[alsa-devel] sound: out-of-bounds write in snd_rawmidi_kernel_write1
Dmitry Vyukov
dvyukov at google.com
Wed Feb 3 09:57:50 CET 2016
Hello,
The following program triggers an out-of-bounds write in
snd_rawmidi_kernel_write1 (run in parallel loop). It seems to try to
copy -1 bytes (aka 4GB) from user space into kernel smashing all on
its way.
==================================================================
BUG: KASAN: use-after-free in memset+0x1a/0x30 at addr ffff8800326e3cef
Write of size 4294950912 by task a.out/7292
=============================================================================
BUG kmalloc-4096 (Not tainted): kasan: bad access detected
-----------------------------------------------------------------------------
INFO: Allocated in open_substream+0x2ff/0x780 age=288 cpu=1 pid=7287
[< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470
[< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499
[< inline >] slab_alloc_node mm/slub.c:2562
[< inline >] slab_alloc mm/slub.c:2604
[< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621
[< inline >] kmalloc include/linux/slab.h:463
[< inline >] snd_rawmidi_runtime_create sound/core/rawmidi.c:127
[< none >] open_substream+0x2ff/0x780 sound/core/rawmidi.c:266
[< none >] rawmidi_open_priv+0x144/0x300 sound/core/rawmidi.c:312
[< none >] snd_rawmidi_open+0x3fb/0xa90 sound/core/rawmidi.c:416
[< none >] soundcore_open+0x30f/0x640 sound/sound_core.c:639
[< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388
[< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736
[< none >] vfs_open+0x17b/0x1f0 fs/open.c:853
[< inline >] do_last fs/namei.c:3254
[< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386
[< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421
[< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022
[< inline >] SYSC_open fs/open.c:1040
[< none >] SyS_open+0x2d/0x40 fs/open.c:1035
[< none >] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
Call Trace:
[<ffffffff817654b7>] __asan_storeN+0x127/0x1a0 mm/kasan/kasan.c:522
[<ffffffff8176582a>] memset+0x1a/0x30 mm/kasan/kasan.c:280
