_pidfd_send_signal
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#endif
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#if !HAVE_PIDFD_OPEN
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static inline int missing_pidfd_open(pid_t pid, unsigned flags) {
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# ifdef __NR_pidfd_open
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return syscall(__NR_pidfd_open, pid, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define pidfd_open missing_pidfd_open
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#endif
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/* ======================================================================= */
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#if !HAVE_RT_SIGQUEUEINFO
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static inline int missing_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info) {
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# if defined __NR_rt_sigqueueinfo && __NR_rt_sigqueueinfo >= 0
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return syscall(__NR_rt_sigqueueinfo, tgid, sig, info);
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# else
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# error "__NR_rt_sigqueueinfo not defined"
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# endif
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}
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# define rt_sigqueueinfo missing_rt_sigqueueinfo
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#endif
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/* ======================================================================= */
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#if !HAVE_RT_TGSIGQUEUEINFO
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static inline int missing_rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *info) {
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# if defined __NR_rt_tgsigqueueinfo && __NR_rt_tgsigqueueinfo >= 0
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return syscall(__NR_rt_tgsigqueueinfo, tgid, tid, sig, info);
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# else
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# error "__NR_rt_tgsigqueueinfo not defined"
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# endif
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}
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# define rt_tgsigqueueinfo missing_rt_tgsigqueueinfo
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#endif
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/* ======================================================================= */
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#if !HAVE_EXECVEAT
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static inline int missing_execveat(int dirfd, const char *pathname,
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char *const argv[], char *const envp[],
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int flags) {
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# if defined __NR_execveat && __NR_execveat >= 0
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return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# undef AT_EMPTY_PATH
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# define AT_EMPTY_PATH 0x1000
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# define execveat missing_execveat
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#endif
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/* ======================================================================= */
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#if !HAVE_CLOSE_RANGE
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static inline int missing_close_range(int first_fd, int end_fd, unsigned flags) {
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# ifdef __NR_close_range
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/* Kernel-side the syscall expects fds as unsigned integers (just like close() actually), while
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* userspace exclusively uses signed integers for fds. We don't know just yet how glibc is going to
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* wrap this syscall, but let's assume it's going to be similar to what they do for close(),
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* i.e. make the same unsigned → signed type change from the raw kernel syscall compared to the
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* userspace wrapper. There's only one caveat for this: unlike for close() there's the special
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* UINT_MAX fd value for the 'end_fd' argument. Let's safely map that to -1 here. And let's refuse
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* any other negative values. */
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if ((first_fd < 0) || (end_fd < 0 && end_fd != -1)) {
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errno = -EBADF;
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return -1;
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}
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return syscall(__NR_close_range,
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(unsigned) first_fd,
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end_fd == -1 ? UINT_MAX : (unsigned) end_fd, /* Of course, the compiler should figure out that this is the identity mapping IRL */
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flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define close_range missing_close_range
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#endif
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/* ======================================================================= */
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#if !HAVE_MOUNT_SETATTR
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#if !HAVE_STRUCT_MOUNT_ATTR
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struct mount_attr {
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uint64_t attr_set;
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uint64_t attr_clr;
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uint64_t propagation;
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uint64_t userns_fd;
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};
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#else
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struct mount_attr;
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#endif
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#ifndef MOUNT_ATTR_RDONLY
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#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
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#endif
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#ifndef MOUNT_ATTR_NOSUID
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#define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */
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#endif
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#ifndef MOUNT_ATTR_NODEV
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#define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */
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#endif
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#ifndef MOUNT_ATTR_NOEXEC
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#define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */
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#endif
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#ifndef MOUNT_ATTR__ATIME
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#define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */
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#endif
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#ifndef MOUNT_ATTR_RELATIME
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#define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */
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#endif
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#ifndef MOUNT_ATTR_NOATIME
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#define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */
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#endif
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#ifndef MOUNT_ATTR_STRICTATIME
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#define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */
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#endif
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#ifndef MOUNT_ATTR_NODIRATIME
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#define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */
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#endif
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#ifndef MOUNT_ATTR_IDMAP
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#define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
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#endif
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#ifndef MOUNT_ATTR_NOSYMFOLLOW
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#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */
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#endif
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#ifndef MOUNT_ATTR_SIZE_VER0
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#define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */
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#endif
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#ifndef AT_RECURSIVE
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#define AT_RECURSIVE 0x8000
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#endif
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static inline int missing_mount_setattr(
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int dfd,
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const char *path,
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unsigned flags,
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struct mount_attr *attr,
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size_t size) {
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# if defined __NR_mount_setattr && __NR_mount_setattr >= 0
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return syscall(__NR_mount_setattr, dfd, path, flags, attr, size);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define mount_setattr missing_mount_setattr
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#endif
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/* ======================================================================= */
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#if !HAVE_OPEN_TREE
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#ifndef OPEN_TREE_CLONE
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#define OPEN_TREE_CLONE 1
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#endif
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#ifndef OPEN_TREE_CLOEXEC
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#define OPEN_TREE_CLOEXEC O_CLOEXEC
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#endif
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static inline int missing_open_tree(
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int dfd,
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const char *filename,
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unsigned flags) {
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# if defined __NR_open_tree && __NR_open_tree >= 0
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return syscall(__NR_open_tree, dfd, filename, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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# define open_tree missing_open_tree
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#endif
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/* ======================================================================= */
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#ifndef MOVE_MOUNT_BENEATH
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#define MOVE_MOUNT_BENEATH 0x00000200
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#endif
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#if !HAVE_MOVE_MOUNT
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#ifndef MOVE_MOUNT_F_EMPTY_PATH
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|
#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
|