Dear Linux kernel developers and maintainers:
We are writing to report a slab-out-of-bounds bug discovered in the
hfsplus subsystem with our modified syzkaller. This bug is
reproducible on the latest version (v6.17-rc6, commit
f83ec76bf285bea5727f478a68b894f5543ca76e).
The kernel console output, kernel config, syzkaller reproducer, and C
reproducer are attached to this email to help analysis. The KASAN
report from v6.17-rc6, formatted by syz-symbolize, is listed below:
hfsplus: invalid length 63743 has been corrected to 255
==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_strcasecmp+0x1bc/0x490
fs/hfsplus/unicode.c:47
Read of size 2 at addr ffff88804b8d640c by task repro.out/9757
CPU: 1 UID: 0 PID: 9757 Comm: repro.out Not tainted 6.17.0-rc6 #1 PREEMPT(full)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x17e/0x810 mm/kasan/report.c:482
kasan_report+0x147/0x180 mm/kasan/report.c:595
hfsplus_strcasecmp+0x1bc/0x490 fs/hfsplus/unicode.c:47
hfs_find_rec_by_key+0xa6/0x1e0 fs/hfsplus/bfind.c:89
__hfsplus_brec_find+0x18b/0x480 fs/hfsplus/bfind.c:124
hfsplus_brec_find+0x289/0x500 fs/hfsplus/bfind.c:184
hfsplus_brec_read+0x2b/0x120 fs/hfsplus/bfind.c:211
hfsplus_lookup+0x2aa/0x890 fs/hfsplus/dir.c:52
__lookup_slow+0x294/0x3d0 fs/namei.c:1808
lookup_slow+0x53/0x70 fs/namei.c:1825
walk_component+0x2d4/0x400 fs/namei.c:2129
lookup_last fs/namei.c:2630 [inline]
path_lookupat+0x163/0x430 fs/namei.c:2654
filename_lookup+0x212/0x570 fs/namei.c:2683
user_path_at+0x3a/0x60 fs/namei.c:3127
ksys_umount fs/namespace.c:2112 [inline]
__do_sys_umount fs/namespace.c:2120 [inline]
__se_sys_umount fs/namespace.c:2118 [inline]
__x64_sys_umount+0xee/0x160 fs/namespace.c:2118
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x452627
Code: 06 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66
2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc5dd08ae8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000452627
RDX: 0000000000000009 RSI: 0000000000000009 RDI: 00007ffc5dd08b90
RBP: 00007ffc5dd09bd0 R08: 0000000000000015 R09: 00007ffc5dd08980
R10: 00000000004b9560 R11: 0000000000000206 R12: 000000000040a070
R13: 0000000000000000 R14: 00000000004bc018 R15: 00000000004004a0
</TASK>
Allocated by task 9757:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4376 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4388
kmalloc_noprof include/linux/slab.h:909 [inline]
hfsplus_find_init+0x8c/0x1d0 fs/hfsplus/bfind.c:21
hfsplus_lookup+0x19c/0x890 fs/hfsplus/dir.c:44
__lookup_slow+0x294/0x3d0 fs/namei.c:1808
lookup_slow+0x53/0x70 fs/namei.c:1825
walk_component+0x2d4/0x400 fs/namei.c:2129
lookup_last fs/namei.c:2630 [inline]
path_lookupat+0x163/0x430 fs/namei.c:2654
filename_lookup+0x212/0x570 fs/namei.c:2683
user_path_at+0x3a/0x60 fs/namei.c:3127
ksys_umount fs/namespace.c:2112 [inline]
__do_sys_umount fs/namespace.c:2120 [inline]
__se_sys_umount fs/namespace.c:2118 [inline]
__x64_sys_umount+0xee/0x160 fs/namespace.c:2118
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88804b8d6000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
allocated 1036-byte region [ffff88804b8d6000, ffff88804b8d640c)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4b8d0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801a442000 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 04fff00000000040 ffff88801a442000 0000000000000000 dead000000000001
