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boundary="===============3448206734446468615==" Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" --===============3448206734446468615== Content-Type: multipart/alternative; boundary="000000000000a8862b05b19ce107" --000000000000a8862b05b19ce107 Content-Type: text/plain; charset="UTF-8" FYI Gmail has a setting of making Replay All the default button. On Wed, Oct 14, 2020 at 9:39 AM Fox Chen wrote: > Hi, > > I found this bug was caused by either uid/gid info in superblocks or > id_index_table is corrupted. The uid/gid index is larger than the size of > msblk->id_table. > > Should I add a sanity check to squashfs_get_id?? > > > The complete solution is to record the size of msblk->id_table in msblk > and check uid/gid index each time in squashfs_get_id. However, this > requires a change to msblk struct. > > A simple solution is to calculate the max available room for uid/gid table > by doing msblk->xattr_table - msblk->id_table[0] and check if index is > larger than this. While this provides some sort of check, it is imperfect > because id_table can be smaller than that. > > Both of them work out for this bug. > > > thanks, > fox > > On Friday, September 25, 2020 at 10:48:18 PM UTC+8 syzbot wrote: > >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 171d4ff7 Merge tag 'mmc-v5.9-rc4-2' of git://git.kernel.or.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=1597ead3900000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=af502ec9a451c9fc >> dashboard link: >> https://syzkaller.appspot.com/bug?extid=8e28bba73ed1772a6802 >> compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ >> c2443155a0fb245c8f17f2c1c72b6ea391e86e81) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172ff481900000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c3e6c5900000 >> >> IMPORTANT: if you fix the issue, please add the following tag to the >> commit: >> Reported-by: syzbot+8e28bb...@syzkaller.appspotmail.com >> >> ================================================================== >> BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0xb9/0x1c0 >> fs/squashfs/id.c:38 >> Read of size 8 at addr ffff8880a9684b98 by task syz-executor329/6836 >> >> CPU: 1 PID: 6836 Comm: syz-executor329 Not tainted 5.9.0-rc6-syzkaller #0 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> Call Trace: >> __dump_stack lib/dump_stack.c:77 [inline] >> dump_stack+0x1d6/0x29e lib/dump_stack.c:118 >> print_address_description+0x66/0x620 mm/kasan/report.c:383 >> __kasan_report mm/kasan/report.c:513 [inline] >> kasan_report+0x132/0x1d0 mm/kasan/report.c:530 >> squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38 >> squashfs_new_inode fs/squashfs/inode.c:51 [inline] >> squashfs_read_inode+0x155/0x2170 fs/squashfs/inode.c:120 >> squashfs_fill_super+0x1478/0x1790 fs/squashfs/super.c:310 >> get_tree_bdev+0x3e9/0x5f0 fs/super.c:1342 >> vfs_get_tree+0x88/0x270 fs/super.c:1547 >> do_new_mount fs/namespace.c:2875 [inline] >> path_mount+0x179d/0x29e0 fs/namespace.c:3192 >> do_mount fs/namespace.c:3205 [inline] >> __do_sys_mount fs/namespace.c:3413 [inline] >> __se_sys_mount+0x126/0x180 fs/namespace.c:3390 >> do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 >> entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> RIP: 0033:0x446d1a >> Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e >> 