Message-ID: <20241211065456.128f6a00@hermes.local>
Date: Wed, 11 Dec 2024 06:54:56 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Subject: Fw: [Bug 219589] New: Warning at net/ipv4/ipmr.c:440



Begin forwarded message:

Date: Wed, 11 Dec 2024 12:44:55 +0000
From: bugzilla-daemon@...nel.org
To: stephen@...workplumber.org
Subject: [Bug 219589] New: Warning at net/ipv4/ipmr.c:440


https://bugzilla.kernel.org/show_bug.cgi?id=219589

            Bug ID: 219589
           Summary: Warning at net/ipv4/ipmr.c:440
           Product: Networking
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: IPV4
          Assignee: stephen@...workplumber.org
          Reporter: 0599jiangyc@...il.com
        Regression: No

PoC (might not be stably reproduced):
```
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <linux/sched.h>

#ifndef __NR_clone3
#define __NR_clone3 435
#endif
#ifndef __NR_seccomp
#define __NR_seccomp 317
#endif

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

#define USLEEP_FORKED_CHILD (3 * 50 * 1000)

static long handle_clone_ret(long ret)
{
  if (ret != 0) {
    return ret;
  }
  usleep(USLEEP_FORKED_CHILD);
  syscall(__NR_exit, 0);
  while (1) {
  }
}

#define MAX_CLONE_ARGS_BYTES 256
static long syz_clone3(volatile long a0, volatile long a1)
{
  unsigned long copy_size = a1;
  if (copy_size < sizeof(uint64_t) || copy_size > MAX_CLONE_ARGS_BYTES)
    return -1;
  char clone_args[MAX_CLONE_ARGS_BYTES];
  memcpy(&clone_args, (void*)a0, copy_size);
  uint64_t* flags = (uint64_t*)&clone_args;
  *flags &= ~CLONE_VM;
  return handle_clone_ret((long)syscall(__NR_clone3, &clone_args, copy_size));
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  *(uint64_t*)0x20000a00 = 0x40b86000;
  *(uint64_t*)0x20000a08 = 0;
  *(uint64_t*)0x20000a10 = 0;
  *(uint64_t*)0x20000a18 = 0;
  *(uint32_t*)0x20000a20 = 0x1d;
  *(uint64_t*)0x20000a28 = 0;
  *(uint64_t*)0x20000a30 = 0;
  *(uint64_t*)0x20000a38 = 0;
  *(uint64_t*)0x20000a40 = 0;
  *(uint64_t*)0x20000a48 = 0;
  *(uint32_t*)0x20000a50 = -1;
  syz_clone3(/*args=*/0x20000a00, /*size=*/0x58);
  *(uint16_t*)0x20000040 = 1;
  *(uint64_t*)0x20000048 = 0x20000080;
  *(uint16_t*)0x20000080 = 6;
  *(uint8_t*)0x20000082 = 4;
  *(uint8_t*)0x20000083 = 0;
  *(uint32_t*)0x20000084 = 0x7fff0000;
  syscall(__NR_seccomp, /*op=*/1ul, /*flags=*/0ul, /*arg=*/0x20000040ul);
  syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0);
  syscall(__NR_prlimit64, /*pid=*/0, /*res=RLIMIT_RTPRIO*/ 0xeul, /*new=*/0ul,
          /*old=*/0ul);
  *(uint64_t*)0x20000a00 = 0x40b86000;
  *(uint64_t*)0x20000a08 = 0;
  *(uint64_t*)0x20000a10 = 0;
  *(uint64_t*)0x20000a18 = 0;
  *(uint32_t*)0x20000a20 = 0x1d;
  *(uint64_t*)0x20000a28 = 0;
  *(uint64_t*)0x20000a30 = 0;
  *(uint64_t*)0x20000a38 = 0;
  *(uint64_t*)0x20000a40 = 0;
  *(uint64_t*)0x20000a48 = 0;
  *(uint32_t*)0x20000a50 = -1;
  syz_clone3(/*args=*/0x20000a00, /*size=*/0x58);
  res = -1;
  res = syz_open_dev(/*dev=*/0xc, /*major=*/4, /*minor=*/0x14);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x5608, 0);
  res = -1;
  res = syz_open_dev(/*dev=*/0xc, /*major=*/4, /*minor=*/0x15);
  if (res != -1)
    r[1] = res;
  *(uint16_t*)0x20000080 = 0x3e7f;
  *(uint64_t*)0x20000088 = 0x20000040;
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x4b67, /*arg=*/0x20000080ul);
  return 0;
}
```