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 04fff00000000003 ffffea00012e3401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask
0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC),
pid 8133, tgid 8133 (sh), ts 23500816499, free_ts 23484371257
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2660
new_slab mm/slub.c:2714 [inline]
___slab_alloc+0xbeb/0x1420 mm/slub.c:3901
__slab_alloc mm/slub.c:3992 [inline]
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
__do_kmalloc_node mm/slub.c:4375 [inline]
__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4388
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
tomoyo_init_log+0x1a32/0x1f30 security/tomoyo/audit.c:275
tomoyo_supervisor+0x340/0x1490 security/tomoyo/common.c:2198
tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline]
tomoyo_env_perm+0x149/0x1e0 security/tomoyo/environ.c:63
tomoyo_environ security/tomoyo/domain.c:672 [inline]
tomoyo_find_next_domain+0x15cf/0x1aa0 security/tomoyo/domain.c:888
tomoyo_bprm_check_security+0x11c/0x180 security/tomoyo/tomoyo.c:102
security_bprm_check+0x89/0x270 security/security.c:1302
search_binary_handler fs/exec.c:1660 [inline]
exec_binprm fs/exec.c:1702 [inline]
bprm_execve+0x8ee/0x1450 fs/exec.c:1754
do_execveat_common+0x521/0x6b0 fs/exec.c:1860
do_execve fs/exec.c:1934 [inline]
__do_sys_execve fs/exec.c:2010 [inline]
__se_sys_execve fs/exec.c:2005 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2005
page last free pid 5289 tgid 5289 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc0/0xd40 mm/page_alloc.c:2895
discard_slab mm/slub.c:2758 [inline]
__put_partials+0x156/0x1a0 mm/slub.c:3223
put_cpu_partial+0x17c/0x250 mm/slub.c:3298
__slab_free+0x2d5/0x3c0 mm/slub.c:4565
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4191 [inline]
slab_alloc_node mm/slub.c:4240 [inline]
kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4292
__alloc_skb+0x12a/0x2f0 net/core/skbuff.c:659
netlink_sendmsg+0x5c6/0xb30 net/netlink/af_netlink.c:1871
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:729
____sys_sendmsg+0x507/0x840 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88804b8d6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88804b8d6380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804b8d6400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88804b8d6480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804b8d6500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Please let me know if any further information is required.
Best Regards,
Jiaming Zhang.
// autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include <dirent.h> #include <endian.h> #include <errno.h> #include <fcntl.h> #include <sched.h> #include <setjmp.h> #include <signal.h> #include <stdarg.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/mount.h> #include <sys/prctl.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> #include <unistd.h> #include <linux/loop.h> #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif static unsigned long long procid; 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 use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } //% This code is derived from puff.