git: f322816aafa7 - main - stress2: Added a syzkaller reproducer
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Date: Sat, 19 Aug 2023 07:30:03 UTC
The branch main has been updated by pho:
URL: https://cgit.FreeBSD.org/src/commit/?id=f322816aafa759d618ff89da266c038d0694e189
commit f322816aafa759d618ff89da266c038d0694e189
Author: Peter Holm <pho@FreeBSD.org>
AuthorDate: 2023-08-19 07:28:10 +0000
Commit: Peter Holm <pho@FreeBSD.org>
CommitDate: 2023-08-19 07:28:10 +0000
stress2: Added a syzkaller reproducer
---
tools/test/stress2/misc/syzkaller70.sh | 302 +++++++++++++++++++++++++++++++++
1 file changed, 302 insertions(+)
diff --git a/tools/test/stress2/misc/syzkaller70.sh b/tools/test/stress2/misc/syzkaller70.sh
new file mode 100755
index 000000000000..7f63da7f6475
--- /dev/null
+++ b/tools/test/stress2/misc/syzkaller70.sh
@@ -0,0 +1,302 @@
+#!/bin/sh
+
+# db:1:pho1> bt
+# Tracing pid 5640 tid 102468 td 0xfffffe00e4d26ac0
+# kdb_enter() at kdb_enter+0x32/frame 0xfffffe010dbcf260
+# vpanic() at vpanic+0x163/frame 0xfffffe010dbcf390
+# panic() at panic+0x43/frame 0xfffffe010dbcf3f0
+# vm_map_insert1() at vm_map_insert1+0x147/frame 0xfffffe010dbcf4a0
+# vm_map_insert() at vm_map_insert+0x69/frame 0xfffffe010dbcf510
+# vm_map_growstack() at vm_map_growstack+0x90e/frame 0xfffffe010dbcf650
+# vm_map_lookup() at vm_map_lookup+0x15f/frame 0xfffffe010dbcf6e0
+# vm_fault() at vm_fault+0x12f/frame 0xfffffe010dbcf820
+# vm_fault_trap() at vm_fault_trap+0x6f/frame 0xfffffe010dbcf860
+# trap_pfault() at trap_pfault+0x24a/frame 0xfffffe010dbcf8d0
+# calltrap() at calltrap+0x8/frame 0xfffffe010dbcf8d0
+# --- trap 0xc, rip = 0xffffffff81057a06, rsp = 0xfffffe010dbcf9a0, rbp = 0xfffffe010dbcf9a0 ---
+# copyin_nosmap_erms() at copyin_nosmap_erms+0x156/frame 0xfffffe010dbcf9a0
+# uiomove_fromphys() at uiomove_fromphys+0x145/frame 0xfffffe010dbcfa10
+# uiomove_object_page() at uiomove_object_page+0x1dc/frame 0xfffffe010dbcfa70
+# uiomove_object() at uiomove_object+0xa4/frame 0xfffffe010dbcfac0
+# tmpfs_write() at tmpfs_write+0xe4/frame 0xfffffe010dbcfb10
+# VOP_WRITE_APV() at VOP_WRITE_APV+0xcf/frame 0xfffffe010dbcfc20
+# vn_write() at vn_write+0x2f4/frame 0xfffffe010dbcfcb0
+# vn_io_fault() at vn_io_fault+0x1e2/frame 0xfffffe010dbcfd40
+# dofilewrite() at dofilewrite+0x82/frame 0xfffffe010dbcfd90
+# kern_pwritev() at kern_pwritev+0x64/frame 0xfffffe010dbcfdd0
+# sys_pwritev() at sys_pwritev+0x3a/frame 0xfffffe010dbcfe00
+# amd64_syscall() at amd64_syscall+0x14f/frame 0xfffffe010dbcff30
+# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe010dbcff30
+# --- syscall (0, FreeBSD ELF64, syscall), rip = 0x822d56fca, rsp = 0x824255f58, rbp = 0x824255f90 ---
+# FreeBSD 14.0-ALPHA1 #1 main-n264742-81b41b2ef5bfd5-dirty: Tue Aug 15 19:52:50 CEST 2023
+
+uname -p | grep -Eq "amd64" || exit 0
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+. ../default.cfg
+prog=$(basename "$0" .sh)
+cat > /tmp/$prog.c <<EOF
+// https://syzkaller.appspot.com/bug?id=4c33ed3d5a9072d2ccaec3b2ef7a129f0997f477
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+// Reported-by: syzbot+c325d6a75e4fd0a68714@syzkaller.appspotmail.com
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <pthread.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 thread_start(void* (*fn)(void*), void* arg)
+{
+ pthread_t th;
+ pthread_attr_t attr;
+ pthread_attr_init(&attr);
+ pthread_attr_setstacksize(&attr, 128 << 10);
+ int i = 0;
+ for (; i < 100; i++) {
+ if (pthread_create(&th, &attr, fn, arg) == 0) {
+ pthread_attr_destroy(&attr);
+ return;
+ }
+ if (errno == EAGAIN) {
+ usleep(50);
+ continue;
+ }
+ break;
+ }
+ exit(1);
+}
+
+typedef struct {
+ pthread_mutex_t mu;
+ pthread_cond_t cv;
+ int state;
+} event_t;
+
