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Date: Wed, 13 Mar 2019 06:51:02 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 202897] New: BUG: unable to handle kernel paging request at
__memmove
https://bugzilla.kernel.org/show_bug.cgi?id=202897
Bug ID: 202897
Summary: BUG: unable to handle kernel paging request at
__memmove
Product: File System
Version: 2.5
Kernel Version: 5.0-rc8
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@...nel-bugs.osdl.org
Reporter: jungyeon@...ech.edu
Regression: No
Created attachment 281787
--> https://bugzilla.kernel.org/attachment.cgi?id=281787&action=edit
The (compressed) crafted image which causes crash
- Overview
After mounting crafted image, I got this page fault while running attached
program.
- Produces
mkdir test
mount -t ext4 tmp.img test
gcc min_01.c
cp a.out test
cd test
./a.out
- Kernel messages
[ 74.327744] BUG: unable to handle kernel paging request at ffff95f12b296000
[ 74.329597] #PF error: [PROT] [WRITE]
[ 74.330547] PGD 23601067 P4D 23601067 PUD 2366b2063 PMD 23541d063 PTE
800000022b296061
[ 74.332538] Oops: 0003 [#1] SMP PTI
[ 74.333429] CPU: 0 PID: 1158 Comm: a.out Not tainted 5.0.0-rc8+ #9
[ 74.335059] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.10.2-1ubuntu1 04/01/2014
[ 74.337313] RIP: 0010:__memmove+0x81/0x1a0
[ 74.338359] Code: 4c 89 4f 10 4c 89 47 18 48 8d 7f 20 73 d4 48 83 c2 20 e9
a2 00 00 00 66 90 48 89 d1 4c 8b 5c 16 f8 4c 8d 54 17 f8 48 c1 e9 03 <f3> 48 a5
4d 89 1a e9 0c 01 00 00 0f 1f 40 00 48 89 d1 4c 8b 1e 49
[ 74.343035] RSP: 0018:ffffb09a011ef938 EFLAGS: 00010207
[ 74.344361] RAX: ffff95f12666a000 RBX: ffffb09a011efb40 RCX:
1fffffffff67a7fc
[ 74.346163] RDX: ffffffffffffffe4 RSI: ffff95f12b296000 RDI:
ffff95f12b296000
[ 74.347980] RBP: ffffb09a011efa38 R08: 0000000000000001 R09:
ffff95f1324acf00
[ 74.349763] R10: ffff95f126669fdc R11: 0000000000000000 R12:
ffffb09a011efab8
[ 74.351560] R13: ffff95f12666a000 R14: 00000000000003e4 R15:
0000000000000000
[ 74.353343] FS: 00007fa3b7981700(0000) GS:ffff95f137a00000(0000)
knlGS:0000000000000000
[ 74.355374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 74.356815] CR2: ffff95f12b296000 CR3: 000000022b2bc006 CR4:
00000000000206f0
[ 74.358622] Call Trace:
[ 74.359263] ? ext4_xattr_set_entry+0xa55/0x1090
[ 74.360447] ? jbd2_journal_cancel_revoke+0xbf/0xf0
[ 74.361696] ? kmem_cache_alloc+0xb0/0x170
[ 74.362761] ? jbd2_journal_get_write_access+0x5b/0x70
[ 74.364062] ext4_xattr_block_set+0x37a/0xf80
[ 74.365173] ? __getblk_gfp+0x2f/0x300
[ 74.366129] ? xattr_find_entry+0x8c/0x110
[ 74.367183] ext4_xattr_set_handle+0x544/0x5f0
[ 74.368315] __ext4_set_acl+0x1aa/0x290
[ 74.369293] ext4_set_acl+0xbf/0x1f0
[ 74.370210] ? posix_acl_from_xattr+0x180/0x180
[ 74.371373] set_posix_acl+0x79/0xb0
[ 74.372282] posix_acl_xattr_set+0x84/0x90
[ 74.373321] __vfs_removexattr+0x52/0x70
[ 74.374310] vfs_removexattr+0x84/0x100
[ 74.375293] removexattr+0x55/0x80
[ 74.376157] ? __check_object_size+0x17c/0x1b0
[ 74.377272] ? strncpy_from_user+0x50/0x1b0
[ 74.378323] ? _cond_resched+0x1a/0x50