{c,h}, found in the zlib development. The //% original files come with the following copyright notice: //% Copyright (C) 2002-2013 Mark Adler, all rights reserved //% version 2.3, 21 Jan 2013 //% This software is provided 'as-is', without any express or implied //% warranty. In no event will the author be held liable for any damages //% arising from the use of this software. //% Permission is granted to anyone to use this software for any purpose, //% including commercial applications, and to alter it and redistribute it //% freely, subject to the following restrictions: //% 1. The origin of this software must not be misrepresented; you must not //% claim that you wrote the original software. If you use this software //% in a product, an acknowledgment in the product documentation would be //% appreciated but is not required. //% 2. Altered source versions must be plainly marked as such, and must not be //% misrepresented as being the original software. //% 3. This notice may not be removed or altered from any source distribution. //% Mark Adler madler@xxxxxxxxxxxxxxxxxx //% BEGIN CODE DERIVED FROM puff.{c,h} #define MAXBITS 15 #define MAXLCODES 286 #define MAXDCODES 30 #define MAXCODES (MAXLCODES + MAXDCODES) #define FIXLCODES 288 struct puff_state { unsigned char* out; unsigned long outlen; unsigned long outcnt; const unsigned char* in; unsigned long inlen; unsigned long incnt; int bitbuf; int bitcnt; jmp_buf env; }; static int puff_bits(struct puff_state* s, int need) { long val = s->bitbuf; while (s->bitcnt < need) { if (s->incnt == s->inlen) longjmp(s->env, 1); val |= (long)(s->in[s->incnt++]) << s->bitcnt; s->bitcnt += 8; } s->bitbuf = (int)(val >> need); s->bitcnt -= need; return (int)(val & ((1L << need) - 1)); } static int puff_stored(struct puff_state* s) { s->bitbuf = 0; s->bitcnt = 0; if (s->incnt + 4 > s->inlen) return 2; unsigned len = s->in[s->incnt++]; len |= s->in[s->incnt++] << 8; if (s->in[s->incnt++] != (~len & 0xff) || s->in[s->incnt++] != ((~len >> 8) & 0xff)) return -2; if (s->incnt + len > s->inlen) return 2; if (s->outcnt + len > s->outlen) return 1; for (; len--; s->outcnt++, s->incnt++) { if (s->in[s->incnt]) s->out[s->outcnt] = s->in[s->incnt]; } return 0; } struct puff_huffman { short* count; short* symbol; }; static int puff_decode(struct puff_state* s, const struct puff_huffman* h) { int first = 0; int index = 0; int bitbuf = s->bitbuf; int left = s->bitcnt; int code = first = index = 0; int len = 1; short* next = h->count + 1; while (1) { while (left--) { code |= bitbuf & 1; bitbuf >>= 1; int count = *next++; if (code - count < first) { s->bitbuf = bitbuf; s->bitcnt = (s->bitcnt - len) & 7; return h->symbol[index + (code - first)]; } index += count; first += count; first <<= 1; code <<= 1; len++; } left = (MAXBITS + 1) - len; if (left == 0) break; if (s->incnt == s->inlen) longjmp(s->env, 1); bitbuf = s->in[s->incnt++]; if (left > 8) left = 8; } return -10; } static int puff_construct(struct puff_huffman* h, const short* length, int n) { int len; for (len = 0; len <= MAXBITS; len++) h->count[len] = 0; int symbol; for (symbol = 0; symbol < n; symbol++) (h->count[length[symbol]])++; if (h->count[0] == n) return 0; int left = 1; for (len = 1; len <= MAXBITS; len++) { left <<= 1; left -= h->count[len]; if (left < 0) return left; } short offs[MAXBITS + 1]; offs[1] = 0; for (len = 1; len < MAXBITS; len++) offs[len + 1] = offs[len] + h->count[len]; for (symbol = 0; symbol < n; symbol++) if (length[symbol] != 0) h->symbol[offs[length[symbol]]++] = symbol; return left; } static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode, const struct puff_huffman* distcode) { static const short lens[29] = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258}; static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0}; static