Dmitry V. Levin
01d45b6c2b
Follow linux kernel commit v4.14-rc2~15^2~4 and rename SECCOMP_RET_KILL to SECCOMP_RET_KILL_THREAD. * xlat/seccomp_ret_action.in (SECCOMP_RET_KILL): Rename to SECCOMP_RET_KILL_THREAD. * tests/prctl-seccomp-filter-v.c (main): Update expected output. * tests/seccomp-filter-v.c (main): Likewise.
145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
/*
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* Check verbose decoding of prctl PR_SET_SECCOMP SECCOMP_MODE_FILTER.
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*
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* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016-2017 The strace developers.
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* All rights reserved.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <stddef.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <asm/unistd.h>
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#ifdef HAVE_PRCTL
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# include <sys/prctl.h>
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#endif
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#ifdef HAVE_LINUX_SECCOMP_H
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# include <linux/seccomp.h>
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#endif
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#include <linux/filter.h>
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#if defined HAVE_PRCTL \
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&& defined PR_SET_NO_NEW_PRIVS \
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&& defined PR_SET_SECCOMP \
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&& defined SECCOMP_MODE_FILTER \
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&& defined SECCOMP_RET_ERRNO \
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&& defined BPF_JUMP \
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&& defined BPF_STMT
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#define SOCK_FILTER_ALLOW_SYSCALL(nr) \
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BPF_JUMP(BPF_JMP|BPF_K|BPF_JEQ, __NR_ ## nr, 0, 1), \
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BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW)
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#define SOCK_FILTER_DENY_SYSCALL(nr, err) \
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BPF_JUMP(BPF_JMP|BPF_K|BPF_JEQ, __NR_ ## nr, 0, 1), \
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BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO|(SECCOMP_RET_DATA & (err)))
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#define SOCK_FILTER_KILL_PROCESS \
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BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL)
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#define PRINT_ALLOW_SYSCALL(nr) \
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printf("BPF_JUMP(BPF_JMP|BPF_K|BPF_JEQ, %#x, 0, 0x1), " \
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"BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), ", \
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__NR_ ## nr)
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#define PRINT_DENY_SYSCALL(nr, err) \
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printf("BPF_JUMP(BPF_JMP|BPF_K|BPF_JEQ, %#x, 0, 0x1), " \
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"BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO|%#x), ", \
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__NR_ ## nr, err)
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static const struct sock_filter filter[] = {
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/* load syscall number */
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BPF_STMT(BPF_LD|BPF_W|BPF_ABS, offsetof(struct seccomp_data, nr)),
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/* allow syscalls */
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SOCK_FILTER_ALLOW_SYSCALL(close),
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SOCK_FILTER_ALLOW_SYSCALL(exit),
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SOCK_FILTER_ALLOW_SYSCALL(exit_group),
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/* deny syscalls */
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SOCK_FILTER_DENY_SYSCALL(sync, EBUSY),
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SOCK_FILTER_DENY_SYSCALL(setsid, EPERM),
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/* kill process */
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SOCK_FILTER_KILL_PROCESS
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};
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static const struct sock_fprog prog = {
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.len = ARRAY_SIZE(filter),
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.filter = (struct sock_filter *) filter,
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};
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int
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main(void)
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{
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int fds[2];
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puts("prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0");
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printf("prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, {len=%u, filter=[",
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prog.len);
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printf("BPF_STMT(BPF_LD|BPF_W|BPF_ABS, %#x), ",
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(unsigned) offsetof(struct seccomp_data, nr));
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PRINT_ALLOW_SYSCALL(close);
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PRINT_ALLOW_SYSCALL(exit);
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PRINT_ALLOW_SYSCALL(exit_group);
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PRINT_DENY_SYSCALL(sync, EBUSY),
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PRINT_DENY_SYSCALL(setsid, EPERM),
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printf("BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD)");
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puts("]}) = 0");
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puts("+++ exited with 0 +++");
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fflush(stdout);
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close(0);
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close(1);
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if (pipe(fds))
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perror_msg_and_fail("pipe");
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if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0))
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perror_msg_and_skip("PR_SET_NO_NEW_PRIVS");
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if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog))
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perror_msg_and_skip("PR_SET_SECCOMP");
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if (close(0) || close(1))
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_exit(77);
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_exit(0);
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}
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#else
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SKIP_MAIN_UNDEFINED("HAVE_PRCTL && PR_SET_NO_NEW_PRIVS && PR_SET_SECCOMP"
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" && SECCOMP_MODE_FILTER && SECCOMP_RET_ERRNO"
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" && BPF_JUMP && BPF_STMT")
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#endif
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