sys/test: add more tests

Add syz_errno syscall which sets errno to the argument,
and add a test with different errno values.
This mostly tests the testing infrastructure itself.

Add syz_compare syscall which compare two blobs,
this can be used for testing of argument memory layout.

Implement syz_mmap and fix Makefile to allow building syz-execprog for test OS.
Useful for debugging.

Update #603

3 files changed, 47 insertions, 4 deletions

diff --git a/executor/common_test.h b/executor/common_test.h
index 78b3f8e22..75ec81721 100644
--- a/executor/common_test.h
+++ b/executor/common_test.h
@@ -7,8 +7,43 @@
 #include <unistd.h>
 
 #if SYZ_EXECUTOR || __NR_syz_mmap
+#include <sys/mman.h>
+
+// syz_mmap(addr vma, len len[addr])
 static long syz_mmap(long a0, long a1)
 {
+	return (long)mmap((void*)a0, a1, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0);
+}
+#endif
+
+#if SYZ_EXECUTOR || __NR_syz_errno
+#include <errno.h>
+
+// syz_errno(v int32)
+static long syz_errno(long v)
+{
+	errno = v;
+	return v == 0 ? 0 : -1;
+}
+#endif
+
+#if SYZ_EXECUTOR || __NR_syz_compare
+#include <errno.h>
+#include <string.h>
+
+// syz_compare(want ptr[in, string], want_len len[want], got ptr[in, compare_data], got_len len[got])
+static long syz_compare(long want, long want_len, long got, long got_len)
+{
+	if (want_len != got_len) {
+		debug("syz_compare: want_len=%lu got_len=%lu\n", want_len, got_len);
+		errno = EBADF;
+		return -1;
+	}
+	if (memcmp((void*)want, (void*)got, want_len)) {
+		debug("syz_compare: data differs\n");
+		errno = EINVAL;
+		return -1;
+	}
 	return 0;
 }
 #endif
diff --git a/executor/defs.h b/executor/defs.h
index bd92a80b2..eb73e512d 100644
--- a/executor/defs.h
+++ b/executor/defs.h
@@ -130,7 +130,7 @@
 
 #if GOARCH_32_fork_shmem
 #define GOARCH "32_fork_shmem"
-#define SYZ_REVISION "18f983f4760ca5ac41eaf7c18bd9f487f6dde42b"
+#define SYZ_REVISION "d09983a8bb4f2ccd0e303191862d170b5b636bd8"
 #define SYZ_EXECUTOR_USES_FORK_SERVER 1
 #define SYZ_EXECUTOR_USES_SHMEM 1
 #define SYZ_PAGE_SIZE 4096
@@ -140,7 +140,7 @@
 
 #if GOARCH_32_shmem
 #define GOARCH "32_shmem"
-#define SYZ_REVISION "9d4e8ff9d9c38d5fe7cdc046adcde8be29782e6b"
+#define SYZ_REVISION "8d0f255b4d310c70d0e7d65ac8e5c6c3032a9e14"
 #define SYZ_EXECUTOR_USES_FORK_SERVER 0
 #define SYZ_EXECUTOR_USES_SHMEM 1
 #define SYZ_PAGE_SIZE 8192
@@ -150,7 +150,7 @@
 
 #if GOARCH_64
 #define GOARCH "64"
-#define SYZ_REVISION "981444b6842c8896801fdf67dc75c454cad9e594"
+#define SYZ_REVISION "285bb68296c57fc93062731e5c0ecfbfc105d685"
 #define SYZ_EXECUTOR_USES_FORK_SERVER 0
 #define SYZ_EXECUTOR_USES_SHMEM 0
 #define SYZ_PAGE_SIZE 4096
@@ -160,7 +160,7 @@
 
 #if GOARCH_64_fork
 #define GOARCH "64_fork"
-#define SYZ_REVISION "1c9fe1f1a1f6f871fc5c088ca80174655322aca4"
+#define SYZ_REVISION "39c2288dd1c825ce7a587f946cfc91e0e453cf5e"
 #define SYZ_EXECUTOR_USES_FORK_SERVER 1
 #define SYZ_EXECUTOR_USES_SHMEM 0
 #define SYZ_PAGE_SIZE 8192
diff --git a/executor/syscalls.h b/executor/syscalls.h
index a8845adb5..6f53b4490 100644
--- a/executor/syscalls.h
+++ b/executor/syscalls.h
@@ -11439,6 +11439,8 @@ const call_t syscalls[] = {
 
 #if GOARCH_32_fork_shmem
 const call_t syscalls[] = {
+    {"syz_compare", 0, (syscall_t)syz_compare},
+    {"syz_errno", 0, (syscall_t)syz_errno},
     {"syz_mmap", 0, (syscall_t)syz_mmap},
 
 };
@@ -11446,6 +11448,8 @@ const call_t syscalls[] = {
 
 #if GOARCH_32_shmem
 const call_t syscalls[] = {
+    {"syz_compare", 0, (syscall_t)syz_compare},
+    {"syz_errno", 0, (syscall_t)syz_errno},
     {"syz_mmap", 0, (syscall_t)syz_mmap},
 
 };
@@ -11472,6 +11476,8 @@ const call_t syscalls[] = {
     {"mutate8", 0},
     {"serialize0", 0},
     {"serialize1", 0},
+    {"syz_compare", 0, (syscall_t)syz_compare},
+    {"syz_errno", 0, (syscall_t)syz_errno},
     {"syz_mmap", 0, (syscall_t)syz_mmap},
     {"test", 0},
     {"test$align0", 0},
@@ -11566,6 +11572,8 @@ const call_t syscalls[] = {
 
 #if GOARCH_64_fork
 const call_t syscalls[] = {
+    {"syz_compare", 0, (syscall_t)syz_compare},
+    {"syz_errno", 0, (syscall_t)syz_errno},
     {"syz_mmap", 0, (syscall_t)syz_mmap},
 
 };