const short dists[30] = { 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; static const short dext[30] = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; int symbol; do { symbol = puff_decode(s, lencode); if (symbol < 0) return symbol; if (symbol < 256) { if (s->outcnt == s->outlen) return 1; if (symbol) s->out[s->outcnt] = symbol; s->outcnt++; } else if (symbol > 256) { symbol -= 257; if (symbol >= 29) return -10; int len = lens[symbol] + puff_bits(s, lext[symbol]); symbol = puff_decode(s, distcode); if (symbol < 0) return symbol; unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]); if (dist > s->outcnt) return -11; if (s->outcnt + len > s->outlen) return 1; while (len--) { if (dist <= s->outcnt && s->out[s->outcnt - dist]) s->out[s->outcnt] = s->out[s->outcnt - dist]; s->outcnt++; } } } while (symbol != 256); return 0; } static int puff_fixed(struct puff_state* s) { static int virgin = 1; static short lencnt[MAXBITS + 1], lensym[FIXLCODES]; static short distcnt[MAXBITS + 1], distsym[MAXDCODES]; static struct puff_huffman lencode, distcode; if (virgin) { lencode.count = lencnt; lencode.symbol = lensym; distcode.count = distcnt; distcode.symbol = distsym; short lengths[FIXLCODES]; int symbol; for (symbol = 0; symbol < 144; symbol++) lengths[symbol] = 8; for (; symbol < 256; symbol++) lengths[symbol] = 9; for (; symbol < 280; symbol++) lengths[symbol] = 7; for (; symbol < FIXLCODES; symbol++) lengths[symbol] = 8; puff_construct(&lencode, lengths, FIXLCODES); for (symbol = 0; symbol < MAXDCODES; symbol++) lengths[symbol] = 5; puff_construct(&distcode, lengths, MAXDCODES); virgin = 0; } return puff_codes(s, &lencode, &distcode); } static int puff_dynamic(struct puff_state* s) { static const short order[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; int nlen = puff_bits(s, 5) + 257; int ndist = puff_bits(s, 5) + 1; int ncode = puff_bits(s, 4) + 4; if (nlen > MAXLCODES || ndist > MAXDCODES) return -3; short lengths[MAXCODES]; int index; for (index = 0; index < ncode; index++) lengths[order[index]] = puff_bits(s, 3); for (; index < 19; index++) lengths[order[index]] = 0; short lencnt[MAXBITS + 1], lensym[MAXLCODES]; struct puff_huffman lencode = {lencnt, lensym}; int err = puff_construct(&lencode, lengths, 19); if (err != 0) return -4; index = 0; while (index < nlen + ndist) { int symbol; int len; symbol = puff_decode(s, &lencode); if (symbol < 0) return symbol; if (symbol < 16) lengths[index++] = symbol; else { len = 0; if (symbol == 16) { if (index == 0) return -5; len = lengths[index - 1]; symbol = 3 + puff_bits(s, 2); } else if (symbol == 17) symbol = 3 + puff_bits(s, 3); else symbol = 11 + puff_bits(s, 7); if (index + symbol > nlen + ndist) return -6; while (symbol--) lengths[index++] = len; } } if (lengths[256] == 0) return -9; err = puff_construct(&lencode, lengths, nlen); if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1])) return -7; short distcnt[MAXBITS + 1], distsym[MAXDCODES]; struct puff_huffman distcode = {distcnt, distsym}; err = puff_construct(&distcode, lengths + nlen, ndist); if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1])) return -8; return puff_codes(s, &lencode, &distcode); } static int puff(unsigned char* dest, unsigned long* destlen, const unsigned char* source, unsigned long sourcelen) { struct puff_state s = { .out = dest, .outlen = *destlen, .outcnt = 0, .in = source, .inlen = sourcelen, .incnt = 0, .bitbuf = 0, .bitcnt = 0, }; int err; if (setjmp(s.env) != 0) err = 2; else { int last; do { last = puff_bits(&s, 1); int type = puff_bits(&s, 2); err = type == 0 ? puff_stored(&s) : (type == 1 ? puff_fixed(&s) : (type == 2 ? puff_dynamic(&s) : -1)); if (err != 0) break; } while (!last); } *destlen = s.outcnt; return err; } //% END CODE DERIVED FROM puff.