+static void event_init(event_t* ev)
+{
+ if (pthread_mutex_init(&ev->mu, 0))
+ exit(1);
+ if (pthread_cond_init(&ev->cv, 0))
+ exit(1);
+ ev->state = 0;
+}
+
+static void event_reset(event_t* ev)
+{
+ ev->state = 0;
+}
+
+static void event_set(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ if (ev->state)
+ exit(1);
+ ev->state = 1;
+ pthread_mutex_unlock(&ev->mu);
+ pthread_cond_broadcast(&ev->cv);
+}
+
+static void event_wait(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ while (!ev->state)
+ pthread_cond_wait(&ev->cv, &ev->mu);
+ pthread_mutex_unlock(&ev->mu);
+}
+
+static int event_isset(event_t* ev)
+{
+ pthread_mutex_lock(&ev->mu);
+ int res = ev->state;
+ pthread_mutex_unlock(&ev->mu);
+ return res;
+}
+
+static int event_timedwait(event_t* ev, uint64_t timeout)
+{
+ uint64_t start = current_time_ms();
+ uint64_t now = start;
+ pthread_mutex_lock(&ev->mu);
+ for (;;) {
+ if (ev->state)
+ break;
+ uint64_t remain = timeout - (now - start);
+ struct timespec ts;
+ ts.tv_sec = remain / 1000;
+ ts.tv_nsec = (remain % 1000) * 1000 * 1000;
+ pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
+ now = current_time_ms();
+ if (now - start > timeout)
+ break;
+ }
+ int res = ev->state;
+ pthread_mutex_unlock(&ev->mu);
+ return res;
+}
+
+struct thread_t {
+ int created, call;
+ event_t ready, done;
+};
+
+static struct thread_t threads[16];
+static void execute_call(int call);
+static int running;
+
+static void* thr(void* arg)
+{
+ struct thread_t* th = (struct thread_t*)arg;
+ for (;;) {
+ event_wait(&th->ready);
+ event_reset(&th->ready);
+ execute_call(th->call);
+ __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
+ event_set(&th->done);
+ }
+ return 0;
+}
+
+static void execute_one(void)
+{
+ int i, call, thread;
+ for (call = 0; call < 4; call++) {
+ for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
+ thread++) {
+ struct thread_t* th = &threads[thread];
+ if (!th->created) {
+ th->created = 1;
+ event_init(&th->ready);
+ event_init(&th->done);
+ event_set(&th->done);
+ thread_start(thr, th);
+ }
+ if (!event_isset(&th->done))
+ continue;
+ event_reset(&th->done);
+ th->call = call;
+ __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
+ event_set(&th->ready);
+ event_timedwait(&th->done, 50);
+ break;
+ }
+ }
+ for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
+ sleep_ms(1);
+}
+
+static void execute_one(void);
+
+#define WAIT_FLAGS 0
+
+static void loop(void)
+{
+ int iter __unused = 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_call(int call)
+{
+ intptr_t res = 0;
+ switch (call) {
+ case 0:
+ memcpy((void*)0x20000240, "./file0\000", 8);
+ res = syscall(SYS_open, /*file=*/0x20000240ul,
+ /*flags=*/0x40000400000002c2ul, /*mode=*/0ul);
+ if (res != -1)
+ r[0] = res;
+ break;
+ case 1:
+ *(uint64_t*)0x20000080 = 0x200006c0;
+ *(uint64_t*)0x20000088 = 0x100000;
+ syscall(SYS_pwritev, /*fd=*/r[0], /*vec=*/0x20000080ul, /*vlen=*/1ul,
+ /*off=*/0ul);
+ break;
+ case 2:
+ syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x200000ul, /*prot=*/3ul,
+ /*flags=*/0x410ul, /*fd=*/-1, /*offset=*/0ul);
+ break;
+ case 3:
+ syscall(SYS_mmap, /*addr=*/0x2000c000ul, /*len=*/0x4000ul, /*prot=*/0ul,
+ /*flags=*/0x2010ul, /*fd=*/-1, /*offset=*/0ul);
+ break;
+ }
+}
+int main(void)
+{
+ syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
+ /*flags=*/0x1012ul, /*fd=*/-1, /*offset=*/0ul);
+ loop();
+ return 0;
+}
+EOF
+mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c -lpthread || exit 1
+
+mount | grep -q "on $mntpoint " && umount $mntpoint
+mount -o size=10m -t tmpfs dummy $mntpoint
+
+cd $mntpoint
+for i in `jot 20`; do
+ timeout 3m /tmp/$prog &
+done
+wait
+cd -
+
+umount $mntpoint
+rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core
+exit 0