[<ffffffff82c15294>] copy_user_handle_tail+0xb4/0xd0
arch/x86/lib/usercopy_64.c:86
[< inline >] copy_from_user ./arch/x86/include/asm/uaccess.h:735
[<ffffffff852855da>] snd_rawmidi_kernel_write1+0x34a/0x760
sound/core/rawmidi.c:1250
[<ffffffff852878b3>] snd_rawmidi_write+0x543/0xb30 sound/core/rawmidi.c:1318
[<ffffffff817b8be1>] do_loop_readv_writev+0x141/0x1e0 fs/read_write.c:719
[<ffffffff817bcb38>] do_readv_writev+0x5f8/0x6e0 fs/read_write.c:849
[<ffffffff817bcd56>] vfs_writev+0x86/0xc0 fs/read_write.c:886
[< inline >] SYSC_writev fs/read_write.c:919
[<ffffffff817bfec1>] SyS_writev+0x111/0x2b0 fs/read_write.c:911
[<ffffffff86661376>] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
==================================================================
// autogenerated by syzkaller (http://github.com/google/syzkaller)
#include <pthread.h>
#include <stdint.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
long r[19];
int main()
{
memset(r, -1, sizeof(r));
r[0] = syscall(SYS_mmap, 0x20000000ul, 0x22000ul, 0x3ul, 0x32ul,
0xfffffffffffffffful, 0x0ul);
r[2] = syscall(SYS_open, "/dev/midi3", 0x2ul, 0, 0, 0);
*(uint64_t*)0x20013ffe = (uint64_t)0x20013f69;
*(uint64_t*)0x20014006 = (uint64_t)0x97;
*(uint64_t*)0x2001400e = (uint64_t)0x20003ffe;
*(uint64_t*)0x20014016 = (uint64_t)0x3;
*(uint64_t*)0x2001401e = (uint64_t)0x2001ef70;
*(uint64_t*)0x20014026 = (uint64_t)0x92;
*(uint64_t*)0x2001402e = (uint64_t)0x20014730;
*(uint64_t*)0x20014036 = (uint64_t)0x1;
*(uint64_t*)0x2001403e = (uint64_t)0x2001e000;
*(uint64_t*)0x20014046 = (uint64_t)0x1000;
memcpy((void*)0x20013f69,
"\x0e\x6f\xfe\xa4\xc8\xbf\xaa\x28\x69\x82\xe0\x8c\x45\xab\x90"
"\xb9\x6a\xeb\x50\x3d\x1a\x59\x59\x33\x0a\xa5\xb8\xfe\x83\x75"
"\x1f\xb5\x25\x76\x65\x53\xb6\xe7\xe2\xe7\xe3\xd7\x55\x36\xb6"
"\x59\x2f\xf8\x61\xda\xdb\x73\x32\x94\xb1\x0e\x17\x87\xad\x8f"
"\x73\x6c\xc7\xeb\x47\xa2\x65\x77\xfb\xfc\xec\x70\x5c\x9e\x01"
"\x78\xef\x1b\x69\xab\xef\x58\x13\x35\x99\xf0\x2b\x25\x99\xdb"
"\xba\x16\xa7\x43\xc5\x19\x32\x91\x13\x24\x15\xd1\x5e\xb0\x1a"