{c,h} #define ZLIB_HEADER_WIDTH 2 static int puff_zlib_to_file(const unsigned char* source, unsigned long sourcelen, int dest_fd) { if (sourcelen < ZLIB_HEADER_WIDTH) return 0; source += ZLIB_HEADER_WIDTH; sourcelen -= ZLIB_HEADER_WIDTH; const unsigned long max_destlen = 132 << 20; void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0); if (ret == MAP_FAILED) return -1; unsigned char* dest = (unsigned char*)ret; unsigned long destlen = max_destlen; int err = puff(dest, &destlen, source, sourcelen); if (err) { munmap(dest, max_destlen); errno = -err; return -1; } if (write(dest_fd, dest, destlen) != (ssize_t)destlen) { munmap(dest, max_destlen); return -1; } return munmap(dest, max_destlen); } static int setup_loop_device(unsigned char* data, unsigned long size, const char* loopname, int* loopfd_p) { int err = 0, loopfd = -1; int memfd = syscall(__NR_memfd_create, "syzkaller", 0); if (memfd == -1) { err = errno; goto error; } if (puff_zlib_to_file(data, size, memfd)) { err = errno; goto error_close_memfd; } loopfd = open(loopname, O_RDWR); if (loopfd == -1) { err = errno; goto error_close_memfd; } if (ioctl(loopfd, LOOP_SET_FD, memfd)) { if (errno != EBUSY) { err = errno; goto error_close_loop; } ioctl(loopfd, LOOP_CLR_FD, 0); usleep(1000); if (ioctl(loopfd, LOOP_SET_FD, memfd)) { err = errno; goto error_close_loop; } } close(memfd); *loopfd_p = loopfd; return 0; error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return -1; } static void reset_loop_device(const char* loopname) { int loopfd = open(loopname, O_RDWR); if (loopfd == -1) { return; } if (ioctl(loopfd, LOOP_CLR_FD, 0)) { } close(loopfd); } static long syz_mount_image(volatile long fsarg, volatile long dir, volatile long flags, volatile long optsarg, volatile long change_dir, volatile unsigned long size, volatile long image) { unsigned char* data = (unsigned char*)image; int res = -1, err = 0, need_loop_device = !!size; char* mount_opts = (char*)optsarg; char* target = (char*)dir; char* fs = (char*)fsarg; char* source = NULL; char loopname[64]; if (need_loop_device) { int loopfd; memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(data, size, loopname, &loopfd) == -1) return -1; close(loopfd); source = loopname; } mkdir(target, 0777); char opts[256]; memset(opts, 0, sizeof(opts)); if (strlen(mount_opts) > (sizeof(opts) - 32)) { } strncpy(opts, mount_opts, sizeof(opts) - 32); if (strcmp(fs, "iso9660") == 0) { flags |= MS_RDONLY; } else if (strncmp(fs, "ext", 3) == 0) { bool has_remount_ro = false; char* remount_ro_start = strstr(opts, "errors=remount-ro"); if (remount_ro_start != NULL) { char after = *(remount_ro_start + strlen("errors=remount-ro")); char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1); has_remount_ro = ((before == '\0' || before == ',') && (after == '\0' || after == ',')); } if (strstr(opts, "errors=panic") || !has_remount_ro) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } res = mount(source, target, fs, flags, opts); if (res == -1) { err = errno; goto error_clear_loop; } res = open(target, O_RDONLY | O_DIRECTORY); if (res == -1) { err = errno; goto