git: a7d46ad08709 - main - stress2: Added a syzkaller reproducer

[Peter Holm]

The branch main has been updated by pho:

URL: https://cgit.FreeBSD.org/src/commit/?id=a7d46ad0870987c2fdf93a30507f61ca8d82babe

commit a7d46ad0870987c2fdf93a30507f61ca8d82babe
Author:     Peter Holm <pho at FreeBSD.org>
AuthorDate: 2021-05-03 07:05:32 +0000
Commit:     Peter Holm <pho at FreeBSD.org>
CommitDate: 2021-05-03 07:05:32 +0000

    stress2: Added a syzkaller reproducer
---
 tools/test/stress2/misc/syzkaller34.sh | 119 +++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)

diff --git a/tools/test/stress2/misc/syzkaller34.sh b/tools/test/stress2/misc/syzkaller34.sh
new file mode 100755
index 000000000000..c426fef129b1
--- /dev/null
+++ b/tools/test/stress2/misc/syzkaller34.sh
@@ -0,0 +1,119 @@
+#!/bin/sh
+
+# Fixed by git: 208256579804 - main - O_PATH: disable kqfilter for fifos
+# Submitted by markj@
+
+[ `uname -p` != "amd64" ] && exit 0
+
+. ../default.cfg
+cat > /tmp/syzkaller34.c <<EOF
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/endian.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+static void kill_and_wait(int pid, int* status)
+{
+  kill(pid, SIGKILL);
+  while (waitpid(-1, status, 0) != pid) {
+  }
+}
+
+static void sleep_ms(uint64_t ms)
+{
+  usleep(ms * 1000);
+}
+
+static uint64_t current_time_ms(void)
+{
+  struct timespec ts;
+  if (clock_gettime(CLOCK_MONOTONIC, &ts))
+    exit(1);
+  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
+}
+
+static void execute_one(void);
+
+#define WAIT_FLAGS 0
+
+static void loop(void)
+{
+  int iter = 0;
+  for (;; iter++) {
+    int pid = fork();
+    if (pid < 0)
+      exit(1);
+    if (pid == 0) {
+      execute_one();
+      exit(0);
+    }
+    int status = 0;
+    uint64_t start = current_time_ms();
+    for (;;) {
+      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
+        break;
+      sleep_ms(1);
+      if (current_time_ms() - start < 5000) {
+        continue;
+      }
+      kill_and_wait(pid, &status);
+      break;
+    }
+  }
+}
+
+uint64_t r[1] = {0xffffffffffffffff};
+
+void execute_one(void)
+{
+  intptr_t res = 0;
+  memcpy((void*)0x20000000, "./file0\000", 8);
+  syscall(SYS_mknodat, 0xffffff9c, 0x20000000ul, 0x1000ul, 0ul);
+  memcpy((void*)0x20000040, "./file0\000", 8);
+  syscall(SYS_open, 0x20000040ul, 0x400000ul, 0x72ul);
+  res = syscall(SYS_kqueue);
+  if (res != -1)
+    r[0] = res;
+  *(uint64_t*)0x20000100 = 3;
+  *(uint16_t*)0x20000108 = -1;
+  *(uint16_t*)0x2000010a = 0x4015;
+  *(uint32_t*)0x2000010c = 0;
+  *(uint64_t*)0x20000110 = 0x400000000;
+  *(uint64_t*)0x20000118 = 5;
+  *(uint64_t*)0x20000120 = 4;
+  *(uint64_t*)0x20000128 = 0;
+  *(uint64_t*)0x20000130 = 0;
+  *(uint64_t*)0x20000138 = 0;
+  syscall(SYS_kevent, r[0], 0x20000100ul, 0x2cul, 0ul, 0ul, 0ul);
+}
+int main(void)
+{
+  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
+  loop();
+  return 0;
+}
+
+
+EOF
+mycc -o /tmp/syzkaller34 -Wall -Wextra -O0 /tmp/syzkaller34.c ||
+    exit 1
+
+(cd /tmp; timeout 3m ./syzkaller34)
+
+rm -rf /tmp/syzkaller34 syzkaller34.c /tmp/syzkaller.*
+exit 0