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 >> ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00 >> RSP: 002b:00007ffd7dd4f8b8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 >> RAX: ffffffffffffffda RBX: 00007ffd7dd4f910 RCX: 0000000000446d1a >> RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd7dd4f8d0 >> RBP: 00007ffd7dd4f8d0 R08: 00007ffd7dd4f910 R09: 00007ffd00000015 >> R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 >> R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 >> >> Allocated by task 3913: >> kasan_save_stack mm/kasan/common.c:48 [inline] >> kasan_set_track mm/kasan/common.c:56 [inline] >> __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461 >> kmalloc_node include/linux/slab.h:577 [inline] >> __vmalloc_area_node mm/vmalloc.c:2429 [inline] >> __vmalloc_node_range+0x2c7/0x870 mm/vmalloc.c:2511 >> module_alloc+0x7e/0x90 arch/x86/kernel/module.c:75 >> bpf_jit_binary_alloc+0x123/0x230 kernel/bpf/core.c:871 >> bpf_int_jit_compile+0x7995/0x8920 arch/x86/net/bpf_jit_comp.c:1911 >> bpf_prog_select_runtime+0x76d/0xa60 kernel/bpf/core.c:1807 >> bpf_migrate_filter net/core/filter.c:1290 [inline] >> bpf_prepare_filter+0xec2/0x1140 net/core/filter.c:1338 >> bpf_prog_create_from_user+0x2ad/0x3e0 net/core/filter.c:1432 >> seccomp_prepare_filter kernel/seccomp.c:567 [inline] >> seccomp_prepare_user_filter kernel/seccomp.c:604 [inline] >> seccomp_set_mode_filter kernel/seccomp.c:1546 [inline] >> do_seccomp+0x852/0x20b0 kernel/seccomp.c:1661 >> do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 >> entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> >> The buggy address belongs to the object at ffff8880a9684b80 >> which belongs to the cache kmalloc-32 of size 32 >> The buggy address is located 24 bytes inside of >> 32-byte region [ffff8880a9684b80, ffff8880a9684ba0) >> The buggy address belongs to the page: >> page:00000000f697ca3d refcount:1 mapcount:0 mapping:0000000000000000 >> index:0xffff8880a9684fc1 pfn:0xa9684 >> flags: 0xfffe0000000200(slab) >> raw: 00fffe0000000200 ffffea0002a5d5c8 ffffea0002a98588 ffff8880aa440100 >> raw: ffff8880a9684fc1 ffff8880a9684000 000000010000003f 0000000000000000 >> page dumped because: kasan: bad access detected >> >> Memory state around the buggy address: >> ffff8880a9684a80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >> ffff8880a9684b00: 00 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc >> >ffff8880a9684b80: 00 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc >> ^ >> ffff8880a9684c00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >> ffff8880a9684c80: 00 00 01 fc fc fc fc fc fa fb fb fb fc fc fc fc >> ================================================================== >> >> >> --- >> This report is generated by a bot. It may contain errors. >> See https://goo.gl/tpsmEJ for more information about syzbot. >> syzbot engineers can be reached at syzk...@googlegroups.com. >> >> syzbot will keep track of this issue. See: >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >> syzbot can test patches for this issue, for details see: >> https://goo.gl/tpsmEJ#testing-patches >> > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/300c32a1-a0de-4f05-b467-0822b3d21733n%40googlegroups.com > > . > --000000000000a8862b05b19ce107 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
FYI Gmail has a setting of making Replay All the default b= utton.