"\x5f\x63\xe2\xc3\x61\x9a\x79\x82\x57\x60\x21\x79\x6e\xf5\x21"
"\x74\x18\xcf\x8f\x73\x93\x70\x3a\xfe\xf8\xe3\xde\x6a\x85\x3b"
"\x5a\xfc\x0b\xfe\x02\x8f\x32\xe6\xc5\x14\x1c\x07\x24\xce\xcb"
"\x95",
151);
memcpy((void*)0x20003ffe, "\x3d\x07\x31", 3);
memcpy((void*)0x2001ef70,
"\x5c\x39\xe0\x3f\xe7\xdd\x08\xeb\x7c\xb0\xe7\x31\x09\xdf\x84"
"\x1a\xbb\x98\xe1\xc8\x08\x00\x3b\xe9\xef\x62\x4a\x18\x10\xff"
"\xa1\x7f\xa0\xd6\x81\x86\xed\xb5\x43\x33\x7c\xa6\x01\xb8\xfc"
"\xe1\xee\x43\x95\x05\xf1\x5d\xa6\xb4\xb1\x62\x74\x82\xc6\x8b"
"\x9f\xfb\x9b\xe8\x41\xee\x2e\x44\xc0\x20\x37\xca\xe5\x33\xf3"
"\xeb\x9e\x2e\x15\x56\xce\x26\x5e\x6c\xee\xca\x49\x00\xe6\xf2"
"\x21\xd4\x07\xf1\x00\xee\x21\x5a\xd5\x7a\x84\x4c\x3e\x7c\x8d"
"\xe5\xb5\x35\x57\x69\xe4\x18\x09\x5b\xa7\xdb\xe6\x2f\x56\x78"
"\x83\xa1\x0c\xdd\x07\x74\x32\xb2\x85\x75\xeb\x51\x5b\x22\xd1"
"\x57\x95\xcd\xc2\xc4\xf9\x2e\xd8\xce\x9a\x52",
146);
memcpy((void*)0x20014730, "\xc3", 1);
memcpy(
(void*)0x2001e000,
"\xff\x20\xcc\xa3\x99\x07\x76\x17\xc4\x29\xef\xa5\x6a\xef\x9c\x9b"
"\x58\x94\x16\xfc\x87\x60\xb1\x04\x16\x80\x1d\xcb\xfd\x8b\xd7\x9a"
"\x41\x87\xb2\xdf\xe8\xc3\x17\x50\xd6\x5a\x01\x06\xc7\xc5\xb1\xf3"
"\x56\x57\x81\xa8\x2c\x0b\x81\x67\x93\x59\xc1\xbb\xb5\x2d\x45\xc5"
"\x27\x05\x66\x0b\xfd\x28\x1e\xdb\x45\x89\x34\x0b\x03\xfe\x5f\xa7"
"\x47\xeb\xa1\xe0\xff\xe1\xdb\x12\xa7\x11\x37\xe0\x96\x53\xa2\x29"
"\x1d\x3c\x3c\xda\x8e\x97\xeb\x58\x64\x8d\xff\x13\x70\x08\x96\x28"
"\x32\x4e\xce\x4c\xb3\x17\x1c\x74\xa8\x8d\x7b\x78\x32\x4b\xcc\xf8"
"\xf7\xcb\x33\x5c\xd5\x6b\xa3\x2a\x9c\x7c\x41\x3e\x87\x92\xec\x22"
"\x44\x36\x28\x2d\x76\xde\x44\xa8\xef\x9d\x2c\xa2\xf2\xc5\x94\x2b"
"\x3a\x17\xa4\xd7\x82\x4e\xef\xee\x1a\x4a\x6b\x98\xd5\xe4\x40\xbc"
"\x5a\xe1\x76\x47\x17\x2b\x45\xb6\xb6\xa4\xeb\x5a\x54\x82\x6a\x98"
"\x14\xf0\x4e\x5a\x8c\x30\x6a\x0f\xcb\x0f\x1b\x62\x8c\x48\x54\x16"
"\xb8\x94\x28\xd0\xcc\x47\x4f\xb4\x01\x40\x3c\xb7\xed\xf0\x96\x2a"
"\x55\xb2\xac\xf6\xa2\xab\x93\x19\x3f\xf6\xf8\xad\x8f\xa3\x5a\x6f"
"\x15\x26\xa3\x25\xbb\x58\x6e\x02\x58\xfa\x3a\xcf\xd9\xf8\x17\xb9"
"\xa1\x4c\x45\x16\x45\xcb\x7a\x84\x37\x3a\xb4\x3a\xc6\x98\xa9\x5c"
