Add tests for filesystem-disk code paths when OS features are missing.

c++/src/kj/filesystem-disk-generic-test.c++

+// Copyright (c) 2016 Sandstorm Development Group, Inc. and contributors
+// Licensed under the MIT License:
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+// This test compiles filesystem-disk.c++ with various features #undefed, causing it to take
+// different code paths, then runs filesystem-disk-test.c++ against that.
+
+#include "filesystem.h"
+#include "debug.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <dirent.h>
+#include <syscall.h>
+#include "vector.h"
+#include "miniposix.h"
+
+#undef __linux__
+#undef O_CLOEXEC
+#undef O_DIRECTORY
+#undef O_TMPFILE
+#undef FIOCLEX
+#undef DT_UNKNOWN
+#undef F_DUPFD_CLOEXEC
+#undef FALLOC_FL_PUNCH_HOLE
+#undef FICLONE
+#undef FICLONERANGE
+#undef SEEK_HOLE
+#undef SEEK_DATA
+#undef RENAME_EXCHANGE
+
+#define HOLES_NOT_SUPPORTED
+
+#include "filesystem-disk.c++"
+#include "filesystem-disk-test.c++"

c++/src/kj/filesystem-disk-old-kernel-test.c++

+// Copyright (c) 2016 Sandstorm Development Group, Inc. and contributors
+// Licensed under the MIT License:
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#if __linux__ && __x86_64__ && defined(__has_include)
+#if __has_include(<linux/seccomp.h>) && \
+    __has_include(<linux/filter.h>) && \
+    __has_include(<linux/audit.h>) && \
+    __has_include(<linux/signal.h>) && \
+    __has_include(<sys/ptrace.h>)
+// This test re-runs filesystem-disk-test.c++ with newfangled Linux kernel features disabled.
+//
+// This test must be complied as a separate program, since it alters the calling process by
+// enabling seccomp to disable the kernel features.
+
+#include <syscall.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+#include <sys/ptrace.h>
+#include <linux/seccomp.h>
+#include <linux/filter.h>
+#include <kj/debug.h>
+
+#ifdef SECCOMP_SET_MODE_FILTER
+
+namespace {
+
+#if 0
+// Source code of the seccomp filter:
+
+  ld [0]                  /* offsetof(struct seccomp_data, nr) */
+  jeq #8, lseek           /* __NR_lseek */
+  jeq #16, inval          /* __NR_ioctl */
+  jeq #40, nosys          /* __NR_sendfile */
+  jeq #257, openat        /* __NR_openat */
+  jeq #285, notsup        /* __NR_fallocate */
+  jeq #316, nosys         /* __NR_renameat2 */
+  jmp good
+
+openat:
+  ld [32]                 /* offsetof(struct seccomp_data, args[2]), aka flags */
+  and #4259840            /* O_TMPFILE */
+  jeq #4259840, notsup
+  jmp good
+
+lseek:
+  ld [32]                 /* offsetof(struct seccomp_data, args[2]), aka whence */
+  jeq #3, inval           /* SEEK_DATA */
+  jeq #4, inval           /* SEEK_HOLE */
+  jmp good
+
+inval:  ret #0x00050016  /* SECCOMP_RET_ERRNO | EINVAL */
+nosys:  ret #0x00050026  /* SECCOMP_RET_ERRNO | ENOSYS */
+notsup: ret #0x0005005f  /* SECCOMP_RET_ERRNO | EOPNOTSUPP */
+good:   ret #0x7fff0000  /* SECCOMP_RET_ALLOW */
+
+#endif
+
+struct SetupSeccompForFilesystemTest {
+  SetupSeccompForFilesystemTest() {
+    struct sock_filter filter[] {
+      { 0x20,  0,  0, 0000000000 },
+      { 0x15, 10,  0, 0x00000008 },
+      { 0x15, 13,  0, 0x00000010 },
+      { 0x15, 13,  0, 0x00000028 },
+      { 0x15,  3,  0, 0x00000101 },
+      { 0x15, 12,  0, 0x0000011d },
+      { 0x15, 10,  0, 0x0000013c },
+      { 0x05,  0,  0, 0x0000000b },
+      { 0x20,  0,  0, 0x00000020 },
+      { 0x54,  0,  0, 0x00410000 },
+      { 0x15,  7,  0, 0x00410000 },
+      { 0x05,  0,  0, 0x00000007 },
+      { 0x20,  0,  0, 0x00000020 },
+      { 0x15,  2,  0, 0x00000003 },
+      { 0x15,  1,  0, 0x00000004 },
+      { 0x05,  0,  0, 0x00000003 },
+      { 0x06,  0,  0, 0x00050016 },
+      { 0x06,  0,  0, 0x00050026 },
+      { 0x06,  0,  0, 0x0005005f },
+      { 0x06,  0,  0, 0x7fff0000 },
+    };
+
+    struct sock_fprog prog { sizeof(filter) / sizeof(filter[0]), filter };
+
+    KJ_SYSCALL(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
+    KJ_SYSCALL(syscall(__NR_seccomp, SECCOMP_SET_MODE_FILTER, 0, &prog));
+  }
+};
+
+SetupSeccompForFilesystemTest setupSeccompForFilesystemTest;
+
+}  // namespace
+
+#define HOLES_NOT_SUPPORTED
+
+// OK, now run all the regular filesystem tests!
+#include "filesystem-disk-test.c++"
+
+#endif
+#endif
+#endif