Date: Sat, 19 Aug 2023 07:30:03 GMT From: Peter Holm <pho@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: f322816aafa7 - main - stress2: Added a syzkaller reproducer Message-ID: <202308190730.37J7U314038306@gitrepo.freebsd.org>
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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
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