Ricardo Branco
f4ae41b7ea
These system calls exist to decouple the Linux filesystem credentials from the effective credentials, avoiding signal exposure during privilege transitions. The signal permission model that motivated this was revised in Linux 2.0, making these syscalls obsolete for new applications. Implement both syscalls as no-ops that return the current effective UID/GID as the previous filesystem UID/GID. Linux returns the previous filesystem UID/GID for these syscalls with no error indication. Same for the equivalent setfsuid16() & setfsgid16() system calls. Signed-off-by: Ricardo Branco <rbranco@suse.de> PR: 294879 Reviewed by: kib, pouria Pull-Request: https://github.com/freebsd/freebsd-src/pull/2175
155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2013 Dmitry Chagin <dchagin@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sdt.h>
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#include <sys/proc.h>
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/*
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* Including linux vs linux32 here is arbitrary -- the syscall args structures
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* (proto.h) are not dereferenced by the DUMMY stub implementations, and
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* suitable for use by both native and compat32 entrypoints.
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*/
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#include <compat/linux/linux_dtrace.h>
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#include <compat/linux/linux_util.h>
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/* DTrace init */
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LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
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UNIMPLEMENTED(afs_syscall);
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UNIMPLEMENTED(create_module); /* Added in Linux 1.0 removed in 2.6. */
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UNIMPLEMENTED(epoll_ctl_old);
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UNIMPLEMENTED(epoll_wait_old);
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UNIMPLEMENTED(get_kernel_syms); /* Added in Linux 1.0 removed in 2.6. */
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UNIMPLEMENTED(getpmsg);
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UNIMPLEMENTED(nfsservctl); /* Added in Linux 2.2 removed in 3.1. */
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UNIMPLEMENTED(putpmsg);
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UNIMPLEMENTED(query_module); /* Added in Linux 2.2 removed in 2.6. */
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UNIMPLEMENTED(security);
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UNIMPLEMENTED(vserver);
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DUMMY(vhangup);
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DUMMY(pivot_root);
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DUMMY(adjtimex);
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DUMMY(swapoff);
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DUMMY(init_module);
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DUMMY(delete_module);
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DUMMY(lookup_dcookie);
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DUMMY(remap_file_pages);
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DUMMY(mbind);
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DUMMY(get_mempolicy);
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DUMMY(set_mempolicy);
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DUMMY(kexec_load);
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/* Linux 2.6.11: */
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DUMMY(add_key);
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DUMMY(request_key);
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DUMMY(keyctl);
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/* Linux 2.6.16: */
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DUMMY(migrate_pages);
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DUMMY(unshare);
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/* Linux 2.6.17: */
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DUMMY(tee);
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DUMMY(vmsplice);
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/* Linux 2.6.18: */
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DUMMY(move_pages);
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/* Linux 2.6.27: */
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DUMMY(signalfd4);
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/* Linux 2.6.31: */
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DUMMY(perf_event_open);
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/* Linux 2.6.36: */
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DUMMY(fanotify_init);
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DUMMY(fanotify_mark);
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/* Linux 2.6.39: */
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DUMMY(clock_adjtime);
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/* Linux 3.0: */
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DUMMY(setns);
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/* Linux 3.2: */
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DUMMY(process_vm_readv);
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DUMMY(process_vm_writev);
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/* Linux 3.8: */
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DUMMY(finit_module);
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DUMMY(sched_setattr);
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DUMMY(sched_getattr);
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/* Linux 3.18: */
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DUMMY(bpf);
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/* Linux 3.19: */
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DUMMY(execveat);
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/* Linux 4.2: */
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DUMMY(userfaultfd);
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/* Linux 4.4: */
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DUMMY(mlock2);
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/* Linux 4.6: */
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DUMMY(preadv2);
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DUMMY(pwritev2);
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/* Linux 4.8: */
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DUMMY(pkey_mprotect);
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DUMMY(pkey_alloc);
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DUMMY(pkey_free);
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/* Linux 4.18: */
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DUMMY(io_pgetevents);
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/* Linux 5.1: */
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DUMMY(pidfd_send_signal);
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DUMMY(io_uring_setup);
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DUMMY(io_uring_enter);
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DUMMY(io_uring_register);
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/* Linux 5.2: */
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DUMMY(open_tree);
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DUMMY(move_mount);
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DUMMY(fsopen);
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DUMMY(fsconfig);
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DUMMY(fsmount);
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DUMMY(fspick);
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/* Linux 5.3: */
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DUMMY(pidfd_open);
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/* Linux 5.6: */
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DUMMY(openat2);
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DUMMY(pidfd_getfd);
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/* Linux 5.10: */
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DUMMY(process_madvise);
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/* Linux 5.12: */
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DUMMY(mount_setattr);
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/* Linux 5.13: */
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DUMMY(landlock_create_ruleset);
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DUMMY(landlock_add_rule);
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DUMMY(landlock_restrict_self);
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/* Linux 5.14: */
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DUMMY(memfd_secret);
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DUMMY(quotactl_fd);
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/* Linux 5.15: */
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DUMMY(process_mrelease);
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/* Linux 5.16: */
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DUMMY(futex_waitv);
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DUMMY(set_mempolicy_home_node);
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/* Linux 6.5: */
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DUMMY(cachestat);
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/* Linux 6.6: */
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DUMMY(fchmodat2);
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