On Wed, Oct 14, 2020 at 9:39 AM Fox Chen <foxhlchen@gmail.com> wrote:
Hi,=C2=A0

I found = this bug was caused by either uid/gid info in superblocks or id_index_table= is corrupted. The uid/gid index is larger than the size of msblk->id_ta= ble.

Should I add a sanity check to squashfs_g= et_id??=C2=A0


The complete solution= is to record the size of msblk->id_table=C2=A0in msblk and check uid/gi= d index each time in squashfs_get_id. However, this requires a change to ms= blk struct.

A simple solution is to calculate the = max available room for uid/gid table by doing msblk->xattr_table - msblk= ->id_table[0] and check if index is larger than this. While this provide= s some sort of check, it is imperfect because id_table can be smaller than = that.=C2=A0

Both of them work out for this bug.


thanks,
fox

<= /div>
On F= riday, September 25, 2020 at 10:48:18 PM UTC+8 syzbot wrote:
Hello,

syzbot found the following issue on:

HEAD commit: 171d4ff7 Merge tag 'mmc-v5.9-rc4-2' of git://gi= t.kernel.or..
git tree: upstream
console output: https://syzkaller.appspo= t.com/x/log.txt?x=3D1597ead3900000
kernel config: https://syzkaller.apps= pot.com/x/.config?x=3Daf502ec9a451c9fc
dashboard link: https://syzkaller.ap= pspot.com/bug?extid=3D8e28bba73ed1772a6802
compiler: clang version 10.0.0 (https://github.com/llvm= /llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.app= spot.com/x/repro.syz?x=3D172ff481900000
C reproducer: https://syzkaller.appspo= t.com/x/repro.c?x=3D17c3e6c5900000

IMPORTANT: if you fix the issue, please add the following tag to the co= mmit:
Reported-by: syzbot+8e28bb...@syzkaller.appspotmail= .com

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0xb9/0x1c0 fs/squashf= s/id.c:38
Read of size 8 at addr ffff8880a9684b98 by task syz-executor329/6836

CPU: 1 PID: 6836 Comm: syz-executor329 Not tainted 5.9.0-rc6-syzkaller = #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d6/0x29e lib/dump_stack.c:118
print_address_description+0x66/0x620 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report+0x132/0x1d0 mm/kasan/report.c:530
squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38
squashfs_new_inode fs/squashfs/inode.c:51 [inline]
squashfs_read_inode+0x155/0x2170 fs/squashfs/inode.c:120
squashfs_fill_super+0x1478/0x1790 fs/squashfs/super.c:310
get_tree_bdev+0x3e9/0x5f0 fs/super.c:1342
vfs_get_tree+0x88/0x270 fs/super.c:1547
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x179d/0x29e0 fs/namespace.c:3192
do_mount fs/namespace.c:3205 [inline]
__do_sys_mount fs/namespace.c:3413 [inline]
__se_sys_mount+0x126/0x180 fs/namespace.c:3390
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d1a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e= 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d = 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffd7dd4f8b8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd7dd4f910 RCX: 0000000000446d1a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd7dd4f8d0
RBP: 00007ffd7dd4f8d0 R08: 00007ffd7dd4f910 R09: 00007ffd00000015
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

Allocated by task 3913:
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
kmalloc_node include/linux/slab.h:577 [inline]
__vmalloc_area_node mm/vmalloc.c:2429 [inline]
__vmalloc_node_range+0x2c7/0x870 mm/vmalloc.c:2511
module_alloc+0x7e/0x90 arch/x86/kernel/module.c:75
bpf_jit_binary_alloc+0x123/0x230 kernel/bpf/core.c:871
bpf_int_jit_compile+0x7995/0x8920 arch/x86/net/bpf_jit_comp.c:1911
bpf_prog_select_runtime+0x76d/0xa60 kernel/bpf/core.c:1807
bpf_migrate_filter net/core/filter.c:1290 [inline]
bpf_prepare_filter+0xec2/0x1140 net/core/filter.c:1338
bpf_prog_create_from_user+0x2ad/0x3e0 net/core/filter.c:1432
seccomp_prepare_filter kernel/seccomp.c:567 [inline]
seccomp_prepare_user_filter kernel/seccomp.c:604 [inline]
seccomp_set_mode_filter kernel/seccomp.c:1546 [inline]
do_seccomp+0x852/0x20b0 kernel/seccomp.c:1661
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a9684b80
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes inside of
32-byte region [ffff8880a9684b80, ffff8880a9684ba0)
The buggy address belongs to the page:
page:00000000f697ca3d refcount:1 mapcount:0 mapping:0000000000000000 in= dex:0xffff8880a9684fc1 pfn:0xa9684
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002a5d5c8 ffffea0002a98588 ffff8880aa44010= 0
raw: ffff8880a9684fc1 ffff8880a9684000 000000010000003f 000000000000000= 0
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880a9684a80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff8880a9684b00: 00 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
>ffff8880a9684b80: 00 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff8880a9684c00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff8880a9684c80: 00 00 01 fc fc fc fc fc fa fb fb fb fc fc fc fc
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegr= oups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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