error_clear_loop; } if (change_dir) { res = chdir(target); if (res == -1) { err = errno; } } error_clear_loop: if (need_loop_device) reset_loop_device(loopname); errno = err; return res; } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { int iter = 0; DIR* dp = 0; const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW; retry: while (umount2(dir, umount_flags) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } struct dirent* ep = 0; while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, umount_flags) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, umount_flags)) exit(1); } } closedir(dp); for (int i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, umount_flags)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } exit(1); } } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void reset_loop() { char buf[64]; snprintf(buf, sizeof(buf), "/dev/loop%llu", procid); int loopfd = open(buf, O_RDWR); if (loopfd != -1) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); if (symlink("/dev/binderfs", "./binderfs")) { } } #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) { } } static long syz_clone(volatile long flags, volatile long stack, volatile long stack_len, volatile long ptid, volatile long ctid, volatile long tls) { long sp = (stack + stack_len) & ~15; long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls); return handle_clone_ret(ret); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); reset_loop(); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } remove_dir(cwdbuf); } } void execute_one(void) { if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x20000600, "hfsplus\000", 8); memcpy((void*)0x20000640, "./file0\000", 8); *(uint8_t*)0x20000040 = 0; memcpy( (void*)0x20000e00, "\x78\x9c\xec\xdd\x4f\x6f\x1c\x67\x1d\x07\xf0\xef\x6e\x9c\x8d\x6d\xd4\x74" "\x93\x26\x6d\xa0\x95\xb0\x8a\x04\x08\x8b\xc4\xde\x45\x25\x41\x55\x81\x52" "\x90\x85\x2a\xd4\x8a\x57\x60\x11\xa7\xb1\xb2\x49\x2b\x7b\x8b\xdc\x1e\x90" "\x41\x9c\xfb\x1a\xca\xc1\x52\xcf\x88\x2b\x52\xa5\x72\x86\x57\x80\x8c\x7a" "\x44\xe2\x6e\x4e\xae\x66\x76\xf6\x4f\xec\xad\xe3\xd4\xae\x77\xd3\x7e\x3e" "\xd2\xec\xf3\x3c\xf3\xcc\x3c\xf3\x9b\xdf\xfc\xc9\x8c\x57\xd1\x06\xf8\xda" "\x5a\x59\xcc\xcc\x76\x6a\x59\x59\x7c\x7d\xab\x68\xef\xee\xb4\x3b\xbb\x3b" "\xed\xfb\xfd\x7a\x92\x0b\x49\xea\xc9\x6c\x92\x5a\x31\xfb\x6f\x49\x3e\x4d" "\xb6\xd3\x9b\xf2\xcd\x7e\xc7\x48\x79\xc8\x9b\x2f\x3f\xf5\xd1\x07\xcf\x7f" "\xf2\x4a\xaf\x35\x5b\x4d\xe5\xf2\xb5\xa3\xd6\x3b\x9e\x41\x2c\xcd\x5e\xac" "\x65\x79\x5a\xe3\xb5\x4e\x3c\xde\x70\x0f\x17\x92\x5c\xae\x4a\x98\xb8\xfd" "\xbe\xff\x8c\xed\x3e\xe1\x75\x09\x00\x4c\xb3\x5a\x72\x6e\xdc\xfc\x66\x32" "\x5f\x3d\xac\x17\xef\x01\xbd\xa7\xe2\xde\x33\xf6\x13\x6d\x7b\xd2\x01\x00" "\x00\x00\xc0\x19\x78\x7a\x2f\x7b\xd9\xca\xc5\x49\xc7\x01\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x4f\x92\xea\xf7\xff\x6b\xd5\x54\xef\xd7\x17\x52\xeb" "\xff\xfe\x7f\xa3\x9a\x97\xaa\xfe\x44\xfb\x78\xd2\x01\x00\x00\x00\x00\x00" "\x00\x00\xc0\x29\xf8\xf6\x5e\xf6\xb2\x95\x8b\xfd\xf6\x7e\xad\xfc\xce\xff" "\xc5\xb2\x71\xa5\xfc\xfc\x46\xde\xcd\x66\xd6\xb2\x91\xeb\xd9\xca\x6a\xba" "\xe9\x66\x23\xcb\x49\x9a\x23\x03\x35\xb6\x56\xbb\xdd\x8d\xe5\x63\xac\xd9" "\x1a\xbb\x66\xeb\x6c\xf6\x17\x00\x00\x00\x00\x00\x00\x00\xbe\xa2\xfe\x94" "\x95\xe1\xf7\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x0d\x6a" "\xc9\xb9\x5e\x51\x4e\x57\xfa\xf5\x66\xea\x33\x49\x66\x93\x34\x8a\xe5\xb6" "\x93\x7f\xf5\xeb\x53\xad\x7e\x74\xf7\xc7