[ 74.379292] ? __sb_start_write+0x3f/0x70
[ 74.380310] ? mnt_want_write+0x2c/0x50
[ 74.381284] path_removexattr+0x9a/0xb0
[ 74.382252] __x64_sys_removexattr+0x1b/0x20
[ 74.383357] do_syscall_64+0x5a/0x110
[ 74.384293] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 74.385568] RIP: 0033:0x7fa3b749c4d9
[ 74.386491] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 8b 0d 8f 29 2c 00 f7 d8 64 89 01 48
[ 74.391133] RSP: 002b:00007ffffd7aeb08 EFLAGS: 00000202 ORIG_RAX:
00000000000000c5
[ 74.393021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007fa3b749c4d9
[ 74.394822] RDX: 0000000000000000 RSI: 00007ffffd7aeb30 RDI:
00007ffffd7aeb20
[ 74.396608] RBP: 00007ffffd7aeb50 R08: 00007fa3b7775ab0 R09:
00007ffffd7aec38
[ 74.398392] R10: 00000000004006a0 R11: 0000000000000202 R12:
00000000004004a0
[ 74.400175] R13: 00007ffffd7aec30 R14: 0000000000000000 R15:
0000000000000000
[ 74.401951] Modules linked in:
[ 74.402744] CR2: ffff95f12b296000
[ 74.403596] ---[ end trace e7fe34a5ca4f4421 ]---
[ 74.404771] RIP: 0010:__memmove+0x81/0x1a0
[ 74.405815] Code: 4c 89 4f 10 4c 89 47 18 48 8d 7f 20 73 d4 48 83 c2 20 e9
a2 00 00 00 66 90 48 89 d1 4c 8b 5c 16 f8 4c 8d 54 17 f8 48 c1 e9 03 <f3> 48 a5
4d 89 1a e9 0c 01 00 00 0f 1f 40 00 48 89 d1 4c 8b 1e 49
[ 74.410512] RSP: 0018:ffffb09a011ef938 EFLAGS: 00010207
[ 74.411833] RAX: ffff95f12666a000 RBX: ffffb09a011efb40 RCX:
1fffffffff67a7fc
[ 74.413618] RDX: ffffffffffffffe4 RSI: ffff95f12b296000 RDI:
ffff95f12b296000
[ 74.415419] RBP: ffffb09a011efa38 R08: 0000000000000001 R09:
ffff95f1324acf00
[ 74.417211] R10: ffff95f126669fdc R11: 0000000000000000 R12:
ffffb09a011efab8
[ 74.419022] R13: ffff95f12666a000 R14: 00000000000003e4 R15:
0000000000000000
[ 74.420821] FS: 00007fa3b7981700(0000) GS:ffff95f137a00000(0000)
knlGS:0000000000000000
[ 74.422857] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 74.424306] CR2: ffff95f12b296000 CR3: 000000022b2bc006 CR4:
00000000000206f0
- Primitive reason
When calling memmove at 1704, it give extreme value as count (3rd parameter).
This is because val is smaller than first_val in this case, so that the count
becomes negative number. (-28 became -xfff....ffe4 because of two's compliment)
As a result, memmove show errors while copying with huge count number.
1696 /* No failures allowed past this point. */
1697
1698 if (!s->not_found && here->e_value_size && here->e_value_offs) {
1699 /* Remove the old value. */
1700 void *first_val = s->base + min_offs;
1701 size_t offs = le16_to_cpu(here->e_value_offs);
1702 void *val = s->base + offs;
1703
1704 memmove(first_val + old_size, first_val, val - first_val);
1705 memset(first_val, 0, old_size);
1706 min_offs += old_size;
1707
1708 /* Adjust all value offsets. */
1709 last = s->first;
1710 while (!IS_LAST_ENTRY(last)) {
1711 size_t o = le16_to_cpu(last->e_value_offs);
1712
1713 if (!last->e_value_inum &&
1714 last->e_value_size && o < offs)
1715 last->e_value_offs = cpu_to_le16(o + old_size);
1716 last = EXT4_XATTR_NEXT(last);
1717 }
1718 }
--
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