"\xf4\x9e\xdb\xcf\xa9\xbb\xcc\xcb\x15\x36\x52\xb0\xcc\x3d\xd0\xfa"
"\xd6\xc0\xff\xf6\xb7\x0e\x80\x31\x8e\x76\xfc\xe9\xd8\xf6\xb4\xbc"
"\xfa\xec\x94\x13\x64\x9d\x13\x7e\x91\x9c\x10\x27\xda\xc8\xea\x9b"
"\xc2\x09\x58\x81\x9e\x44\xf2\xc3\xef\x94\x6d\x2f\xa9\xa5\x19\xd7"
"\x78\x61\x2e\xd3\x01\x8a\xc3\xac\x1b\xb9\xaa\x00\x12\xc5\x7e\x7f"
"\x7b\x34\x27\x4c\x38\x00\x9c\x57\xa6\xe2\x5a\x5a\xe6\x00\x01\x56"
"\xa2\xed\xa6\xcd\x95\x0b\xde\x5e\x09\x62\x61\x7c\x2b\x16\x13\xb4"
"\x04\xf8\x1a\x5b\x15\x9d\x62\xd5\xac\x4b\x5b\x35\x70\xd0\xe2\x26"
"\xf9\xc0\x7c\x73\xad\x9c\xd5\xef\x7b\x9f\x01\x8b\xb6\xb3\x85\xbf"
"\x34\xa2\x8c\xce\x8a\xaf\xe1\x5b\xdd\x7f\xa6\x23\x55\x8b\xa4\xa3"
"\x06\x2f\xf1\xa0\xd8\x2a\xcc\x9a\x94\x19\x22\xfe\x65\x69\x9b\xcb"
"\x6d\x6c\x1c\x38\x25\x82\x9b\xec\xe1\x75\xb4\xbe\xac\x21\x4b\xec"
"\xfd\x22\x76\xcb\x35\x4b\xaa\x5c\x3a\x7b\xaa\x6f\x3c\x68\xa7\xa5"
"\x3d\xa2\xd5\x25\x9a\xe4\x6f\x80\xc5\xb5\xcf\x76\x37\xd8\xd9\x25"
"\xe6\xc7\x26\x40\xdf\x1d\xd3\x41\xb2\x58\x69\xa7\x18\x57\xf8\x35"
"\x26\x70\x30\x08\x76\xed\x2b\x37\x2a\x54\x7d\xa5\x7a\x66\x8d\xbf"
"\x4a\x20\x3d\x1b\xd1\x28\x1e\x7e\xfe\xd3\xb1\x6c\x64\x87\x70\x27"
"\x9e\xcf\x07\xd9\x5a\x9e\xbb\xdb\x3b\xb2\xcb\x50\x78\x3c\x45\x76"
"\xec\x59\xa9\xca\xb2\x80\x8c\xc5\x62\x76\x8c\x76\x61\xb5\xf2\xcf"
"\x0f\x37\x7d\x44\x7f\xc3\x2c\xef\x7a\x07\x3b\xe2\xb9\x9b\x15\xc6"
"\xa6\xb5\xdf\x02\x12\x75\x7d\x8c\x09\x1a\x50\x91\x70\x46\xbb\x18"
"\xf7\x44\x05\xc8\xdb\x78\xa2\x87\xd6\x0a\x5f\x14\xf0\xaf\x61\xd7"
"\x14\x91\x31\xae\xad\xea\x05\xb3\xd7\xc3\xae\x57\xe5\xbe\x9a\x43"
"\xde\x55\xcc\x8e\x91\xac\x5c\xb5\xb9\x0a\x68\x28\x41\xdc\x09\x69"
"\x0b\x86\xa1\x46\x67\x96\x04\xf6\x2e\x6e\x07\x11\x62\xb5\x96\x09"
"\x2b\x5f\xcb\x7a\x9b\xcb\x77\x1b\x79\xb0\xab\x05\x89\x15\x5a\xcd"
"\xab\xd6\x82\x8c\xb0\x65\xc1\x88\x6c\x14\x60\x3d\x77\xf7\xb4\xc1"
"\xdf\x43\x0a\x80\x37\xc4\x82\x31\x27\x93\x2d\x93\x06\xfb\x92\xce"
"\x19\x3b\xb8\xcf\x4f\x42\xf6\x44\x7a\x5d\xed\xe7\x09\x79\x19\x42"
"\xb8\x30\x7e\x4b\x36\xd9\x75\x46\xd8\x7b\xba\x32\x01\x29\x8b\xec"
"\xdb\x66\xcf\x4b\x04\xde\x8d\x5e\x1d\xf1\x58\xc1\x3b\xcb\x04\x13"