\x67\x15\x07\x00\x00\x00\x4c\xd0" "\xd3\x7b\xd9\xcb\x56\x2e\xf6\xdb\xfb\xb5\xf2\x9d\xff\xd9\xf2\xbd\x7f\x36" "\xef\xe6\x41\xba\x59\x4f\x37\x9d\xac\xe5\x76\xf9\xb7\x80\xde\x5b\x7f\x7d" "\x77\xa7\xdd\xd9\xdd\x69\xdf\x2f\xa6\xc3\xe3\xfe\xfc\x7f\x8f\x15\x46\xa3" "\x7a\x53\x3f\x57\xb6\xc6\x6d\xf9\x5a\xb9\xc4\x5c\xee\x64\xbd\x9c\x73\x3d" "\xbf\xcb\xdb\xe9\xe4\x76\xea\x83\x77\xfc\x6b\xfd\x78\xc6\xc7\xf5\xc7\x22" "\xa6\xda\x4f\x2b\xc7\x8c\xec\x76\x55\x16\x7b\xfe\xeb\xaa\x9c\x0e\xcd\x32" "\x23\xe7\x07\x19\x59\xaa\x62\x2b\xb2\x71\xe9\xe8\x4c\x3c\xe6\xd1\x39\xb8" "\xa5\xe5\xd4\x07\x7f\xf9\xb9\xf2\x25\xe4\x7c\xbe\x2a\x8b\xfd\x79\x6d\xaa" "\x73\xde\x1a\x39\xfb\x9e\x3d\x3a\x13\xc9\xfc\xbf\xdb\xff\xbf\xdb\x79\x70" "\xef\xee\x9d\xcd\xc5\xe9\xd9\xa5\x2f\xe8\x60\x26\xda\x23\x99\x78\xee\x6b" "\x95\x89\xa5\x22\x13\x7b\xfb\x3d\x49\x56\xf2\xab\xfc\x36\x8b\x59\xc8\x1b" "\xd9\xc8\x7a\x7e\x9f\xd5\x74\xb3\x96\x85\xbc\x56\xd6\x56\xab\xf3\xb9\xf8" "\x6c\x1e\x9d\xa9\x9f\x3d\xd4\x7a\xe3\x51\x91\x34\xaa\xe3\xd2\xbb\x8b\xd6" "\x73\x75\xd0\xf3\xe8\x98\x5e\x2c\xd7\xbd\x98\xf5\xfc\x26\x6f\xe7\x76\x79" "\x95\xdf\x4c\x2b\xad\xbc\x94\x9b\xb9\x95\x56\x79\xd5\xf7\x8f\xf0\xd5\x63" "\x5c\xf5\xf5\xc7\xbb\xea\xbf\xf3\xfd\xaa\x72\x3e\xc9\x2f\xab\x72\x3a\x14" "\x79\xbd\x34\x92\xd7\xd1\x7b\x6e\xb3\xec\x1b\x9d\x33\xcc\xd2\xe5\xd3\xbf" "\x37\xce\x7c\xab\xaa\x14\x67\xcf\xab\x53\x77\x6f\xbc\x74\xe0\x5f\x89\x7e" "\x26\x9e\x39\x3a\x13\x7f\x29\xae\x9b\x6c\x76\x1e\xdc\xdb\xb8\xbb\xfa\xce" "\x31\xb7\xf7\xbd\xaa\x2c\x32\xf0\x8b\xa9\xca\x44\x71\xbe\x5c\x2e\x0e\x56" "\xd9\x7a\xf8\xec\x28\xfa\x9e\x19\xdb\xb7\x5c\xf6\x5d\x19\xf4\xd5\x0f\xf5" "\x5d\x1d\xf4\x3d\xea\x4a\x6d\x54\xcf\x70\x87\x47\x6a\x95\x7d\xcf\x8d\xed" "\x6b\x97\x7d\xd7\x46\xfa\xc6\x3d\x6f\x01\x30\xf5\xe6\x7f\x30\xdf\x98\xfb" "\xef\xdc\x3f\xe7\x3e\x9c\xfb\xf3\xdc\xdd\xb9\xd7\x67\x5f\xbd\x70\xf3\xc2" "\x0b\x8d\x9c\xff\xc7\xf9\x9f\xcc\x2c\x9d\xfb\x6e\xfd\x85\xda\x5f\xf3\x61" "\xfe\x30\x7c\xff\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xbe\xb8\xcd\xf7\xde\xbf\xb7\xda" "\xe9\xac\x6d\xa8\xa8\xa8\xa8\x0c\x2a\x93\xbe\x33\x01\x5f\xb6\x1b\xdd\xfb" "\xef\xdc\xd8\x7c\xef\xfd\x1f\xae\xdf\x5f\x7d\x6b\xed\xad\xb5\x07\x3f\x6a" "\xb5\x5f\xba\xf5\xe3\xf6\xf2\xad\xe5\x1b\x77\xd6\x3b\x6b\x4b\xbd\xcf\x49" "\x87\x09\x00\x9c\xa2\xe1\x43\xff\xa4\x23\x01\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x3e\xcf\x59\xfc\x77\xe2\x49\xef\x23\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf0\xd5\xb6\xb2\x98\x99" "\xed\xd4\xb2\xbc\x74\x7d\xa9\x68\xef\xee\xb4\x3b\xc5\xd4\xaf\x0f\x97\x9c" "\x4d\x52\x2b\x2a\x7f\x4f\xf2\x69\xb2\x9d\xde\x94\xe6\xc8\x70\xb5\xcf\xdb" "\xce\x9b\x2f\x3f\xf5\xd1\x07\xcf\x7f\xf2\xca\x70\xac\xd9\xfe\xf2\xb5\xa3" "\xd6\x3b\x9e\x87\x62\xa9\x1f\x88\xe9\xa4\xe3\xb5\x4e\x3c\xde\x70\x0f\x17" "\x92\x5c\xae\x4a\x98\xb8\xcf\x02\x00\x00\xff\xff\x2a\xb4\x09\x9a", 1492); syz_mount_image(/*fs=*/0x20000600, /*dir=*/0x20000640, /*flags=*/0, /*opts=*/0x20000040, /*chdir=*/1, /*size=*/0x5d4, /*img=*/0x20000e00); syz_clone(/*flags=*/0x11, /*stack=*/0, /*stack_len=*/0, /*parentid=*/0, /*childtid=*/0, /*tls=*/0); } 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; use_temporary_dir(); loop(); return 0; }
Attachment:
repro.syz
Description: Binary data
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report
Description: Binary data
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kernel.log
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Attachment:
.config
Description: XML document