[  201.617435] ------------[ cut here ]------------
[  201.617808] WARNING: CPU: 3 PID: 2712  ipmrat
net/ipv4/ipmr.c:440_rules_exit.isra.0+0x10c/0x1a0
[  201.618094] Modules linked in:
[  201.618200] CPU: 3 UID: 0 PID: 2712 Comm: fused3844 Not tainted 6.13.0-rc1
#1
[  201.618423] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
[  201.618682] RIP: 0010:ipmr_rules_exit.isra.0+0x10c/0x1a0
[  201.618829] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 7d 48
c7 03 00 00 00 00 5b 5d 41 5c 41 5d c3 cc cc cc cc e8 55 32 b7 fd 90 <0f> 0b 90
eb 99 e8 4a 32 b7 fd 0f b6 2d a9 fa 30 02 40 80 fd 01 0f
[  201.619438] RSP: 0000:ffff88810f0ff910 EFLAGS: 00010293
[  201.619667] RAX: 0000000000000000 RBX: ffff8881161d3320 RCX:
ffffffff8594d6fb
[  201.619922] RDX: ffff888108342dc0 RSI: 0000000000000004 RDI:
ffff8881161d2e44
[  201.620162] RBP: ffff88810afea000 R08: 0000000000000000 R09:
ffffed1022c3a5c9
[  201.620439] R10: ffffed1022c3a5c8 R11: ffff8881161d2e47 R12:
ffff8881161d2e44
[  201.620750] R13: ffff8881161d2dc0 R14: dffffc0000000000 R15:
fffffbfff0f58434
[  201.621079] FS:  000000000fc74880(0000) GS:ffff8881f1180000(0000)
knlGS:0000000000000000
[  201.621429] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  201.621701] CR2: 000000000048b6b0 CR3: 0000000111808000 CR4:
00000000000006f0
[  201.621960] Call Trace:
[  201.622067]  <TASK>
[  201.622145]  ? __warn+0xea/0x2b0
[  201.622305]  ? ipmr_rules_exit.isra.0+0x10c/0x1a0
[  201.622502]  ? report_bug+0x2cb/0x430
[  201.622645]  ? ipmr_rules_exit.isra.0+0x10c/0x1a0
[  201.622819]  ? ipmr_rules_exit.isra.0+0x10d/0x1a0
[  201.623008]  ? handle_bug+0x9b/0x110
[  201.623137]  ? exc_invalid_op+0x25/0x70
[  201.623364]  ? asm_exc_invalid_op+0x1a/0x20
[  201.623556]  ? ipmr_rules_exit.isra.0+0x10b/0x1a0
[  201.623774]  ? ipmr_rules_exit.isra.0+0x10c/0x1a0
[  201.623969]  ipmr_net_exit_batch+0x54/0xa0
[  201.624129]  ? __pfx_ipmr_net_exit_batch+0x10/0x10
[  201.624318]  ? __pfx_ipmr_net_exit+0x10/0x10
[  201.624489]  ops_exit_list.isra.0+0x102/0x150
[  201.624631]  setup_net+0x432/0x740
[  201.624725]  ? __pfx_setup_net+0x10/0x10
[  201.624831]  ? __pfx_down_read_killable+0x10/0x10
[  201.624977]  ? __kmalloc_cache_noprof+0x120/0x320
[  201.625121]  copy_net_ns+0x247/0x3d0
[  201.625236]  create_new_namespaces+0x382/0xa20
[  201.625377]  copy_namespaces+0x1d5/0x2d0
[  201.625510]  copy_process+0x2715/0x67a0
[  201.625649]  ? alloc_file_pseudo+0x130/0x1e0
[  201.625835]  ? sock_alloc_file+0x53/0x1d0
[  201.626009]  ? __pfx_copy_process+0x10/0x10
[  201.626143]  ? _copy_from_user+0x5a/0xa0
[  201.626285]  ? copy_clone_args_from_user+0x3c5/0x680
[  201.626487]  kernel_clone+0xc6/0x7a0
[  201.626604]  ? __pfx_kernel_clone+0x10/0x10
[  201.626781]  ? percpu_counter_add_batch+0x106/0x250
[  201.626989]  __do_sys_clone3+0x181/0x1f0
[  201.627149]  ? __pfx___do_sys_clone3+0x10/0x10
[  201.627333]  ? __secure_computing+0x16c/0x2c0
[  201.627509]  do_syscall_64+0xaa/0x1b0
[  201.627640]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[  201.627815] RIP: 0033:0x44df9d
[  201.627926] Code: c3 e8 37 29 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89
f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
[  201.628542] RSP: 002b:00007ffdcf96c988 EFLAGS: 00000206 ORIG_RAX:
00000000000001b3
[  201.628845] RAX: ffffffffffffffda RBX: 0000000000400530 RCX:
000000000044df9d
[  201.629125] RDX: 0000000020000a00 RSI: 0000000000000058 RDI:
00007ffdcf96c9b0
[  201.629396] RBP: 00007ffdcf96cac0 R08: 0000000000000000 R09:
0000000000000058
[  201.629676] R10: 0000000000000000 R11: 0000000000000206 R12:
0000000000403380
[  201.629912] R13: 0000000000000000 R14: 00000000004c5018 R15:
0000000000000000
[  201.630159]  </TASK>
[  201.630274] ---[ end trace 0000000000000000 ]---

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