mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-09 04:36:31 +00:00
273 lines
8.8 KiB
C
273 lines
8.8 KiB
C
/*
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* Minimal portability layer for system call differences between
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* Capsicum OSes.
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*/
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#ifndef __SYSCALLS_H__
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#define __SYSCALLS_H__
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/************************************************************
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* FreeBSD
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************************************************************/
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#ifdef __FreeBSD__
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/* Map umount2 (Linux) syscall to unmount (FreeBSD) syscall */
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#define umount2(T, F) unmount(T, F)
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/* Map sighandler_y (Linux) to sig_t (FreeBSD) */
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#define sighandler_t sig_t
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/* profil(2) has a first argument of char* */
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#define profil_arg1_t char
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/* FreeBSD has getdents(2) available */
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#include <sys/types.h>
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#include <dirent.h>
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inline int getdents_(unsigned int fd, void *dirp, unsigned int count) {
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return getdents(fd, (char*)dirp, count);
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}
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#include <sys/mman.h>
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inline int mincore_(void *addr, size_t length, unsigned char *vec) {
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return mincore(addr, length, (char*)vec);
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}
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#define getpid_ getpid
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/* Map Linux-style sendfile to FreeBSD sendfile */
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#include <sys/socket.h>
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#include <sys/uio.h>
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inline ssize_t sendfile_(int out_fd, int in_fd, off_t *offset, size_t count) {
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return sendfile(in_fd, out_fd, *offset, count, NULL, offset, 0);
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}
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/* A sample mount(2) call */
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#include <sys/param.h>
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#include <sys/mount.h>
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inline int bogus_mount_() {
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return mount("procfs", "/not_mounted", 0, NULL);
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}
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/* Mappings for extended attribute functions */
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#include <sys/extattr.h>
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#include <errno.h>
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static const char *fbsd_extattr_skip_prefix(const char *p) {
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if (*p++ == 'u' && *p++ == 's' && *p++ == 'e' && *p++ == 'r' && *p++ == '.')
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return p;
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errno = EINVAL;
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return NULL;
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}
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inline ssize_t flistxattr_(int fd, char *list, size_t size) {
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return extattr_list_fd(fd, EXTATTR_NAMESPACE_USER, list, size);
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}
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inline ssize_t fgetxattr_(int fd, const char *name, void *value, size_t size) {
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if (!(name = fbsd_extattr_skip_prefix(name)))
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return -1;
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return extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
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}
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inline int fsetxattr_(int fd, const char *name, const void *value, size_t size, int) {
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if (!(name = fbsd_extattr_skip_prefix(name)))
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return -1;
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return extattr_set_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
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}
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inline int fremovexattr_(int fd, const char *name) {
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if (!(name = fbsd_extattr_skip_prefix(name)))
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return -1;
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return extattr_delete_fd(fd, EXTATTR_NAMESPACE_USER, name);
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}
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/* mq_* functions are wrappers in FreeBSD so go through to underlying syscalls */
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#include <sys/syscall.h>
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extern "C" {
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extern int __sys_kmq_notify(int, const struct sigevent *);
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extern int __sys_kmq_open(const char *, int, mode_t, const struct mq_attr *);
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extern int __sys_kmq_setattr(int, const struct mq_attr *__restrict, struct mq_attr *__restrict);
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extern ssize_t __sys_kmq_timedreceive(int, char *__restrict, size_t,
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unsigned *__restrict, const struct timespec *__restrict);
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extern int __sys_kmq_timedsend(int, const char *, size_t, unsigned,
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const struct timespec *);
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extern int __sys_kmq_unlink(const char *);
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}
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#define mq_notify_ __sys_kmq_notify
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#define mq_open_ __sys_kmq_open
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#define mq_setattr_ __sys_kmq_setattr
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#define mq_getattr_(A, B) __sys_kmq_setattr(A, NULL, B)
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#define mq_timedreceive_ __sys_kmq_timedreceive
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#define mq_timedsend_ __sys_kmq_timedsend
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#define mq_unlink_ __sys_kmq_unlink
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#define mq_close_ close
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#include <sys/ptrace.h>
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inline long ptrace_(int request, pid_t pid, void *addr, void *data) {
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return ptrace(request, pid, (caddr_t)addr, static_cast<int>((long)data));
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}
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#define PTRACE_PEEKDATA_ PT_READ_D
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#define getegid_ getegid
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#define getgid_ getgid
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#define geteuid_ geteuid
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#define getuid_ getuid
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#define getgroups_ getgroups
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#define getrlimit_ getrlimit
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#define bind_ bind
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#define connect_ connect
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/* Features available */
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#if __FreeBSD_version >= 1000000
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#define HAVE_CHFLAGSAT
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#define HAVE_BINDAT
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#define HAVE_CONNECTAT
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#endif
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#define HAVE_CHFLAGS
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#define HAVE_GETFSSTAT
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#define HAVE_REVOKE
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#define HAVE_GETLOGIN
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#define HAVE_MKFIFOAT
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#define HAVE_SYSARCH
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#include <machine/sysarch.h>
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#define HAVE_STAT_BIRTHTIME
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#define HAVE_SYSCTL
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#define HAVE_FPATHCONF
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#define HAVE_F_DUP2FD
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#define HAVE_PSELECT
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#define HAVE_SCTP
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/* FreeBSD only allows root to call mlock[all]/munlock[all] */
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#define MLOCK_REQUIRES_ROOT 1
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/* FreeBSD effectively only allows root to call sched_setscheduler */
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#define SCHED_SETSCHEDULER_REQUIRES_ROOT 1
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#endif /* FreeBSD */
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/************************************************************
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* Linux
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************************************************************/
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#ifdef __linux__
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/prctl.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <sys/sendfile.h>
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#include <sys/statfs.h>
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#include <sys/xattr.h>
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#include <sys/mount.h>
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#include <linux/net.h>
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/* profil(2) has a first argument of unsigned short* */
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#define profil_arg1_t unsigned short
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static inline int getdents_(unsigned int fd, void *dirp, unsigned int count) {
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return syscall(__NR_getdents, fd, dirp, count);
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}
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/* A sample mount(2) call */
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static inline int bogus_mount_() {
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return mount("/dev/bogus", "/bogus", "debugfs", MS_RDONLY, "");
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}
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/* libc's getpid() wrapper caches the pid value, and doesn't invalidate
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* the cached value on pdfork(), so directly syscall. */
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static inline pid_t getpid_() {
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return syscall(__NR_getpid);
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}
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static inline int execveat(int fd, const char *path,
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char *const argv[], char *const envp[], int flags) {
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return syscall(__NR_execveat, fd, path, argv, envp, flags);
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}
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/*
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* Linux glibc includes an fexecve() function, implemented via the /proc
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* filesystem. Bypass this and go directly to the execveat(2) syscall.