"\x3d\x8a\x9e\xa8\x8f\xce\x0c\xed\x8c\x1e\xf0\x3e\x8c\x59\x14\x53"
"\x17\x9d\xb8\x47\x33\xbc\xa3\xe2\xdc\x16\xaf\xd2\x28\xe4\xfe\xa1"
"\xaf\x98\x7a\xc9\x4b\x3b\x38\xea\x8e\x1a\x36\x3d\xb4\xb8\x9d\x28"
"\xbc\xc6\x9f\xd4\x21\xa9\x52\xbd\x1c\x77\x69\xb8\x41\x0e\x66\x9a"
"\x29\x99\x50\x4c\x76\x46\x99\xcc\xbc\x5a\x23\x1c\x19\xbb\x25\x07"
"\xf5\xb3\x5c\x38\x9d\xed\xc5\x85\xea\xb4\xd6\x14\xdb\xd1\x54\xb7"
"\x13\xec\xcb\x24\xce\x8c\xf9\xb5\xc7\xbe\x54\x17\x29\x19\xa2\xaf"
"\xb6\xd3\x14\xae\x83\xa7\x43\xb7\xbe\x28\xba\x2c\x52\xc0\xaa\x37"
"\x98\x14\x87\xe9\xbd\x2e\x1c\x93\x29\xd4\xad\x87\x4e\x9a\x7b\x94"
"\x30\x72\x68\x31\x2c\xa5\x2b\xed\x52\xc9\x31\x43\xf1\x2c\x77\xcb"
"\x73\x64\x07\x3f\x8a\x59\x59\xf3\x8a\x9c\x9e\xb0\xb6\x7b\x8d\x0e"
"\x6b\x5a\x33\xcd\x04\x5e\x77\x93\xd4\x23\xb0\xbe\xca\x08\x95\xd6"
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"\x8e\x68\x34\x5a\xfb\xe5\x39\x6a\xde\xc4\x15\xae\x4c\xe0\x6e\x0b"
"\x42\x2f\x2a\x77\xd3\x5b\x69\xa0\x07\xaf\x1c\x55\xa8\x28\x24\x81"
"\xc0\x34\xd5\xde\xca\xcf\xa9\x85\x58\x90\xd4\x5b\xf3\x73\xd1\xfb"
"\xc4\x25\x64\xb0\x15\xf6\x98\x73\x65\x38\x89\x72\xa6\x5b\x5e\xdb"
"\xca\x92\xeb\x39\xb9\x90\x29\x18\x72\xeb\xee\xa0\x90\x1a\x34\x4c"
"\x62\x4f\xd9\x2f\x69\x49\x88\x4c\x24\x26\x02\x3b\x74\x12\xf1\x4c"
"\x78\x25\xbb\xd3\x26\xc9\x25\xf0\xda\x68\x5a\x50\x7b\x69\x90\x9e"
"\xd7\x50\x07\x9d\x4d\xec\x0b\xf8\x88\x78\x2b\xb9\x9e\x9a\x41\x40"
"\x7f\xbe\xad\x6f\x4d\x3e\x83\x7f\x6a\x89\x79\x32\x68\x97\x37\x96"
"\x90\x41\xde\x3a\x69\x49\xf3\x7e\x0a\xb6\x4a\x0f\x3c\x41\x69\x8a"
"\xcb\xad\xb7\xe7\xf4\x59\x95\xa5\xf4\x8d\xac\xeb\xdf\x07\xf3\x1e"
"\x81\x52\x66\x19\xb4\x07\xe6\x63\x0e\xda\x2d\x0e\xf6\x72\x94\x84"
"\x53\x70\x22\x0e\x46\xa6\xe5\x4e\x9d\x34\x38\xa1\x6d\x2b\xdf\xa9"
"\x67\x33\x81\xcf\xa5\x92\xff\x94\x2b\x19\x1f\x55\x05\xd8\xbc\x2d"
"\xab\x7b\x15\xa2\x4c\xe7\xcb\xdb\x96\xfc\xb2\x51\x34\xb4\x84\xba"
"\x1d\x68\x7a\xff\x64\x71\xa8\x46\x12\x97\xe6\xf5\x14\x4e\xf5\xcb"
"\x72\xce\xaf\x3e\xf7\x60\x27\x42\xa0\x92\xdf\x90\x86\x40\x55\x94"
"\x95\x11\xf4\xe4\xbf\xbc\x6e\xa6\x7f\x3f\x01\x8c\xa6\x01\xa2\x4e"
