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|
#!/bin/sh
# panic: MNT_DEFERRED requires MNT_RECURSE | MNT_FORCE
# cpuid = 6
# time = 1766415391
# KDB: stack backtrace:
# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01003ffaf0
# vpanic() at vpanic+0x136/frame 0xfffffe01003ffc20
# panic() at panic+0x43/frame 0xfffffe01003ffc80
# dounmount() at dounmount+0xa49/frame 0xfffffe01003ffcf0
# kern_unmount() at kern_unmount+0x30c/frame 0xfffffe01003ffe00
# amd64_syscall() at amd64_syscall+0x169/frame 0xfffffe01003fff30
# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01003fff30
# --- syscall (0, FreeBSD ELF64, syscall), rip = 0x8227c1c1a, rsp = 0x8204589e8, rbp = 0x820458a50 ---
# KDB: enter: panic
# [ thread pid 67901 tid 1052310 ]
# Stopped at kdb_enter+0x33: movq $0,0x12132c2(%rip)
# db> x/s version
# version:FreeBSD 16.0-CURRENT #1 vmfqe-n282663-949b0dac6c83: Sun Dec 21 12:59:23 CET 2025
# pho@mercat1.netperf.freebsd.org:/var/tmp/deviant3/sys/amd64/compile/PHO\
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
set -u
prog=$(basename "$0" .sh)
cat > /tmp/$prog.c <<EOF
// https://syzkaller.appspot.com/bug?id=e5807bfa71ca13538ae5c94e160b0c959a40750d
// autogenerated by syzkaller (https://github.com/google/syzkaller)
// syzbot+1967136cd02c22bc6f0d@syzkaller.appspotmail.com
#define _GNU_SOURCE
#include <pwd.h>
#include <setjmp.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 <unistd.h>
static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;
static void segv_handler(int sig, siginfo_t* info, void* ctx __unused)
{
if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
exit(sig);
}
uintptr_t addr = (uintptr_t)info->si_addr;
const uintptr_t prog_start = 1 << 20;
const uintptr_t prog_end = 100 << 20;
int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
int valid = addr < prog_start || addr > prog_end;
if (sig == SIGBUS)
valid = 1;
if (skip && valid) {
_longjmp(segv_env, 1);
}
exit(sig);
}
static void install_segv_handler(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = segv_handler;
sa.sa_flags = SA_NODEFER | SA_SIGINFO;
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGBUS, &sa, NULL);
}
#define NONFAILING(...) \
({ \
int ok = 1; \
__atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
if (_setjmp(segv_env) == 0) { \
__VA_ARGS__; \
} else \
ok = 0; \
__atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
ok; \
})
uint64_t r[1] = {0xffffffffffffffff};
int main(void)
{
syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
/*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
/*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul,
/*fd=*/(intptr_t)-1, /*offset=*/0ul);
const char* reason;
(void)reason;
install_segv_handler();
intptr_t res = 0;
if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
}
// openat\$crypto arguments: [
// fd: const = 0xffffffffffffff9c (8 bytes)
// file: ptr[in, buffer] {
// buffer: {2f 64 65 76 2f 63 72 79 70 74 6f 00} (length 0xc)
// }
// flags: open_flags = 0x200 (8 bytes)
// mode: const = 0x0 (8 bytes)
// ]
// returns fd_crypto
NONFAILING(memcpy((void*)0x200000000040, "/dev/crypto\000", 12));
res = syscall(SYS_openat, /*fd=*/0xffffffffffffff9cul,
/*file=*/0x200000000040ul, /*flags=O_CREAT*/ 0x200ul,
/*mode=*/0ul);
if (res != -1)
r[0] = res;
// freebsd11_fstatfs arguments: [
// fd: fd (resource)
// buf: ptr[out, freebsd11_statfs] {
// freebsd11_statfs {
// version: int32 = 0x0 (4 bytes)
// type: int32 = 0x0 (4 bytes)
// flags: mount_flags = 0x0 (8 bytes)
// bsize: int64 = 0x0 (8 bytes)
// iosize: int64 = 0x0 (8 bytes)
// blocks: int64 = 0x0 (8 bytes)
// bfree: int64 = 0x0 (8 bytes)
// bavail: int64 = 0x0 (8 bytes)
// files: int64 = 0x0 (8 bytes)
// ffree: int64 = 0x0 (8 bytes)
// syncwrites: int64 = 0x0 (8 bytes)
// asyncwrites: int64 = 0x0 (8 bytes)
// syncreads: int64 = 0x0 (8 bytes)
// asyncreads: int64 = 0x0 (8 bytes)
// spare: array[int64] {
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// int64 = 0x0 (8 bytes)
// }
// namemax: int32 = 0x0 (4 bytes)
// owner: uid (resource)
// fsid: fsid {
// val: array[int32] {
// int32 = 0x0 (4 bytes)
// int32 = 0x0 (4 bytes)
// }
// }
// cspare: buffer: (DirOut)
// fstype: buffer: (DirOut)
// mnton: buffer: (DirOut)
// mntfrom: buffer: (DirOut)
// }
// }
// ]
syscall(SYS_freebsd11_fstatfs, /*fd=*/r[0], /*buf=*/0x200000000080ul);
// mprotect arguments: [
// addr: VMA[0x4000]
// len: len = 0x4000 (8 bytes)
// prot: mmap_prot = 0x1 (8 bytes)
// ]
syscall(SYS_mprotect, /*addr=*/0x200000000000ul, /*len=*/0x4000ul,
/*prot=PROT_READ*/ 1ul);
// unmount arguments: [
// path: ptr[in, buffer] {
// buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
// }
// flags: mount_flags = 0xc40006c8 (8 bytes)
// ]
NONFAILING(memcpy((void*)0x200000000200, "./file1\000", 8));
syscall(
SYS_unmount, /*path=*/0x200000000200ul,
/*flags=MNT_EXPORTANON|MNT_DEFEXPORTED|MNT_EXRDONLY|MNT_MULTILABEL|MNT_NOCLUSTERW|MNT_NOCLUSTERR|MNT_ASYNC|0x8*/
0xc40006c8ul);
return 0;
}
EOF
mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c -lpthread || exit 1
(cd ../testcases/swap; ./swap -t 3m -i 30 -l 100 > /dev/null 2>&1) &
sleep 5
kldstat | grep -q cryptodev && loaded=0 || { kldload cryptodev.ko && loaded=1; }
work=/tmp/$prog.dir
rm -rf $work
mkdir $work
cd /tmp/$prog.dir
for i in `jot 30`; do
(
mkdir d$i
cd d$i
timeout 3m /tmp/$prog > /dev/null 2>&1 &
)
done
while pgrep -q $prog; do sleep 2; done
while pkill swap; do :; done
wait
rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core $work
[ $loaded -eq 1 ] && kldunload cryptodev.ko
exit 0
|