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*/
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static inline int fexecve_(int fd, char *const argv[], char *const envp[]) {
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return execveat(fd, "", argv, envp, AT_EMPTY_PATH);
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}
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/*
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* Linux glibc attempts to be clever and intercepts various uid/gid functions.
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* Bypass by calling the syscalls directly.
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*/
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static inline gid_t getegid_(void) { return syscall(__NR_getegid); }
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static inline gid_t getgid_(void) { return syscall(__NR_getgid); }
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static inline uid_t geteuid_(void) { return syscall(__NR_geteuid); }
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static inline uid_t getuid_(void) { return syscall(__NR_getuid); }
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static inline int getgroups_(int size, gid_t list[]) { return syscall(__NR_getgroups, size, list); }
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static inline int getrlimit_(int resource, struct rlimit *rlim) {
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return syscall(__NR_getrlimit, resource, rlim);
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}
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/*
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* Linux glibc for i386 consumes the errno returned from the raw socketcall(2) operation,
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* so use the raw syscall for those operations that are disallowed in capability mode.
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*/
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#ifdef __NR_bind
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#define bind_ bind
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#else
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static inline int bind_(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
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unsigned long args[3] = {(unsigned long)sockfd, (unsigned long)(intptr_t)addr, (unsigned long)addrlen};
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return syscall(__NR_socketcall, SYS_BIND, args);
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}
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#endif
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#ifdef __NR_connect
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#define connect_ connect
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#else
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static inline int connect_(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
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unsigned long args[3] = {(unsigned long)sockfd, (unsigned long)(intptr_t)addr, (unsigned long)addrlen};
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return syscall(__NR_socketcall, SYS_CONNECT, args);
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}
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#endif
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#define mincore_ mincore
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#define sendfile_ sendfile
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#define flistxattr_ flistxattr
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#define fgetxattr_ fgetxattr
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#define fsetxattr_ fsetxattr
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#define fremovexattr_ fremovexattr
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#define mq_notify_ mq_notify
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#define mq_open_ mq_open
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#define mq_setattr_ mq_setattr
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#define mq_getattr_ mq_getattr
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#define mq_timedreceive_ mq_timedreceive
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#define mq_timedsend_ mq_timedsend
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#define mq_unlink_ mq_unlink
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#define mq_close_ mq_close
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#define ptrace_ ptrace
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#define PTRACE_PEEKDATA_ PTRACE_PEEKDATA
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/* Features available */
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#define HAVE_DUP3
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#define HAVE_PIPE2
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#include <sys/fsuid.h> /* for setfsgid()/setfsuid() */
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#define HAVE_SETFSUID
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#define HAVE_SETFSGID
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#define HAVE_READAHEAD
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#define HAVE_SEND_RECV_MMSG
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#define HAVE_SYNCFS
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#define HAVE_SYNC_FILE_RANGE
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#include <sys/uio.h> /* for vmsplice */
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#define HAVE_TEE
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#define HAVE_SPLICE
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#define HAVE_VMSPLICE
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#define HAVE_PSELECT
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#define HAVE_PPOLL
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#define HAVE_EXECVEAT
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#define HAVE_SYSCALL
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#define HAVE_MKNOD_REG
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#define HAVE_MKNOD_SOCKET
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/*
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* O_BENEATH is arch-specific, via <asm/fcntl.h>; however we cannot include both that file
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* and the normal <fcntl.h> as they have some clashing definitions. Bypass by directly
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* defining O_BENEATH, using the current proposed x86 value. (This will therefore not
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* work for non-x86, and may need changing in future if a different value gets merged.)
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*/
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#ifndef O_BENEATH
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#define O_BENEATH 040000000 /* no / or .. in openat path */
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#endif
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/* Linux allows anyone to call mlock[all]/munlock[all] */
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#define MLOCK_REQUIRES_ROOT 0
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/* Linux allows anyone to call sched_setscheduler */
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#define SCHED_SETSCHEDULER_REQUIRES_ROOT 1
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#endif /* Linux */
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#endif /*__SYSCALLS_H__*/
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