"\x4e\x4d\xaf\x62\x3b\x55\x8d\x91\x34\x35\x43\x23\x51\x3b\xf6\x3e"
"\xbd\x79\x04\x25\x20\xc1\x13\x23\xe2\x46\x78\xde\xd5\x0d\xb6\x89"
"\x2c\x43\x71\x9a\x89\x8a\x3c\x70\xee\x20\x6b\x8b\x9c\x31\x48\x3a"
"\x41\x9a\xde\xf0\x18\x46\xee\x47\x09\xcb\xad\x2a\x6b\x95\x2d\x72"
"\xd7\x01\xf8\x68\xfe\x75\x37\x15\x6a\x15\x65\x8e\x95\x88\x66\x08"
"\xea\x31\x6d\xee\x8f\xc9\xac\x01\x06\x89\x3a\x82\x35\x79\x0a\x40"
"\x37\x51\x1a\x53\xd9\x85\xd6\x99\x12\xbf\xb6\xe0\x72\x3c\xc2\xfe"
"\x07\x1e\x92\xce\x18\x9f\xfb\xa0\xf6\xd3\x42\xbb\x41\xce\x31\x61"
"\x2f\xe1\x8d\x55\x80\x03\x16\xb0\xd9\x2d\xd3\x64\xca\x62\x49\x5f"
"\x3e\x28\xe6\x54\xd5\xb9\xdf\x7f\x5a\xcb\xa2\x87\xbc\x34\xbe\x06"
"\x0a\x4c\x77\x34\xa6\xae\xbd\xad\x22\x62\xf2\x56\x28\x99\x21\x4b"
"\x58\x68\x1f\xa5\xb6\x89\x5e\xa4\x76\x58\x60\x8a\x61\x17\x63\x77"
"\xbd\xef\x1c\x3e\xfd\xc2\x26\x29\x69\xd9\xa0\x6e\xef\x81\x6d\xec"
"\xa0\x14\xac\x42\x47\x77\xd5\x1e\xa5\xc7\x40\xa3\x7e\xac\x80\xf7"
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"\x42\x01\xe9\x35\x58\xf7\x55\x13\x80\x24\x23\x30\x62\x6c\x7b\x86"
"\xff\x7e\x12\x34\xf3\x33\x4c\x1c\xed\x5a\x96\xd6\xcd\x04\xfb\xf9"
"\x7c\xde\xc0\xd5\x70\x52\x4e\x0f\xa2\x8e\x6b\xa6\x8f\x3a\x08\xf9"
"\x08\x0f\x2f\xd7\xa2\xb1\x91\x53\x65\x63\x63\xb8\x31\xba\xf4\x21"
"\xb5\x17\xd7\x59\x94\xd0\x0e\x8c\x91\x5c\x37\xf8\x3a\xd8\x8c\x7f"
"\x76\xd0\x63\x7a\xd9\xb4\xa6\x3d\xf8\xfb\x72\xd5\x65\xf0\x10\x4a"
"\x42\x15\x70\xb1\x9b\x5f\xf8\xf9\x9f\x5b\x29\x0a\x28\x2a\x68\x6b"
"\xaf\xec\x84\x94\xbc\x22\xdf\xe8\x3e\xcb\xee\xc3\xc8\x03\x00\xf3"
"\x02\xff\x07\x4d\x95\x62\x12\x9e\x51\x1a\x20\x4a\x5a\xa2\x66\x81"
"\x3d\x29\x98\x23\x17\x11\x95\x84\x51\x9f\x40\x7a\x3d\x6f\x61\xbe"
"\x2b\x1b\x03\x82\xad\xb6\x8f\x69\x3d\x31\x39\xc7\x8b\x0a\x77\x6e"
"\x02\x88\xdd\x13\x6a\x9c\x72\x46\x5d\xf0\x92\xb4\x76\xac\xc0\xbd"
"\x8d\x2e\x3c\xcb\xa3\x89\x31\x07\x36\x68\x35\x03\x4c\x95\x6d"
"\xbd",
4096);
r[18] = syscall(SYS_writev, r[2], 0x20013ffeul, 0x5ul, 0, 0, 0);
return 0;
}
On commit 34229b277480f46c1e9a19f027f30b074512e68b.
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